QT tcp通信下位机作为tcp服务器发出的消息获取不到

假如foreach不循环 2017-03-16 06:39:43

如题，就是下位机作为tcp的服务端，我向它发送消息，它会回复我对应的消息答复，这些通过抓包工具都能看到的，但是我在写代码的时候，总是获取不到，不清楚是哪些问题，代码下面贴出来。。。
这是头文件

#ifndef MAINWINDOW_H

#define MAINWINDOW_H



#include <QMainWindow>

#include <QTcpSocket>



namespace Ui {

class MainWindow;

}



class MainWindow : public QMainWindow

{

    Q_OBJECT



public:

    explicit MainWindow(QWidget *parent = 0);

    ~MainWindow();



private:

    Ui::MainWindow *ui;



    QTcpSocket  *m_pSocket,*m_tcpsocket;



private slots:

    void on_btnSend_clicked();

    void test();

    void on_pushButton_clicked();

    void readMessage();

};



#endif // MAINWINDOW_H

源文件

#include "mainwindow.h"

#include "ui_mainwindow.h"

#include <QMessageBox>

#include <QByteArray>

#include <QHostAddress>

#include "QDebug"

#include "QTimer"



MainWindow::MainWindow(QWidget *parent) :

    QMainWindow(parent),

    ui(new Ui::MainWindow)

{

    ui->setupUi(this);

}



MainWindow::~MainWindow()

{

    m_pSocket->disconnectFromHost();

    m_pSocket->deleteLater();

    delete ui;

}



void MainWindow::on_btnSend_clicked()

{

    m_pSocket = new QTcpSocket(this);

    QHostAddress addr;

    addr.setAddress(QObject::tr("192.168.13.200"));

    m_pSocket->connectToHost(addr, 6000);

    m_pSocket->waitForConnected();





    int i = 0;



    QMessageBox::information(this, "提示", "ready to send!");



    int iSize = 0;

    int iBufLen = 0;



    QByteArray arrBuf;

    arrBuf.resize(512);

    arrBuf[i++] = 0xFA;

    arrBuf[i++] = 0xCE;



    arrBuf[i++] = 0x00;

    arrBuf[i++] = 0x01;



    arrBuf[i++] = 0x00;

    arrBuf[i++] = 0x01; // target



    iSize = i;

    arrBuf[i++] = 0x00;

    arrBuf[i++] = 0x1C;





    arrBuf[i++] = 0x00;

    arrBuf[i++] = 0x12; // sender



    arrBuf[i++] = 0x00;

    arrBuf[i++] = 0x00;



    arrBuf[i++] = 0x00;

    arrBuf[i++] = 0x04;



    iBufLen = i;

    arrBuf[i++] = 0x00;

    arrBuf[i++] = 0x04;



    sprintf(arrBuf.data()+i, "TXML");



    i += 4;



    char *theBuf = "<Message namespace=\"ZH-606\" version=\"1.2\" type=\"request\" sequence=\"1\">"

                   "<Execute command=\"SYS_APPASSOCIATION\" enforce=\"true\"/>"

                   "</Message>";

    quint16 iTmp = strlen(theBuf);

    sprintf(arrBuf.data()+i, theBuf);

    i += iTmp;

    arrBuf[iBufLen] = (quint8)(iTmp>>8);

    arrBuf[iBufLen+1] = (quint8)(iTmp);



    arrBuf[i++] = 0x00;

    arrBuf[i++] = 0x12;//SessionId



    arrBuf[i++] = 0x00;

    arrBuf[i++] = 0x01;//SliceNum分包计数



    arrBuf[iSize] = (quint8)((i-8)>>8);

    arrBuf[iSize+1] = (quint8)(i-8);



    m_pSocket->write(arrBuf.data(), i);

}



void MainWindow::test()

{

    qDebug()<<"test";

}



void MainWindow::on_pushButton_clicked()

{

    m_tcpsocket = new QTcpSocket(this);

    m_tcpsocket->abort();

    QHostAddress addr;

    addr.setAddress("192.168.13.200");

    m_tcpsocket->connectToHost(addr,6000);

    if (m_tcpsocket->waitForConnected())

    {

        qDebug() << "connected...";

    }

    else

    {

        qDebug() << "con error.";

    }

    connect(m_tcpsocket,SIGNAL(readyRead()),

            this,SLOT(readMessage()));

}



void MainWindow::readMessage()

{

    qDebug() << "read....";

    qDebug()<<QString(m_tcpsocket->readAll().toHex());

    while(m_tcpsocket->bytesAvailable()>0)

    {

        QByteArray datagram;

        datagram.resize(m_tcpsocket->bytesAvailable());

        m_tcpsocket->read(datagram.data(),datagram.size());

        QString msg=datagram.data();

        qDebug()<<msg;

    }

}

main文件

#include "mainwindow.h"

#include <QApplication>



int main(int argc, char *argv[])

{

    QApplication a(argc, argv);

    MainWindow w;

    w.show();



    return a.exec();

}

请抽出您宝贵的时间瞅两眼，多谢

...全文