138 lines
3 KiB
C++
138 lines
3 KiB
C++
// faxhelper.cpp : IComponent Interface helpers
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//
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// these functions help with extracting dataobjects and clipboards
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//
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// stolen from the MMC SDK.
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// Copyright (C) 1997 Microsoft Corporation
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// All rights reserved.
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//
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#include "stdafx.h"
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#include "faxhelper.h"
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#pragma hdrstop
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/////////////////////////////////////////////////////////////////////////////
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// We need a few functions to help work with dataobjects and clipboard formats
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CFaxDataObject *
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ExtractOwnDataObject(
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IN LPDATAOBJECT lpDataObject )
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/*++
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Routine Description:
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This routine extracts a CFaxDataObject from a IDataObject.
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Arguments:
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lpDataObject
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Return Value:
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CFaxDataObject * on success, NULL on failure.
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--*/
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{
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// DebugPrint(( TEXT("Trace: ::ExtractOwnDataObjecct") ));
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HRESULT hr = S_OK;
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HGLOBAL hGlobal;
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CFaxDataObject *pdo = NULL;
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if( lpDataObject == NULL ) {
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return NULL;
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}
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hr = ExtractFromDataObject(lpDataObject,
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(CLIPFORMAT)CFaxDataObject::s_cfInternal,
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sizeof(CFaxDataObject **),
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&hGlobal);
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if(SUCCEEDED(hr)) {
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pdo = *(CFaxDataObject **)(hGlobal);
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assert(pdo);
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assert(!GlobalFree(hGlobal));
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}
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return pdo;
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}
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HRESULT
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ExtractFromDataObject(
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IN LPDATAOBJECT lpDataObject,
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IN CLIPFORMAT cf,
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IN ULONG cb,
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OUT HGLOBAL *phGlobal )
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/*++
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Routine Description:
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Asks the IDataObject for the clipboard format specified in cf
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Arguments:
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lpDataObject - the data object passed in
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cf - the requested clipboard format
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cb - the requested number of bytes to allocate for the object
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phGlobal - the global handle to the newly allocated info
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Return Value:
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HRESULT indicating SUCCEEDED() or FAILED()
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--*/
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{
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// DebugPrint(( TEXT("Trace: ::ExtractFromDataObjecct") ));
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HRESULT hr = S_OK;
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STGMEDIUM stgmedium = { TYMED_HGLOBAL, NULL};
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FORMATETC formatetc = { cf, NULL, DVASPECT_CONTENT, -1, TYMED_HGLOBAL};
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assert(lpDataObject != NULL);
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if( lpDataObject == NULL ) {
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return E_POINTER;
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}
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*phGlobal = NULL;
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do
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{
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// Allocate memory for the stream
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stgmedium.hGlobal = GlobalAlloc(GMEM_SHARE, cb);
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if(!stgmedium.hGlobal) {
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hr = E_OUTOFMEMORY;
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ATLTRACE(_T("Out of memory\n"));
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break;
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}
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// Attempt to get data from the object
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try {
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hr = lpDataObject->GetDataHere(&formatetc, &stgmedium);
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} catch( ... ) {
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// an exception happened!
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hr = E_UNEXPECTED;
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}
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if(FAILED(hr)) {
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break;
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}
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*phGlobal = stgmedium.hGlobal;
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stgmedium.hGlobal = NULL;
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} while(0);
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// if the call failed, and we allocated memory,
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// free the memory
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if(FAILED(hr) && stgmedium.hGlobal) {
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if(!GlobalFree(stgmedium.hGlobal)) {
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assert(FALSE);
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};
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}
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return hr;
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}
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