VC++ 设置桌面壁纸

Windows Shell API提供了接口IActiveDesktop来完成墙纸的设置。

//IActiveDesktop 接口方法表　（详情参见MSDN）

AddDesktopItem
AddDesktopItemWithUI
AddUrl
ApplyChange
GenerateDesktopItemHtml
GetDesktopItem
GetDesktopItemByID
GetDesktopItemBySource
GetDesktopItemCount
GetDesktopItemOptions
GetPattern
GetWallpaper
GetWallpaperOptions
ModifyDesktopItem
RemoveDesktopItem
SetDesktopItemOptions
SetPattern
SetWallpaper
SetWallpaperOptions

 　　C++ Code 

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BOOL SetWallpaper(CString &strPicFile, DWORD dwStyle)
{
    HRESULT hr = S_OK;
    IActiveDesktop* pIAD = NULL;

    //创建接口的实例
    hr = CoCreateInstance(CLSID_ActiveDesktop, NULL, CLSCTX_INPROC_SERVER, IID_IActiveDesktop, (void**) &pIAD );
    if (FAILED(hr))
    {
        return FALSE;
    }

    //将文件名改为宽字符串,这是IActiveDesktop::SetWallpaper的要求
    WCHAR wszWallpaper [MAX_PATH] = {0};
    LPTSTR lpStr = strPicFile.GetBuffer(strPicFile.GetLength() );
    MultiByteToWideChar(CP_ACP, 0, lpStr, -1, wszWallpaper, MAX_PATH);
    strPicFile.ReleaseBuffer();

    //设置墙纸
    hr = pIAD->SetWallpaper(wszWallpaper, 0);
    if (FAILED(hr))
    {
        return FALSE;
    }

    //设置墙纸的样式
    WALLPAPEROPT wpo;
    wpo.dwSize = sizeof(wpo);
    wpo.dwStyle = dwStyle;
    hr = pIAD->SetWallpaperOptions(&wpo, 0);
    if(!SUCCEEDED(hr))
    {
        return FALSE;
    }

    //应用墙纸的设置
    hr = pIAD->ApplyChanges(AD_APPLY_ALL);
    if(!SUCCEEDED(hr))
    {
        return FALSE;
    }

    //读取墙纸的文件名并打印在debug窗口内
    hr = pIAD->GetWallpaper(wszWallpaper, MAX_PATH, 0);
    CString strFile = wszWallpaper;
    TRACE(strFile);

    //释放接口的实例
    pIAD->Release();
    return TRUE;
}

BOOL EnableActiveDesktop(BOOL bEnable)
{
    HRESULT hr = S_OK;
    IActiveDesktop* pIAD = NULL;

    //创建接口的实例
    hr = CoCreateInstance ( CLSID_ActiveDesktop, NULL, CLSCTX_INPROC_SERVER, IID_IActiveDesktop, (void**) &pIAD );
    if(!SUCCEEDED(hr))
    {
        return FALSE;
    }

    //启用或关闭Active desktop
    COMPONENTSOPT comp;
    comp.dwSize = sizeof(comp);
    comp.fEnableComponents = bEnable;
    comp.fActiveDesktop = bEnable;
    hr = pIAD->SetDesktopItemOptions(&comp, 0);
    if(!SUCCEEDED(hr))
    {
        return FALSE;
    }

    //释放接口的实例
    pIAD->Release;
    return TRUE;
}

　　Demo下载：http://pan.baidu.com/s/1bpjFyNX