NewQPainter_1 crash

[xiayesuifeng]

type HelloWidget struct {
	*qtwidgets.QWidget

	helloStr []string
	x        []int
}
...

func (helloWidget *HelloWidget) paintEvent(event *qtgui.QPaintEvent) {
	painter := qtgui.NewQPainter_1(helloWidget)
	defer qtgui.DeleteQPainter(painter)
	painter.SetRenderHint(qtgui.QPainter__Antialiasing, true)

	for i := 0; i < len(helloWidget.helloStr); i++ {
		painter.DrawText_2(helloWidget.x[i], i*30+20, helloWidget.helloStr[i])
	}
}

[kitech]

这个比较底层，没测试到。目前还是以现有的widget为主的。

[xiayesuifeng]

然而只用现有的widget是不可能好好写gui的，而且这个qpainter。。。还是很重要，如果连qpainter都不能用，基本就没法用了。。。也不想用qml,蛋疼

[kitech]

发现问题原因，目前有一个可用的补救方法，只是真正修正还需要在考虑一下。

pointerStep := func(p unsafe.Pointer, offset uintptr) unsafe.Pointer {
	return unsafe.Pointer(uintptr(p) + offset)
}
// this offset can used for both Qt4 and Qt5, but only can used for get QPaintDevice pointer from QWidget.
NewQPainter := func(w qtwidgets.QWidget_ITF) *qtgui.QPainter {
	ptr := pointerStep(w.QWidget_PTR().GetCthis(), 2*unsafe.Sizeof(uintptr(0)))
	ptdev := qtgui.NewQPaintDeviceFromPointer(ptr)
	return qtgui.NewQPainter_1(ptdev)
}

[xiayesuifeng]

emmmm,我已经换回那个qt库了，等自定义信号槽搞定了再用回去，不然没法做通讯