新手弄毕业设计问题相当难搞定！！

小弟毕业设计要用qt做一个led控制的图形界面出现了比较大问题希望高手帮忙解决下呢初学者基础很差

下面是代码
edtest.h


#ifndef LEDTEST_H

#define LEDTEST_H

#include <QMainWindow>

namespace Ui {

  class ledtest;

}

class ledtest : public QMainWindow {

  Q_OBJECT

public:

  ledtest(QWidget *parent = 0);

  ~ledtest();

public slots:

  void LED1_Toggle();

  void LED2_Toggle();

void LED3_Toggle();

  void LED4_Toggle();

protected:

  void changeEvent(QEvent *e);

private:

  Ui::ledtest *ui;

};

#endif // LEDTEST_H

ledtest.c #include "ledtest.h"
#include "ui_ledtest.h"

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include<string.h>
#include <sys/ioctl.h>
#include<stdio.h>

#include<QDirectPainter>

static int fb;
static int LED1=0, LED2=0,LED3=0,LED4=0;

ledtest::ledtest(QWidget *parent) :
  QMainWindow(parent),
  ui(new Ui::ledtest)
{
  ui->setupUi(this);
  int screenWidth=QDirectPainter::screenWidth();
  int screenHeight=QDirectPainter::screenHeight();
  this->resize(screenWidth,screenHeight);
  connect(ui->checkBox_LED1,SIGNAL(toggled(bool)),this,SLOT(LED1_Toggle()));
  connect(ui->checkBox_LED2,SIGNAL(toggled(bool)),this,SLOT(LED2_Toggle()));
  connect(ui->checkBox_LED3,SIGNAL(toggled(bool)),this,SLOT(LED3_Toggle()));
  connect(ui->checkBox_LED4,SIGNAL(toggled(bool)),this,SLOT(LED4_Toggle()));

  system("/etc/rc.d/init.d/leds stop");
  fb=open("/dev/EmbedSky-leds",O_RDWR);
  if(fb<0)
  {
  perror("open device leds fail");
  exit(1);
  }
  for (int i = 0 ; i < 4; i ++)
  {
  ioctl(fb, 0, i);
  }

}

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

void ledtest::changeEvent(QEvent *e)
{
  QMainWindow::changeEvent(e);
  switch (e->type()) {
  case QEvent:: LanguageChange:
  ui->retranslateUi(this);
  break;
  default:
  break;
  }
}

void ledtest:: LED1_Toggle()
{
  LED1=~LED1;
  if(LED1==1)
  {
  ioctl(fb,1,0);
  }
  else
  {
  ioctl(fb,0,0);
  }
}
void ledtest:: LED2_Toggle()
{
  LED2=~LED2;
  if(LED2==1)
  {
  ioctl(fb,1,1);
  }
  else
  {
  ioctl(fb,0,1);
  }
}
void ledtest:: LED3_Toggle()
{
  LED3=~LED3;
  if(LED3==1)
  {
  ioctl(fb,1,2);
  }
  else
  {
  ioctl(fb,0,2);
  }
}
void ledtest:: LED4_Toggle()
{
  LED4=~LED4;
  if(LED4==1)
  {
  ioctl(fb,1,3);
  }
  else
  {
  ioctl(fb,0,3);
  }
}
--------------------编程问答-------------------- 木有图片！ --------------------编程问答-------------------- /upload/20131225/1ddc58c88d1001e93357b1b4b80e7bec55e797c7.gif

这是图片地址不好意思啦刚申请的号一周内不能上传图片呢 --------------------编程问答--------------------

补充：移动开发 ,  Qt

新手 弄毕业设计 问题相当难搞定！！

新手弄毕业设计问题相当难搞定！！