Memory error for Qlabel

[Qt Coder]

Hello All,


I m using Qt 4.4.0

I have below code

//in Header file 
class C1
{
private:
        QLabel *img_label_1;
	QLabel *img_label_2;
 
	QLabel *img_label_3;
	QLabel	*img_label_4;
}

//in Header file 
class C1
{
private:
        QLabel *img_label_1;
	QLabel *img_label_2;

	QLabel *img_label_3;
	QLabel	*img_label_4;
}

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//in CPP file
 
 
C1::C1(QWidget * parent):QDialog(parent)
{
        ui.setupUi(this);
	setWindowFlags( Qt::FramelessWindowHint);
 
	img_label_4 = NULL;
	img_label_1 = NULL;
	img_label_2 = NULL;
	img_label_3 = NULL;
 
 
if((img_label_1 = new QLabel(ui.frame)) != NULL)
		QMessageBox::information(this,"TRUE","");
	img_label_1->setPixmap(QPixmap(":/images/pink-1.png"));
	img_label_1->setGeometry(6,4,16,16);
	img_label_1->setScaledContents(TRUE);
	img_label_1->show();
 
	img_label_1->setStyleSheet(	"border-style:solid;\n"
								"border-color:rgb(86,86,86);\n"
								"border-width:1px;\n"
								);
             //In same way I m alloctiing 2 more labels
          //And now the turn of 4th label
 
if((img_label_4 = new QLabel(this)) != NULL)
		QMessageBox::information(this,"TRUE","");
 
 
}

//in CPP file


C1::C1(QWidget * parent):QDialog(parent)
{
        ui.setupUi(this);
	setWindowFlags( Qt::FramelessWindowHint);

	img_label_4 = NULL;
	img_label_1 = NULL;
	img_label_2 = NULL;
	img_label_3 = NULL;


if((img_label_1 = new QLabel(ui.frame)) != NULL)
		QMessageBox::information(this,"TRUE","");
	img_label_1->setPixmap(QPixmap(":/images/pink-1.png"));
	img_label_1->setGeometry(6,4,16,16);
	img_label_1->setScaledContents(TRUE);
	img_label_1->show();

	img_label_1->setStyleSheet(	"border-style:solid;\n"
								"border-color:rgb(86,86,86);\n"
								"border-width:1px;\n"
								);
             //In same way I m alloctiing 2 more labels
          //And now the turn of 4th label

if((img_label_4 = new QLabel(this)) != NULL)
		QMessageBox::information(this,"TRUE","");


}

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Now the problem is
when I include

if((img_label_4 = new QLabel(this)) != NULL)

if((img_label_4 = new QLabel(this)) != NULL)

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statement
after closing the EXE it gives Memory error

If I comment the above line it doesnt giv any error..

The drive where program resides has 1.2 G free memory.

As soon as it allocates memory for 4th label ,it gives memory error after closing EXE.

Please help