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

[spirit]

why you don't create these labels in ui and then in ctor set all needed settings?

[Qt Coder]

same error is occuring when tried to add label from the designer.

[spirit]

could you attach you project?

[Qt Coder]

it's size is big & can't attach it here.

[talk2amulya]

dont attacht the whole project..just attach C1.cpp, C1.h and related ui file

[Qt Coder]

I have submiited all concerned code...


One thing is for sure that it gives error as soon as it allocates memory for anything after the 3rd label.


I hav tried creating

QGraphicsScene  *S = new QGraphicsScene(this)

QGraphicsScene  *S = new QGraphicsScene(this)

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and it gave error after closing..

If I debug the application for error it shows some disassembly code which is beyond understanding...


It allocates the memory for 4th label but while freeing that particular memory it is facing some problem .

Any help would be appreciated...

[faldzip]

And what is that this you are passing to the constructor?

P.S. And use CODE tags for code, and QUOTE tags for quotes.

[talk2amulya]

i still believe there is smth you havent shared with us that is causing the issue, cuz the above code looks pretty benign..could u attach the whole .h, .cpp and .ui files?

[Qt Coder]

Pls find attached files.

[talk2amulya]

when u r deleting the objects in delete_objects(), set them back to NULL too..read about dangling pointers http://en.wikipedia.org/wiki/Wild_pointer