[SOLVED]The program has unexpectedly finished.

[tomasantunes]

My program crashes when I call this method. I'm trying to make graphic effect on an image.

void MainWindow::stripesOk()
{
    int nodeHeight = stripesDialog->nodeHeight;
    double division = imageObject->height() / nodeHeight;
    int totalNodes = qFloor(division);
    targetImage = new QImage(imageObject->size(), QImage::Format_ARGB32);

    painter = new QPainter(targetImage);

    for(int i = 0;i < totalNodes; i++)
    {
        int x = 0;
        int y = i * nodeHeight;
        int width = imageObject->width();
        int shift = stripesDialog->shift;
        int a = shift - (2 * shift);
        int b = shift;
        int randomShift = randomInterval(a,b);
        painter->drawImage(randomShift,y,*imageObject,x,y,width,nodeHeight);
    }

    imageObject = targetImage;
}

[mrjj]

@tomasantunes

Hi its hard to guess. You are 100% sure nodeHeight is not zero ?

Also if you start with debug, and place break point at first line, you can single step and see
which line that does the crash.

[tomasantunes]

thanks, the variables were not being set properly, so they were at 0 indeed.

the program is not crashing anymore, but I am only getting a blank image.

[yoavmil]

I think you may be using painter->drawImage wrong. try using the defualt values for all the params except the first 3. then see what happens.

[SGaist]

Hi,

Did you check the value of totalNodes ? Does the variables you use for drawImage have meaningful values ?

By the way, why allocate your QImage object on the heap ? That's not needed, furthermore, from the looks of it, you have a memory leak since you don't delete imageObject before replacing it with targetImage.

[tomasantunes]

solved, had to check another variable . thanks all