IPicture

最新推荐文章于 2025-11-06 15:24:38 发布

原创最新推荐文章于 2025-11-06 15:24:38 发布 · 452 阅读

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#null #file #图形

本文介绍了一种使用Windows API从文件加载图像并将其显示在设备上下文(DC)中的方法。涉及创建文件句柄、内存分配、读取文件内容、创建流、加载图片对象以及释放资源等步骤。

/*HDC hDC_Temp = ::GetDC(hWnd);
    IPicture *pPic;
    IStream *pStm;

    BOOL bResult;
    HANDLE hFile = NULL;
    DWORD dwFileSize, dwByteRead;

    hFile = CreateFile(lpImageFile, GENERIC_READ, FILE_SHARE_READ
, NULL, OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL, NULL);

    if(hFile != INVALID_HANDLE_VALUE)
    {
        dwFileSize = GetFileSize(hFile, NULL);

        if(dwFileSize == INVALID_FILE_SIZE)
            return E_FAIL;
    }
    else
    {
        return E_FAIL;
    }

    HGLOBAL hGlobal = ::GlobalAlloc(GMEM_MOVEABLE, dwFileSize);
    LPVOID pvData = NULL;

    if(hGlobal == NULL)
    {
        AfxMessageBox(_T("图形文件分配出错"));
        return E_FAIL;
    }

    if((pvData = GlobalLock(hGlobal)) == NULL)
    {
        AfxMessageBox(_T("内存快锁定出现问题"));
        return E_FAIL;
    }

    ReadFile(hFile, pvData, dwFileSize, &dwByteRead, NULL);

    GlobalUnlock(hGlobal);

    if(CreateStreamOnHGlobal(hGlobal, TRUE, &pStm) != S_OK)
    {
        AfxMessageBox(_T("流初始化失败"));
        return E_FAIL;
    }

    bResult = ::OleLoadPicture(pStm, dwFileSize, TRUE, IID_IPicture, (LPVOID*)&pPic);

    OLE_XSIZE_HIMETRIC hmWidth;
    OLE_XSIZE_HIMETRIC hmHeight;
    pPic->get_Width(&hmWidth);
    pPic->get_Height(&hmHeight);

    bResult = pPic->Render(hDC_Temp, 0, 0, nScrWidth, nSrcHeight, 0, hmHeight, hmWidth, -hmHeight, NULL);

    CloseHandle(hFile);
    pPic->Release();
    ::GlobalFree(hGlobal);

    if(bResult)
        return S_OK;*/