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;
}