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QT中信号槽的断开

分类：Others, Qt 阅读 (4,292) No Responses »

2月 142019

对对象每次执行一次connect的操作，都会增加一个信号槽连接

如果我们想断开某个对象的所有信号槽，调用对象的disconnect()方法

如果想断开某一个信号槽，在connect时将返回的对象保存一下，然后调用QObject的disconnect()就可以了，如下面的代码：

dialog.cpp文件

#include "dialog.h"
#include "ui_dialog.h"

Dialog::Dialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Dialog)
{
    ui->setupUi(this);
}

Dialog::~Dialog()
{
    delete ui;
}

void Dialog::on_pushButton_2_clicked()
{
    Connection1 = connect(ui->btnTest, SIGNAL(clicked(bool)), this, SLOT(connectFunc1(bool)));
}

void Dialog::on_pushButton_3_clicked()
{
    connect(ui->btnTest, SIGNAL(clicked(bool)), this, SLOT(connectFunc2(bool)));
}

void Dialog::connectFunc1(bool b)
{
    qDebug() << "connectFunc1";
}

void Dialog::connectFunc2(bool b)
{
    qDebug() << "connectFunc2";
}

void Dialog::on_pushButton_clicked()
{
    // 断开所有的connect
    ui->btnTest->disconnect();
}

void Dialog::on_pushButton_4_clicked()
{
    // 只断开其中的某个connect
    disconnect(Connection1);
}

#include "dialog.h"

#include "ui_dialog.h"

Dialog::Dialog(QWidget *parent) :

QDialog(parent),

ui(new Ui::Dialog)

{

ui->setupUi(this);

}

Dialog::~Dialog()

{

delete ui;

}

void Dialog::on_pushButton_2_clicked()

{

Connection1 = connect(ui->btnTest, SIGNAL(clicked(bool)), this, SLOT(connectFunc1(bool)));

}

void Dialog::on_pushButton_3_clicked()

{

connect(ui->btnTest, SIGNAL(clicked(bool)), this, SLOT(connectFunc2(bool)));

}

void Dialog::connectFunc1(bool b)

{

qDebug() << "connectFunc1";

}

void Dialog::connectFunc2(bool b)

{

qDebug() << "connectFunc2";

}

void Dialog::on_pushButton_clicked()

{

// 断开所有的connect

ui->btnTest->disconnect();

}

void Dialog::on_pushButton_4_clicked()

{

// 只断开其中的某个connect

disconnect(Connection1);

}

dialog.h头文件

#ifndef DIALOG_H
#define DIALOG_H

#include <QDialog>
#include <QMetaObject>

#include <QDebug>

namespace Ui {
class Dialog;
}

class Dialog : public QDialog
{
    Q_OBJECT

public:
    explicit Dialog(QWidget *parent = 0);
    ~Dialog();

private slots:
    void on_pushButton_2_clicked();
    void on_pushButton_3_clicked();

    void connectFunc1(bool b);
    void connectFunc2(bool b);

    void on_pushButton_clicked();

    void on_pushButton_4_clicked();

private:
    Ui::Dialog *ui;
    QMetaObject::Connection Connection1;
};

#endif // DIALOG_H

#ifndef DIALOG_H

#define DIALOG_H

#include <QDialog>

#include <QMetaObject>

#include <QDebug>

namespace Ui {

class Dialog;

}

class Dialog : public QDialog

{

Q_OBJECT

public:

explicit Dialog(QWidget *parent = 0);

~Dialog();

private slots:

void on_pushButton_2_clicked();

void on_pushButton_3_clicked();

void connectFunc1(bool b);

void connectFunc2(bool b);

void on_pushButton_clicked();

void on_pushButton_4_clicked();

private:

Ui::Dialog *ui;

QMetaObject::Connection Connection1;

};

#endif // DIALOG_H

界面图片：

Qt中引用win32库的方法

分类：Others, Qt 阅读 (5,716) No Responses »

1月 282019

开发环境：QT+Vs2015

想使用SetCursorPos来控制鼠标的位置

#include <Winuser.h>

但是编译时，总时提示无法解析的外部符号

网上搜了一上，需要引用User32.lib库，最后发现需要在项目的.pro文件中加入user32的库的引用，如下：

FORMS += \
        mainwindow.ui

win32 {
    LIBS += -luser32
}

FORMS += \

mainwindow.ui

win32 {

LIBS += -luser32

}

如果编译还是不成功，把项目目录下生成的debug目录（build-xxxx-Desktop_Qt_5_10_1_MSVC2015_32bit-Debug）删除掉，再重新编译一下

修改QLabel使QLabel支持鼠标事件

分类：Others, Qt 阅读 (2,736) No Responses »

1月 272019

　　QLabel并不支持鼠标按下、松开等事件，我们需要新建一个QLabel的子类来支持。

　　编写qadvancedlabel.h

#ifndef QADVANCEDLABEL_H
#define QADVANCEDLABEL_H

#include <QLabel>

class QAdvancedLabel : public QLabel
{
    Q_OBJECT

public:
    QAdvancedLabel(QWidget *parent = nullptr);

protected:
    virtual void mousePressEvent(QMouseEvent *event);    //鼠标按下
    virtual void mouseReleaseEvent(QMouseEvent *event);  //鼠标松开
    virtual void mouseDoubleClickEvent(QMouseEvent *event);  //双击鼠标
    virtual void mouseMoveEvent(QMouseEvent *event);     //鼠标移动

signals:
    void pressed(QMouseEvent *event);  //鼠标按下
    void clicked(QMouseEvent *event);  //鼠标松开
    void doubled(QMouseEvent *event);  //双击鼠标
    void moved(QMouseEvent *event);    //鼠标移动

public slots:
};

#endif // QADVANCEDLABEL_H

#ifndef QADVANCEDLABEL_H

#define QADVANCEDLABEL_H

#include <QLabel>

class QAdvancedLabel : public QLabel

{

Q_OBJECT

public:

QAdvancedLabel(QWidget *parent = nullptr);

protected:

virtual void mousePressEvent(QMouseEvent *event); //鼠标按下

virtual void mouseReleaseEvent(QMouseEvent *event); //鼠标松开

virtual void mouseDoubleClickEvent(QMouseEvent *event); //双击鼠标

virtual void mouseMoveEvent(QMouseEvent *event); //鼠标移动

signals:

void pressed(QMouseEvent *event); //鼠标按下

void clicked(QMouseEvent *event); //鼠标松开

void doubled(QMouseEvent *event); //双击鼠标

void moved(QMouseEvent *event); //鼠标移动

public slots:

};

#endif // QADVANCEDLABEL_H

　　然后增加QAdvancedLabel的cpp文件，qadvancedlabel.cpp

#include "include/qadvancedlabel.h"

QAdvancedLabel::QAdvancedLabel(QWidget *parent) : QLabel(parent)
{
}


void QAdvancedLabel::mousePressEvent(QMouseEvent *event)
{
    emit pressed(event);
}

void QAdvancedLabel::mouseReleaseEvent(QMouseEvent *event)
{
    emit clicked(event);
}

void QAdvancedLabel::mouseDoubleClickEvent(QMouseEvent *event)
{
    emit doubled(event);
}

void QAdvancedLabel::mouseMoveEvent(QMouseEvent *event)
{
    emit moved(event);
}

#include "include/qadvancedlabel.h"

QAdvancedLabel::QAdvancedLabel(QWidget *parent) : QLabel(parent)

{

}

void QAdvancedLabel::mousePressEvent(QMouseEvent *event)

{

emit pressed(event);

}

void QAdvancedLabel::mouseReleaseEvent(QMouseEvent *event)

{

emit clicked(event);

}

void QAdvancedLabel::mouseDoubleClickEvent(QMouseEvent *event)

{

emit doubled(event);

}

void QAdvancedLabel::mouseMoveEvent(QMouseEvent *event)

{

emit moved(event);

}

　　然后在程序中的实现：

　　mainwindow.h文件

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QObject>
#include <QMainWindow>
#include <QMouseEvent>

#include "qadvancedlabel.h"

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT


public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

private slots:
    void onQAdvLabelMouseEvent(QMouseEvent *event);

private:
    Ui::MainWindow *ui;
    QAdvancedLabel *testQAdvLabel;

};

#endif // MAINWINDOW_H

#ifndef MAINWINDOW_H

#define MAINWINDOW_H

#include <QObject>

#include <QMainWindow>

#include <QMouseEvent>

#include "qadvancedlabel.h"

namespace Ui {

class MainWindow;

}

class MainWindow : public QMainWindow

{

Q_OBJECT

public:

explicit MainWindow(QWidget *parent = 0);

~MainWindow();

private slots:

void onQAdvLabelMouseEvent(QMouseEvent *event);

private:

Ui::MainWindow *ui;

QAdvancedLabel *testQAdvLabel;

};

#endif // MAINWINDOW_H

　　mainwindow.cpp文件

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    testQAdvLabel = new QAdvancedLabel(ui->centralWidget);
    testQAdvLabel->setText("test mouse move");
    connect(testQAdvLabel, SIGNAL(moved(QMouseEvent*)), this, SLOT(onQAdvLabelMouseEvent(QMouseEvent*)));

    testQAdvLabel->setMouseTracking(true);
}

void MainWindow::onQAdvLabelMouseEvent(QMouseEvent *event)
{
    qDebug("x: %d, y: %d", event->x(), event->y());
}

MainWindow::MainWindow(QWidget *parent) :

QMainWindow(parent),

ui(new Ui::MainWindow)

{

ui->setupUi(this);

testQAdvLabel = new QAdvancedLabel(ui->centralWidget);

testQAdvLabel->setText("test mouse move");

connect(testQAdvLabel, SIGNAL(moved(QMouseEvent*)), this, SLOT(onQAdvLabelMouseEvent(QMouseEvent*)));

testQAdvLabel->setMouseTracking(true);

}

void MainWindow::onQAdvLabelMouseEvent(QMouseEvent *event)

{

qDebug("x: %d, y: %d", event->x(), event->y());

}

　　记得一定要设置setMouseTracking，否则只有按下时才会响应move事件。

qt中发送http请求

分类：C++, Others, Qt 阅读 (5,154) No Responses »

8月 172018

　　在QT中发送http请求要使用下面的几个类

QNetworkAccessManager – 用于实际发送网络请求
QNetworkRequest – 用于构造http请求的内容
QNetworkReply – 用于构造http响应的内容

　　首先要在项目文件里增加network的支持，在xxx.pro里面加上如下代码

QT       += core gui
QT += network

1 2	QT += core gui QT += network

　　下面是具体的代码：

　　logindialog.h

#ifndef LOGINDIALOG_H
#define LOGINDIALOG_H

#include <QDialog>

#include <QNetworkAccessManager>
#include <QNetworkReply>
#include <QNetworkRequest>
#include <QUrl>

#include "constants.h"
#include "jsonobjs/jsonloginres.h"

namespace Ui {
class LoginDialog;
}

class LoginDialog : public QDialog
{
    Q_OBJECT

public:
    explicit LoginDialog(QWidget *parent = 0);
    ~LoginDialog();

private slots:
    void on_btnLogin_clicked();
    void onLoginReqFinished();

private:
    Ui::LoginDialog *ui;
    QNetworkAccessManager* mNam = NULL;
    QNetworkReply* mLoginReply = NULL;
    void reqLogin();

};

#endif // LOGINDIALOG_H

#ifndef LOGINDIALOG_H

#define LOGINDIALOG_H

#include <QDialog>

#include <QNetworkAccessManager>

#include <QNetworkReply>

#include <QNetworkRequest>

#include <QUrl>

#include "constants.h"

#include "jsonobjs/jsonloginres.h"

namespace Ui {

class LoginDialog;

}

class LoginDialog : public QDialog

{

Q_OBJECT

public:

explicit LoginDialog(QWidget *parent = 0);

~LoginDialog();

private slots:

void on_btnLogin_clicked();

void onLoginReqFinished();

private:

Ui::LoginDialog *ui;

QNetworkAccessManager* mNam = NULL;

QNetworkReply* mLoginReply = NULL;

void reqLogin();

};

#endif // LOGINDIALOG_H

　　logindialog.cpp

#include "logindialog.h"
#include "ui_logindialog.h"

LoginDialog::LoginDialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::LoginDialog)
{
    ui->setupUi(this);
    mNam = new QNetworkAccessManager(this);
    //连接返回的信号槽
    //connect(mNam, SIGNAL(finished(QNetworkReply*)), this, SLOT(onLoginReqFinished(QNetworkReply*)));
}

LoginDialog::~LoginDialog()
{
    delete mLoginReply;
    delete mNam;
    delete ui;
}

void LoginDialog::on_btnLogin_clicked()
{
    reqLogin();;
}

void LoginDialog::reqLogin()
{
    if(NULL != mLoginReply && !mLoginReply->isFinished()){
        return;
    }
    QNetworkRequest request;
    std::string url("http://bcoder.com/loginapi");

    QByteArray params ;
    params.append("ucode=" + ui->edtUserName->text());
    params.append("&password=" + ui->edtPassword->text());
    request.setUrl(QUrl(url.c_str()));
    //request.setRawHeader("Content-Type","application/json");
    request.setRawHeader("Content-Type","application/x-www-form-urlencoded");
//    request->setRawHeader("Accept","text/html, application/xhtml+xml, */*");
//    request->setRawHeader("Referer","http://localhost:8888/login");
//    request->setRawHeader("Accept-Language","zh-CN");
//    request->setRawHeader("X-Requested-With","XMLHttpRequest");
//    request->setRawHeader("User-Agent","Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)");
//    request->setRawHeader("Content-Type","application/x-www-form-urlencoded");
//    request->setRawHeader("Accept-Encoding","gzip,deflate");
//    request->setRawHeader("Host","localhost:8888");
//    request->setRawHeader("Content-Length","18");
//    request->setRawHeader("Connection","Keep-Alive");
//    request->setRawHeader("Cache-Control","no-cache");
    mLoginReply = mNam->post(request, params);
    connect(mLoginReply, SIGNAL(finished()), this, SLOT(onLoginReqFinished()));
}


void LoginDialog::onLoginReqFinished()
{
    QByteArray bytes = mLoginReply->readAll();  // bytes
    //QString string(bytes); // string
    QString string = QString::fromUtf8(bytes);
    JsonLoginRes res(string.toStdString());

    qDebug() << "---------------------------------\n" <<  string;

    mLoginReply->close();
//    mLoginReply->deleteLater();
}

#include "logindialog.h"

#include "ui_logindialog.h"

LoginDialog::LoginDialog(QWidget *parent) :

QDialog(parent),

ui(new Ui::LoginDialog)

{

ui->setupUi(this);

mNam = new QNetworkAccessManager(this);

//连接返回的信号槽

//connect(mNam, SIGNAL(finished(QNetworkReply*)), this, SLOT(onLoginReqFinished(QNetworkReply*)));

}

LoginDialog::~LoginDialog()

{

delete mLoginReply;

delete mNam;

delete ui;

}

void LoginDialog::on_btnLogin_clicked()

{

reqLogin();;

}

void LoginDialog::reqLogin()

{

if(NULL != mLoginReply && !mLoginReply->isFinished()){

return;

}

QNetworkRequest request;

std::string url("http://bcoder.com/loginapi");

QByteArray params ;

params.append("ucode=" + ui->edtUserName->text());

params.append("&password=" + ui->edtPassword->text());

request.setUrl(QUrl(url.c_str()));

//request.setRawHeader("Content-Type","application/json");

request.setRawHeader("Content-Type","application/x-www-form-urlencoded");

// request->setRawHeader("Accept","text/html, application/xhtml+xml, */*");

// request->setRawHeader("Referer","http://localhost:8888/login");

// request->setRawHeader("Accept-Language","zh-CN");

// request->setRawHeader("X-Requested-With","XMLHttpRequest");

// request->setRawHeader("User-Agent","Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)");

// request->setRawHeader("Content-Type","application/x-www-form-urlencoded");

// request->setRawHeader("Accept-Encoding","gzip,deflate");

// request->setRawHeader("Host","localhost:8888");

// request->setRawHeader("Content-Length","18");

// request->setRawHeader("Connection","Keep-Alive");

// request->setRawHeader("Cache-Control","no-cache");

mLoginReply = mNam->post(request, params);

connect(mLoginReply, SIGNAL(finished()), this, SLOT(onLoginReqFinished()));

}

void LoginDialog::onLoginReqFinished()

{

QByteArray bytes = mLoginReply->readAll(); // bytes

//QString string(bytes); // string

QString string = QString::fromUtf8(bytes);

JsonLoginRes res(string.toStdString());

qDebug() << "---------------------------------\n" << string;

mLoginReply->close();

// mLoginReply->deleteLater();

}

Qt生成uuid

分类：Others, Qt 阅读 (2,933) No Responses »

6月 252018

首选在mainwindow.h中加入头文件引用

#include <QUuid>
#include <QDebug>

1 2	#include <QUuid> #include <QDebug>

然后在mainwindow.cpp的构造函数中加入下面的代码：

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    QUuid uuid = QUuid::createUuid();
    QString uuidstr = uuid.toString();
    qDebug() << "RmcTOKEN: " << uuidstr;
}

MainWindow::MainWindow(QWidget *parent) :

QMainWindow(parent),

ui(new Ui::MainWindow)

{

ui->setupUi(this);

QUuid uuid = QUuid::createUuid();

QString uuidstr = uuid.toString();

qDebug() << "RmcTOKEN: " << uuidstr;

}

c++ “duplicate symbol for architecture x86_64″错误

分类：C++, Others, Qt 阅读 (2,907) No Responses »

1月 182018

　　C++出现: 1 duplicate symbol for architecture x86_64可能的问题如下：

你可能在一个头文件中定义了一个变量或者函数，但是这个头文件被多个cpp文件include了
你可能把一个静态变量(static)定义了多次
你可能在一个cpp文件中将一个函数定义了多次

　　可以查看详细的错误信息，看看是哪个变量或者函数被重复定义了。

　　本人这此遇到此问题是因为把一个静态变量的定义放在头文件里了，应该放到cpp文件里就没问题了。

#ifndef MANAGERCONFIG_H
#define MANAGERCONFIG_H

#include <iostream>

#include "iniparser/iniparser.h"

class ManagerConfig
{
public:
    ManagerConfig();
    ~ManagerConfig();

    static ManagerConfig* getInstance();
    static void deleteInstance();

private:
    static ManagerConfig* m_instance;

private:
    dictionary* ini;

private:
    std::string mUserId;
    std::string mUserName;
    std::string mLoginToken;

public:
    std::string getUserId();
    std::string getUserName();
    std::string getLogintoken();

public:
    void setUserId(std::string userid);
    void setUserName(std::string username);
    void setLogintoken(std::string logintoken);
};

//这里定义了静态变量，所以出问题了
//ManagerConfig* ManagerConfig::m_instance = NULL;

const std::string INIFILE_NAME = "managerconfig.ini";

#endif // MANAGERCONFIG_H

#ifndef MANAGERCONFIG_H

#define MANAGERCONFIG_H

#include <iostream>

#include "iniparser/iniparser.h"

class ManagerConfig

{

public:

ManagerConfig();

~ManagerConfig();

static ManagerConfig* getInstance();

static void deleteInstance();

private:

static ManagerConfig* m_instance;

private:

dictionary* ini;

private:

std::string mUserId;

std::string mUserName;

std::string mLoginToken;

public:

std::string getUserId();

std::string getUserName();

std::string getLogintoken();

public:

void setUserId(std::string userid);

void setUserName(std::string username);

void setLogintoken(std::string logintoken);

};

//这里定义了静态变量，所以出问题了

//ManagerConfig* ManagerConfig::m_instance = NULL;

const std::string INIFILE_NAME = "managerconfig.ini";

#endif // MANAGERCONFIG_H