qt错误

wuhu

1. 
   
2. Makefile:139: warning: overriding commands for target `lcdrange.moc'
   
3. Makefile:136: warning: ignoring old commands for target `lcdrange.moc'
   
4. g++  -o 7 lcdrange.o main.o moc_lcdrange.o  -L/usr/lib/qt-3.1/lib -L/usr/X11R6/lib -lqt-mt -lXext -lX11 -lm
   
5. main.o(.text+0x0): In function `LCDRange::LCDRange[not-in-charge](QWidget*, char const*)':
   
6. /home/7/lcdrange.cpp:32: multiple definition of `LCDRange::LCDRange[not-in-charge](QWidget*, char const*)'
   
7. lcdrange.o(.text+0x0):/home/7/lcdrange.cpp:32: first defined here
   
8. main.o(.text+0xc0): In function `LCDRange::LCDRange[in-charge](QWidget*, char const*)':
   
9. /home/7/lcdrange.cpp:32: multiple definition of `LCDRange::LCDRange[in-charge](QWidget*, char const*)'
   
10. lcdrange.o(.text+0xc0):/home/7/lcdrange.cpp:32: first defined here
    
11. main.o(.text+0x180): In function `MyWidget::MyWidget[not-in-charge](QWidget*, char const*)':
    
12. /home/7/lcdrange.cpp:44: multiple definition of `MyWidget::MyWidget[not-in-charge](QWidget*, char const*)'
    
13. lcdrange.o(.text+0x180):/home/7/lcdrange.cpp:44: first defined here
    
14. main.o(.text+0x330): In function `MyWidget::MyWidget[in-charge](QWidget*, char const*)':
    
15. /home/7/lcdrange.cpp:44: multiple definition of `MyWidget::MyWidget[in-charge](QWidget*, char const*)'
    
16. lcdrange.o(.text+0x330):/home/7/lcdrange.cpp:44: first defined here
    
17. moc_lcdrange.o(.text+0x27d): In function `LCDRange::qt_invoke(int, QUObject*)':
    
18. /usr/lib/qt-3.1/include/private/qucom_p.h:388: undefined reference to `LCDRange::setValue(int)'
    
19. collect2: ld returned 1 exit status
    
20. make: *** [7] Error 1
    

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每次遇到这样的错误都很郁闷，不知道怎么下手解决！
请问有什么好方法吗？？？
谢谢！

wuhu

不是吧？没有人遇到过这样的问题？

cavendish

把你的源码贴出来吧
有什么不可以告人的么？

wuhu

lcdrange.cpp

1. 
   
2. #include <qpushbutton.h>
   
3. #include <qlcdnumber.h>
   
4. #include <qfont.h>
   
5. #include <qslider.h>
   
6. #include <qgrid.h>
   
7. #include "lcdrange.h"
   
8.    
   
9. LCDRange::LCDRange( QWidget *parent, const char *name)
   
10.         : QVBox( parent, name)
    
11. {
    
12.     QSlider *slider = new QSlider( Horizontal, this, "slider");
    
13.     slider->setRange( 0, 99);
    
14.     slider->setValue( 0);
    
15.    
    
16.     connect( slider, SIGNAL( valueChange(int) ),SIGNAL( valueChange( int) ) );
    
17. }
    
18. 
    
19. 
    
20. MyWidget::MyWidget( QWidget *parent, const char *name)
    
21.         : QVBox( parent, name)
    
22. {
    
23.     QPushButton *quit = new QPushButton( "Quit", this, "quit");
    
24.     quit->setFont( QFont( "Times", 18, QFont::Bold) );
    
25.    
    
26.    
    
27.     QGrid *grid = new QGrid( 4, this);
    
28.    
    
29.     LCDRange *previous = 0;
    
30.     for ( int r= 0; r< 4; r++)
    
31.     {
    
32.         for ( int c= 0; c< 4; c++)
    
33.         {
    
34.             LCDRange* lr = new LCDRange( grid);
    
35.             if ( previous)
    
36.       connect( lr,SIGNAL( valueChange( int)), previous, SLOT( setValue( int) ) );
    
37.         }
    
38.     }
    
39.             
    
40. }
    
41.    
    

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lcdrange.h

1. 
   
2. #ifndef LCDRANGE_H
   
3. #define LCDRANGG_H
   
4. 
   
5. #include <qvbox.h>
   
6. 
   
7. class QSlider;
   
8. 
   
9. class LCDRange: public QVBox
   
10. {
    
11.     Q_OBJECT
    
12.     public:
    
13.     LCDRange( QWidget *parent = 0, const char *name = 0);
    
14.     int value() const;
    
15.     public slots:
    
16.             void setValue( int);
    
17.    
    
18.     signals:
    
19.     void valueChanged( int);
    
20. };
    
21. 
    
22. class MyWidget: public QVBox
    
23. {
    
24.     public:
    
25.     MyWidget( QWidget *parent = 0, const char *name = 0);
    
26. };
    
27. 
    
28. #endif
    

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main.cpp

1. 
   
2. #include "lcdrange.h"
   
3. 
   
4. int main( int argc, char **argv)
   
5. {
   
6.     QApplication a( argc, argv);
   
7.    
   
8.     MyWidget w;
   
9.     a.setMainWidget( &w);
   
10.     w.show();
    
11.     return (a.exec() );
    
12. }
    
13. 
    
14.              
    
15. 
    

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说我QApplication a已经初始化了，但是不完全，不知道什么意思

wulfgang

lcdrange.cpp

#include <qpushbutton.h>
#include <qlcdnumber.h>
#include <qfont.h>
#include <qslider.h>
#include <qgrid.h>
#include "lcdrange.h"
   
LCDRange:CDRange( QWidget *parent, const char *name)
        : QVBox( parent, name)
{
    QSlider *slider = new QSlider( Horizontal, this, "slider");
    slider->setRange( 0, 99);
    slider->setValue( 0);
   
    connect( slider, SIGNAL( valueChanged(int) ),SIGNAL( valueChanged( int) ) );
}

void LCDRange::setValue( int )
{
   
}

MyWidget::MyWidget( QWidget *parent, const char *name)
        : QVBox( parent, name)
{
    QPushButton *quit = new QPushButton( "Quit", this, "quit");
    quit->setFont( QFont( "Times", 18, QFont::Bold) );
   
   
    QGrid *grid = new QGrid( 4, this);
   
    LCDRange *previous = 0;
    for ( int r= 0; r< 4; r++)
    {
        for ( int c= 0; c< 4; c++)
        {
            LCDRange* lr = new LCDRange( grid);
            if ( previous)
      connect( lr,SIGNAL( valueChanged( int)), previous, SLOT( setValue( int) ) );
        }
    }
       
}


lcdrange.h

#ifndef LCDRANGE_H
#define LCDRANGG_H

#include <qvbox.h>

class QSlider;

class LCDRange: public QVBox
{
    Q_OBJECT
    public:
    LCDRange( QWidget *parent = 0, const char *name = 0);
    int value() const;
    public slots:
            void setValue( int);
   
    signals:
    void valueChanged( int);
};

class MyWidget: public QVBox
{
    public:
    MyWidget( QWidget *parent = 0, const char *name = 0);
};

#endif

main.cpp

#include <qapplication.h>
#include "lcdrange.h"

int main( int argc, char **argv)
{
    QApplication a( argc, argv);
   
    MyWidget w;
    a.setMainWidget( &w);
    w.show();
    return (a.exec() );
}

wuhu

谢谢！错误是缺少一个construction