想做一个窗体跳转程序，遇到问题了，请帮帮忙 [复制链接]

我想做一个QT3的窗体跳转程序，因为我个人接触qt不是很久，但是因为程序的需要。所以需要通过一个界面上面的一个按钮进入另一个界面。我尝试自己做了一个简单的测试程序，编译通过了，但是运行时出问题了。请帮帮忙啊，真的有急用，先谢谢了。以下是我的程序代码：

-----------firstform.h---------------

#ifndef FIRSTFORM_H
#define FIRSTFORM_H

#include <qvariant.h>
#include <qwidget.h>

#include "./secondform.h"

class QVBoxLayout;
class QHBoxLayout;
class QGridLayout;
class QSpacerItem;
class QPushButton;
class SecondForm;

class FirstForm : public QWidget
{
    Q_OBJECT

public:
    FirstForm( QWidget* parent = 0, const char* name = 0, WFlags fl = 0 );
    ~FirstForm();

    QPushButton* showButton;
    SecondForm second;

public slots:
    virtual void secShow();

protected:

protected slots:
    virtual void languageChange();

};

#endif // FIRSTFORM_H


----------------firstform.cpp---------------

#include "firstform.h"

#include <qvariant.h>
#include <qpushbutton.h>
#include <qlayout.h>
#include <qtooltip.h>
#include <qwhatsthis.h>
#include <qimage.h>
#include <qpixmap.h>

/*
*  Constructs a FirstForm as a child of 'parent', with the
*  name 'name' and widget flags set to 'f'.
*/
FirstForm::FirstForm( QWidget* parent, const char* name, WFlags fl )
    : QWidget( parent, name, fl )
{
    if ( !name )
    setName( "FirstForm" );

    showButton = new QPushButton( this, "showButton" );
    showButton->setGeometry( QRect( 40, 20, 104, 32 ) );
    languageChange();
    resize( QSize(177, 75).expandedTo(minimumSizeHint()) );
    clearWState( WState_Polished );

    // signals and slots connections
    connect( showButton, SIGNAL( clicked() ), this, SLOT( secShow() ) );
}

/*
*  Destroys the object and frees any allocated resources
*/
FirstForm::~FirstForm()
{
    // no need to delete child widgets, Qt does it all for us
}

/*
*  Sets the strings of the subwidgets using the current
*  language.
*/
void FirstForm::languageChange()
{
    setCaption( tr( "first" ) );
    showButton->setText( tr( "&Show" ) );
    showButton->setAccel( QKeySequence( tr( "Alt+S" ) ) );
}

void FirstForm::secShow()
{
    second.show();
}

}

----------------------secondform.h------------------
#ifndef SECONDFORM_H
#define SECONDFORM_H

#include <qvariant.h>
#include <qwidget.h>

class QVBoxLayout;
class QHBoxLayout;
class QGridLayout;
class QSpacerItem;

class SecondForm : public QWidget
{
    Q_OBJECT

public:
    SecondForm( QWidget* parent = 0, const char* name = 0, WFlags fl = 0 );
    ~SecondForm();


protected:

protected slots:
    virtual void languageChange();

};

#endif // SECONDFORM_H

---------------------secondform.cpp-----------------
#include "secondform.h"

#include <qvariant.h>
#include <qlayout.h>
#include <qtooltip.h>
#include <qwhatsthis.h>
#include <qimage.h>
#include <qpixmap.h>

/*
*  Constructs a SecondForm as a child of 'parent', with the
*  name 'name' and widget flags set to 'f'.
*/
SecondForm::SecondForm( QWidget* parent, const char* name, WFlags fl )
    : QWidget( parent, name, fl )
{
    if ( !name )
    setName( "SecondForm" );
    languageChange();
    resize( QSize(264, 151).expandedTo(minimumSizeHint()) );
    clearWState( WState_Polished );
}

/*
*  Destroys the object and frees any allocated resources
*/
SecondForm::~SecondForm()
{
    // no need to delete child widgets, Qt does it all for us
}

/*
*  Sets the strings of the subwidgets using the current
*  language.
*/
void SecondForm::languageChange()
{
    setCaption( tr( "second" ) );
}

------------------main.cpp--------------
#include <qapplication.h>
#include "firstform.h"

int main( int argc, char ** argv )
{
    QApplication a( argc, argv );
    FirstForm w;
    w.show();
    a.connect( &a, SIGNAL( lastWindowClosed() ), &a, SLOT( quit() ) );
    return a.exec();
}

程序执行时出现的错误提示为：   FirstForm::secShow(): Not implemented yet

还是我自己来回答吧，这个也是自己无可奈何的时候憋出来的。我将自己以前的一个编译正常的工程的Makefile文件拿来对比了下，发现其中有很多地方不同，当然我修改了下 其中的一些主要地方就可以了。