windows核心編程-線程消息隊列

/*
該程序演示了通過PeekMessage強制創建消息隊列，然後Sleep等待執行創建的線程
*/
#include<windows.h>
#include<tchar.h>
#include<strsafe.h>

#define GRS_USEPRINTF() TCHAR pBuf[1024]={}
#define GRS_PRINTF(...)\
	StringCchPrintf(pBuf, 1024, __VA_ARGS__); \
	WriteConsole(GetStdHandle(STD_OUTPUT_HANDLE), pBuf, lstrlen(pBuf), NULL, NULL);

DWORD WINAPI ThreadFunction(LPVOID lpParam)
{
	//線程函數
	GRS_USEPRINTF();
	MSG msg = {};
	//這句將強制系統創建一個消息隊列，註釋時候可能看到該線程沒有受到任何消息
	PeekMessage(&msg,NULL,0,0,PM_NOREMOVE);

	//模擬一個耗時的初始化過程
	for (int i = 0; i < 10000000; i++);

	//一個簡單的消息循環
	while (GetMessage(&msg, NULL, 0, 0))
	{
		GRS_PRINTF(_T("線程[ID:0x%x]收到消息-0x%04x\t時間(GetTickCount值)-%u\n"),
			GetCurrentThreadId(),msg.message,msg.time);
	}

	//執行到這裏表示收到的是WM_QUIT消息
	GRS_PRINTF(_T("線程[ID:0x%x]收到退出消息-0x%04x\t時間(GetTickCount值)-%u\n"),
		GetCurrentThreadId(), msg.message, msg.time);
	return msg.wParam;
}

int _tmain()
{
	DWORD dwThreadID = 0;
	HANDLE hThread = CreateThread(NULL,0,ThreadFunction,NULL,0,&dwThreadID);
	//這兩個消息可能收不到，因爲新線程默認沒有消息隊列
	PostThreadMessage(dwThreadID,0x001,0,0);
	PostThreadMessage(dwThreadID, 0x002, 0, 0);
	Sleep(10);

	//強制切換到新線程去執行，住時候有可能看到兩個線程都在等待而死鎖
	PostThreadMessage(dwThreadID, 0x003, 0, 0);
	PostThreadMessage(dwThreadID, 0x004, 0, 0);

	//向新線程發送退出消息
	PostThreadMessage(dwThreadID, WM_QUIT, (WPARAM)GetCurrentThreadId(), 0);

	//等待新線程退出
	WaitForSingleObject(hThread,INFINITE);
	_tsystem(_T("PAUSE"));
	return 0;
}