测速小工具

Posted 2020-11-12 hbg200

    测试一下速度，可以掌握运算或操作耗用时间，为掌握程序运行速度提供帮助。

//---------------------------------------------------------------------------
//测速

_LARGE_INTEGER iTestSpeed_StartTime;
double fTestSpeed_Freq;//测速用频率

void __fastcall StartTiming(void)//开始计时
{
   _LARGE_INTEGER f;

   QueryPerformanceFrequency(&f);//读取频率
   fTestSpeed_Freq = (double)f.QuadPart;
   QueryPerformanceCounter(&iTestSpeed_StartTime);//开始计时
}  

void __fastcall StopTiming(TForm *Form)//停止计时
{
   _LARGE_INTEGER iTestSpeed_StopTime; double fResult;

   QueryPerformanceCounter(&iTestSpeed_StopTime);
   fResult = ((double)(iTestSpeed_StopTime.QuadPart - iTestSpeed_StartTime.QuadPart) / fTestSpeed_Freq * 1000);//Ret ms
   Form->Caption = FormatFloat("0.0", fResult);
}
//---------------------------------------------------------------------------

开始时，使用StartTiming，结束时使用StopTiming，结果显示在窗体标题栏上。返回显示的单位是ms。