changing value in window title

[Fransje]

Hi all,
I wondered how to program a changing value in the title of a window (for example the FPS, or a download finished percentage). I tried this:

#include <iostream>
#include <sstream>

#include <Windows.h>

using namespace std;

int main( int argc, char* argv[] ) {
    int a = 0;
    stringstream counter;    
    
    while ( GetAsyncKeyState( VK_ESCAPE ) != 0 ) {
        counter.str( "" );
        counter << ++a;
        
        SetConsoleTitle( counter.str().c_str() );
    }   
    
    return 0;
}

but it immediately closes. Anyone knows what I'm doing wrong? And perhaps suggestions how to do this?
Thanks!

[Callum5042]

Change
while ( GetAsyncKeyState( VK_ESCAPE ) != 0 )
to
while ( GetAsyncKeyState( VK_ESCAPE ) == 0 )

That will keep it open, but I ran it on my computer and it got a massive memory leak, which I'm not sure why..

EDIT: I took SetConsoleTitle( counter.str().c_str() ); out of the loop and it runs better.