Python

Question

我目前正在尝试截取包含鼠标光标的屏幕截图 PIL.ImageGrab。

这是我的代码：

import ctypes, win32gui, win32ui
from PIL import Image, ImageGrab

size = round(ctypes.windll.shcore.GetScaleFactorForDevice(0) / 100 * 32)

cursor = get_cursor()

pixdata = cursor.load()
minsize = [size, None]

width, height = cursor.size
for y in range(height):
    for x in range(width):

        if pixdata[x, y] == (0, 0, 0, 255):
            pixdata[x, y] = (0, 0, 0, 0)

        else:
            if minsize[1] == None:
                minsize[1] = y

            if x < minsize[0]:
                minsize[0] = x

ratio = ctypes.windll.shcore.GetScaleFactorForDevice(0) / 100

img = ImageGrab.grab(bbox=None, include_layered_windows=True)

pos_win = win32gui.GetCursorPos()
pos = (round(pos_win[0]*ratio), round(pos_win[1]*ratio))


img.paste(cursor, pos, cursor)

img.save("screenshot.png")

这是我的 get_cursor() 功能：

def get_cursor():

    hcursor = win32gui.GetCursorInfo()[1]
    hdc = win32ui.CreateDCFromHandle(win32gui.GetDC(0))
    hbmp = win32ui.CreateBitmap()
    hbmp.CreateCompatibleBitmap(hdc, 36, 36)
    hdc = hdc.CreateCompatibleDC()
    hdc.SelectObject(hbmp)
    hdc.DrawIcon((0,0), hcursor)
    
    bmpinfo = hbmp.GetInfo()
    bmpbytes = hbmp.GetBitmapBits()
    bmpstr = hbmp.GetBitmapBits(True)
    cursor = Image.frombuffer('RGB', (bmpinfo['bmWidth'], bmpinfo['bmHeight']), bmpstr, 'raw', 'BGRX', 0, 1).convert("RGBA")
    
    win32gui.DestroyIcon(hcursor)    
    win32gui.DeleteObject(hbmp.GetHandle())
    hdc.DeleteDC()


    pixdata = cursor.load()
    minsize = [32, None]

    width, height = cursor.size
    for y in range(height):
        for x in range(width):

            if pixdata[x, y] == (0, 0, 0, 255):
                pixdata[x, y] = (0, 0, 0, 0)

            else:
                if minsize[1] == None:
                    minsize[1] = y

                if x < minsize[0]:
                    minsize[0] = x


    return cursor

问题是有些光标没有粘贴到正确的位置，因为它们的位置左侧有像素，如this（不注意质量）。

如何正确放置光标图像（或以其他方式解决问题）？

Answer 1

鼠标光标有一个“热点”，即图像相对于光标位置的位置这个“热点”可以这样获取：

import win32gui

hcursor = win32gui.GetCursorInfo()[1]
hotspot = win32gui.GetIconInfo(hcursor)[1:3]

所以完整的代码是：

import ctypes, win32gui, win32ui
from PIL import Image, ImageGrab


def get_cursor():
    hcursor = win32gui.GetCursorInfo()[1]
    hdc = win32ui.CreateDCFromHandle(win32gui.GetDC(0))
    hbmp = win32ui.CreateBitmap()
    hbmp.CreateCompatibleBitmap(hdc, 36, 36)
    hdc = hdc.CreateCompatibleDC()
    hdc.SelectObject(hbmp)
    hdc.DrawIcon((0,0), hcursor)
    
    bmpinfo = hbmp.GetInfo()
    bmpstr = hbmp.GetBitmapBits(True)
    cursor = Image.frombuffer('RGB', (bmpinfo['bmWidth'], bmpinfo['bmHeight']), bmpstr, 'raw', 'BGRX', 0, 1).convert("RGBA")
    
    win32gui.DestroyIcon(hcursor)    
    win32gui.DeleteObject(hbmp.GetHandle())
    hdc.DeleteDC()


    pixdata = cursor.load()


    width, height = cursor.size
    for y in range(height):
        for x in range(width):

            if pixdata[x, y] == (0, 0, 0, 255):
                pixdata[x, y] = (0, 0, 0, 0)


    hotspot = win32gui.GetIconInfo(hcursor)[1:3]

    return (cursor, hotspot)

cursor, (hotspotx, hotspoty) = get_cursor()
cursor.save("cursor.png")


ratio = ctypes.windll.shcore.GetScaleFactorForDevice(0) / 100

img = ImageGrab.grab(bbox=None, include_layered_windows=True)

pos_win = win32gui.GetCursorPos()
pos = (round(pos_win[0]*ratio - hotspotx), round(pos_win[1]*ratio - hotspoty))


img.paste(cursor, pos, cursor)

img.save("screenshot.png")

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