automtn.cpp

很牛的GUI源码wxWidgets-2.8.0.zip 可在多种平台下运行.

/////////////////////////////////////////////////////////////////////////////
// Name:        src/msw/ole/automtn.cpp
// Purpose:     OLE automation utilities
// Author:      Julian Smart
// Modified by:
// Created:     11/6/98
// RCS-ID:      $Id: automtn.cpp,v 1.52 2006/11/12 16:30:38 JS Exp $
// Copyright:   (c) 1998, Julian Smart
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

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

#if defined(__BORLANDC__)
    #pragma hdrstop
#endif

// With Borland C++, all samples crash if this is compiled in.
#if (defined(__BORLANDC__) && (__BORLANDC__ < 0x520)) || defined(__CYGWIN10__)
    #undef wxUSE_OLE_AUTOMATION
    #define wxUSE_OLE_AUTOMATION 0
#endif

#if wxUSE_OLE_AUTOMATION

#ifndef WX_PRECOMP
    #include "wx/log.h"
    #include "wx/math.h"
#endif

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

#if wxUSE_DATETIME
#include "wx/datetime.h"
#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,
                        (WORD)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)
    {