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Editorial Team
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Asked: 2026-05-16T22:42:50+00:00

I have to open a file using ZwOpenFile API. This is my requirement. When

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I have to open a file using ZwOpenFile API. This is my requirement. When I set the path in object name parameter. I could see fields Length and maximumlength in the object name.

Length is just length of the path and I usually keep maximumlength as the value of Length.

It worked mostly, however some times it doesnot work. In some cases I solved it via maximumlength = length *2. Even this computation doesn’t work for few other cases.

I am very much puzzled with the Maximumlength value computation.

Can some one help.

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1 Answer

  1. Editorial Team

    Look at UNICODE_STRING structure definition: link

    Length is wcslen(str.Buffer) * sizeof(WCHAR) == * 2

    MaximumLength field may be Length + sizeof(WCHAR) == Length + 2

    ZwOpenFile will not write to this string, so we shouldn’t care about capacity of string.

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