various cleanups

[wxWidgets.git] / src / msw / ole / automtn.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        automtn.cpp
// Purpose:     OLE automation utilities
// Author:      Julian Smart
// Modified by:
// Created:     11/6/98
// RCS-ID:      $Id$
// Copyright:   (c) 1998, Julian Smart
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
#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(__BORLANDC__) && (__BORLANDC__ < 0x520)) && !defined(__CYGWIN10__)

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

#include <math.h>

#ifdef __WXWINCE__
#include "wx/msw/wince/time.h"
#else
#include <time.h>
#endif

#include <wtypes.h>
#include <unknwn.h>

#include <ole2.h>
#define _huge

#ifndef __WXWINCE__
#include <ole2ver.h>
#endif

#include <oleauto.h>

// 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_DATETIME
#include "wx/datetime.h"

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] = wxConvertStringToOle(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)] = wxConvertStringToOle(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 (!wxConvertVariantToOle(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
            wxConvertOleToVariant(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;

    wxBasicString 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;

    wxBasicString 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 wxConvertVariantToOle(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(__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 = wxConvertStringToOle(str);
    }
#if wxUSE_DATETIME
    else if (type == wxT("datetime"))
    {
        wxDateTime date( variant.GetDateTime() );
        oleVariant.vt = VT_DATE;

        if (!OleDateFromTm(date.GetYear(), date.GetMonth(), date.GetDay(),
                date.GetHour(), date.GetMinute(), date.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 (!wxConvertVariantToOle(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 wxConvertOleToVariant(const VARIANTARG& oleVariant, wxVariant& variant)
{
    switch (oleVariant.vt & VT_TYPEMASK)
    {
    case VT_BSTR:
        {
            wxString str(wxConvertStringFromOle(oleVariant.bstrVal));
            variant = str;
            break;
        }
    case VT_DATE:
        {
#if wxUSE_DATETIME
            struct tm tmTemp;
            if (!TmFromOleDate(oleVariant.date, tmTemp))
                return false;

            wxDateTime date(tmTemp.tm_yday, (wxDateTime::Month) tmTemp.tm_mon, tmTemp.tm_year, tmTemp.tm_hour, tmTemp.tm_min, tmTemp.tm_sec);

            variant = date;
#endif

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

    case VT_BOOL:
        {
#if (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 (!wxConvertOleToVariant(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;
}

BSTR wxConvertStringToOle(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];
*/
    wxBasicString bstr(str.mb_str());
    return bstr.Get();
}

wxString wxConvertStringFromOle(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;
}

// ----------------------------------------------------------------------------
// wxBasicString
// ----------------------------------------------------------------------------

// ctor takes an ANSI string and transforms it to Unicode
wxBasicString::wxBasicString(const char *sz)
{
    Init(sz);
}

// ctor takes an ANSI or Unicode string and transforms it to Unicode
wxBasicString::wxBasicString(const wxString& str)
{
#if wxUSE_UNICODE
    m_wzBuf = new OLECHAR[str.Length() + 1];
    memcpy(m_wzBuf, str.c_str(), str.Length()*2);
    m_wzBuf[str.Length()] = L'\0';
#else
    Init(str.c_str());
#endif
}

// Takes an ANSI string and transforms it to Unicode
void wxBasicString::Init(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
wxBasicString::~wxBasicString()
{
  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 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

    // 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 // wxUSE_OLE && !(defined(__BORLANDC__) && (__BORLANDC__ < 0x520)) && !defined(__CYGWIN10__)