lnk文件图标需要找到对应的exe文件所在真实路径才能获取图标，不能够直接获取。dll与没有指定图标的exe文件获取图标会报错。

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import win32gui
import win32ui
from PIL import Image
import win32com.client

def pra_lnk(file_path:str):
    """解析lnk文件"""
    shell = win32com.client.Dispatch("WScript.Shell")
    shortcut = shell.CreateShortCut(file_path)
    return shortcut.Targetpath

def get_ico_from_exe(file_path:str):
    """获取exe的ico图标"""
    # exePath = r"D:\code\test\纷享销客.exe"  # 替换
    file_path = pra_lnk(file_path) if ".lnk" in file_path else file_path
    try:
        large, small = win32gui.ExtractIconEx(f'{file_path}', 0)
        useIcon = large[0]
        destroyIcon = small[0]
        win32gui.DestroyIcon(destroyIcon)
        hdc = win32ui.CreateDCFromHandle(win32gui.GetDC(0))
        hbmp = win32ui.CreateBitmap()
        hbmp.CreateCompatibleBitmap(hdc, 32, 32)
        hdc = hdc.CreateCompatibleDC()
        hdc.SelectObject(hbmp)
        hdc.DrawIcon((0, 0), useIcon)
        bmpstr = hbmp.GetBitmapBits(True)
        img = Image.frombuffer(
            'RGBA',
            (32, 32),
            bmpstr, 'raw', 'BGRA', 0, 1
        )
        img.save('icon.png')
    except:
        print("获取图标失败！")

# C:\Users\Administrator\Desktop\Synology Chat.lnk
get_ico_from_exe(r"C:\Users\Administrator\Desktop\Synology Chat.lnk")