QT编写tcp通信工具(Client篇) QT编写tcp通信工具(Client篇)

本文实例为大家分享了QT编写tcp通信工具的具体实现代码，Client篇，供大家参考，具体内容如下
1.说明
使用qt写一个类似网上常见的网络调试工具。此篇为Client端。下一遍再写Server端。

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2.基本流程
Client端相对简单：创建QTcpSocket对象，为对象的readyRead，error，connected（可选）分别写槽函数，以处理读数据，错误，连接成功三个事件。
连接使用对象的connectToHost方法，断开使用disconnectFromHost方法。
程序不做编码转换处理，因为之前的几遍文字已经做过，不再赘述。
3.代码
这是mainwindow.cpp文件。

#include "mainwindow.h"#include "ui_mainwindow.h" MainWindow::MainWindow(QWidget *parent) :QMainWindow(parent),ui(new Ui::MainWindow){ui->setupUi(this); ui->splitter->setStretchFactor(0,2); ui->splitter->setStretchFactor(1,1); QString ip=getLocalip(); if( ip.isEmpty() ){QMessageBox::about(this,tr("提示"),tr("无本地IP。") ) ; }else{ui->ledtIpLocal->setText( ip ); //本地IP}ui->labHostName->setText(tr("HostName:")+ QHostInfo::localHostName() ); ui->labHostName->adjustSize(); ui->ledtPortServer->setText(tr("8080")); //默认ui->ledtIpServer->setText (ui->ledtIpLocal->text() ); ui->btnOpen->setEnabled(true); ui->btnSend->setEnabled(false); //初始化TCP客户端tcpClient = new QTcpSocket(this); tcpClient->abort(); connect(tcpClient, SIGNAL(readyRead()), this, SLOT(slot_readData()) ); connect(tcpClient, SIGNAL(connected()), this, SLOT(slot_connected()) ); connect(tcpClient, SIGNAL(error(QAbstractSocket::SocketError)),this, SLOT(slot_error(QAbstractSocket::SocketError))); } MainWindow::~MainWindow(){delete ui; }//获取本地IPQString MainWindow::getLocalip(){QList list = QNetworkInterface::allAddresses(); foreach (QHostAddress address, list){if(address.protocol() == QAbstractSocket::IPv4Protocol){return address.toString(); }}return ""; } //读取数据void MainWindow::slot_readData(){QByteArray buffer = tcpClient->readAll(); if(!buffer.isEmpty()){ui->tedtRecive->appendPlainText( buffer ); }}//连接成功，也可以在方法waitForConnected后面处理。void MainWindow::slot_connected(){ui->btnOpen->setText("断开"); ui->btnSend->setEnabled(true); ui->btnOpen->setEnabled(true); ui->ledtPortLocal->setText( QString::number(tcpClient->localPort()) ); }//错误处理voidMainWindow::slot_error(QAbstractSocket::SocketError){tcpClient->disconnectFromHost(); ui->btnOpen->setText(tr("连接")); ui->btnOpen->setEnabled(true); QMessageBox::warning(this,tr("注意！"),tcpClient->errorString(),QMessageBox::Ok ,QMessageBox::Ok) ; }//连接与断开void MainWindow::on_btnOpen_clicked(){if(ui->btnOpen->text() == "断开"){tcpClient->disconnectFromHost(); if (tcpClient->state() == QAbstractSocket::UnconnectedState \||(tcpClient->waitForDisconnected(1000))){ui->btnOpen->setText("连接"); ui->btnSend->setEnabled(false); }}else{if(ui->ledtPortServer->text().toInt() ==0 ){QMessageBox::about(this,tr("提示"),tr("请输入端口号。") ) ; return; }tcpClient->connectToHost(ui->ledtIpServer->text(), ui->ledtPortServer->text().toInt(),QIODevice::ReadWrite,QAbstractSocket::IPv4Protocol); ui->btnOpen->setEnabled(false); if( !tcpClient->waitForConnected(4000) ) //只等待4秒{tcpClient->disconnectFromHost(); ui->btnOpen->setText(tr("连接")); ui->btnOpen->setEnabled(true); QMessageBox::warning(this,tr("注意！"),tcpClient->errorString(),QMessageBox::Ok ,QMessageBox::Ok) ; }}}//发送void MainWindow::on_btnSend_clicked(){if(ui->tedtSend->toPlainText().isEmpty() ){QMessageBox::about(this,tr("提示"),tr("请输入发送数据。")) ; return; } tcpClient ->write( ui->tedtSend->toPlainText().toUtf8() ); }

4.附加修改
使用中发现qt文本框对回车键按“\n”处理，即使是从其他地方粘贴进来也会自动将“\r\n”转为“\n”,这有时非常不方便，比如测试wifi模块的AT命令，还有一些固定格式的网络请求。
先对界面进行修改，添加一些功能物件：

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这里对发送数据进行处理：

//发送void MainWindow::on_btnSend_clicked(){ if(ui->tedtSend->toPlainText().isEmpty() ){QMessageBox::about(this,tr("提示"),tr("请输入发送数据。")) ; return; }QString str = ui->tedtSend->toPlainText() ; if( ui->checkBox2->isChecked() ){str.replace(tr("\n"),tr("\r\n")); str.replace(tr("\n\n"),tr("\n")); }if( ui->checkBox1->isChecked() )str.append(tr("\r\n")); tcpClient ->write( str.toUtf8() ); }//计算字节数void MainWindow::on_btnCalc_clicked(){QString str = ui->tedtSend->toPlainText() ; int len1= str.toUtf8().length(); if( ui->checkBox2->isChecked() ){str.replace(tr("\n"),tr("\r\n")); str.replace(tr("\n\n"),tr("\n")); }if( ui->checkBox1->isChecked() )str.append(tr("\r\n")); int len2= str.toUtf8().length(); QMessageBox::about(this,tr("字节："),tr("处理前:")+QString::number (len1,10)+tr("，处理后：")+ QString::number (len2,10)) ; }

为了更加方便使用，添加记忆功能，保持上次的填写的内容：

//读取ini文件对应信息void MainWindow:: readIni(QString key, QString&value){QString path = "save.ini"; //创建文件QSettings *config = new QSettings(path, QSettings::IniFormat); //读取信息QVariant variant = config->value(QString("info/") + key); value = https://www.it610.com/article/variant.value(); delete config; } //写入ini文件对应信息void MainWindow::writeIni(QString key, QString value){QString path = "save.ini"; //创建文件QSettings *config = new QSettings(path, QSettings::IniFormat); QVariant variant; variant.setValue(value); //信息写入文件config->beginGroup("info"); config->setValue(key, variant); config->endGroup(); delete config; }

【QT编写tcp通信工具(Client篇)】以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。