做了一个简单的ARM下Qtopia的控制LED例子,编译通过但不好使,求教! [复制链接]

我做了有两个控制按健PushButton的小应用程序,但在Arm开发板上一点击按钮就自动退出,不知道是怎么回事,
(驱动以测试过好用),请教原因:程序如下:
////////test.h/////////// /////
////// defined classsses////
#ifndef FORM1_H
#define FORM1_H

#include <qvariant.h>
#include <qdialog.h>
class QVBoxLayout;
class QHBoxLayout;
class QGridLayout;
class QPushButton;

class Form1 : public QDialog
{
  Q_OBJECT

public:
  Form1( QWidget* parent = 0, const char* name = 0, bool modal = FALSE, WFlags fl = 0 );
  ~Form1();

  QPushButton* PushButton1_1;   //点击后LED亮
  QPushButton* PushButton1_2;   //点击后LED灭
  QPushButton* PushButton1_3;   //退出健

public slots:
  virtual void On_slot();     //LED_on SLOT
  virtual void Off_slot();     //LED_OFF SLOT
private:
   char led;         //LED status
   int fd;          

};

#endif // FORM1_H

///////////test.cpp/////////////////////
#include "test.h"

#include <qpushbutton.h>
#include <qlayout.h>
#include <qvariant.h>
#include <qtooltip.h>
#include <qwhatsthis.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>


/*
* Constructs a Form1 which is a child of 'parent', with the
* name 'name' and widget flags set to 'f'
*
* The dialog will by default be modeless, unless you set 'modal' to
* TRUE to construct a modal dialog.
*/
Form1::Form1( QWidget* parent, const char* name, bool modal, WFlags fl )
  : QDialog( parent, name, modal, fl )
{
  if ( !name )
   setName( "Form1" );
  resize( 450, 325 );
  setCaption( tr( "Led" ) );

   int led0=0;
   int fd1;
   static char *dev_name1="/dev/keypad1";
   fd1=open(dev_name1,O_RDWR);
   write(fd1,(const char*)&led0,sizeof((const char)led0));
   close(fd1);

  PushButton1_1 = new QPushButton( this, "PushButton1_1" );
  PushButton1_1->setGeometry( QRect( 80, 100, 120, 35 ) );
  PushButton1_1->setText( tr( "Turn on" ) );

  PushButton1_2 = new QPushButton( this, "PushButton1_2" );
  PushButton1_2->setGeometry( QRect( 250, 100, 120, 35 ) );
  PushButton1_2->setText( tr( "Turn off" ) );

  PushButton1_3 = new QPushButton( this, "PushButton1_3" );
  PushButton1_3->setGeometry( QRect( 170, 190, 120, 35 ) );
  PushButton1_3->setText( tr( "Exit" ) );

  // signals and slots connections
  connect( PushButton1_1, SIGNAL( clicked() ), this, SLOT( On_slot() ) );
  connect( PushButton1_2, SIGNAL( clicked() ), this, SLOT( Off_slot() ) );
}

/*
* Destroys the object and frees any allocated resources
*/
Form1::~Form1()
{
  // no need to delete child widgets, Qt does it all for us
}

void Form1::On_slot()   /// operation to trun on the led
{
//   qWarning( "Form1::On_slot(): Not implemented yet!" );
   led=1;
   static char *dev_name="/dev/keypad1";
   fd=open(dev_name,O_RDWR);
   write(fd,(const char*)&led,sizeof((const char)led));
   close(fd);
}

void Form1::Off_slot()   /// operation to trun off the led
{
//   qWarning( "Form1::Off_slot(): Not implemented yet!" );
   led=0;
   static char *dev_name="/dev/keypad1";
   fd=open(dev_name,O_RDWR);
   write(fd,(const char*)&led,sizeof((const char)led));
   close(fd);
}
///////////main.cpp//////////////////////
#include "test.h"
#include <qapplication.h>
#include <qpushbutton.h>
#include <qfont.h>
int main(int argc,char **argv)
{

   QApplication a(argc,argv);
   Form1 w;
   a.setMainWidget(&w);
   w.show();
   return a.exec();
}