C/C++ 学习之 定时器

下面是两个简单的例子，说明在  windows  控制台应用程序中定时器的用法

1、直接声明回调函数，然后在回调函数中处理消息。

// programe for timer

#include "stdio.h"
#include "conio.h"
#include <Windows.h>

int count = 0;

void CALLBACK TimerProc (HWND hwnd, UINT message, UINT iTimerID, DWORD dwTime)
{
printf("WM_TIMER in work thread count = %d\n",count++);
}

int main()
{
SetTimer (NULL, 0, 1000, TimerProc);
MSG msg;
    while(GetMessage(&msg,NULL,0,0))
    {
if(msg.message==WM_TIMER)
{
DispatchMessage(&msg);
if(count == 7)
{
printf("should stop!\n");
break;
}
}
    }
KillTimer (NULL, 0);
return 0;
}

2、建立线程，在线程中建立消息处理机制

//programe for timer

#include   <windows.h>  #include   <stdio.h>  #include   <conio.h>  unsigned   long   WINAPI   Thread(PVOID   pvoid); void   main()  {      DWORD   dwThreadId;      printf("控制台应用程序：线程-定时器\n");      HANDLE hThread = CreateThread(NULL, 0, Thread, 0, 0, &dwThreadId);//安全等级，默认栈空间，线程名，线程参数，编程标志，线程ID                       DWORD   dwwait = WaitForSingleObject(hThread,1000*30);      switch(dwwait)    {      case   WAIT_ABANDONED:          printf("main thread WaitForSingleObject return WAIT_ABANDONED\n");          break;      case   WAIT_OBJECT_0:          printf("main thread WaitForSingleObject return WAIT_OBJECT_0\n");          break;      case   WAIT_TIMEOUT:          printf("main thread WaitForSingleObject return WAIT_TIMEOUT\n");          break;      }      CloseHandle(hThread);      getch();  }  unsigned  long   WINAPI   Thread(PVOID   pvoid)  {      MSG   msg;    PeekMessage(&msg,   NULL,   WM_USER,   WM_USER,   PM_NOREMOVE);//该函数为一个消息检查线程消息队列，并将该消息（如果存在）放于指定的结构。//接收消息的 MSG 结构指针，句柄，指定被检查的消息范围里的第一个消息，最后一个，确定消息如何被处理//PM_NOREMOVE，PeekMessage处理后，消息不从队列里除掉//PM_REMOVE，PeekMessage处理后，消息从队列里除掉//PM_NOYIELD，此标志使系统不释放等待调用程序空闲的线程    UINT   timerid = SetTimer(NULL,111,1000,NULL);      BOOL   bRet;      int   count = 0;      while((bRet = GetMessage(&msg, NULL, 0, 0)) != 0)      {            if(bRet == -1)          {              //   handle   the   error   and   possibly   exit          }          else if(msg.message == WM_TIMER)         {              printf("WM_TIMER in work thread count = %d\n",count++);              if(count>4)  break;          }          else          {              TranslateMessage(&msg);   //将虚拟键消息转换为字符消息,下一次线程调用函数GetMessage或PeekMessage时被读出。            DispatchMessage(&msg);   //该函数分发一个消息给窗口程序,消息传递给操作系统，然后操作系统去调用我们的回调函数        }      }      KillTimer(NULL,timerid);      printf("thread  end  here\n");      return   0;  }