我的QTcpSocket里面有一个QMainWindow。我需要将connected()，disconnected()和readyRead()信号转发给QMainWindow。只需将套接字信号连接到我的自定义类插槽，这样做非常简单。然后从我的自定义类向我的主窗口插槽发出信号，对吗？我这样做但无济于事。即使从主窗口插槽运行emit client->sendData("data")也是如此。我获得了成功的SIGNAL / SLOT连接。但是当从我的自定义类中发出这些时，我得不到任何数据传递。这是我的相关代码：
Mainwindow.cpp：
#include "mainwindow.h"
#include "ui_mainwindow.h"
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
client = new Client(this);
qDebug() << "1st success = " << connect(client, &Client::sendData, this, &MainWindow::dataReady);
qDebug() << "2nd success = " << connect(client, &Client::clientConnected, this, &MainWindow::clientConnected);
qDebug() << "3rd success = " << connect(client, &Client::clientDisconnected, this, &MainWindow::clientDisconnected);
emit client->sendData("Hello!");
}
MainWindow::~MainWindow()
{
}
void MainWindow::on_pushButtonConnect_clicked()
{
if (isConnected)
client->disconnect();
if (client)
client->connectToServer(ui->lineEditServerIp->text(), ui->lineEditServerPort->text().toInt());
}
void MainWindow::on_pushButtonDisconnect_clicked()
{
client->disconnectToServer();
}
void MainWindow::dataReady(QByteArray data)
{
qDebug() << data;
}
void MainWindow::clientConnected()
{
isConnected = true;
ui->lineEditServerIp->setEnabled(false);
ui->lineEditServerPort->setEnabled(false);
ui->pushButtonConnect->setEnabled(false);
ui->pushButtonDisconnect->setEnabled(true);
}
void MainWindow::clientDisconnected()
{
isConnected = false;
ui->lineEditServerIp->setEnabled(true);
ui->lineEditServerPort->setEnabled(true);
ui->pushButtonConnect->setEnabled(true);
ui->pushButtonDisconnect->setEnabled(false);
}
MainWindow.h：
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include "client.h"
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
public slots:
void dataReady(QByteArray data);
void clientConnected();
void clientDisconnected();
private slots:
void on_pushButtonConnect_clicked();
void on_pushButtonDisconnect_clicked();
private:
Ui::MainWindow *ui;
Client *client;
bool isConnected;
};
#endif // MAINWINDOW_H
Client.cpp：
#include "client.h"
Client::Client(QObject *parent) : QObject(parent)
{
socket = new QTcpSocket(this);
connect(socket, SIGNAL(connected()), this, SLOT(connected()));
connect(socket, SIGNAL(disconnected()), this, SLOT(disconected()));
connect(socket, SIGNAL(bytesWritten(qint64)), this, SLOT(bytesWritten(qint64)));
connect(socket, SIGNAL(readyRead()), this, SLOT(readyRead()));
}
bool Client::connectToServer(QString ipAddress, int port)
{
if (socket && socket->state() != QAbstractSocket::ConnectedState)
{
qDebug() << "Now connecting to:" << ipAddress << ":" << port;
socket->connectToHost(ipAddress, port);
if (!socket->waitForConnected(3000))
{
qDebug() << "Connection error: " << socket->errorString();
return false;
}
else
{
qDebug() << "Successfully connected!";
return true;
}
}
else if (!socket)
{
qDebug() << "Socket unitialized.";
return false;
}
else if (socket->state() == QAbstractSocket::ConnectedState)
{
qDebug() << "Socket already connect to" << socket->peerName() << ".";
return false;
}
return false;
}
void Client::disconnectToServer()
{
socket->disconnectFromHost();
}
void Client::connected()
{
qDebug() << "Successfully connected.";
emit this->clientConnected();
}
void Client::disconected()
{
qDebug() << "Disconnected from server.";
emit this->clientDisconnected();
}
void Client::bytesWritten(qint64 bytes)
{
qDebug() << bytes;
}
void Client::readyRead()
{
QByteArray data = socket->readAll();
qDebug() << "Server: " << data;
emit this->sendData(data);
}
Client.h：
#ifndef CLIENT_H
#define CLIENT_H
#include <QTcpServer>
#include <QTcpSocket>
#include <QDebug>
class Client : public QObject
{
Q_OBJECT
public:
explicit Client(QObject *parent = nullptr);
bool connectToServer(QString ipAddress, int port);
void disconnectToServer();
signals:
void sendData(QByteArray data);
void clientConnected();
void clientDisconnected();
public slots:
void connected();
void disconected();
void bytesWritten(qint64 bytes);
void readyRead();
private:
QTcpSocket *socket;
};
#endif // CLIENT_H
Moc_client.cpp：
/****************************************************************************
** Meta object code from reading C++ file 'client.h'
**
** Created by: The Qt Meta Object Compiler version 67 (Qt 5.9.0)
**
** WARNING! All changes made in this file will be lost!
*****************************************************************************/
#include "../../FLClient/client.h"
#include <QtCore/qbytearray.h>
#include <QtCore/qmetatype.h>
#if !defined(Q_MOC_OUTPUT_REVISION)
#error "The header file 'client.h' doesn't include <QObject>."
#elif Q_MOC_OUTPUT_REVISION != 67
#error "This file was generated using the moc from 5.9.0. It"
#error "cannot be used with the include files from this version of Qt."
#error "(The moc has changed too much.)"
#endif
QT_BEGIN_MOC_NAMESPACE
QT_WARNING_PUSH
QT_WARNING_DISABLE_DEPRECATED
struct qt_meta_stringdata_Client_t {
QByteArrayData data[9];
char stringdata0[86];
};
#define QT_MOC_LITERAL(idx, ofs, len) \
Q_STATIC_BYTE_ARRAY_DATA_HEADER_INITIALIZER_WITH_OFFSET(len, \
qptrdiff(offsetof(qt_meta_stringdata_Client_t, stringdata0) + ofs \
- idx * sizeof(QByteArrayData)) \
)
static const qt_meta_stringdata_Client_t qt_meta_stringdata_Client = {
{
QT_MOC_LITERAL(0, 0, 6), // "Client"
QT_MOC_LITERAL(1, 7, 8), // "sendData"
QT_MOC_LITERAL(2, 16, 0), // ""
QT_MOC_LITERAL(3, 17, 4), // "data"
QT_MOC_LITERAL(4, 22, 15), // "clientConnected"
QT_MOC_LITERAL(5, 38, 18), // "clientDisconnected"
QT_MOC_LITERAL(6, 57, 12), // "bytesWritten"
QT_MOC_LITERAL(7, 70, 5), // "bytes"
QT_MOC_LITERAL(8, 76, 9) // "readyRead"
},
"Client\0sendData\0\0data\0clientConnected\0"
"clientDisconnected\0bytesWritten\0bytes\0"
"readyRead"
};
#undef QT_MOC_LITERAL
static const uint qt_meta_data_Client[] = {
// content:
7, // revision
0, // classname
0, 0, // classinfo
5, 14, // methods
0, 0, // properties
0, 0, // enums/sets
0, 0, // constructors
0, // flags
3, // signalCount
// signals: name, argc, parameters, tag, flags
1, 1, 39, 2, 0x06 /* Public */,
4, 0, 42, 2, 0x06 /* Public */,
5, 0, 43, 2, 0x06 /* Public */,
// slots: name, argc, parameters, tag, flags
6, 1, 44, 2, 0x0a /* Public */,
8, 0, 47, 2, 0x0a /* Public */,
// signals: parameters
QMetaType::Void, QMetaType::QByteArray, 3,
QMetaType::Void,
QMetaType::Void,
// slots: parameters
QMetaType::Void, QMetaType::LongLong, 7,
QMetaType::Void,
0 // eod
};
void Client::qt_static_metacall(QObject *_o, QMetaObject::Call _c, int _id, void **_a)
{
if (_c == QMetaObject::InvokeMetaMethod) {
Client *_t = static_cast<Client *>(_o);
Q_UNUSED(_t)
switch (_id) {
case 0: _t->sendData((*reinterpret_cast< QByteArray(*)>(_a[1]))); break;
case 1: _t->clientConnected(); break;
case 2: _t->clientDisconnected(); break;
case 3: _t->bytesWritten((*reinterpret_cast< qint64(*)>(_a[1]))); break;
case 4: _t->readyRead(); break;
default: ;
}
} else if (_c == QMetaObject::IndexOfMethod) {
int *result = reinterpret_cast<int *>(_a[0]);
void **func = reinterpret_cast<void **>(_a[1]);
{
typedef void (Client::*_t)(QByteArray );
if (*reinterpret_cast<_t *>(func) == static_cast<_t>(&Client::sendData)) {
*result = 0;
return;
}
}
{
typedef void (Client::*_t)();
if (*reinterpret_cast<_t *>(func) == static_cast<_t>(&Client::clientConnected)) {
*result = 1;
return;
}
}
{
typedef void (Client::*_t)();
if (*reinterpret_cast<_t *>(func) == static_cast<_t>(&Client::clientDisconnected)) {
*result = 2;
return;
}
}
}
}
const QMetaObject Client::staticMetaObject = {
{ &QObject::staticMetaObject, qt_meta_stringdata_Client.data,
qt_meta_data_Client, qt_static_metacall, nullptr, nullptr}
};
const QMetaObject *Client::metaObject() const
{
return QObject::d_ptr->metaObject ? QObject::d_ptr->dynamicMetaObject() : &staticMetaObject;
}
void *Client::qt_metacast(const char *_clname)
{
if (!_clname) return nullptr;
if (!strcmp(_clname, qt_meta_stringdata_Client.stringdata0))
return static_cast<void*>(const_cast< Client*>(this));
return QObject::qt_metacast(_clname);
}
int Client::qt_metacall(QMetaObject::Call _c, int _id, void **_a)
{
_id = QObject::qt_metacall(_c, _id, _a);
if (_id < 0)
return _id;
if (_c == QMetaObject::InvokeMetaMethod) {
if (_id < 5)
qt_static_metacall(this, _c, _id, _a);
_id -= 5;
} else if (_c == QMetaObject::RegisterMethodArgumentMetaType) {
if (_id < 5)
*reinterpret_cast<int*>(_a[0]) = -1;
_id -= 5;
}
return _id;
}
// SIGNAL 0
void Client::sendData(QByteArray _t1)
{
void *_a[] = { nullptr, const_cast<void*>(reinterpret_cast<const void*>(&_t1)) };
QMetaObject::activate(this, &staticMetaObject, 0, _a);
}
// SIGNAL 1
void Client::clientConnected()
{
QMetaObject::activate(this, &staticMetaObject, 1, nullptr);
}
// SIGNAL 2
void Client::clientDisconnected()
{
QMetaObject::activate(this, &staticMetaObject, 2, nullptr);
}
QT_WARNING_POP
QT_END_MOC_NAMESPACE