Changing wallpaper via command line

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?

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.

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

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?

give this a try....

Code:

---

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

---

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