从 Python 调用 Qt 的 SWIG 接口

Question

我尝试从 Python 调用 C++ 函数，但我得到：

TypeError: in method 'drawColorWheel_NoPerf', argument 2 of type 'QPainter *'

我用的是swig2.0。

Python脚本： 小示例.py

#!/usr/bin/env python

import sys
from PyQt4 import QtCore, QtGui
import Qt4SWIGSimple

class MB_Window (QtGui.QWidget):
    def __init__ (self, parent = None):
        super (self.__class__, self).__init__ (parent)

    def paintEvent (self, event):
        painter = QtGui.QPainter (self)

        LabelPos = QtCore.QPointF (100, 100)
        painter.drawText (LabelPos, "%s" % ("Hello, world!"))

        Radius = 2
        Qt4SWIGSimple.drawColorWheel_NoPerf (Radius, painter)
        # Traceback (most recent call last):
        #  File "./SmallExample.py", line 19, in paintEvent
        #  DrawColorWheel_NoPerf.drawColorWheel_NoPerf (Radius, painter)
        # TypeError: in method 'drawColorWheel_NoPerf', argument 2 of type 'QPainter *'

def main (theArgs):
    App = QtGui.QApplication (theArgs)
    theMainWindow = MB_Window ()
    theMainWindow.show ()

    App.exec_ ()

if __name__ == "__main__":
    main (sys.argv)

到目前为止我的界面：

Qt4SWIGSimple.i：

%include "typemaps.i"

%module Qt4SWIGSimple

%{
/*
void drawColorWheel_NoPerf (int radius, QPainter *painter);
*/
#include "Qt4SWIGSimple.h"
%}

/* Let's just grab the original header file here */
%include "Qt4SWIGSimple.h"

Qt4SWIGSimple.h：

//#ifndef MAINWINDOW_H
#include <QPainter>
//#endif // MAINWINDOW_H

#ifdef __cplusplus
extern "C" {
#endif

void drawColorWheel_NoPerf (int radius, QPainter *painter);

#ifdef __cplusplus
}
#endif

非常感谢您的帮助！

Answer 1

感谢https://stackoverflow.com/users/2001654/musicamante

还有一个问题

将 pyqt 对象传递给 swig 导出的 C++ 代码

我找到了一个有效的解决方案。但我不太满意，因为我认为它应该更容易。

我将 python 脚本更改为：

...
    import sip 
    PainterAddress = sip.unwrapinstance (painter)
    DrawColorWheel_NoPerf.drawColorWheel_NoPerf_Sip (Radius, PainterAddress)
...

标题

Qt4SWIGSimple.h：至：

...
void drawColorWheel_NoPerf (int radius, QPainter *painter);
void drawColorWheel_NoPerf_Sip (int radius, long _painter_address);
...

并添加到c++文件中：

...
void drawColorWheel_NoPerf_Sip (int radius, long _painter_address) {
    drawColorWheel_NoPerf (radius, reinterpret_cast<QPainter*> (_painter_address));
}
...