BlockInput() fails

[DGvMDjzh]

I found a neat windows function called BlockInput(), it's supposed to block your mouse/keyboard controls globally.

#include <windows.h>
#include <winable.h>
#include <time.h>

int main() {
 BlockInput(true);
 while (clock() < 5000) {}
 BlockInput(false);
}

Unfortunately BlockInput(true) returns 0 which indicates that there's some sort of error. Any ideas what it could be? I use Windows 7.

[Moooce]

from msdn:

If input is already blocked, the return value is zero. To get extended error information, call GetLastError.

Calling GetLastError will give you info on what is causing the error.

[DGvMDjzh]

Thanks for the response. It appears that access to the function was denied because I didn't run the program as an administrator.