Eryk Sun added the comment:
A literal backlash has to be escaped by doubling it if it precedes a double
quote, else it escapes the double quote character. This is how typical
command-line argument parsing handles backslash in Windows [1]:
* 2n backslashes followed by a quotation mark produce n backslashes
followed by begin/end quote. This does not become part of the
parsed argument, but toggles the "in quotes" mode.
* (2n) + 1 backslashes followed by a quotation mark again produce n
backslashes followed by a quotation mark literal ("). This does
not toggle the "in quotes" mode.
* n backslashes not followed by a quotation mark simply produce n
backslashes.
For example:
import ctypes
shell32 = ctypes.WinDLL('shell32', use_last_error=True)
shell32.CommandLineToArgvW.restype = ctypes.POINTER(ctypes.c_wchar_p)
n = ctypes.c_int()
Escape the trailing backslash as a literal backslash:
>>> cmd = r'/quiet TargetDir="D:\pyt hon\\" AssociateFiles=0'
>>> args = shell32.CommandLineToArgvW(cmd, ctypes.byref(n))
>>> args[:n.value]
['/quiet', 'TargetDir=D:\\pyt hon\\', 'AssociateFiles=0']
Escape the double quote as a literal double quote:
>>> cmd = r'/quiet TargetDir="D:\pyt hon\" AssociateFiles=0'
>>> args = shell32.CommandLineToArgvW(cmd, ctypes.byref(n))
>>> args[:n.value]
['/quiet', 'TargetDir=D:\\pyt hon" AssociateFiles=0']
---
[1]
https://docs.microsoft.com/en-us/windows/win32/api/shellapi/nf-shellapi-commandlinetoargvw
--
components: +Windows
nosy: +eryksun, paul.moore, steve.dower, tim.golden, zach.ware
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