用IDesktopWallpaper接口设置png壁纸

#include <Windows.h>
#include <string>
#include "Shobjidl.h"

int main()
{
    std::wstring x = L"C:\\Users\\strives\\Desktop\\ScreenShot\\panda.png";
    HRESULT  ad;
    CoInitialize(NULL);

    IDesktopWallpaper* p;
    if (SUCCEEDED(CoCreateInstance(__uuidof(DesktopWallpaper), , CLSCTX_LOCAL_SERVER, __uuidof(IDesktopWallpaper), (void**)&p))) {
        ad = p->SetWallpaper(NULL, x.c_str());
        p->Release();
    }

    CoUninitialize();
    return ;
}

初始化IDesktopWallpaper对象，调用SetWallpaper方法