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About Qt Designe4.3.3, can not get the widget's pointer ...

happylife

Beginner

Posts: 7

1

Friday, March 14th 2008, 10:49am

About Qt Designe4.3.3, can not get the widget's pointer ...

I'm new to qt designer. I wrote a dialog with qt designer, but I found that when I tried to control the widget in the .ui I only got an empty pointer, can anyone give me some advise? Thanks.
here is the ui_scan.h generated by uic:

Source code

 
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********************************************************************************
** Form generated from reading ui file 'scan.ui'
**
** Created: Fri Mar 14 17:01:04 2008
**      by: Qt User Interface Compiler version 4.3.3
**
** WARNING! All changes made in this file will be lost when recompiling ui file!
********************************************************************************/

#ifndef UI_SCAN_H
#define UI_SCAN_H

#include <QtCore/QVariant>
#include <QtGui/QAction>
#include <QtGui/QApplication>
#include <QtGui/QButtonGroup>
#include <QtGui/QDialog>
#include <QtGui/QHBoxLayout>
#include <QtGui/QLabel>
#include <QtGui/QProgressBar>
#include <QtGui/QPushButton>
#include <QtGui/QSpacerItem>
#include <QtGui/QSpinBox>
#include <QtGui/QTextBrowser>
#include <QtGui/QVBoxLayout>
#include <QtGui/QWidget>

class Ui_ScanDlg
{
public:
    QWidget *layoutWidget;
    QVBoxLayout *vboxLayout;
    QLabel *label;
    QHBoxLayout *hboxLayout;
    QLabel *label_3;
    QSpinBox *SpinFrom;
    QLabel *label_4;
    QSpinBox *SpinTo;
    QSpacerItem *spacerItem;
    QPushButton *ButtonScan;
    QProgressBar *ProgressScan;
    QLabel *label_2;
    QTextBrowser *TextBroScanResult;

    void setupUi(QDialog *ScanDlg)
    {
    if (ScanDlg->objectName().isEmpty())
        ScanDlg->setObjectName(QString::fromUtf8("ScanDlg"));
    ScanDlg->resize(354, 453);
    layoutWidget = new QWidget(ScanDlg);
    layoutWidget->setObjectName(QString::fromUtf8("layoutWidget"));
    layoutWidget->setGeometry(QRect(20, 20, 311, 401));
    vboxLayout = new QVBoxLayout(layoutWidget);
    vboxLayout->setObjectName(QString::fromUtf8("vboxLayout"));
    vboxLayout->setContentsMargins(0, 0, 0, 0);
    label = new QLabel(layoutWidget);
    label->setObjectName(QString::fromUtf8("label"));

    vboxLayout->addWidget(label);

    hboxLayout = new QHBoxLayout();
    hboxLayout->setObjectName(QString::fromUtf8("hboxLayout"));
    label_3 = new QLabel(layoutWidget);
    label_3->setObjectName(QString::fromUtf8("label_3"));

    hboxLayout->addWidget(label_3);

    SpinFrom = new QSpinBox(layoutWidget);
    SpinFrom->setObjectName(QString::fromUtf8("SpinFrom"));
    SpinFrom->setValue(35);

    hboxLayout->addWidget(SpinFrom);

    label_4 = new QLabel(layoutWidget);
    label_4->setObjectName(QString::fromUtf8("label_4"));

    hboxLayout->addWidget(label_4);

    SpinTo = new QSpinBox(layoutWidget);
    SpinTo->setObjectName(QString::fromUtf8("SpinTo"));
    SpinTo->setValue(39);

    hboxLayout->addWidget(SpinTo);

    spacerItem = new QSpacerItem(40, 20, QSizePolicy::Expanding, QSizePolicy::Minimum);

    hboxLayout->addItem(spacerItem);

    ButtonScan = new QPushButton(layoutWidget);
    ButtonScan->setObjectName(QString::fromUtf8("ButtonScan"));

    hboxLayout->addWidget(ButtonScan);


    vboxLayout->addLayout(hboxLayout);

    ProgressScan = new QProgressBar(layoutWidget);
    ProgressScan->setObjectName(QString::fromUtf8("ProgressScan"));
    ProgressScan->setValue(0);

    vboxLayout->addWidget(ProgressScan);

    label_2 = new QLabel(layoutWidget);
    label_2->setObjectName(QString::fromUtf8("label_2"));

    vboxLayout->addWidget(label_2);

    TextBroScanResult = new QTextBrowser(layoutWidget);
    TextBroScanResult->setObjectName(QString::fromUtf8("TextBroScanResult"));

    vboxLayout->addWidget(TextBroScanResult);

    label_3->setBuddy(SpinFrom);
    label_4->setBuddy(SpinTo);
    label_2->setBuddy(TextBroScanResult);

    retranslateUi(ScanDlg);
    QObject::connect(ButtonScan, SIGNAL(clicked()), ProgressScan, SLOT(reset()));

    QMetaObject::connectSlotsByName(ScanDlg);
    } // setupUi

    void retranslateUi(QDialog *ScanDlg)
    {
    ScanDlg->setWindowTitle(QApplication::translate("ScanDlg", "Scan Channels", 0, QApplication::UnicodeUTF8));
    label->setText(QApplication::translate("ScanDlg", "Scan Range:", 0, QApplication::UnicodeUTF8));
    label_3->setText(QApplication::translate("ScanDlg", "From:", 0, QApplication::UnicodeUTF8));
    label_4->setText(QApplication::translate("ScanDlg", "To:", 0, QApplication::UnicodeUTF8));
    ButtonScan->setText(QApplication::translate("ScanDlg", "Scan", 0, QApplication::UnicodeUTF8));
    label_2->setText(QApplication::translate("ScanDlg", "Available Channels:", 0, QApplication::UnicodeUTF8));
    Q_UNUSED(ScanDlg);
    } // retranslateUi

};

namespace Ui {
    class ScanDlg: public Ui_ScanDlg {};
} // namespace Ui

#endif // UI_SCAN_H
/////////////////////////////////////////////////////////////////////////////#########################################3/

and here is the scan.h wrote by myself:

Source code

 
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#ifndef __SCAN_H__
#define __SCAN_H__

#include "ui_scan.h"
//class QTextBrowser;
//class QPushButton;
//class QSpinBox;
//class QProgressBar;
#include "mypsiscanner.h"
typedef struct tagCHAN_Info
{
    //int m_nChanNum;
    int ChanFreq;
    int SymbolRate;
    int QAM;
}CHAN_Info;///


//class ScanDlg : public QDialog, public Ui::ScanDlg
class ScanDlg : public QDialog, public Ui::ScanDlg
{
    Q_OBJECT
public :
    //ScanDlg( QWidget* parent = 0, Qt::WindowFlags f = 0  );   
    ScanDlg( QWidget* parent = 0 );   
    ~ScanDlg();
    int scanBetween(int startchan, int endchan);///
    int scanOneChannel(int freq, int byrate);

    int prepareScan();///<
signals:

private slots:
//    void updateRange();
    void on_SpinFrom_valueChanged(/*int value*/);//@#@#@if I use another function name here(do not use the setupUi to connect this SLOT to SpinFrom automatically), I also can only get empty pointers( can not control SpinFrom, SpinTo, ButtonScan and any other widgets designed in the Qt Designer)
    void on_SpinFrom_valueChanged(/*int value*/);
    void on_ButtonScan_clicked();
    void refreshScanResult();
private:
    CHAN_Info m_aChanIni[100];//chan 1 ~ chan 100   
    Ui::ScanDlg ui;
};

#endif
////////////////////////////////////////##################################33333

now the problem is that there are some make error like: scan.h:36:
error:'void ScanDlg::on_SpinFrom_valueChanged()' can not be overrided


if I use another SLOT function name here(do not use the setupUi to connect the on_SpinFrom_valueChanged() SLOT to SpinFrom automatically), it also doesn't work, I can not control SpinFrom, SpinTo, ButtonScan and any other widgets designed in the Qt Designer, these pointers are all NULL
Can anyone give me some advise? Thanks

This post has been edited 1 times, last edit by "happylife" (Mar 14th 2008, 10:53am)

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happylife

Beginner

Posts: 7

2

Friday, March 14th 2008, 11:16am

in the constructor ,the pointer "SpinFrom" and pointers to other widgets are all Null, so when the program try to run "connect ( SpinFrom, SIGNAL ( valueChanged(int) ), this, SLOT (on_SpinFrom_valueChanged(int) ) );" There will be a segmentation fault, and I don't know why...

Here is my Scan.cpp:

Source code

 
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#include "mypsiscanner.h"
#include "scan.h"
//#include "mypsiglobal.h"
#include <QtCore>
#include <QtGui>
#include <QListWidget>
#include <QLineEdit>
#include <QTextEdit>
#include <QPushButton>
#include <MyIniFile.h>
extern CBroadProgScanner g_broadProgScanner;
//extern int g_driverFD;>(mypsiscannerÌÔƒLb
¡…è„‹
//ScanDlg::ScanDlg(QWidget* parent, Qt::WindowFlags f)
//    : QDialog(parent,f)
ScanDlg::ScanDlg(QWidget* parent)
    : QDialog(parent)
{
    ui.setupUi(this);
    prepareScan();
    qDebug("pBut_scan is %p",ButtonScan);
    connect( ButtonScan, SIGNAL(clicked()),
             this, SLOT(onScanButtonClicked()) );
    connect( SpinFrom, SIGNAL(valueChanged(int)),
             this, SLOT(on_SpinFrom_valueChanged(int)));
    connect( SpinTo, SIGNAL(valueChanged(int)),
             this, SLOT(on_SpinTo_valueChanged(int)));
}
ScanDlg::~ScanDlg()
{

}
void ScanDlg::on_SpinFrom_valueChanged(int value)
{
     qDebug("ScanDlg: Spin1 Changed");
}
void ScanDlg::on_SpinTo_valueChanged(int value)
{
     qDebug("ScanDlg: Spin2 Changed");
}
//void ScanDlg::updateRange()
//{

//}
void ScanDlg::on_ButtonScan_clicked()
{

     qDebug("ScanDlg: ScanButton Clicked");
}
void ScanDlg::refreshScanResult()
{

}
int ScanDlg::scanBetween(int startchan, int endchan)
{

}
int ScanDlg::scanOneChannel(int freq, int byrate)
{

}
int ScanDlg::prepareScan()
{
....
....
    }
#include "moc_scan.cpp"
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janus

Beginner

Posts: 25

3

Saturday, March 29th 2008, 10:04am

hi,

if you use "void on_something_clicked()" you dont need to connect them manualy with "connect(....)". Maybe remove the "connect(...)" ?
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