qt的repaint的问题

在网上找了个qt刷屏的程序，

下面是主要代码，在main函数中调用showSlot程序，以便读取图形文件，但是遇到了奇怪的问题，

程序在linux PC端运行良好，用的是usr/lib/qt-3.1

但是在自己编译的qt embedded 就不行，显示每次都进入了paintEvent中，但是屏幕上就是没有显示，连窗口都没有，而且不论在主函数中调用了多少次显示图像，都只显示最后一张图。

请大家帮忙看看可能是怎么回事。

#include "form1.h"

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

/*

* Constructs a Form1 as a child of 'parent', with the

* name 'name' and widget flags set to 'f'.

*/

Form1::Form1( QWidget* parent, const char* name, WFlags fl )

: QWidget( parent, name, fl )

{

if ( !name )

setName( "Form1" );

pushButton2 = new QPushButton( this, "pushButton2" );

pushButton2->setGeometry( QRect( 230, 10, 91, 21 ) );

pushButton1 = new QPushButton( this, "pushButton1" );

pushButton1->setGeometry( QRect( 30, 10, 81, 21 ) );

languageChange();

resize( QSize(720, 480).expandedTo(minimumSizeHint()) );

clearWState( WState_Polished );

// signals and slots connections

connect( pushButton2, SIGNAL( released() ), this, SLOT( close() ) );

//   connect( pushButton1, SIGNAL( released() ), this, SLOT( showSlot() ) );

}

/*

* Destroys the object and frees any allocated resources

*/

Form1::~Form1()

{

// no need to delete child widgets, Qt does it all for us

}

/*

* Sets the strings of the subwidgets using the current

* language.

*/

void Form1::languageChange()

{

setCaption( tr( "Form1" ) );

pushButton2->setText( tr( "&Quit" ) );

pushButton1->setText( tr( "&Show" ) );

}

bool Form1::showSlot(const char * newfilename)

{

bool ok = false;

ok = image.load((QString)newfilename, 0);   //step 2

if (!ok)

{

printf("load image failed\n");

return false;

}

else printf("load %s success\n",newfilename);

ok = pm.convertFromImage(image, 0);   //step 3

if (!ok)

{

printf("convert from image to a pixmap failed\n");

return false;

}

repaint();

return FALSE;

}

void Form1::paintEvent(QPaintEvent *pe)

{

printf("enter paint function\n");

QPainter painter(this);

painter.setClipRect(pe->rect());

painter.drawPixmap(0, 0, pm);   //step 4

}