PyQT5 fonts and HWND sample

pyTest.py

import sys
import ctypes
from PyQt5.QtWidgets import QApplication, QWidget
from PyQt5.QtGui import QFontDatabase, QFont, QFontMetrics, QImage, QPainter, QPen
from PyQt5.QtCore import Qt, QRectF

if __name__ == '__main__':
    
    app = QApplication(sys.argv)

    w = QWidget()
    w.resize(250, 150)
    w.move(300, 300)
    w.setWindowTitle('Simple')
    print(int(w.winId()))

    testDll = ctypes.CDLL('./testDll.dll')
    Test_Add_int = testDll.Test_Add_int
    Test_Add_int.argtypes = [ctypes.c_int, ctypes.c_int]
    Test_Add_int.restype = ctypes.c_int
    ret = Test_Add_int(2, 3)

    Test_Add_float = testDll.Test_Add_float
    Test_Add_float.argtypes = [ctypes.c_float, ctypes.c_float]
    Test_Add_float.restype = ctypes.c_float
    ret = Test_Add_float(2.1, 3.3)

    HWND_Func = testDll.HWND_Func
    HWND_Func.argtypes = [ctypes.c_uint32]
    HWND_Func(int(w.winId()))

    fonts = QFontDatabase().families()
    #for f in fonts:
    #    print(f)

    msg = "abcdefghijklmnopqrstuvwxyz"
    font = QFont("Tahoma")
    font.setUnderline(False)
    font.setPointSize(20)
    image = QImage(500, 100, QImage.Format_ARGB32_Premultiplied)
    painter = QPainter(image)
    painter.setFont(font)
    painter.fillRect(image.rect(), Qt.white)
    x = image.rect().x()
    y = image.rect().y()
    painter.drawText(image.rect(), Qt.AlignLeft | Qt.AlignTop, msg)
    metric = QFontMetrics(font)
    pen = QPen(Qt.red)
    painter.setPen(pen)
    for c in msg:
        r = QRectF(x, y, metric.width(c), metric.height())
        painter.drawRect(r)
        x += metric.width(c)
    image.save("output.png")

    w.show()
    
    sys.exit(app.exec_())