QT学习---网络编程
为了方便调试，网上找来客户端例程，修改成上位机控制端。
1、pro文件
从这里，我们可以看到，必须要在.pro文件中添加QT += network才可以进行网络编程，否则是访问不到头文件的。
客户端读写相对简单，我们看一下代码头文件：
#-------------------------------------------------
#
# Project created by QtCreator 2019-08-25T14:10:09
#
#-------------------------------------------------
QT += core gui
QT += network
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
TARGET = myFrist
TEMPLATE = app
# The following define makes your compiler emit warnings if you use
# any feature of Qt which has been marked as deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS
# You can also make your code fail to compile if you use deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0
CONFIG += c++11
SOURCES += \
clientwidget.cpp \
main.cpp \
mainwindow.cpp
HEADERS += \
clientwidget.h \
mainwindow.h
FORMS += \
clientwidget.ui \
mainwindow.ui
# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target
2、client.cpp
#include "clientwidget.h"
#include "ui_clientwidget.h"
#include
#include
#include
#include
#include
ClientWidget::ClientWidget(QWidget *parent) :
QWidget(parent),
ui(new Ui::ClientWidget)
{
ui->setupUi(this);
//初始化套接字
//tcpSocket = NULL;
//分配空间，指定父对象
tcpSocket = new QTcpSocket(this);
//建立连接的信号槽
connect(tcpSocket,&QTcpSocket::connected,
[=]()
{
ui->textEditRead->setText("恭喜，成功连接服务器！");
ui->textEditguid->setText("成功连接服务器！");
}
);
//连接建立后收到服务器数据的信号槽
connect(tcpSocket,&QTcpSocket::readyRead,
[=]()
{
//获取对方发送的内容
qint16 n =5;
QByteArray array = tcpSocket->readAll();
quint8 buf[64] = {0};
// buf[0] = array[1];
QString str1 = "Welcome";
// qint64 read(char *data, qint64 maxlen);
if(array[7] == (char)3)
{
ui->textEditRead->append("参数设置为:");
// str1.sprintf( "year:%d\tmoth:%d\tday:%d", ((quint8)array[20]+(array[19]<<8)),
// array[22]+(array[21]<<8), array[24]+(array[23]<<8));
str1.sprintf( "年:%d\t月:%d\t日:%d", ((quint8)array[20]+(array[19]<<8)),
array[22]+(array[21]<<8), array[24]+(array[23]<<8));
ui->textEditRead->append(str1);
// str1.sprintf( "V1:%d\tV2:%d\tspeed3:%d",array[10]+(array[9]<<8),
// (quint8)array[12]+(array[11]<<8), array[14]+(array[13]<<8));
str1.sprintf( "消毒桶:%d\t饮水桶:%d\t流速:%d",array[10]+(array[9]<<8),
(quint8)array[12]+(array[11]<<8), array[14]+(array[13]<<8));
ui->textEditRead->append(str1);
// str1.sprintf( "dree:%d\tweigt:%d",array[16]+(array[15]<<8),
// array[18]+(array[17]<<8));
str1.sprintf( "溶解度:%d\t药重:%d",array[16]+(array[15]<<8),
array[18]+(array[17]<<8));
ui->textEditRead->append(str1);
//sprintf(buf, "year:%d-moth:%d-day:%d", array[7], array[7], array[7]);
}else
{//显示到编辑框
ui->textEditRead->append("Recv:");
ui->textEditRead->append(array);//append，添加内容
}
}
);
//设置窗口标题
setWindowTitle("TCP客户端");
}
ClientWidget::~ClientWidget()
{
delete ui;
}
void ClientWidget::on_buttonConnect_clicked()
{
//获取服务器IP和端口
QString ip = ui->lineEditIP->text();
quint16 port = ui->lineEditPort->text().toUShort();
//主动连接服务器
tcpSocket->connectToHost(QHostAddress(ip),port);
}
void ClientWidget::on_buttonSend_clicked()
{
//获取编辑框内容
QString str = ui->textEditWrite->toPlainText();
//发送数据
tcpSocket->write( str.toUtf8().data() );
}
void ClientWidget::on_buttonClose_clicked()
{ //主动断开连接
tcpSocket->disconnectFromHost();
ui->textEditguid->setText("已断开连接！");
}
QByteArray InnitialQByteArry(qint8 in[],int len)//输入int数组和数组长度，将数组中的值存入QByteArry中
{
QByteArray byteArry;
byteArry.resize(len);
for (int i=0;iwrite( str.toUtf8().data() );
qint8 buf[43] = {0x00,0x00,0x00,0x00,0x00,0x06,0x01,0x10,0x00,0x00,0x00,0x10,0x20};
num = ui->lineEditset1->text().toShort();
buf[n+0] = num>>8;
buf[n+1] =(qint8) num;
num = ui->lineEditset2->text().toShort();
buf[n+2] = num>>8;
buf[n+3] =(qint8) num;
num = ui->lineEditset3->text().toShort();
buf[n+4] = num>>8;
buf[n+5] =(qint8) num;
num = ui->lineEditset4->text().toShort();
buf[n+6] = num>>8;
buf[n+7] =(qint8) num;
num = ui->lineEditset5->text().toShort();
buf[n+8] = num>>8;
buf[n+9] =(qint8) num;
num = ui->lineEditset6->text().toShort();
buf[n+10] = num>>8;
buf[n+11] =(qint8) num;
num = ui->lineEditset7->text().toShort();
buf[n+12] = num>>8;
buf[n+13] =(qint8) num;
num = ui->lineEditset7_2->text().toShort();
buf[n+14] = num>>8;
buf[n+15] =(qint8) num;
num = ui->lineEditset8->text().toShort();
buf[n+16] = num>>8;
buf[n+17] =(qint8) num;
num = ui->lineEditset8_2->text().toShort();
buf[n+18] = num>>8;
buf[n+19] =(qint8) num;
num = ui->lineEditset9->text().toShort();
buf[n+20] = num>>8;
buf[n+21] =(qint8) num;
num = ui->lineEditset9_2->text().toShort();
buf[n+22] = num>>8;
buf[n+23] =(qint8) num;
num = ui->lineEditset10->text().toShort();
buf[n+24] = num>>8;
buf[n+25] =(qint8) num;
num = ui->lineEditset10_2->text().toShort();
buf[n+26] = num>>8;
buf[n+27] =(qint8) num;
//lineEditset7_2
num = 0;
if(ui->checkBox_1->isChecked() ){
qDebug("checkBox_1");
num |= 1;
}
if(ui->checkBox_2->isChecked() ){
qDebug("checkBox_2");
num |= 1<<1;
}
if(ui->checkBox_3->isChecked() ){
qDebug("checkBox_3");
num |= 1<<2;
}
if(ui->checkBox_4->isChecked() ){
qDebug("checkBox_4");
num |= 1<<3;
}
if(ui->checkBox_5->isChecked() ){
qDebug("checkBox_5");
num |= 1<<4;
}
if(ui->checkBox_6->isChecked() ){
qDebug("checkBox_6");
num |= 1<<5;
}
// qDebug()<<"num:";
// qDebug()<>8;
buf[n+29] =(qint8) num;
int siz =sizeof(buf)/sizeof(buf[0]);
QByteArray sendM=InnitialQByteArry(buf,siz);
tcpSocket->write( sendM);
}
void ClientWidget::on_buttonRead_clicked()
{
// qint16 addr = ui->lineEditAddr->text().toShort();
/// qint16 num = ui->lineEditNum->text().toShort();
//发送数据
//tcpSocket->write( str.toUtf8().data() );
qint8 buf[12] = {0x00,0x00,0x00,0x00,0x00,0x06,0x01,0x03,0x00,0x00,0x00,0x20};
// buf[8] = addr>>8;
// buf[9] =(qint8) addr;
// buf[10] = num>>8;
// buf[11] =(qint8) num;
int siz =sizeof(buf)/sizeof(buf[0]);
QByteArray sendM=InnitialQByteArry(buf,siz);
tcpSocket->write( sendM);
ui->textEditRead->setText("读取设置内容为：");
}
3、UI文件
ClientWidget
0
0
946
641
0
300
Form
-
450
580
450
560
数据读写
true
20
30
400
500
0
0
400
500
400
500
2
0
微软雅黑
50
false
数据设置
30
30
100
30
100
20
100
30
微软雅黑
10
50
false
消毒桶体积：
130
30
71
21
45
210
60
100
30
100
20
100
30
微软雅黑
10
50
false
药物重量：
130
70
71
21
1000
260
390
93
71
参数设置
30
90
100
30
100
20
100
30
微软雅黑
10
50
false
水泵流量：
30
60
100
30
100
20
100
30
微软雅黑
10
50
false
饮水桶体积：
220
30
100
30
100
20
100
30
微软雅黑
10
50
false
稀释度：
130
100
71
21
5
300
30
71
21
2
300
70
71
21
10000
30
140
100
30
100
20
100
30
微软雅黑
10
50
false
加药年月日：
130
150
51
21
2019
190
150
51
21
8
30
210
100
30
100
20
100
30
微软雅黑
10
50
false
限制时间1止：
140
220
51
21
12
140
190
51
21
9
30
180
100
30
100
20
100
30
微软雅黑
10
50
false
限制时间1起：
140
250
51
21
14
30
240
100
30
100
20
100
30
微软雅黑
10
50
false
限制时间2起：
250
150
51
21
26
200
190
51
21
00
200
220
51
21
30
200
250
51
21
30
30
320
91
19
微软雅黑
10
50
false
1单元
30
350
91
19
微软雅黑
10
50
false
2单元
30
380
91
19
微软雅黑
10
50
false
3单元
30
410
91
19
微软雅黑
10
50
false
4单元
30
440
91
19
微软雅黑
10
50
false
5单元
30
470
91
19
微软雅黑
10
50
false
6单元
20
280
120
30
120
20
100
30
微软雅黑
10
50
false
喂药单元选择：
-
300
560
连接
20
250
430
300
430
300
430
300
数据显示
20
20
331
200
16777215
200
true
20
230
331
51
16777215
100
360
230
71
51
发送数据
360
20
71
51
读取参数
20
20
421
200
400
200
16777215
200
连接
210
40
93
28
连接服务器
20
30
100
30
100
20
100
30
服务器端口：
120
40
71
21
502
20
80
93
21
服务器IP：
110
80
254
31
192.168.0.200
20
120
100
30
100
20
100
30
连接状态：
110
120
201
31
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN" "http://www.w3.org/TR/REC-html40/strict.dtd">
<html><head><meta name="qrichtext" content="1" /><style type="text/css">
p, li { white-space: pre-wrap; }
</style></head><body style=" font-family:'SimSun'; font-size:9pt; font-weight:400; font-style:normal;">
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">未连接</p></body></html>
310
40
93
28
关闭连接