PeekMessage、WaitForSingleObject、PostThreadMessage多线程使用示例

#include <windows.h>
#include <cstdio>
#include <process.h>
#define MY_MSG WM_USER+100
const int MAX_INFO_SIZE = 20;
HANDLE hStartEvent; // thread start event
// thread function
unsigned __stdcall fun(void *param)
{
 printf("thread fun start\n");
 MSG msg;
 PeekMessage(&msg, NULL, WM_USER, WM_USER, PM_NOREMOVE);
 if(!SetEvent(hStartEvent)) //set thread start event 
 {
  printf("set start event failed,errno:%d/n",::GetLastError());
  return 1;
 }
 printf("新线程已经启动正等待接收数据\r\n");
 while(true)
 {
  if(GetMessage(&msg,0,0,0)) //get msg from message queue
  {
   switch(msg.message)
   {
   case MY_MSG:
    char * pInfo = (char *)msg.wParam;
    printf("recv %s\r\n",pInfo);
    delete[] pInfo;
    break;
   }
  }
 };
 return 0;
}
int main()
{
 HANDLE hThread,hThread1;
 unsigned nThreadID,nThreadID1;
 hStartEvent = ::CreateEvent(0,FALSE,FALSE,0); //create thread start event
 if(hStartEvent == 0)
 {
  printf("create start event failed,errno:%d\r\n",::GetLastError());
  return 1;
 }
 //start thread
 hThread = (HANDLE)_beginthreadex( NULL, 0, &fun, NULL, 0, &nThreadID );
 if(hThread == 0)
 {
  printf("start thread failed,errno:%d/n",::GetLastError());
  CloseHandle(hStartEvent);
  return 1;
 }
 printf("启动了新线程\r\n");
 //wait thread start event to avoid PostThreadMessage return errno:1444
 ::WaitForSingleObject(hStartEvent,INFINITE);
 CloseHandle(hStartEvent);
 ::Sleep(1000);
 int count = 0;
 while(true)
 {
  char* pInfo = new char[MAX_INFO_SIZE]; //create dynamic msg
  sprintf(pInfo,"msg_%d",++count);
  if(!PostThreadMessage(nThreadID,MY_MSG,(WPARAM)pInfo,0))//post thread msg
  {
   printf("post message failed,errno:%d\r\n",::GetLastError());
   delete[] pInfo;
  }
  ::Sleep(1000);
 }
 CloseHandle(hThread);
 return 0;
}