PYTHON-如何解决问题 : pywintypes. 错误 : (5, 'OpenClipboard' , 'Access is denied' )

Question

打开剪贴板时出现错误，显示“pywintypes.error: (5, 'OpenClipboard', 'Access is denied')'。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 形式的图片复制到剪贴板中，但不仅仅是一些字符串——比如许多答案提到的单词。
代码如下，抄自Mr.martineau。 Mr.martineau's great answer
希望得到答复谢谢!

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 执行屏幕截图将其锁定。在键盘事件发送后添加一秒钟的 sleep 使您的脚本可以在我的机器上运行。

编辑:以防万一您决定采用“简单但邪恶”的方式，这是进行重试的最简单代码。是的，我同意，这不是正确的方法，但它是一个快速而肮脏的修复。

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)