PYCAD如何读写Clipboard

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如题，如何使用PYCAD进行剪贴板操作，包括读取，写入，清空等操作

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from pycad.system import *
from pycad.runtime import *
import clr
clr.AddReference('System.Windows.Forms')
from System.Windows.Forms import Clipboard
@command()
def sv1(doc):
    with dbtrans(doc) as tr:
        clip=Clipboard.GetText()
        Clipboard.Clear()
        print(clip)
@command()
def sv2(doc):
    with dbtrans(doc) as tr:
        tmp_html="2312312312312we3"
        Clipboard.Clear()
        Clipboard.SetText(tmp_html)
        clip2=Clipboard

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