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108 lines
3.3 KiB
Python
108 lines
3.3 KiB
Python
'''
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https://docs.microsoft.com/en-us/windows/desktop/api/wingdi/nf-wingdi-bitblt
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https://www.bugs.python.org/issue33656
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'''
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from os import getpid
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from os.path import join
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from ctypes import windll, c_int, addressof
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from win32gui import GetDesktopWindow, GetWindowDC
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from win32api import GetSystemMetrics
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from win32ui import CreateDCFromHandle, CreateBitmap
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from win32con import (
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SM_CXVIRTUALSCREEN,
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SM_CYVIRTUALSCREEN,
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SM_XVIRTUALSCREEN,
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SM_YVIRTUALSCREEN,
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SRCCOPY
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)
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from plyer.facades import Screenshot
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from plyer.platforms.win.storagepath import WinStoragePath
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class WinScreenshot(Screenshot):
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def __init__(self, file_path=None):
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default_path = join(
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WinStoragePath().get_pictures_dir(), 'screenshot.bmp'
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)
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super().__init__(file_path or default_path)
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def _set_dpi_aware(self, value):
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try:
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windll.shcore.SetProcessDpiAwareness(value)
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except (AttributeError, OSError):
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print('Could not set DPI awareness.')
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def _dpi_aware(self):
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# make backup of DPI awareness value in case a user does not want
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# to use it, otherwise we'll cripple user's runtime
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try:
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process_handle = windll.kernel32.OpenProcess(
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0, # no permissions
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False, # bInheritHandle
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getpid()
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)
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aware = c_int()
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windll.shcore.GetProcessDpiAwareness(
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process_handle,
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addressof(aware)
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)
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finally:
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# always close the handle!
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windll.kernel32.CloseHandle(process_handle)
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return bool(aware)
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def _capture(self):
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# make sure the process is DPI aware, otherwise the image
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# is only a part of the full monitor content
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# (necessary only on Win 8.1+)
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old_awareness = self._dpi_aware()
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self._set_dpi_aware(True)
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# get width and height of current monitor
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width = GetSystemMetrics(SM_CXVIRTUALSCREEN)
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height = GetSystemMetrics(SM_CYVIRTUALSCREEN)
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# get 'desktop' window handle
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handle_desktop = GetDesktopWindow()
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# get window graphic context handle
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handle_context = GetWindowDC(handle_desktop)
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# create device context
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dev_ctx = CreateDCFromHandle(handle_context)
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# create destination for original device context
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dest_ctx = dev_ctx.CreateCompatibleDC()
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# create bitmap compatible with desktop window device
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bmp = CreateBitmap()
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bmp.CreateCompatibleBitmap(dev_ctx, width, height)
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# select bitmap into destination device
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dest_ctx.SelectObject(bmp)
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# populate selected bitmap in destination device
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dest_ctx.BitBlt(
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(0, 0), # start point (x, y)
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(width, height), # size of rectangle
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dev_ctx, # source device
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(
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GetSystemMetrics(SM_XVIRTUALSCREEN),
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GetSystemMetrics(SM_YVIRTUALSCREEN)
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), # source rectangle, can be different monitor
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SRCCOPY # copy directly without filters
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)
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# save bitmap to file
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bmp.SaveBitmapFile(dest_ctx, self.file_path)
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# return to the original state
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self._set_dpi_aware(old_awareness)
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def instance():
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return WinScreenshot()
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