Passing QImage to a function

ras123

Hi,
I need to write a function that accept QImage as an input. I declared QImage pointer as
@QImage *image;@
And create a new image and set this pointer as
@QImage img("path to image file");
image = &img;
@
And I have a function like this
@
somefunction(QImage *image)
{
ui->imgLabel->setPixmap(QPixmap::fromImage(*image)); // This line gives an arithmetic exception why?
}
@

It compiles without any error, but get an arithmetic exception at ui->imgLabel->setPixmap(QPixmap::fromImage(*image));

Also please let me know the difference between
@somefunction(QImage *image)@ and @somefunction(QImage &image)@

Thanking you,
Ras

SGaist

At first sight, your img goes out of scope, so it get destroyed.
You probably also have a warning saying that you are using a pointer to a local variable.

someFunction should use a const QImage& image (especially since you will set your QImage on a label)

QImage * is a pointer to a QImage
QImage & is a reference to a QImage

Have look at http://www.learncpp.com/cpp-tutorial/612-references-vs-pointers-and-member-selection/

Hope it helps