BOOL LoadMyJpegFile(CString fname,LPPICTURE *lppi) { HANDLE hFile=CreateFile(fname,GENERIC_READ,0,NULL,OPEN_EXISTING,0,NULL); if(hFile==INVALID_HANDLE_VALUE) { CString str; str.Format(_T("%s無法被打開"),fname); MessageBox(str); return FALSE; } //取得文件大小 DWORD dwFileSize=GetFileSize(hFile,NULL); if((DWORD)-1==dwFileSize) { CloseHandle(hFile); MessageBox(_T("圖像文件是空的")); return FALSE; } //讀取圖像文件 LPVOID pvData; //按文件大小分配內存 HGLOBAL hGlobal=GlobalAlloc(GMEM_MOVEABLE,dwFileSize); if(NULL==hGlobal) { CloseHandle(hFile); MessageBox(_T("內存不足,無法分配足夠內存")); return FALSE; } pvData=GlobalLock(hGlobal); if(NULL==pvData) { GlobalUnlock(hGlobal); CloseHandle(hFile); MessageBox(_T("無法鎖定內存")); return FALSE; } DWORD dwFileRead=0; BOOL bRead=ReadFile(hFile,pvData,dwFileSize,&dwFileRead,NULL); GlobalUnlock(hGlobal); CloseHandle(hFile); if(FALSE==bRead) { MessageBox(_T("讀文件出錯")); return FALSE; } LPSTREAM pstm=NULL; //從已分配內存生成IStream流 HRESULT hr=CreateStreamOnHGlobal(hGlobal,TRUE,&pstm); if(!SUCCEEDED(hr)) { MessageBox(_T("生成流操作失敗")); if(pstm!=NULL) pstm->Release(); return FALSE; } else if(pstm==NULL) { MessageBox(_T("生成流操作失敗")); return FALSE; } if(!*lppi) (*lppi)->Release(); hr=OleLoadPicture(pstm,dwFileSize,FALSE,IID_IPicture,(LPVOID*)&(*lppi)); pstm->Release(); if(!SUCCEEDED(hr)) { MessageBox(_T("加載操作失敗")); return FALSE; } else if(*lppi==NULL) { MessageBox(_T("加載操作失敗")); return FALSE; } return TRUE; }
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