TypeError：QPixmap.toImage（）：未绑定方法的第一个参数必须具有类型“ QPixmap”

Question

I have a method that compare labels contents and return matches . The method is :

def get_selected_image(self):
    if self.labelDisplayBigImage.pixmap() is None:
        return False
    first_image = QtGui.QPixmap.toImage(self.labelDisplayBigImage.pixmap())
    selectable_images = [self.labelDisplayImage1, self.labelDisplayImage2, self.labelDisplayImage3,
                         self.labelDisplayImage4, self.labelDisplayImage5, self.labelDisplayImage6,
                         self.labelDisplayImage7, self.labelDisplayImage8]

    for i in range(len(selectable_images)):
        second_image = QtGui.QPixmap.toImage(selectable_images[i].pixmap())
        if first_image == second_image:
            return selectable_images[i].pixmap()

But got an error TypeError: QPixmap.toImage(): first argument of unbound method must have type 'QPixmap' . So what is the problem ?

Answer 1

To use the "toImage" method you first have to instantiate the Qpixmap class to an object. See http://python.6.x6.nabble.com/QPixmap-loadFromData-td5003372.html

In the example "loadfromdata" is used instead of "toImage", but the principle is the same.

Answer 2

The xxx.pixmap() methods you are using already return constructed QPixmap s. Instead of trying to use the QPixmap.toImage(xxx.pixmap()) , just use xxx.pixmap().toImage() .

In your case that would be self.labelDisplayBigImage.pixmap().toImage() and selectable_images[i].pixmap().toImage() .