将PIL / PILLOW图像复制到Windows剪贴板

时间:2014-01-23 21:16:29

标签: python winapi python-imaging-library ctypes pillow

我见过this question,我遵循每一步,更改代码以满足我的要求,即Python3,Pillow和ctypes。库越少越好。

import ctypes
from PIL import ImageGrab, Image
from io import BytesIO

user32 = ctypes.windll.user32

img = ImageGrab.grab()
output = BytesIO()
img.convert("RGB").save(output, "BMP")
data = output.getvalue()[14:]
output.close()

user32.OpenClipboard()
user32.EmptyClipboard()
user32.SetClipboardData(user32.CF_DIB, data)
user32.CloseClipboard()

这是我的脚本中的剥离代码,我认为,这是与我的要求移植的问题中的相同代码。执行时,应将当前桌面复制到剪贴板。我得到了这个:

File "C:\Users\Gcq\Documents\python\Screen\Screen.py", line 132, in shot
    user32.OpenClipboard()
ValueError: Procedure probably called with not enough arguments (4 bytes missing)

对不起,我在这里问这样一个(可能)简单的问题,但我真的不知道什么是失败的,而ctypes不是我的事。

2 个答案:

答案 0 :(得分:4)

呼。显然,与win32clipboard相比,ctypes库确实简化了一些事情。你试图简单地用一个替换另一个是远非正确的。

所以我启动了我的Windows虚拟机,安装了Pillow并重写了您的程序,从两个other answers学习:

import io

import ctypes
msvcrt = ctypes.cdll.msvcrt
kernel32 = ctypes.windll.kernel32
user32 = ctypes.windll.user32

from PIL import ImageGrab

img = ImageGrab.grab()
output = io.BytesIO()
img.convert('RGB').save(output, 'BMP')
data = output.getvalue()[14:]
output.close()

CF_DIB = 8
GMEM_MOVEABLE = 0x0002

global_mem = kernel32.GlobalAlloc(GMEM_MOVEABLE, len(data))
global_data = kernel32.GlobalLock(global_mem)
msvcrt.memcpy(ctypes.c_char_p(global_data), data, len(data))
kernel32.GlobalUnlock(global_mem)
user32.OpenClipboard(None)
user32.EmptyClipboard()
user32.SetClipboardData(CF_DIB, global_mem)
user32.CloseClipboard()

答案 1 :(得分:2)

该示例使用pywin32,它是围绕Win32 API的Python包装器,如果你想使用ctypes,它会隐藏你需要注意的一些低级细节。

以下是使用ctypes执行此操作的方法,它在功能上添加了创建全局分配的缓冲区并将data复制到该缓冲区中:

#!python

from PIL import Image
#from cStringIO import StringIO
from io import BytesIO
from ctypes import *
from ctypes.wintypes import *

HGLOBAL = HANDLE
SIZE_T = c_size_t
GHND = 0x0042
GMEM_SHARE = 0x2000

GlobalAlloc = windll.kernel32.GlobalAlloc
GlobalAlloc.restype = HGLOBAL
GlobalAlloc.argtypes = [UINT, SIZE_T]

GlobalLock = windll.kernel32.GlobalLock
GlobalLock.restype = LPVOID
GlobalLock.argtypes = [HGLOBAL]

GlobalUnlock = windll.kernel32.GlobalUnlock
GlobalUnlock.restype = BOOL
GlobalUnlock.argtypes = [HGLOBAL]

CF_DIB = 8

OpenClipboard = windll.user32.OpenClipboard
OpenClipboard.restype = BOOL 
OpenClipboard.argtypes = [HWND]

EmptyClipboard = windll.user32.EmptyClipboard
EmptyClipboard.restype = BOOL
EmptyClipboard.argtypes = None

SetClipboardData = windll.user32.SetClipboardData
SetClipboardData.restype = HANDLE
SetClipboardData.argtypes = [UINT, HANDLE]

CloseClipboard = windll.user32.CloseClipboard
CloseClipboard.restype = BOOL
CloseClipboard.argtypes = None

#################################################

image = Image.new("RGB", (200, 200), (255, 0, 0))

#output = StringIO()
output = BytesIO()
image.convert("RGB").save(output, "BMP")
data = output.getvalue()[14:]
output.close()

hData = GlobalAlloc(GHND | GMEM_SHARE, len(data))
pData = GlobalLock(hData)
memmove(pData, data, len(data))
GlobalUnlock(hData)

OpenClipboard(None)
EmptyClipboard()
SetClipboardData(CF_DIB, pData)
CloseClipboard()