GetWindowsDir in C++?

[crptcblade]

#include <iostream.h>
#include <windows.h>

//using namespace std;

int main()
{
    UINT i;
    char path[MAX_PATH];
    UINT sz = MAX_PATH;
    i = GetWindowsDirectory(path, sz); 

    if (i==ERROR_SUCCESS) {
        cout << path << endl;
        // you got it --- path is a null terminated string
    }
    else {
        cout << "error" << endl;
        //something bombed.... not very likely with this call
        //call GetLastError to see what happened
    } 

    return 0;

} 

keeps outputting "error"

If I say if(i != ERROR_SUCCESS), I get the correct path.