PostThreadMessage的例子

最新推荐文章于 2023-07-18 12:01:12 发布

转载最新推荐文章于 2023-07-18 12:01:12 发布 · 467 阅读

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#winapi #thread #null #include #delete #user

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本文介绍了一个使用Windows API实现并发线程的消息传递机制，并详细解释了内存管理过程，包括内存分配、消息发送与接收，以及如何安全地处理内存以避免内存泄漏。

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#include <stdio.h>
#include <windows.h>
#include <iostream.h>
#include <process.h>
#define UM_MSG1 WM_USER+1
#define UM_MSG2 WM_USER+2
DWORD WINAPI Thread1(LPVOID para)
{

    DWORD dwThreadId = *(DWORD *)para;
    DWORD i=0;
    TCHAR *p;
    char strTmp[100];

    while(TRUE)
    {
        Sleep(1700);
        p=new TCHAR[10];
        sprintf(strTmp,"Hello %d %x",i++,p);
        PostThreadMessage(dwThreadId,UM_MSG1,(WPARAM)strTmp,(LPARAM)p);
        //delete []p;
    }

    return 0;

}
DWORD WINAPI Thread2(LPVOID para)
{

    char strTmp[100];
    DWORD dwThreadId = *(DWORD *)para;
    DWORD i=0;
    TCHAR *p;
    while(TRUE)
    {

        Sleep(3000);
        p=new TCHAR[10];
        sprintf(strTmp,"World %d %x",i++,p);
        PostThreadMessage(dwThreadId,UM_MSG2,(WPARAM)strTmp,(LPARAM)p);
        //delete []p;
    }

    return 0;

}
int main()
{

    DWORD dwValue =GetCurrentThreadId();
    cout<<"GetCurrentThreadId "<<dwValue<<endl;;
    HANDLE hThread1 = CreateThread(NULL,0,&Thread1,&dwValue,0,NULL);
    HANDLE hThread2 = CreateThread(NULL,0,&Thread2,&dwValue,0,NULL);
    CloseHandle(hThread1);
    CloseHandle(hThread2);
    MSG msg;
    while(GetMessage(&msg,NULL,0,0))
    {
        switch(msg.message)
        {
        case UM_MSG1:
        case UM_MSG2:
            printf("msg:0x%x /t%x /t%s0/n",msg.message,msg.lParam,msg.wParam);
            //注释掉这句你就会看到堆内存地址变化
            delete [](TCHAR *)msg.lParam;
            break;
        default:
            printf("Unknown msg:0x%x/n",msg.message);
            break;
        }
        Sleep(1);
    }
    return 0;
}