Change wallpaper programmatically using c++ and windows api

Question

I\'ve been trying to write an application, using Qt and mingw32, to download images and set them as the background Wallpaper. I have read several articles online about how to do

Answer 1

It could be that SystemParametersInfo is expecting an LPWSTR (a pointer to wchar_t).

Try this:

LPWSTR test = L"C:\\Documents and Settings\\Owner\\My Documents\\Wallpapers\\wallpaper.png";

result = SystemParametersInfo(SPI_SETDESKWALLPAPER, 0, test, SPIF_UPDATEINIFILE);

If this works (try it with a few different files just to make sure), you'll need to convert your char * to a LPWSTR. I'm not sure if Qt offers these services, but one function that may help is MultiByteToWideChar.