拥有主消息循环的worker线程

/*Demonstrate using worker threads that

have their own message queue but no window.
*/
#define WIN32_LEAN_AND_MEAN
#include<stdio.h>
#include<stdlib.h>
#include<Windows.h>
#include<process.h>
#include<string.h>
#include "MeVVerify.h"


unsigned WINAPI ThreadFunc(void* p);
HANDLE ghEvent;


#define WM_JOB_PRINT_AS_IS WM_APP+0x0001
#define WM_JOB_PRINT_REVERSE WM_APP+0x0002
#define WM_JOB_PRINT_LOWER WM_APP+0x0003


int main(VOID)
{
HANDLE hThread;
unsigned tid;
//Give the new thread something to talk to us with
ghEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
hThread = (HANDLE)_beginthreadex(NULL, 0,
ThreadFunc, 0, 0, &tid);
MTVERIFY(hThread);
//This thread has to wait for the new  thread
//to init its globals and msg queue.
WaitForSingleObject(ghEvent,INFINITE);
//the only place in the book we get to use the thread ID
char *szText = strdup("Thank you for buying this book.\n");
PostThreadMessage(tid, WM_JOB_PRINT_AS_IS, NULL,
(LPARAM)szText);
szText = strdup("Text is easier to read forward.\n");
PostThreadMessage(tid, WM_JOB_PRINT_REVERSE, NULL, (LPARAM)szText);
szText = strdup("\n LOWER CASE IS FOR WHISPERING.\n");
PostThreadMessage(tid, WM_JOB_PRINT_LOWER, NULL, (LPARAM)szText);
WaitForSingleObject(hThread, INFINITE);
CloseHandle(hThread);
return 0;
}
VOID CALLBACK TimerFunc(
HWND hwnd,//handle of window for timer message
UINT uMsg,//WM_TIMER message
UINT idEvent,//timer identifier
DWORD dwTime//current system time
)
{
UNREFERENCED_PARAMETER(hwnd);
UNREFERENCED_PARAMETER(uMsg);
PostThreadMessage(GetCurrentThreadId(), WM_QUIT, 0, 0);
}
/*call a function to do something that terminates
the thread with ExitThread instead of returning */
unsigned WINAPI ThreadFunc(LPVOID n)
{
UNREFERENCED_PARAMETER(n); 
MSG msg;
//This creates the message queue
PeekMessage(&msg, NULL, 0, 0, PM_NOREMOVE);
SetEvent(ghEvent);
//We'll run for two seconds
SetTimer(NULL, NULL, 2000, (TIMERPROC)TimerFunc);
while (GetMessage(&msg, NULL, 0, 0))
{
char *psz = (char*)msg.lParam;
switch (msg.message)
{
case WM_JOB_PRINT_AS_IS:
printf("%s", psz);
free(psz);
break;
case WM_JOB_PRINT_REVERSE:
printf("%s", strrev(psz));
break;
case WM_JOB_PRINT_LOWER:
printf("%s", _strlwr(psz));
free(psz);
break;
default:
DispatchMessage(&msg);
}
}
return 0;
}