PYTHON-How to slovethe problem： pywintypes.error： (5， 'OpenClipboard'， 'Access is dedened')

Question

当我打开剪贴板时，我遇到了一个错误，上面写着"pywintypes.error:(5，"OpenClipboard"，"访问被拒绝"("。我在SO中看到了一些答案，但它们不能满足我的要求，因为我将一些DIB表单图片复制到剪贴板中，而不仅仅是许多答案提到的字符串之类的单词。代码如下，抄袭自martineau先生。martineau的伟大回答希望得到答案谢谢！

import ctypes
from ctypes.wintypes import *
import win32clipboard
from win32con import *
import sys,win32api,win32con
#GRAB
win32api.keybd_event(win32con.VK_SNAPSHOT, 0)
class BITMAPFILEHEADER(ctypes.Structure):
_pack_ = 1  # structure field byte alignment
_fields_ = [
('bfType', WORD),  # file type ("BM")
('bfSize', DWORD),  # file size in bytes
('bfReserved1', WORD),  # must be zero
('bfReserved2', WORD),  # must be zero
('bfOffBits', DWORD),  # byte offset to the pixel array
]
SIZEOF_BITMAPFILEHEADER = ctypes.sizeof(BITMAPFILEHEADER)
class BITMAPINFOHEADER(ctypes.Structure):
_pack_ = 1  # structure field byte alignment
_fields_ = [
('biSize', DWORD),
('biWidth', LONG),
('biHeight', LONG),
('biPLanes', WORD),
('biBitCount', WORD),
('biCompression', DWORD),
('biSizeImage', DWORD),
('biXPelsPerMeter', LONG),
('biYPelsPerMeter', LONG),
('biClrUsed', DWORD),
('biClrImportant', DWORD)
]
SIZEOF_BITMAPINFOHEADER = ctypes.sizeof(BITMAPINFOHEADER)
***#GAIN AN ERROR FROM THIS LINE***  
win32clipboard.OpenClipboard()
try:
if win32clipboard.IsClipboardFormatAvailable(win32clipboard.CF_DIB):
data = win32clipboard.GetClipboardData(win32clipboard.CF_DIB)
else:
print('clipboard does not contain an image in DIB format')
sys.exit(1)
finally:
win32clipboard.CloseClipboard()
bmih = BITMAPINFOHEADER()
ctypes.memmove(ctypes.pointer(bmih), data, SIZEOF_BITMAPINFOHEADER)
if bmih.biCompression != BI_BITFIELDS:  # RGBA?
print('insupported compression type {}'.format(bmih.biCompression))
sys.exit(1)
bmfh = BITMAPFILEHEADER()
ctypes.memset(ctypes.pointer(bmfh), 0, SIZEOF_BITMAPFILEHEADER)  # zero structure
bmfh.bfType = ord('B') | (ord('M') << 8)
bmfh.bfSize = SIZEOF_BITMAPFILEHEADER + len(data)  # file size
SIZEOF_COLORTABLE = 0
bmfh.bfOffBits = SIZEOF_BITMAPFILEHEADER + SIZEOF_BITMAPINFOHEADER + SIZEOF_COLORTABLE
bmp_filename = 'clipboard.bmp'
with open(bmp_filename, 'wb') as bmp_file:
bmp_file.write(bmfh)
bmp_file.write(data)
print('file "{}" created from clipboard image'.format(bmp_filename))

Answer 1

我想我找到了。看起来Windows做屏幕截图会锁定它。在键盘事件发送后添加一秒钟的睡眠可以让你的脚本在我的机器上工作。

编辑：如果你决定走"简单但邪恶"的路，这是最简单的重试代码。是的，我确实同意，这不是正确的方法，但这是一个快速而肮脏的解决方案。

def OpenClipboardWithEvilRetries(retries=10, delay=0.1):
while True:
try:
return win32clipboard.OpenClipboard()
except pywintypes.error as e:
if e.winerror!=5 or retries==0:
raise
retries = retries - 1
time.sleep(delay)