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windows下QT前台和linux下后台程序通过socket通信

第七根弦 2015 年 6 月 30 日 QT, UC 发表评论 (0)

通常情况下，linux下的后台程序不需要GUI进行展示，而前台程序往往有个界面，方便和用户的交互。本文所演示的例子，是QT 程序和后台linux进程（C语言）交互，通过socket传输的内容是结构体。因为QT本身是跨平台的框架，因此以后前端程序移植到其它平台依然能很好的运行。

结构体的定义如下：

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struct Test
{
        int a;
        char b;
};

QT程序：windows系统，使用QT提供的服务器类QTCPServer 、QTcpSocket和相关函数。

linux下的C程序：通过linux提供的socket编程接口，连接服务器，并发送结构体。

QT程序的关键代码如下：

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void TcpServerDemo::on_listenButton_clicked()
{
    this->tcpServer = new TcpServer(this);
 
    QString ip;
    ip = ui->ipLineEdit->text();
    QString port ;
    port = ui->portLineEdit->text();
 
    if (! this->tcpServer->listen(QHostAddress(ip), (quint16)(port.toInt())))
    {
        QMessageBox::warning(this, tr("tcp server"),
                             tr("listen error:%1").arg(this->tcpServer->errorString()));
        return;
    }
    ui->listenButton->setEnabled(false);
}
 
void TcpServer::incomingConnection ( int socketDescriptor )
{
    this->tcpSocket = new QTcpSocket(this);
    this->tcpSocket->setSocketDescriptor(socketDescriptor);
    QObject::connect(this->tcpSocket, SIGNAL(readyRead()),
                     this, SLOT(on_ready_read()));
}

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void TcpServer::on_ready_read()
{
    struct Test t;
    this->tcpSocket->read((char *)&t,sizeof(t));
    QMessageBox::warning(NULL, tr("tcp server"),
                         tr("a=%1 b=%2").arg(t.a).arg(t.b));
}

linux下C程序的关键代码：

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    int sockfd;
    struct sockaddr_in servaddr;//, myaddr;
    struct Test* p;
    char buf[N] = {0};
    ssize_t n;
    if (argc != 3)
    {
        printf("usage:%s serverip serverport\n", argv[0]);
        return 0;
    }
    if ((sockfd = socket(PF_INET, SOCK_STREAM, 0)) == -1)
    {
        perror("socket");
        return -1;
    }
    memset(&servaddr, 0, sizeof(servaddr));
    servaddr.sin_family = PF_INET;
    servaddr.sin_port = htons(atoi(argv[2]));//error htons("6000");
    servaddr.sin_addr.s_addr = inet_addr(argv[1]);
    if (-1 == connect(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr)))
    {
        perror("connect");
        return -1;
    }
    p = (struct Test *)buf;
    printf("input a b:");
    scanf("%d", &p->a);
    getchar();
    scanf("%c", &p->b);
    printf("a=%d b=%d\n", p->a, p->b);
    if (-1 == send(sockfd, p, sizeof(buf), 0))
    {
        perror("send");
        return -1;
    }
    memset(buf, 0, N);
    if ((n = recv(sockfd, buf, N, 0)) == -1)
    {
        perror("recv");
        return -1;
    }
    p = (struct Test *)buf;
    printf("a=%d b=%c", p->a, p->b);
    printf(">");
    close(sockfd);

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