QLocalServer与QLocalSocket进程通讯

在Qt中，提供了多种IPC方法，作者所用的是QLocalServer和QLocalSocket。看起来好像和Socket搭上点边，实则底层是windows的name pipe。这应该是支持双工通信的。

一 QLocalServer

#ifndef VXMAINWINDOW_H
#define VXMAINWINDOW_H

#include <QWidget>
#include <QtNetwork/QLocalServer>
#include <QtNetwork/QLocalSocket>

class QPushButton;
class QTextEdit;

class CVxMainWindow : public QWidget
{
 Q_OBJECT

public:
 CVxMainWindow(QWidget *parent=NULL);
 ~CVxMainWindow();
protected:
 void resizeEvent(QResizeEvent *);
private slots:
 void Btn_ListenClickedSlot();
 void Btn_StopListenClickedSlot();
 void newConnectionSlot();
 void dataReceived();
private:
 QLocalServer *m_pServer;
 QLocalSocket *m_pSocket;

QPushButton *m_pBtn_Listen;
 QPushButton *m_pBtn_StopListen;
 QTextEdit   *m_pEdt_Info;
};

#endif // VXMAINWINDOW_H

#include "VxMainWindow.h"

#include <QtGui/QtGui>

CVxMainWindow::CVxMainWindow(QWidget *parent)
 : QWidget(parent)
{
 m_pBtn_Listen     = new QPushButton(QObject::tr("开始监听"), this);
 m_pBtn_StopListen = new QPushButton(QObject::tr("停止监听"), this);
 m_pEdt_Info       = new QTextEdit(this);
 m_pServer         = new QLocalServer(this);

connect(m_pBtn_Listen,     SIGNAL(clicked()), this, SLOT(Btn_ListenClickedSlot()));
 connect(m_pBtn_StopListen, SIGNAL(clicked()), this, SLOT(Btn_StopListenClickedSlot()));
 connect(m_pServer,         SIGNAL(newConnection()), this, SLOT(newConnectionSlot()));
}

CVxMainWindow::~CVxMainWindow()
{

}

void CVxMainWindow::resizeEvent(QResizeEvent *)
{
 m_pBtn_Listen->setGeometry(10, 5, 80, 20);
 m_pBtn_StopListen->setGeometry(100, 5, 80, 20);
 m_pEdt_Info->setGeometry(0, 30, width(), height() - 30);
}

void CVxMainWindow::Btn_ListenClickedSlot()
{
 if (!m_pServer->isListening())
 {
  if (m_pServer->listen(QObject::tr("AAA"))) 
  {
   m_pEdt_Info->append(QObject::tr("打开监听端口成功！"));
  }
  else
  {
   m_pEdt_Info->append(QObject::tr("打开监听端口失败！"));
  }
 }
 else
 {
  m_pEdt_Info->append(QObject::tr("正在监听中...！"));
 }
}

void CVxMainWindow::Btn_StopListenClickedSlot()
{
 if (m_pServer->isListening())
 {
  m_pServer->close();
  m_pEdt_Info->append(QObject::tr("停止监听！"));
 }
}

void CVxMainWindow::newConnectionSlot()
{
 m_pEdt_Info->append(QObject::tr("有新客户端连接到服务器"));
 m_pSocket = m_pServer->nextPendingConnection();
 connect(m_pSocket, SIGNAL(disconnected()), m_pSocket, SLOT(deleteLater()));
 connect(m_pSocket, SIGNAL(readyRead()),this, SLOT(dataReceived()));

int length = 0;
 QString vMsgStr = QObject::tr("Welcome");
 if((length=m_pSocket->write(vMsgStr.toLatin1(),vMsgStr.length()))!=vMsgStr.length())
 {

}
}

void CVxMainWindow::dataReceived()
{
 while(m_pSocket->bytesAvailable())
 {       
  QString vTemp;
  vTemp = m_pSocket->readLine();          
  m_pEdt_Info->append(vTemp);

int length = 0;
  QString vMsgStr = QObject::tr("回复：") + vTemp;
  if((length=m_pSocket->write(vMsgStr.toLatin1(),vMsgStr.length()))!=vMsgStr.length())
  {

}
 }
}

二 QLocalSocket

#ifndef VXMAINWINDOW_H
#define VXMAINWINDOW_H

#include <QWidget>
#include <QtNetwork/QLocalSocket>

class QPushButton;
class QTextEdit;
class QLineEdit;

class CVxMainWindow : public QWidget
{
 Q_OBJECT

public:
 CVxMainWindow(QWidget *parent=NULL);
 ~CVxMainWindow();
protected:
 void resizeEvent(QResizeEvent *);
 private slots:
  void Btn_ConnectClickedSlot();
  void Btn_DisConnectClickedSlot();
  void Btn_SendClickedSlot();
  void connectedSlot();
  void disconnectedSlot();
  void dataReceived();
  void displayError(QAbstractSocket::SocketError);
private:
 QLocalSocket *m_pSocket;

QPushButton *m_pBtn_Connect;
 QPushButton *m_pBtn_DisConnect;
 QTextEdit   *m_pEdt_Info;
 QLineEdit   *m_pEdt_Send;
 QPushButton *m_pBtn_Send;
};

#endif // VXMAINWINDOW_H

#include "VxMainWindow.h"

#include <QtGui/QtGui>

CVxMainWindow::CVxMainWindow(QWidget *parent)
 : QWidget(parent)
{
 m_pBtn_Connect    = new QPushButton(QObject::tr("连接服务器"), this);
 m_pBtn_DisConnect = new QPushButton(QObject::tr("断开连接"), this);
 m_pEdt_Send       = new QLineEdit(this);
 m_pBtn_Send       = new QPushButton(QObject::tr("发送"), this);
 m_pEdt_Info = new QTextEdit(this);
 m_pSocket = new QLocalSocket(this);

connect(m_pBtn_Connect,    SIGNAL(clicked()), this, SLOT(Btn_ConnectClickedSlot()));
 connect(m_pBtn_DisConnect, SIGNAL(clicked()), this, SLOT(Btn_DisConnectClickedSlot()));
 connect(m_pBtn_Send,       SIGNAL(clicked()), this, SLOT(Btn_SendClickedSlot()));
 connect(m_pSocket, SIGNAL(connected()), this, SLOT(connectedSlot()));
 connect(m_pSocket, SIGNAL(disconnected()), this, SLOT(disconnectedSlot()));
 connect(m_pSocket, SIGNAL(readyRead()),this, SLOT(dataReceived()));
 connect(m_pSocket, SIGNAL(error(QAbstractSocket::SocketError)), this, SLOT(displayError(QAbstractSocket::SocketError)));
}

CVxMainWindow::~CVxMainWindow()
{

}

void CVxMainWindow::resizeEvent(QResizeEvent *)
{
 m_pBtn_Connect->setGeometry(10, 5, 80, 20);
 m_pBtn_DisConnect->setGeometry(100, 5, 80, 20);
 m_pEdt_Send->setGeometry(10, 30, 150, 20);
 m_pBtn_Send->setGeometry(170, 30, 80, 20);
 m_pEdt_Info->setGeometry(0, 60, width(), height() - 60);
}

void CVxMainWindow::Btn_ConnectClickedSlot()
{
 m_pSocket->connectToServer(QObject::tr("AAA"));
}

void CVxMainWindow::Btn_DisConnectClickedSlot()
{
 m_pSocket->disconnectFromServer();
}

void CVxMainWindow::Btn_SendClickedSlot()
{
 int length = 0;
 QString vMsgStr = m_pEdt_Send->text();
 if((length=m_pSocket->write(vMsgStr.toLatin1(),vMsgStr.length()))!=vMsgStr.length())
 {
  m_pEdt_Info->append(QObject::tr("发送信息失败：") + vMsgStr);
 }
}

void CVxMainWindow::connectedSlot()
{
 m_pEdt_Info->append(QObject::tr("成功连接到服务器！"));
}

void CVxMainWindow::disconnectedSlot()
{
 m_pEdt_Info->append(QObject::tr("断开与服务器的连接！"));
}

void CVxMainWindow::dataReceived()
{
 while(m_pSocket->bytesAvailable())
 {       
  QString vTemp;
  vTemp = m_pSocket->readLine();          
  m_pEdt_Info->append(vTemp);
 }
}

void CVxMainWindow::displayError(QAbstractSocket::SocketError)
{

}