TestTimer.c

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#include <stdio.h>
#include <conio.h>
#include <windows.h>
 
void main ( int argc, char** argv, char** environ )
{
 LARGE_INTEGER liFrequency;
 LARGE_INTEGER liStartTime;
 LARGE_INTEGER liCurrentTime;
 
 QueryPerformanceFrequency ( &liFrequency );
 printf ( "HIGH RESOLUTION PERFOMANCE COUNTER Frequency = %I64d CLOCKS IN SECOND\n",
         liFrequency.QuadPart );
 
 
 if (liFrequency.QuadPart == 0)
 {
    printf("Your computer does not support High Resolution Performance counter\n");
    return;
 }
 
 printf ( "Press <ENTER> to start test...\n" );
 getchar();
 
 printf ( "\nPress any key to quit test\n\n" );
 QueryPerformanceCounter ( &liStartTime );
 for (;;)
 {
    QueryPerformanceCounter ( &liCurrentTime );
    printf("Elapsed Time : %8.6f mSec\r",
          ((double)( (liCurrentTime.QuadPart - liStartTime.QuadPart)* (double)1000.0/(double)liFrequency.QuadPart )) );
    if (_kbhit())
        break;
 }
 
 
}