CPU的速度随温度和电压的变化而变化,如何随时查看CPU的速度?下面我们通过编程实现。在这个过程中,要用到汇编语言的知识。
zN8V~M; luxKgcU 第一步:生成一个基于对话框的工程CPUSpeed。其他选项我们可以都取其默认值。
=ZJ?xA8 E 4$h%5 第二步:在对话框上添加一个按钮,名称为"测试CPU速度",双击此按钮生成此按钮的处理函数,OnButton1。
YM5;mPR d!>PqPo 第三步:在CPUSpeedDlg.cpp文件中定义类Ctime,在OnButton1中添加处理代码,最后文件CPUSpeedDlg.cpp变成如下:
W &*0F~ - // CPUSpeedDlg.cpp : implementation file
- //
- #include "stdafx.h"
- #include "CPUSpeed.h"
- #include "CPUSpeedDlg.h"
- #ifdef _DEBUG
- #define new DEBUG_NEW
- #undef THIS_FILE
- static char THIS_FILE[] = __FILE__;
- #endif
- ///////////////////////////////////////////////
- // CAboutDlg dialog used for App About
- inline unsigned __int64 theCycleCount(void)
- {
- _asm _emit 0x0F
- _asm _emit 0x31
- /// this causes a compiler warning as there is no return statement
- /// however the _emits return a __int64 value
- }
- class CTimer
- {
- unsigned __int64 m_start;
- public:
- unsigned __int64 m_overhead;
- CTimer(void)
- {
- m_overhead = 0;
- Start(); /// we get the start cycle
- m_overhead = Stop();
- // then we get the stop cycle catching the overhead time
- }
- void Start(void)
- {
- m_start = theCycleCount();
- }
- unsigned __int64 Stop(void)
- {
- /// with the stop cycle we remove the overhead's time
- return theCycleCount()-m_start-m_overhead;
- }
- };
- void CCPUSpeedDlg::OnButton1()
- {
- // TODO: Add your control notification handler code here
- CString strRawClockFrequency;
-
- CTimer timer;
- long tickslong;
- long tickslongextra;
- timer.Start();
- Sleep(1000);
- unsigned cpuspeed100 = (unsigned)(timer.Stop()/10000);
- tickslong = cpuspeed100/100;
- tickslongextra = cpuspeed100-(tickslong*100);
- strRawClockFrequency.Format("%d.%d MHZ estimate ", tickslong,tickslongextra );
- AfxMessageBox("CPU速度为"+strRawClockFrequency);
- }
- class CAboutDlg : public CDialog
- {
- ……以下为编程环境生成时自动生成的代码。
Nkc=@l{ 好了,现在点击按钮"测试CPU速度"就可以弹出对话框告诉我们CPU的速度了。