qtcpsocket 客户端_qtcpsocket接收结构体数据

#pragma once

#include <QObject>
#include <QTcpSocket>
/**********************************************
* 作者：wujianhua
* 时间：2021/02/25
* 类介绍：socket tcp客户端通信类
*
***********************************************/
class TcpClient : public QObject
{
	Q_OBJECT

public:
	TcpClient(QObject *parent);
	~TcpClient();
	
	/**********************************************
	* 作者：wujianhua
	* 时间：2021/02/25
	* 函数：连接服务器
	* 参数：
	*	ip：服务器地址
	*	port：服务器端口
	*	timeout：超时时间
	* 返回：
	*	连接成功返回true，失败返回false
	***********************************************/
	bool connect(const QString ip, int port, int timeout = 3000);

	/**********************************************
	* 作者：wujianhua
	* 时间：2021/02/25
	* 函数：断开服务器连接
	* 参数：
	*	无
	* 返回：
	*	无
	***********************************************/
	void disconnect();
	
	/**********************************************
	* 作者：wujianhua
	* 时间：2021/02/25
	* 函数：是否连接
	* 参数：
	*	无
	* 返回：
	*	返回true为连接状态，false为断开状态
	***********************************************/
	bool isOnline();
	
	/**********************************************
	* 作者：wujianhua
	* 时间：2021/02/25
	* 函数：发送数据
	* 参数：
	*	dat：数据对象
	* 返回：
	*	发送成功返回对应发的字节数，-1设备未连接
	***********************************************/
	int send(QByteArray dat);
	
	/**********************************************
	* 作者：wujianhua
	* 时间：2021/02/25
	* 函数：接收设备发送过来的数据
	* 参数：
	*	buf：接收设备发送的数据缓存
	*	timeout：超时时间
	* 返回：
	*	返回接收到的数据字节数，-1设备未连接
	***********************************************/
	int recv(QByteArray &buf, int timeout = 10*1000);

	/**********************************************
	* 作者：wujianhua
	* 时间：2021/03/02
	* 函数：设置心跳保活机制
	* 参数：
	*	keepIdle：没有数据交互后发送心跳探测包 单位秒
	*	keepInterval：探测包间隔时间 单位秒
	*	keepCount：探测重试次数
	* 返回：
	*	无
	***********************************************/
	void setKeepAlive(int keepIdle = 2, int keepInterval = 1, int keepCount = 3);

private slots:
	void slot_connected();
	void slot_readData();
	void slot_disconnected();
	void slot_stateChange(QAbstractSocket::SocketState state);
private:
	QTcpSocket *_tcp = nullptr;
	QString _ip;
	int _port;
	bool _online = false;
	QByteArray _readbuf;
};

#include "TcpClient.h"
#include <QSettings>
#include <QDebug>
#ifdef Q_OS_WIN
#include <WinSock2.h>
#include <WS2tcpip.h>
#include <ws2ipdef.h>
#include <mstcpip.h>
#include <winsock.h>
#pragma comment(lib, "Ws2_32.lib")
#endif // Q_OS_WIN
#ifdef Q_OS_LINUX
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <errno.h>
#include <netinet/tcp.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <fcntl.h>
#endif // Q_OS_LINUX
TcpClient::TcpClient(QObject *parent)
: QObject(parent){
_tcp = new QTcpSocket(this);
QObject::connect(_tcp, &QAbstractSocket::connected, this, &TcpClient::slot_connected);
QObject::connect(_tcp, &QIODevice::readyRead, this, &TcpClient::slot_readData);
QObject::connect(_tcp, &QAbstractSocket::disconnected, this, &TcpClient::slot_disconnected);
QObject::connect(_tcp, &QAbstractSocket::stateChanged, this, &TcpClient::slot_stateChange);
}
TcpClient::~TcpClient() {
disconnect();
delete _tcp;
_tcp = nullptr;
}
bool TcpClient::connect(const QString ip, int port, int timeout /*= 3000*/){
disconnect();
_tcp->abort();
_ip = ip;
_port = port;
_tcp->connectToHost(_ip, _port);
_tcp->waitForConnected(timeout);
if (_online) {
setKeepAlive();
}
return _online;
}
void TcpClient::disconnect(){
if (_online) {
_tcp->disconnectFromHost();
}
}
bool TcpClient::isOnline(){
return _online;
}
int TcpClient::send(QByteArray dat){
int size = -1;
if (_online) {
size = _tcp->write(dat);
_tcp->flush();
}
return size;
}
int TcpClient::recv(QByteArray &buf, int timeout /* = 10*1000 */){
int size = -1;
if (_online) {
_tcp->waitForReadyRead(timeout);
size = _readbuf.size();
buf = _readbuf;
}
return size;
}
void TcpClient::setKeepAlive(int keepIdle /* = 2 */, int keepInterval /* = 1 */, int keepCount /* = 3 */){
//设置keepAlive心跳检测
int fd = _tcp->socketDescriptor();
int keepAlive = 1;		//开启keepAlive属性
setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (char*)&keepAlive, sizeof(keepAlive));
setsockopt(fd, IPPROTO_TCP, TCP_KEEPALIVE, (char*)&keepIdle, sizeof(keepIdle));
setsockopt(fd, IPPROTO_TCP, TCP_KEEPINTVL, (char*)&keepInterval, sizeof(keepInterval));
setsockopt(fd, IPPROTO_TCP, TCP_KEEPCNT, (char*)&keepCount, sizeof(keepCount));
}
void TcpClient::slot_connected(){
_online = true;
}
void TcpClient::slot_readData(){
_readbuf = _tcp->readAll();
}
void TcpClient::slot_disconnected(){
_online = false;
}
void TcpClient::slot_stateChange(QAbstractSocket::SocketState state){
switch (state){
case QAbstractSocket::UnconnectedState:
_online = false;
break;
case QAbstractSocket::ConnectedState:
_online = true;
break;
default:
break;
}
}