自定义槽 No such slot

[fengyoujie]

诸位好。最近在做qt，自定义槽的时候，出现如下错误。先把代码贴出了，请各位老师，过目。

头文件：mainwindow.h

    #ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QtGui/QLineEdit>

namespace Ui {
    class MainWindow;
}

class MainWindow : public QMainWindow
{
     Q_OBJECT
public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

private:
    Ui::MainWindow *ui;
    QVector<QLineEdit*> lines;
    QStringList   paths;

public slots:
    void upload2Ftp();
    void inputFinish(QString,int);
  
};

#endif // MAINWINDOW_H

源文件：mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QDebug>
#include <QObject>
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow) {

    ui->setupUi(this);

    lines.append(ui->lineEdit_0);
    lines.append(ui->lineEdit_1);
    lines.append(ui->lineEdit_2);
    lines.append(ui->lineEdit_3);
    lines.append(ui->lineEdit_4);

    ui->progressBar->setRange(0,100);
    ui->progressBar->setValue(0);


    for(int i=0;i<lines.size();i++){
       QLineEdit* edit = lines.at(i);
       connect(edit,SIGNAL(editingFinished()),this->centralWidget(),SLOT(this->inputFinish(edit->text(),i)));
    }

      connect(ui->pushButton_0,SIGNAL(clicked()),this->centralWidget(),SLOT(this->upload2Ftp()));
}

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

void MainWindow::inputFinish(QString path,int index) {
    paths.replace(index,path);
}

void MainWindow::upload2Ftp(){
    for(int i=0;i<lines.size();i++){
        qDebug()<<paths.at(i);
    }
}

main.cpp文件

#include <QtGui/QApplication>
#include "mainwindow.h"
#include <QtGui/QPushButton>
#include <QtGui/QLineEdit>
int main(int argc, char *argv[]) {
    QApplication a(argc, argv);
    MainWindow w;
    w.show();
    return a.exec();
}

运行能出现界面，但是提示如下信息：
D:\ifnp\ftpGui\ftpGui-build-desktop\debug\ftpGui.exe 启动中...
Object::connect: No such slot QWidget::this->inputFinish(edit->text(),i) in ..\ftpGui\mainwindow.cpp:23
Object::connect: (sender name: 'lineEdit_0')
Object::connect: (receiver name: 'centralWidget')
Object::connect: No such slot QWidget::this->inputFinish(edit->text(),i) in ..\ftpGui\mainwindow.cpp:23
Object::connect: (sender name: 'lineEdit_1')
Object::connect: (receiver name: 'centralWidget')
Object::connect: No such slot QWidget::this->inputFinish(edit->text(),i) in ..\ftpGui\mainwindow.cpp:23
Object::connect: (sender name: 'lineEdit_2')
Object::connect: (receiver name: 'centralWidget')
Object::connect: No such slot QWidget::this->inputFinish(edit->text(),i) in ..\ftpGui\mainwindow.cpp:23
Object::connect: (sender name: 'lineEdit_3')
Object::connect: (receiver name: 'centralWidget')
Object::connect: No such slot QWidget::this->inputFinish(edit->text(),i) in ..\ftpGui\mainwindow.cpp:23
Object::connect: (sender name: 'lineEdit_4')


请诸位老师，错在哪里？

[我是学友]

必然出错！！！
你没有理解好this
connect(edit,SIGNAL(editingFinished()),this,SLOT(this->inputFinish(edit->text(),i)));

你的槽函数是定义在MainWindow 这个类中，所以接受者应该是this

而且我没有看错的话，你写的是centralWidget()，是个函数啊这个函数我在MainWindow 里面也没有找到，这么写有点莫名其妙，接受者不可以是函数

[看山不是山看水不是水]

老湿……直译过来就是 没有相关槽函数的定义， this->centralWidget()这个返回的是QMainWindow的中间Widget，没看到LZ setCentralWidget ( QWidget * widget )？LZ应该把各个信号的接受者连起来 而不是QMainWindow的CentralWidget；

   for(int i=0;i<lines.size();i++)
{
       QLineEdit* edit = lines.at(i);
       connect(edit,SIGNAL(editingFinished()), edit ,SLOT(this->inputFinish(edit->text(),i)));
    }

[fengyoujie]

[Quote=引用 1 楼 的回复:]
必然出错！！！
你没有理解好this
connect(edit,SIGNAL(editingFinished()),this,SLOT(this->inputFinish(edit->text(),i)));

你的槽函数是定义在MainWindow 这个类中，所以接受者应该是this

而且我没有看错的话，你写的是centralWidget()，是个函数啊这个函数我在MainWind……
[/Quote]



您的回答，让我更明白一步。
目前我把代码又改了一下：

for(int i=0;i<lines.size();i++){
QLineEdit* edit = lines.at(i);
connect(edit,SIGNAL(editingFinished()),this,SLOT(inputFinish(edit->text(),i)));
}

connect(ui->pushButton_0,SIGNAL(clicked()),this,SLOT(upload2Ftp()));

其余的不变。


错误还是有。
老师，我定义了两个槽
public slots:
void upload2Ftp();
void inputFinish(QString,int);

但是程序运行的时候，有一个槽没有找到。提示错误如下。老师给看看哪块出来问题？
Object::connect: No such signal QLineEdit::textChanged() in ..\ftpGui\mainwindow.cpp:23
Object::connect: (sender name: 'lineEdit_0')
Object::connect: (receiver name: 'MainWindow')
Object::connect: No such signal QLineEdit::textChanged() in ..\ftpGui\mainwindow.cpp:23
Object::connect: (sender name: 'lineEdit_1')
Object::connect: (receiver name: 'MainWindow')
Object::connect: No such signal QLineEdit::textChanged() in ..\ftpGui\mainwindow.cpp:23
Object::connect: (sender name: 'lineEdit_2')
Object::connect: (receiver name: 'MainWindow')
Object::connect: No such signal QLineEdit::textChanged() in ..\ftpGui\mainwindow.cpp:23
Object::connect: (sender name: 'lineEdit_3')
Object::connect: (receiver name: 'MainWindow')
Object::connect: No such signal QLineEdit::textChanged() in ..\ftpGui\mainwindow.cpp:23
Object::connect: (sender name: 'lineEdit_4')
Object::connect: (receiver name: 'MainWindow')

请问又是哪块出来问题？多谢了

[jdwx]

void QLineEdit::textChanged ( const QString & text ) [signal]
问题在于，你写的信号，QLineEdit里没有，只有上面的那个，区别是有一个参数。

[jdwx]

信号和槽使用起来很简单，信号和槽参数必须对应，信号的参数可以比槽多，多余的参数会被自动舍弃。
参数只写类型（如：int，QString），不要写参数名。

[fengyoujie]

谢谢诸位，问题解决了。结贴给分。

[Yeah_Csdn]

我也遇到同样的问题了，请问你是怎么解决的？

[qianqian0007]

bject::connect: No such slot QLabel::slotopen() in .\layoutdlg.cpp:27

[魔芋胡萝卜]

学习了...果然是this的问题