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  1. import win32gui
  2. import win32ui
  3. from ctypes import windll
  4. from contextlib import contextmanager
  5. from collections import namedtuple
  6.  
  7.  
  8. class NoSuchWindowError(Exception):
  9.     "ウィンドウが見つからなかった場合に投げる例外"
  10.  
  11.  
  12. class PrintScreenError(Exception):
  13.     "PrintScreenが失敗した場合に投げる例外"
  14.  
  15.  
  16. class WindowChapter():
  17.     def __init__(self):
  18.         self.hwnd_dc = None
  19.         self.mem_dc = None
  20.         self.src_dc = None
  21.         self.bmp = None
  22.  
  23.     def __del__(self):
  24.         if self.src_dc is not None:
  25.             self.src_dc.DeleteDC()
  26.             self.src_dc = None
  27.         if self.mem_dc is not None:
  28.             self.mem_dc.DeleteDC()
  29.             self.mem_dc = None
  30.         if self.bmp is not None:
  31.             win32gui.DeleteObject(self.bmp.GetHandle())
  32.             self.bmp = None
  33.         if self.hwnd_dc is not None:
  34.             win32gui.ReleaseDC(self.hwnd, self.hwnd_dc)
  35.             self.hwnd_dc = None
  36.  
  37.     @contextmanager
  38.     def capture_window(self, window_name):
  39.         self.hwnd = win32gui.FindWindow(None, window_name)
  40.         if self.hwnd == 0:
  41.             raise NoSuchWindowError
  42.  
  43.         # ウィンドウサイズを取得
  44.         left, top, right, bottom = win32gui.GetWindowRect(self.hwnd)
  45.         width = right - left
  46.         height = bottom - top
  47.  
  48.         # デバイスコンテキストを取得
  49.         self.hwnd_dc = win32gui.GetWindowDC(self.hwnd)
  50.         self.src_dc = win32ui.CreateDCFromHandle(self.hwnd_dc)
  51.         self.mem_dc = self.src_dc.CreateCompatibleDC()
  52.  
  53.         # ビットマップを作成
  54.         self.bmp = win32ui.CreateBitmap()
  55.         self.bmp.CreateCompatibleBitmap(self.src_dc, width, height)
  56.  
  57.         # ビットマップをデバイスコンテキストに関連付け
  58.         self.mem_dc.SelectObject(self.bmp)
  59.         result = windll.user32.PrintWindow(
  60.             self.hwnd, self.mem_dc.GetSafeHdc(), 0)
  61.         if result == 0:
  62.             raise PrintScreenError
  63.  
  64.         buf = self.bmp.GetBitmapBits(True)
  65.         Bitmap = namedtuple('Bitmap', ['data', 'width', 'height'])
  66.         yield Bitmap(buf, width, height)
  67.  
  68.  
  69. def main():
  70.     wc = WindowChapter()
  71.  
  72.     with wc.capture_window('NoxPlayer') as bmp:
  73.         # PILを使う場合
  74.         from PIL import Image
  75.         im = Image.frombuffer(
  76.             'RGB', (bmp.width, bmp.height), bmp.data, 'raw', 'BGRX', 0, 1)
  77.         im.save("test.png")
  78.  
  79.         # Numpyを使う場合(OpenCVはこっち)
  80.         import numpy as np
  81.         import matplotlib.pyplot as plt
  82.         data = np.frombuffer(bmp.data, dtype=np.uint8)
  83.         data = data.reshape(bmp.height, bmp.width, 4)
  84.         data = data[:, :, [2, 1, 0, 3]]  # BGR->RGB
  85.         plt.imshow(data)
  86.         plt.show()
  87.  
  88.  
  89. if __name__ == "__main__":
  90.     main()
  91.  
Runtime error #stdin #stdout #stderr 0.01s 7136KB
comments (?)
stdin 
Standard input is empty
stdout 
Standard output is empty
stderr 
Traceback (most recent call last):
  File "prog.py", line 1, in <module>
ImportError: No module named win32gui
https://ideone.com/2dPJQY
language:
Python (cpython 2.7.16)
created:
6 years ago
visibility:
public

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