QImage Issue

[aamer4yu]

Will this thread be useful to you ??

[vishal.chauhan]

I m usng the following to create image from the uchar *......

bool QImage::loadFromData ( const uchar * data, int len, const char * format = 0 )

When i check this return vaue it is coming out to be true and when I m checking that....

if(image.isNull()) then it is returning false that is it is creating image but when i m setting that image in the pixmap using..

image=image.scaled(100,100); QPixmap pixmap;
pixmap.fromImage(image,Qt::AutoColor);

and showing that in the QListWidget it is not showing the image I m using the following code

listWidget->setViewMode(QListView::IconMode);
QListWidgetItem *LWidgetItem=new QListWidgetItem(pixmap,"HI",listWidget,0);

But it is showing the text HI not the image.

If any body knows why then plz help me again.

Thanks.

[wysota]

QPixmap::fromImage() is a static method returning the pixmap:

QImage img;
QPixmap pix = QPixmap::fromImage(img);

QImage img;
QPixmap pix = QPixmap::fromImage(img);

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[^NyAw^]

Hi,

Are you sure that you are not destructing the memory data buffer?
In the QImage contructor you can read this:

"The buffer must remain valid throughout the life of the QImage. The image does not delete the buffer at destruction."

So, I think that you have to mantain the data buffer into memory. Try to execute "bool bOK = image.isNull();" just after "loadFromData" call.

[vishal.chauhan]

Thanks to all of you.
Now I m able to do that.