在WIN7下特定图片SystemParametersInfo失败，但是GetLastError()返回0

if (SystemParametersInfoA(SPI_SETDESKWALLPAPER, 0, "C:\\1.jpg", SPIF_UPDATEINIFILE | SPIF_SENDWININICHANGE))
    {
        cout << "成功" << endl;
    }
    else
    {
        cout << "失败" << GetLastError() << endl;

    }

使用com接口解决这个问题

VOID SetWallpaper(TCHAR *szFilename, INT nStyle)
{
    CoInitializeEx(0, COINIT_APARTMENTTHREADED);
    IActiveDesktop* iADesktop;
    HRESULT status = CoCreateInstance(CLSID_ActiveDesktop, NULL, CLSCTX_INPROC_SERVER, IID_IActiveDesktop, (void**)&iADesktop);
    WALLPAPEROPT wOption;
    ZeroMemory(&wOption, sizeof(WALLPAPEROPT));
    wOption.dwSize = sizeof(WALLPAPEROPT);
    switch (nStyle)
    {
    case 0:
    {
        wOption.dwStyle = WPSTYLE_STRETCH;
    }break;
    case 1:
    {
        wOption.dwStyle = WPSTYLE_TILE;
    }break;
    case 2:
    {
        wOption.dwStyle = WPSTYLE_CENTER;
    }break;
    default:
        wOption.dwStyle = WPSTYLE_STRETCH;
    }
    status = iADesktop->SetWallpaper(szFilename, 0);
    status = iADesktop->SetWallpaperOptions(&wOption, 0);
    status = iADesktop->ApplyChanges(AD_APPLY_ALL);
    iADesktop->Release();
    CoUninitialize();
}

引用资料：(V)C++ Set Desktop Wallpaper ( WIN 7 x64 ... [SOLVED] | DaniWeb