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无法被打开"),fname); MessageBox(str); return FALSE; } //取得文件大小 DWORD dwFileSize=GetFileSize(hFile,NULL); if((DWORD)-1==dwFileSize) { CloseHandle(hFile); MessageBox(_T("图像文件是空的")); return FALSE; } //读取图像文件 LPVOID pvData; //按文件大小分配内存 HGLOBAL hGlobal=GlobalAlloc(GMEM_MOVEABLE,dwFileSize); if(NULL==hGlobal) { CloseHandle(hFile); MessageBox(_T("内存不足,无法分配足够内存")); return FALSE; } pvData=GlobalLock(hGlobal); if(NULL==pvData) { GlobalUnlock(hGlobal); CloseHandle(hFile); MessageBox(_T("无法锁定内存")); return FALSE; } DWORD dwFileRead=0; BOOL bRead=ReadFile(hFile,pvData,dwFileSize,&dwFileRead,NULL); GlobalUnlock(hGlobal); CloseHandle(hFile); if(FALSE==bRead) { MessageBox(_T("读文件出错")); return FALSE; } LPSTREAM pstm=NULL; //从已分配内存生成IStream流 HRESULT hr=CreateStreamOnHGlobal(hGlobal,TRUE,&pstm); if(!SUCCEEDED(hr)) { MessageBox(_T("生成流操作失败")); if(pstm!=NULL) pstm->Release(); return FALSE; } else if(pstm==NULL) { MessageBox(_T("生成流操作失败")); return FALSE; } if(!*lppi) (*lppi)->Release(); hr=OleLoadPicture(pstm,dwFileSize,FALSE,IID_IPicture,(LPVOID*)&(*lppi)); pstm->Release(); if(!SUCCEEDED(hr)) { MessageBox(_T("加载操作失败")); return FALSE; } else if(*lppi==NULL) { MessageBox(_T("加载操作失败")); return FALSE; } return TRUE; } |