去年做的基于QT的温湿度监测系统，这是在QT端运行的完整代码 -

#include "widget.h"
#include "ui_widget.h"
#include <QHostAddress>
#define WNDTITLE "智能家居温湿度监测系统"
Widget::Widget(QWidget *parent) :
QWidget(parent),
ui(new Ui::Widget)
{
ui->setupUi(this);
//分配一个套接字对象
s = new QTcpSocket(this);
//关联信号槽
connect(s, SIGNAL(connected()),
this, SLOT(slotConnected()));
connect(s, SIGNAL(disconnected()),
this, SLOT(slotDisconnected()));
connect(s, SIGNAL(error(QAbstractSocket::SocketError)),
this, SLOT(slotError()));
connect(s, SIGNAL(readyRead()),
this, SLOT(slotReadyRead()));
//设置窗口标题
setWindowTitle(WNDTITLE);
}
Widget::~Widget()
{
delete ui;
}
void Widget::slotConnected()
{
//修改按钮显示的文本：设置按钮标题
ui->pushButton->setText("连接成功");
//修改窗口标题
setWindowTitle(QString(WNDTITLE)+"-连接成功");
}
void Widget::slotDisconnected()
{
//按钮变亮：按钮使能
ui->pushButton->setEnabled(true);
//修改按钮显示的文本：设置按钮标题
ui->pushButton->setText("连接");
//修改窗口标题
setWindowTitle(QString(WNDTITLE)+"-"+s->errorString());
}
void Widget::slotError()
{
//按钮变亮：按钮使能
ui->pushButton->setEnabled(true);
//修改按钮显示的文本：设置按钮标题
ui->pushButton->setText("连接");
//修改窗口标题
setWindowTitle(QString(WNDTITLE)+"-"+s->errorString());
}
void Widget::slotReadyRead()
{
//服务器每秒发4字节
//温度值： 1字节(整数位).0字节(小数位)
//温度值： 3字节(整数位).2字节(小数位)
if(s->bytesAvailable() >= 4){ //判断套接字缓存是否大于等于4bytes
//定义4字节数组
char buffer[4];
//从套接字缓存读出4字节
s->read(buffer, 4);
QString temp;
//格式化字符串：显示温度值
temp.sprintf("温度值：%d.%d", buffer[1], buffer[0]);
ui->tempLB->setText(temp);
QString hum;
//格式化字符串：显示湿度值
hum.sprintf("湿度值：%d.%d", buffer[3], buffer[2]);
ui->humLB->setText(hum);
}
}
void Widget::on_pushButton_clicked()
{
//定义一个字符串对象
QString ip;
//把行编辑器上的文本保存到ip
ip = ui->lineEdit->text();
s->connectToHost(QHostAddress(ip), 59999);
//按钮变灰：按钮失效
ui->pushButton->setEnabled(false);
//修改按钮显示的文本：设置按钮标题
ui->pushButton->setText("连接中...");
//修改窗口标题
setWindowTitle(QString(WNDTITLE)+"-连接中...");
}
透传服务器main函数：
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include "serial.h"
int init_server(ushort port, int num)
{
int s = socket(AF_INET, SOCK_STREAM, 0);
if(0 > s){
perror("socket");
return -1;
}
struct sockaddr_in addr = {
.sin_family = AF_INET,
.sin_port = htons(port),
.sin_addr = {
.s_addr = INADDR_ANY,
},
};
socklen_t len = 16;
if(0 > bind(s, (struct sockaddr *)&addr, len)){
perror("bind");
goto ERR_STEP;
}
if(0 > listen(s, num)){
perror("listen");
goto ERR_STEP;
}
return s;
ERR_STEP:
close(s);
return -1;
}
int main()
{
int fd = init_serial("/dev/ttyUSB0", B115200, 'n', 8, 1);
if(0 > fd){
return -1;
}
printf("init M0 device done.\n");
int s = init_server(59999, 10);
if(0 > s){
return -1;
}
printf("Wait for a client ...\n");
int rws = accept(s, NULL, NULL);
if(0 > rws){
perror("accept");
return -1;
while(1){
char buf[36];
int len = 36;
char *p = buf;
while(len){
int size = recv_serial(fd, p, len, 300000);
if(0 > size){
return -1;
}
len -= size;
p += size;
}
printf("temp: %d.%d\n", buf[5], buf[4]);
printf(" hum: %d.%d\n", buf[7], buf[6]);
if(4 != write(rws, buf+4, 4)){
printf("snd temp & hum fail.\n");
return -1;
}
}
return 0;
}

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