《Qt开发》TCP编程之客户端程序
图1 显示界面
图2 网络助手辅助测试
1. 新建项目时要选择Network模块
2. 头文件中加入#include
声明QTcpSocket对象 QTcpSocket *tcpSocket;
声明如下函数和槽函数
void setQss();
public slots:
void currState();
void on_pBtnConn_clicked();
void on_pBtnSend_clicked();
void on_pBtnSel_clicked();
void on_pBtnSendTxt_clicked();
void recvMessage(); //接收数据
3. 在源文件构造函数中添加如下代码
setQss();
ui.lineEditIP->setText("192.168.57.138");
ui.lineEditPort->setText("7588");
tcpSocket = new QTcpSocket(this);
connect(tcpSocket, SIGNAL(readyRead()), this, SLOT(recvMessage()));
connect(tcpSocket, SIGNAL(stateChanged(QAbstractSocket::SocketState)), this, SLOT(currState()));
//源文件中其他函数
void Client::setQss()
{
//读取样式表设置样式
QString strStyleSheet = "";
QFile file("Config/StyleSheet.qss");
file.open(QFile::ReadOnly);
if (file.isOpen())
{
strStyleSheet = QLatin1String(file.readAll());
}
this->setStyleSheet(strStyleSheet);
//遍历同类控件，设置样式
//QString str1 = "QWidget{background-color:qlineargradient(spread:pad, x1:0,y1:0,x2:0,y2:1, stop:0.1 rgb(107,128,169),stop:1 rgb(1,71,133))}";
//QString str2 = "background-color: rgb(236,220,171)";
//QString str3 = "background-color:rgb(255,255,255)";
//this->setStyleSheet(str1);
//ui.plainTextEdit->setStyleSheet(str3);
//QList
//for (int i = 0; i < allpBtns.size(); i++)
//{
// allpBtns.at(i)->setStyleSheet(str2);
//}
//QList
//for (int i = 0; i < allLabels.size(); i++)
//{
// allLabels.at(i)->setStyleSheet(str2);
//}
//QList
//for (int i = 0; i < allLineEdit.size(); i++)
//{
// allLineEdit.at(i)->setStyleSheet(str3);
//}
}
//连接服务器槽函数
void Client::on_pBtnConn_clicked()
{
tcpSocket->abort(); //取消已有连接
tcpSocket->connectToHost(ui.lineEditIP->text(), ui.lineEditPort->text().toInt());
}
//连接状态发生变化时对应的槽函数
void Client::currState()
{
if (tcpSocket->state() == QAbstractSocket::UnconnectedState)
{
ui.plainTextEdit->setPlainText("The socket is not connected.");
}
if (tcpSocket->state() == QAbstractSocket::HostLookupState)
{
ui.plainTextEdit->setPlainText("The socket is performing a host name lookup.");
}
if (tcpSocket->state() == QAbstractSocket::ConnectingState)
{
ui.plainTextEdit->setPlainText("The socket has started establishing a connection.");
}
if (tcpSocket->state() == QAbstractSocket::ConnectedState)
{
ui.plainTextEdit->setPlainText("A connection is established.");
}
if (tcpSocket->state() == QAbstractSocket::ClosingState)
{
ui.plainTextEdit->setPlainText("The socket is about to close (data may still be waiting to be written).");
}
}
//客户端向服务器发送缓冲区的内容
void Client::on_pBtnSend_clicked()
{
QString sendMsg = ui.plainTextEdit->toPlainText();
tcpSocket->write(sendMsg.toUtf8());
}
//选择要发送的txt文件
void Client::on_pBtnSel_clicked()
{
QString filePath = QFileDialog::getOpenFileName(this,"选择文件", "", NULL);
ui.lineEditPath->setText(filePath);
}
//客户端向服务器发送txt文件
void Client::on_pBtnSendTxt_clicked()
{
QString filePath = ui.lineEditPath->text();
QFile file(filePath);
if (!file.open(QIODevice::ReadOnly | QIODevice::Text))
return;
int lineNum = 0;
while (!file.atEnd())
{
lineNum++;
QByteArray lineBytes = file.readLine();
tcpSocket->write(lineBytes);
}
file.close();
ui.plainTextEdit->setPlainText(QString::number(lineNum));
}
//接收服务器发来的信息
void Client::recvMessage()
{
QDataStream in(tcpSocket);
in.setVersion(QDataStream::Qt_4_6);
QByteArray recvBytes = tcpSocket->readAll();
ui.plainTextEdit->appendPlainText(recvBytes);
}