Changing wallpaper via command line

[snippet20]

Ive got this code

#include <windows.h>
#include <string>
using namespace std;

int main(string PATH)
{
SystemParametersInfo( SPI_SETDESKWALLPAPER, 0, PATH, SPIF_UPDATEINIFILE );
return 0;
}


But when i try to compile it i get,
cannot convert `std::string' to `void*'

If i add (PVOID) infront of path then i get
cannot convert `PATH' from type `std::string' to type `void*'

any tips/advice?

[GameZelda]

Use "PATH.c_str()" to get a C-style string that you can pass to that function.

By the way, make sure that you're not using the Unicode functions, because that would also make it fail.

[snippet20]

yeah unicode isnt a problem

but in line 7:
SystemParametersInfo( SPI_SETDESKWALLPAPER, 0, PATH.c_str(), SPIF_UPDATEINIFILE );

now gives "invalid conversion from const void* to void*" if i use (PVOID) infront of it, it compiles but it crashes when i run it, so ill guess im referencing something thats null

[snippet20]

I did a bit more reading on command lines and altered it to this

#include <windows.h>

int main(int argc, char *argv[])
{
if (argc==2){
SystemParametersInfo( SPI_SETDESKWALLPAPER, 0, argv[1], SPIF_UPDATEINIFILE );

}
return 0;
}

with the argument being passed as the path to the new wallpaper, it runs but it doesn't change the wallpaper?

[BobS0327]

give this a try....

SystemParametersInfo(SPI_SETDESKWALLPAPER, 0, argv[1], SPIF_SENDCHANGE);
PostMessage(GetDesktopWindow(), WM_SETTINGCHANGE, NULL, NULL);

[snippet20]

Doesnt change.... Is it just a windows 7 thing? if someone else could run this does it work?

EDIT: It works if i specify the file in the code so i think its a problem with how the argument is sent to SystemParametersInfo