在PyQt中打印图像时出错

Question

我正在尝试在PyQt中打印一个小部件,但我得到的错误是"QPaintDevice:无法破坏正在绘制的绘图设备".我认为问题是我的方法结束了,因此在画家完成绘制像素图之前,qPaintDevice被销毁了.然而,我不知道如何减慢画家的速度.

我的方法的代码在这里:

def printer(self):
    "Prints the current diagram"
    # Create the printer
    printerobject = QtGui.QPrinter(0)
    # Set the settings
    printdialog = QtGui.QPrintDialog(printerobject)
    if printdialog.exec_() == QtGui.QDialog.Accepted:
        # Print
        pixmapImage = QtGui.QPixmap.grabWidget(self.contentswidget)
        painter = QtGui.QPainter(printerobject)
        painter.drawPixmap(0, 0, pixmapImage)

对于它的价值,我尝试使用.begin()和.end()方法,但无济于事.

Answer 1

我想出了我的问题 - 我忘了删除画家,事后看来这很明显(不是总是吗？).将"del painter"添加到最后使代码工作.这是工作代码:

def printer(self):
    "Prints the current diagram"
    # Create the printer
    printerobject = QtGui.QPrinter(0)
    # Set the settings
    printdialog = QtGui.QPrintDialog(printerobject)
    if printdialog.exec_() == QtGui.QDialog.Accepted:
        # Print
        pixmapImage = QtGui.QPixmap.grabWidget(self.contentswidget)
        painter = QtGui.QPainter(printerobject)
        painter.drawPixmap(0, 0, pixmapImage)
        del painter