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[DllImport("xxxxxx.dll", CallingConvention = CallingConvention.Cdecl, EntryPoint = "CommPosProcess", CharSet = CharSet.Ansi)]
static extern int CommPosProcess(string pInput, [MarshalAs(UnmanagedType.LPStr)]StringBuilder pOutput);
var sb = new StringBuilder(256); //分配256字节的空间,可以自己调整这个大小
var ret = CommPosProcess(xxx, sb);