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automtn.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        automtn.cpp
// Purpose:     OLE automation utilities
// Author:      Julian Smart
// Modified by:
// Created:     11/6/98
// RCS-ID:      $Id: automtn.cpp,v 1.24.2.3 2003/01/03 14:57:33 JS Exp $
// Copyright:   (c) 1998, Julian Smart
// Licence:     wxWindows Licence
/////////////////////////////////////////////////////////////////////////////

#ifdef __GNUG__
#pragma implementation "automtn.h"
#endif

// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"

#if defined(__BORLANDC__)
#pragma hdrstop
#endif

#include "wx/defs.h"

// Watcom C++ gives a linker error if this is compiled in.
// With Borland C++, all samples crash if this is compiled in.
#if wxUSE_OLE &&!defined(__WATCOMC__) && !(defined(__BORLANDC__) && (__BORLANDC__ < 0x520)) && !defined(__CYGWIN10__) && !defined(__WXWINE__)

#include "wx/log.h"
#include "wx/msw/ole/automtn.h"
#include "wx/msw/private.h"

#include <math.h>
#include <time.h>

#include <wtypes.h>
#include <unknwn.h>
#include <ole2.h>
#define _huge
#include <ole2ver.h>
#include <oleauto.h>

// wrapper around BSTR type (by Vadim Zeitlin)

class WXDLLEXPORT BasicString
{
public:
  // ctors & dtor
  BasicString(const char *sz);
 ~BasicString();

  // accessors
    // just get the string
  operator BSTR() const { return m_wzBuf; }
    // retrieve a copy of our string - caller must SysFreeString() it later!
  BSTR Get() const { return SysAllocString(m_wzBuf); }

private:
  // @@@ not implemented (but should be)
  BasicString(const BasicString&);
  BasicString& operator=(const BasicString&);

  OLECHAR *m_wzBuf;     // actual string
};

// Convert variants
static bool ConvertVariantToOle(const wxVariant& variant, VARIANTARG& oleVariant) ;
static bool ConvertOleToVariant(const VARIANTARG& oleVariant, wxVariant& variant) ;

// Convert string to Unicode
static BSTR ConvertStringToOle(const wxString& str);

// Convert string from BSTR to wxString
static wxString ConvertStringFromOle(BSTR bStr);

// Verifies will fail if the needed buffer size is too large
#define MAX_TIME_BUFFER_SIZE    128         // matches that in timecore.cpp
#define MIN_DATE                (-657434L)  // about year 100
#define MAX_DATE                2958465L    // about year 9999

// Half a second, expressed in days
#define HALF_SECOND  (1.0/172800.0)

// One-based array of days in year at month start
static int rgMonthDays[13] =
      {0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365};

#if wxUSE_TIMEDATE
static BOOL OleDateFromTm(WORD wYear, WORD wMonth, WORD wDay,
      WORD wHour, WORD wMinute, WORD wSecond, DATE& dtDest);
static BOOL TmFromOleDate(DATE dtSrc, struct tm& tmDest);
#endif // wxUSE_TIMEDATE

static void ClearVariant(VARIANTARG *pvarg) ;
static void ReleaseVariant(VARIANTARG *pvarg) ;
// static void ShowException(LPOLESTR szMember, HRESULT hr, EXCEPINFO *pexcep, unsigned int uiArgErr);

/*
 * wxAutomationObject
 */

wxAutomationObject::wxAutomationObject(WXIDISPATCH* dispatchPtr)
{
      m_dispatchPtr = dispatchPtr;
}

wxAutomationObject::~wxAutomationObject()
{
      if (m_dispatchPtr)
      {
            ((IDispatch*)m_dispatchPtr)->Release();
            m_dispatchPtr = NULL;
      }
}

#define INVOKEARG(i) (args ? args[i] : *(ptrArgs[i]))

// For Put/Get, no named arguments are allowed.
bool wxAutomationObject::Invoke(const wxString& member, int action,
        wxVariant& retValue, int noArgs, wxVariant args[], const wxVariant* ptrArgs[]) const
{
      if (!m_dispatchPtr)
            return FALSE;

      // nonConstMember is necessary because the wxString class doesn't have enough consts...
      wxString nonConstMember(member);

      int ch = nonConstMember.Find('.');
      if (ch != -1)
      {
            // Use dot notation to get the next object
            wxString member2(nonConstMember.Left((size_t) ch));
            wxString rest(nonConstMember.Right(nonConstMember.Length() - ch - 1));
            wxAutomationObject obj;
            if (!GetObject(obj, member2))
                  return FALSE;
            return obj.Invoke(rest, action, retValue, noArgs, args, ptrArgs);
      }

      VARIANTARG vReturn;
      ClearVariant(& vReturn);

      VARIANTARG* vReturnPtr = & vReturn;

      // Find number of names args
      int namedArgCount = 0;
      int i;
      for (i = 0; i < noArgs; i++)
            if (!INVOKEARG(i).GetName().IsNull())
            {
                  namedArgCount ++;
            }

      int namedArgStringCount = namedArgCount + 1;
      BSTR* argNames = new BSTR[namedArgStringCount];
      argNames[0] = ConvertStringToOle(member);

      // Note that arguments are specified in reverse order
      // (all totally logical; hey, we're dealing with OLE here.)

      int j = 0;
      for (i = 0; i < namedArgCount; i++)
      {     
            if (!INVOKEARG(i).GetName().IsNull())
            {
                  argNames[(namedArgCount-j)] = ConvertStringToOle(INVOKEARG(i).GetName());
                  j ++;
            }
      }

      // + 1 for the member name, + 1 again in case we're a 'put'
      DISPID* dispIds = new DISPID[namedArgCount + 2];

      HRESULT hr;
      DISPPARAMS dispparams;
      unsigned int uiArgErr;
      EXCEPINFO excep;
      
      // Get the IDs for the member and its arguments.  GetIDsOfNames expects the
      // member name as the first name, followed by argument names (if any).
      hr = ((IDispatch*)m_dispatchPtr)->GetIDsOfNames(IID_NULL, argNames,
                                                1 + namedArgCount, LOCALE_SYSTEM_DEFAULT, dispIds);
      if (FAILED(hr)) 
      {
//          ShowException(szMember, hr, NULL, 0);
        delete[] argNames;
        delete[] dispIds;
            return FALSE;
      }

      // if doing a property put(ref), we need to adjust the first argument to have a
      // named arg of DISPID_PROPERTYPUT.
      if (action & (DISPATCH_PROPERTYPUT | DISPATCH_PROPERTYPUTREF))
      {
            namedArgCount = 1;
            dispIds[1] = DISPID_PROPERTYPUT;
            vReturnPtr = (VARIANTARG*) NULL;
      }

      // Convert the wxVariants to VARIANTARGs
      VARIANTARG* oleArgs = new VARIANTARG[noArgs];
      for (i = 0; i < noArgs; i++)
      {
            // Again, reverse args
            if (!ConvertVariantToOle(INVOKEARG((noArgs-1) - i), oleArgs[i]))
        {
              delete[] argNames;
              delete[] dispIds;
            delete[] oleArgs;
                  return FALSE;
        }
      }

      dispparams.rgdispidNamedArgs = dispIds + 1;
      dispparams.rgvarg = oleArgs;
      dispparams.cArgs = noArgs;
      dispparams.cNamedArgs = namedArgCount;
      
      excep.pfnDeferredFillIn = NULL;
      
      hr = ((IDispatch*)m_dispatchPtr)->Invoke(dispIds[0], IID_NULL, LOCALE_SYSTEM_DEFAULT,
                                    action, &dispparams, vReturnPtr, &excep, &uiArgErr);

      for (i = 0; i < namedArgStringCount; i++)
      {
            SysFreeString(argNames[i]);
      }
      delete[] argNames;
      delete[] dispIds;
      
      for (i = 0; i < noArgs; i++)
            ReleaseVariant(& oleArgs[i]) ;
      delete[] oleArgs;
      
      if (FAILED(hr)) 
      {
            // display the exception information if appropriate:
//          ShowException((const char*) member, hr, &excep, uiArgErr);
      
            // free exception structure information
            SysFreeString(excep.bstrSource);
            SysFreeString(excep.bstrDescription);
            SysFreeString(excep.bstrHelpFile);

            if (vReturnPtr)
                  ReleaseVariant(vReturnPtr);
            return FALSE;
      }
      else
      {
            if (vReturnPtr)
            {
                  // Convert result to wxVariant form
                  ConvertOleToVariant(vReturn, retValue);
                  // Mustn't release the dispatch pointer
                  if (vReturn.vt == VT_DISPATCH)
                  {
                        vReturn.pdispVal = (IDispatch*) NULL;
                  }
                  ReleaseVariant(& vReturn);
            }
      }
      return TRUE;
}

// Invoke a member function
wxVariant wxAutomationObject::CallMethod(const wxString& member, int noArgs, wxVariant args[])
{
      wxVariant retVariant;
      if (!Invoke(member, DISPATCH_METHOD, retVariant, noArgs, args))
      {
            retVariant.MakeNull();
      }
      return retVariant;
}

wxVariant wxAutomationObject::CallMethodArray(const wxString& member, int noArgs, const wxVariant **args)
{
      wxVariant retVariant;
      if (!Invoke(member, DISPATCH_METHOD, retVariant, noArgs, NULL, args))
      {
            retVariant.MakeNull();
      }
      return retVariant;
}

wxVariant wxAutomationObject::CallMethod(const wxString& member,
            const wxVariant& arg1, const wxVariant& arg2,
            const wxVariant& arg3, const wxVariant& arg4,
            const wxVariant& arg5, const wxVariant& arg6)
{
      const wxVariant** args = new const wxVariant*[6];
      int i = 0;
      if (!arg1.IsNull())
      {
            args[i] = & arg1;
            i ++;
      }
      if (!arg2.IsNull())
      {
            args[i] = & arg2;
            i ++;
      }
      if (!arg3.IsNull())
      {
            args[i] = & arg3;
            i ++;
      }
      if (!arg4.IsNull())
      {
            args[i] = & arg4;
            i ++;
      }
      if (!arg5.IsNull())
      {
            args[i] = & arg5;
            i ++;
      }
      if (!arg6.IsNull())
      {
            args[i] = & arg6;
            i ++;
      }
      wxVariant retVariant;
      if (!Invoke(member, DISPATCH_METHOD, retVariant, i, NULL, args))
      {
            retVariant.MakeNull();
      }
      delete[] args;
      return retVariant;
}

// Get/Set property
wxVariant wxAutomationObject::GetPropertyArray(const wxString& property, int noArgs, const wxVariant **args) const
{
      wxVariant retVariant;
      if (!Invoke(property, DISPATCH_PROPERTYGET, retVariant, noArgs, NULL, args))
      {
            retVariant.MakeNull();
      }
      return retVariant;
}
wxVariant wxAutomationObject::GetProperty(const wxString& property, int noArgs, wxVariant args[]) const
{
      wxVariant retVariant;
      if (!Invoke(property, DISPATCH_PROPERTYGET, retVariant, noArgs, args))
      {
            retVariant.MakeNull();
      }
      return retVariant;
}

wxVariant wxAutomationObject::GetProperty(const wxString& property,
            const wxVariant& arg1, const wxVariant& arg2,
            const wxVariant& arg3, const wxVariant& arg4,
            const wxVariant& arg5, const wxVariant& arg6)
{
      const wxVariant** args = new const wxVariant*[6];
      int i = 0;
      if (!arg1.IsNull())
      {
            args[i] = & arg1;
            i ++;
      }
      if (!arg2.IsNull())
      {
            args[i] = & arg2;
            i ++;
      }
      if (!arg3.IsNull())
      {
            args[i] = & arg3;
            i ++;
      }
      if (!arg4.IsNull())
      {
            args[i] = & arg4;
            i ++;
      }
      if (!arg5.IsNull())
      {
            args[i] = & arg5;
            i ++;
      }
      if (!arg6.IsNull())
      {
            args[i] = & arg6;
            i ++;
      }
      wxVariant retVariant;
      if (!Invoke(property, DISPATCH_PROPERTYGET, retVariant, i, NULL, args))
      {
            retVariant.MakeNull();
      }
      delete[] args;
      return retVariant;
}

bool wxAutomationObject::PutProperty(const wxString& property, int noArgs, wxVariant args[])
{
      wxVariant retVariant;
      if (!Invoke(property, DISPATCH_PROPERTYPUT, retVariant, noArgs, args))
      {
            return FALSE;
      }
      return TRUE;
}

bool wxAutomationObject::PutPropertyArray(const wxString& property, int noArgs, const wxVariant **args)
{
      wxVariant retVariant;
      if (!Invoke(property, DISPATCH_PROPERTYPUT, retVariant, noArgs, NULL, args))
      {
            return FALSE;
      }
      return TRUE;
}

bool wxAutomationObject::PutProperty(const wxString& property,
            const wxVariant& arg1, const wxVariant& arg2,
            const wxVariant& arg3, const wxVariant& arg4,
            const wxVariant& arg5, const wxVariant& arg6)
{
      const wxVariant** args = new const wxVariant*[6];
      int i = 0;
      if (!arg1.IsNull())
      {
            args[i] = & arg1;
            i ++;
      }
      if (!arg2.IsNull())
      {
            args[i] = & arg2;
            i ++;
      }
      if (!arg3.IsNull())
      {
            args[i] = & arg3;
            i ++;
      }
      if (!arg4.IsNull())
      {
            args[i] = & arg4;
            i ++;
      }
      if (!arg5.IsNull())
      {
            args[i] = & arg5;
            i ++;
      }
      if (!arg6.IsNull())
      {
            args[i] = & arg6;
            i ++;
      }
      wxVariant retVariant;
      bool ret = Invoke(property, DISPATCH_PROPERTYPUT, retVariant, i, NULL, args);
      delete[] args;
      return ret;
}


// Uses DISPATCH_PROPERTYGET
// and returns a dispatch pointer. The calling code should call Release
// on the pointer, though this could be implicit by constructing an wxAutomationObject
// with it and letting the destructor call Release.
WXIDISPATCH* wxAutomationObject::GetDispatchProperty(const wxString& property, int noArgs, wxVariant args[]) const
{
      wxVariant retVariant;
      if (Invoke(property, DISPATCH_PROPERTYGET, retVariant, noArgs, args))
      {
            if (retVariant.GetType() == wxT("void*"))
            {
                  return (WXIDISPATCH*) retVariant.GetVoidPtr();
            }
      }

      return (WXIDISPATCH*) NULL;
}

// Uses DISPATCH_PROPERTYGET
// and returns a dispatch pointer. The calling code should call Release
// on the pointer, though this could be implicit by constructing an wxAutomationObject
// with it and letting the destructor call Release.
WXIDISPATCH* wxAutomationObject::GetDispatchProperty(const wxString& property, int noArgs, const wxVariant **args) const
{
      wxVariant retVariant;
      if (Invoke(property, DISPATCH_PROPERTYGET, retVariant, noArgs, NULL, args))
      {
            if (retVariant.GetType() == wxT("void*"))
            {
                  return (WXIDISPATCH*) retVariant.GetVoidPtr();
            }
      }

      return (WXIDISPATCH*) NULL;
}


// A way of initialising another wxAutomationObject with a dispatch object
bool wxAutomationObject::GetObject(wxAutomationObject& obj, const wxString& property, int noArgs, wxVariant args[]) const
{
      WXIDISPATCH* dispatch = GetDispatchProperty(property, noArgs, args);
      if (dispatch)
      {
            obj.SetDispatchPtr(dispatch);
            return TRUE;
      }
      else
            return FALSE;
}

// A way of initialising another wxAutomationObject with a dispatch object
bool wxAutomationObject::GetObject(wxAutomationObject& obj, const wxString& property, int noArgs, const wxVariant **args) const
{
      WXIDISPATCH* dispatch = GetDispatchProperty(property, noArgs, args);
      if (dispatch)
      {
            obj.SetDispatchPtr(dispatch);
            return TRUE;
      }
      else
            return FALSE;
}

// Get a dispatch pointer from the current object associated
// with a class id
bool wxAutomationObject::GetInstance(const wxString& classId) const
{
      if (m_dispatchPtr)
            return FALSE;

      CLSID clsId;
      IUnknown * pUnk = NULL;

      BasicString unicodeName(classId.mb_str());
      
      if (FAILED(CLSIDFromProgID((BSTR) unicodeName, &clsId))) 
      {
            wxLogWarning(wxT("Cannot obtain CLSID from ProgID"));
            return FALSE;
      }

      if (FAILED(GetActiveObject(clsId, NULL, &pUnk)))
      {
            wxLogWarning(wxT("Cannot find an active object"));
            return FALSE;
      }
      
      if (pUnk->QueryInterface(IID_IDispatch, (LPVOID*) &m_dispatchPtr) != S_OK)
      {
            wxLogWarning(wxT("Cannot find IDispatch interface"));
            return FALSE;
      }

      return TRUE;
}

// Get a dispatch pointer from a new object associated
// with the given class id
bool wxAutomationObject::CreateInstance(const wxString& classId) const
{
      if (m_dispatchPtr)
            return FALSE;

      CLSID clsId;

      BasicString unicodeName(classId.mb_str());
      
      if (FAILED(CLSIDFromProgID((BSTR) unicodeName, &clsId))) 
      {
            wxLogWarning(wxT("Cannot obtain CLSID from ProgID"));
            return FALSE;
      }

      // start a new copy of Excel, grab the IDispatch interface
      if (FAILED(CoCreateInstance(clsId, NULL, CLSCTX_LOCAL_SERVER, IID_IDispatch, (void**)&m_dispatchPtr))) 
      {
            wxLogWarning(wxT("Cannot start an instance of this class."));
            return FALSE;
      }
      
      return TRUE;
}


bool ConvertVariantToOle(const wxVariant& variant, VARIANTARG& oleVariant)
{
      ClearVariant(&oleVariant);
      if (variant.IsNull())
      {
            oleVariant.vt = VT_NULL;
            return TRUE;
      }

    wxString type(variant.GetType());


    if (type == wxT("long"))
    {
        oleVariant.vt = VT_I4;
        oleVariant.lVal = variant.GetLong() ;
    }
    // cVal not always present
#ifndef __GNUWIN32__
    else if (type == wxT("char"))
    {
        oleVariant.vt=VT_I1;              // Signed Char
        oleVariant.cVal=variant.GetChar();
    }
#endif
    else if (type == wxT("double"))
    {
        oleVariant.vt = VT_R8;
        oleVariant.dblVal = variant.GetDouble();
    }
    else if (type == wxT("bool"))
    {
        oleVariant.vt = VT_BOOL;
        // 'bool' required for VC++ 4 apparently
#if defined(__WATCOMC__) || (defined(__VISUALC__) && (__VISUALC__ <= 1000))
        oleVariant.bool = variant.GetBool();
#else
        oleVariant.boolVal = variant.GetBool();
#endif
    }
    else if (type == wxT("string"))
    {
        wxString str( variant.GetString() );
        oleVariant.vt = VT_BSTR;
        oleVariant.bstrVal = ConvertStringToOle(str);
    }
// For some reason, Watcom C++ can't link variant.cpp with time/date classes compiled
#if wxUSE_TIMEDATE && !defined(__WATCOMC__)
    else if (type == wxT("date"))
    {
        wxDate date( variant.GetDate() );
        oleVariant.vt = VT_DATE;

            if (!OleDateFromTm(date.GetYear(), date.GetMonth(), date.GetDay(),
                        0, 0, 0, oleVariant.date))
                  return FALSE;
    }
    else if (type == wxT("time"))
    {
        wxTime time( variant.GetTime() );
        oleVariant.vt = VT_DATE;

            if (!OleDateFromTm(time.GetYear(), time.GetMonth(), time.GetDay(),
                  time.GetHour(), time.GetMinute(), time.GetSecond(), oleVariant.date))
                  return FALSE;
    }
#endif
    else if (type == wxT("void*"))
    {
        oleVariant.vt = VT_DISPATCH;
        oleVariant.pdispVal = (IDispatch*) variant.GetVoidPtr();
    }
    else if (type == wxT("list") || type == wxT("stringlist"))
    {
        oleVariant.vt = VT_VARIANT | VT_ARRAY;

          SAFEARRAY *psa;
          SAFEARRAYBOUND saBound;
          VARIANTARG *pvargBase;
          VARIANTARG *pvarg;
          int i, j;

        int iCount = variant.GetCount();
      
          saBound.lLbound = 0;
          saBound.cElements = iCount;
      
          psa = SafeArrayCreate(VT_VARIANT, 1, &saBound);
          if (psa == NULL)
                return FALSE;
      
          SafeArrayAccessData(psa, (void**)&pvargBase);
      
          pvarg = pvargBase;
          for (i = 0; i < iCount; i++)
          {
                // copy each string in the list of strings
            wxVariant eachVariant(variant[i]);
            if (!ConvertVariantToOle(eachVariant, * pvarg))
            {
                      // memory failure:  back out and free strings alloc'ed up to
                      // now, and then the array itself.
                      pvarg = pvargBase;
                      for (j = 0; j < i; j++)
                      {
                            SysFreeString(pvarg->bstrVal);
                            pvarg++;
                      }
                      SafeArrayDestroy(psa);
                      return FALSE;
                }
                pvarg++;
          }
      
          SafeArrayUnaccessData(psa);

        oleVariant.parray = psa;
    }
    else
    {
        oleVariant.vt = VT_NULL;
        return FALSE;
    }
    return TRUE;
}

#ifndef VT_TYPEMASK
#define VT_TYPEMASK 0xfff
#endif

bool ConvertOleToVariant(const VARIANTARG& oleVariant, wxVariant& variant)
{
      switch (oleVariant.vt & VT_TYPEMASK)
      {
      case VT_BSTR:
            {
                  wxString str(ConvertStringFromOle(oleVariant.bstrVal));
                  variant = str;
                  break;
            }
      case VT_DATE:
            {
#if wxUSE_TIMEDATE
            struct tm tmTemp;
                  if (!TmFromOleDate(oleVariant.date, tmTemp))
                        return FALSE;

                  wxDate date(tmTemp.tm_yday, tmTemp.tm_mon, tmTemp.tm_year);
                  wxTime time(date, tmTemp.tm_hour, tmTemp.tm_min, tmTemp.tm_sec);

                  variant = time;
#endif

            break;
            }
      case VT_I4:
            {
                  variant = (long) oleVariant.lVal;
                  break;
            }
      case VT_I2:
            {
                  variant = (long) oleVariant.iVal;
                  break;
            }

      case VT_BOOL:
            {
#if defined(__WATCOMC__) || (defined(_MSC_VER) && (_MSC_VER <= 1000) && !defined(__MWERKS__) ) //GC
#ifndef HAVE_BOOL // Can't use bool operator if no native bool type
                  variant = (long) (oleVariant.bool != 0);
#else
                  variant = (bool) (oleVariant.bool != 0);
#endif
#else
#ifndef HAVE_BOOL // Can't use bool operator if no native bool type
                  variant = (long) (oleVariant.boolVal != 0);
#else
                  variant = (bool) (oleVariant.boolVal != 0);
#endif
#endif
                  break;
            }
      case VT_R8:
            {
                  variant = oleVariant.dblVal;
                  break;
            }
      case VT_ARRAY:
            {
                  variant.ClearList();

                  int cDims, cElements, i;
                  VARIANTARG* pvdata;

                  // Iterate the dimensions: number of elements is x*y*z
                  for (cDims = 0, cElements = 1;
                        cDims < oleVariant.parray->cDims; cDims ++)
                              cElements *= oleVariant.parray->rgsabound[cDims].cElements;

                  // Get a pointer to the data
                  HRESULT hr = SafeArrayAccessData(oleVariant.parray, (void HUGEP* FAR*) & pvdata);
                  if (hr != NOERROR)
                        return FALSE;
                  // Iterate the data.
                  for (i = 0; i < cElements; i++)
                  {
                        VARIANTARG& oleElement = pvdata[i];
                        wxVariant vElement;
                        if (!ConvertOleToVariant(oleElement, vElement))
                              return FALSE;
                        
                        variant.Append(vElement);
                  }
                  SafeArrayUnaccessData(oleVariant.parray);
                  break;
            }
      case VT_DISPATCH:
            {
                  variant = (void*) oleVariant.pdispVal;
                  break;
            }
      case VT_NULL:
            {
                  variant.MakeNull();
                  break;
            }
      case VT_EMPTY:
            {
                  break;      // Ignore Empty Variant, used only during destruction of objects
            }
      default:
            {
                  wxLogError(wxT("wxAutomationObject::ConvertOleToVariant: Unknown variant value type"));
                  return FALSE;
            }
      }
    return TRUE;
}

static BSTR ConvertStringToOle(const wxString& str)
{
/*
      unsigned int len = strlen((const char*) str);
      unsigned short* s = new unsigned short[len*2+2];
      unsigned int i;
      memset(s, 0, len*2+2);
      for (i=0; i < len; i++)
            s[i*2] = str[i];
*/
      BasicString bstr(str.mb_str());
      return bstr.Get();
}

static wxString ConvertStringFromOle(BSTR bStr)
{
#if wxUSE_UNICODE
    wxString str(bStr);
#else
      int len = SysStringLen(bStr) + 1;
      char    *buf = new char[len];
      (void)wcstombs( buf, bStr, len);
      wxString str(buf); 
      delete[] buf;
#endif
      return str;
}

// ----------------------------------------------------------------------------
// BasicString
// ----------------------------------------------------------------------------

// ctor takes an ANSI string and transforms it to Unicode
BasicString::BasicString(const char *sz)
{
  // get the size of required buffer
  UINT lenAnsi = strlen(sz);
  #ifdef __MWERKS__
  UINT lenWide = lenAnsi * 2 ;
  #else
  UINT lenWide = mbstowcs(NULL, sz, lenAnsi);
  #endif

  if ( lenWide > 0 ) {
    m_wzBuf = new OLECHAR[lenWide + 1];
    mbstowcs(m_wzBuf, sz, lenAnsi);
    m_wzBuf[lenWide] = L'\0';
  }
  else {
    m_wzBuf = NULL;
  }
}

// dtor frees memory
BasicString::~BasicString()
{
  delete [] m_wzBuf;
}

/////////////////////////////////////////////////////////////////////////////
// COleDateTime class HELPERS - implementation

BOOL OleDateFromTm(WORD wYear, WORD wMonth, WORD wDay,
      WORD wHour, WORD wMinute, WORD wSecond, DATE& dtDest)
{
      // Validate year and month (ignore day of week and milliseconds)
      if (wYear > 9999 || wMonth < 1 || wMonth > 12)
            return FALSE;

      //  Check for leap year and set the number of days in the month
      BOOL bLeapYear = ((wYear & 3) == 0) &&
            ((wYear % 100) != 0 || (wYear % 400) == 0);

      int nDaysInMonth =
            rgMonthDays[wMonth] - rgMonthDays[wMonth-1] +
            ((bLeapYear && wDay == 29 && wMonth == 2) ? 1 : 0);

      // Finish validating the date
      if (wDay < 1 || wDay > nDaysInMonth ||
            wHour > 23 || wMinute > 59 ||
            wSecond > 59)
      {
            return FALSE;
      }

      // Cache the date in days and time in fractional days
      long nDate;
      double dblTime;

      //It is a valid date; make Jan 1, 1AD be 1
      nDate = wYear*365L + wYear/4 - wYear/100 + wYear/400 +
            rgMonthDays[wMonth-1] + wDay;

      //  If leap year and it's before March, subtract 1:
      if (wMonth <= 2 && bLeapYear)
            --nDate;

      //  Offset so that 12/30/1899 is 0
      nDate -= 693959L;

      dblTime = (((long)wHour * 3600L) +  // hrs in seconds
            ((long)wMinute * 60L) +  // mins in seconds
            ((long)wSecond)) / 86400.;

      dtDest = (double) nDate + ((nDate >= 0) ? dblTime : -dblTime);

      return TRUE;
}

BOOL TmFromOleDate(DATE dtSrc, struct tm& tmDest)
{
      // The legal range does not actually span year 0 to 9999.
      if (dtSrc > MAX_DATE || dtSrc < MIN_DATE) // about year 100 to about 9999
            return FALSE;

      long nDays;             // Number of days since Dec. 30, 1899
      long nDaysAbsolute;     // Number of days since 1/1/0
      long nSecsInDay;        // Time in seconds since midnight
      long nMinutesInDay;     // Minutes in day

      long n400Years;         // Number of 400 year increments since 1/1/0
      long n400Century;       // Century within 400 year block (0,1,2 or 3)
      long n4Years;           // Number of 4 year increments since 1/1/0
      long n4Day;             // Day within 4 year block
                                          //  (0 is 1/1/yr1, 1460 is 12/31/yr4)
      long n4Yr;              // Year within 4 year block (0,1,2 or 3)
      BOOL bLeap4 = TRUE;     // TRUE if 4 year block includes leap year

      double dblDate = dtSrc; // tempory serial date

      // If a valid date, then this conversion should not overflow
      nDays = (long)dblDate;

      // Round to the second
      dblDate += ((dtSrc > 0.0) ? HALF_SECOND : -HALF_SECOND);

      nDaysAbsolute = (long)dblDate + 693959L; // Add days from 1/1/0 to 12/30/1899

      dblDate = fabs(dblDate);
      nSecsInDay = (long)((dblDate - floor(dblDate)) * 86400.);

      // Calculate the day of week (sun=1, mon=2...)
      //   -1 because 1/1/0 is Sat.  +1 because we want 1-based
      tmDest.tm_wday = (int)((nDaysAbsolute - 1) % 7L) + 1;

      // Leap years every 4 yrs except centuries not multiples of 400.
      n400Years = (long)(nDaysAbsolute / 146097L);

      // Set nDaysAbsolute to day within 400-year block
      nDaysAbsolute %= 146097L;

      // -1 because first century has extra day
      n400Century = (long)((nDaysAbsolute - 1) / 36524L);

      // Non-leap century
      if (n400Century != 0)
      {
            // Set nDaysAbsolute to day within century
            nDaysAbsolute = (nDaysAbsolute - 1) % 36524L;

            // +1 because 1st 4 year increment has 1460 days
            n4Years = (long)((nDaysAbsolute + 1) / 1461L);

            if (n4Years != 0)
                  n4Day = (long)((nDaysAbsolute + 1) % 1461L);
            else
            {
                  bLeap4 = FALSE;
                  n4Day = (long)nDaysAbsolute;
            }
      }
      else
      {
            // Leap century - not special case!
            n4Years = (long)(nDaysAbsolute / 1461L);
            n4Day = (long)(nDaysAbsolute % 1461L);
      }

      if (bLeap4)
      {
            // -1 because first year has 366 days
            n4Yr = (n4Day - 1) / 365;

            if (n4Yr != 0)
                  n4Day = (n4Day - 1) % 365;
      }
      else
      {
            n4Yr = n4Day / 365;
            n4Day %= 365;
      }

      // n4Day is now 0-based day of year. Save 1-based day of year, year number
      tmDest.tm_yday = (int)n4Day + 1;
      tmDest.tm_year = n400Years * 400 + n400Century * 100 + n4Years * 4 + n4Yr;

      // Handle leap year: before, on, and after Feb. 29.
      if (n4Yr == 0 && bLeap4)
      {
            // Leap Year
            if (n4Day == 59)
            {
                  /* Feb. 29 */
                  tmDest.tm_mon = 2;
                  tmDest.tm_mday = 29;
                  goto DoTime;
            }

            // Pretend it's not a leap year for month/day comp.
            if (n4Day >= 60)
                  --n4Day;
      }

      // Make n4DaY a 1-based day of non-leap year and compute
      //  month/day for everything but Feb. 29.
      ++n4Day;

      // Month number always >= n/32, so save some loop time */
      for (tmDest.tm_mon = (n4Day >> 5) + 1;
            n4Day > rgMonthDays[tmDest.tm_mon]; tmDest.tm_mon++);

      tmDest.tm_mday = (int)(n4Day - rgMonthDays[tmDest.tm_mon-1]);

DoTime:
      if (nSecsInDay == 0)
            tmDest.tm_hour = tmDest.tm_min = tmDest.tm_sec = 0;
      else
      {
            tmDest.tm_sec = (int)nSecsInDay % 60L;
            nMinutesInDay = nSecsInDay / 60L;
            tmDest.tm_min = (int)nMinutesInDay % 60;
            tmDest.tm_hour = (int)nMinutesInDay / 60;
      }

      return TRUE;
}

// this function is not used
#if 0
void TmConvertToStandardFormat(struct tm& tmSrc)
{
      // Convert afx internal tm to format expected by runtimes (_tcsftime, etc)
      tmSrc.tm_year -= 1900;  // year is based on 1900
      tmSrc.tm_mon -= 1;      // month of year is 0-based
      tmSrc.tm_wday -= 1;     // day of week is 0-based
      tmSrc.tm_yday -= 1;     // day of year is 0-based
}

double DoubleFromDate(DATE dt)
{
      // No problem if positive
      if (dt >= 0)
            return dt;

      // If negative, must convert since negative dates not continuous
      // (examples: -1.25 to -.75, -1.50 to -.50, -1.75 to -.25)
      double temp = ceil(dt);
      return temp - (dt - temp);
}

DATE DateFromDouble(double dbl)
{
      // No problem if positive
      if (dbl >= 0)
            return dbl;

      // If negative, must convert since negative dates not continuous
      // (examples: -.75 to -1.25, -.50 to -1.50, -.25 to -1.75)
      double temp = floor(dbl); // dbl is now whole part
      return temp + (temp - dbl);
}
#endif // 0

/*
 *  ClearVariant
 *
 *  Zeros a variant structure without regard to current contents
 */
static void ClearVariant(VARIANTARG *pvarg)
{
      pvarg->vt = VT_EMPTY;
      pvarg->wReserved1 = 0;
      pvarg->wReserved2 = 0;
      pvarg->wReserved3 = 0;
      pvarg->lVal = 0;
}

/*
 *  ReleaseVariant
 *
 *  Clears a particular variant structure and releases any external objects
 *  or memory contained in the variant.  Supports the data types listed above.
 */
static void ReleaseVariant(VARIANTARG *pvarg)
{
      VARTYPE vt;
      VARIANTARG _huge *pvargArray;
      long lLBound, lUBound, l;
      
      vt = pvarg->vt & 0xfff;       // mask off flags
      
      // check if an array.  If so, free its contents, then the array itself.
      if (V_ISARRAY(pvarg)) 
      {
            // variant arrays are all this routine currently knows about.  Since a
            // variant can contain anything (even other arrays), call ourselves
            // recursively.
            if (vt == VT_VARIANT) 
            {
                  SafeArrayGetLBound(pvarg->parray, 1, &lLBound);
                  SafeArrayGetUBound(pvarg->parray, 1, &lUBound);
                  
                  if (lUBound > lLBound) 
                  {
                        lUBound -= lLBound;
                        
                        SafeArrayAccessData(pvarg->parray, (void**)&pvargArray);
                        
                        for (l = 0; l < lUBound; l++) 
                        {
                              ReleaseVariant(pvargArray);
                              pvargArray++;
                        }
                        
                        SafeArrayUnaccessData(pvarg->parray);
                  }
            }
            else 
            {
                  wxLogWarning(wxT("ReleaseVariant: Array contains non-variant type"));
            }
            
            // Free the array itself.
            SafeArrayDestroy(pvarg->parray);
      }
      else 
      {
            switch (vt) 
            {
                  case VT_DISPATCH:
                        if (pvarg->pdispVal)
                              pvarg->pdispVal->Release();
                        break;
                        
                  case VT_BSTR:
                        SysFreeString(pvarg->bstrVal);
                        break;
                        
                  case VT_I2:
                  case VT_BOOL:
                  case VT_R8:
                  case VT_ERROR:          // to avoid erroring on an error return from Excel
                        // no work for these types
                        break;
                        
                  default:
                        wxLogWarning(wxT("ReleaseVariant: Unknown type"));
                        break;
            }
      }
      
      ClearVariant(pvarg);
}

#if 0

void ShowException(LPOLESTR szMember, HRESULT hr, EXCEPINFO *pexcep, unsigned int uiArgErr)
{
      TCHAR szBuf[512];
      
      switch (GetScode(hr)) 
      {
            case DISP_E_UNKNOWNNAME:
                  wsprintf(szBuf, L"%s: Unknown name or named argument.", szMember);
                  break;
      
            case DISP_E_BADPARAMCOUNT:
                  wsprintf(szBuf, L"%s: Incorrect number of arguments.", szMember);
                  break;
                  
            case DISP_E_EXCEPTION:
                  wsprintf(szBuf, L"%s: Error %d: ", szMember, pexcep->wCode);
                  if (pexcep->bstrDescription != NULL)
                        lstrcat(szBuf, pexcep->bstrDescription);
                  else
                        lstrcat(szBuf, L"<<No Description>>");
                  break;
                  
            case DISP_E_MEMBERNOTFOUND:
                  wsprintf(szBuf, L"%s: method or property not found.", szMember);
                  break;
            
            case DISP_E_OVERFLOW:
                  wsprintf(szBuf, L"%s: Overflow while coercing argument values.", szMember);
                  break;
            
            case DISP_E_NONAMEDARGS:
                  wsprintf(szBuf, L"%s: Object implementation does not support named arguments.",
                                    szMember);
                break;
                
            case DISP_E_UNKNOWNLCID:
                  wsprintf(szBuf, L"%s: The locale ID is unknown.", szMember);
                  break;
            
            case DISP_E_PARAMNOTOPTIONAL:
                  wsprintf(szBuf, L"%s: Missing a required parameter.", szMember);
                  break;
            
            case DISP_E_PARAMNOTFOUND:
                  wsprintf(szBuf, L"%s: Argument not found, argument %d.", szMember, uiArgErr);
                  break;
                  
            case DISP_E_TYPEMISMATCH:
                  wsprintf(szBuf, L"%s: Type mismatch, argument %d.", szMember, uiArgErr);
                  break;

            default:
                  wsprintf(szBuf, L"%s: Unknown error occured.", szMember);
                  break;
      }
      
      wxLogWarning(szBuf);
}

#endif

#endif // __WATCOMC__


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