One day,I want to set the desktop wallpaper by the application which I wrote using Win32 in c++.First,I used the api SystemParametersInfo(SPI_SETDESKWALLPAPER,TRUE,(LPVOID)"E:\\my_docs\\test.jpg",SPIF_SENDWININICHANGE| SPIF_UPDATEINIFILE); But it can not work.So I checked with MSDN: SPI_SETDESKWALLPAPER...