CODEWITHSUNDEEP
c++cwinapi
Rustam Shakirov
Rustam Shakirov

Reputation: 125

How to lock file in Windows?

How to lock file in Windows so that this file can be opened/read/wrote only by one process?

I found out that file can be locked with CreateFile by giving 0 to dwShareMode flag. It works but only the returned handle can be used to work with file. But I want to be able to lock the file to other processes and at the same time to create multiple handles in my process.

Please help me to solve this issue or give some tips...

Upvotes: 3

Views: 788

Answers (2)

Kirill V. Lyadvinsky
Kirill V. Lyadvinsky

Reputation: 99685

Why do you need to create same file twice in the same process? You could use one handle in all I/O functions of your process without reopening file. If you need to pass the handle to another process you could use DuplicateHandle function.

Upvotes: 2

sbk
sbk

Reputation: 9508

I don't think you can do that. The closest you can get is to use CreateFile to open/lock the file the first time and then use DuplicateHandle to create multiple handles from the one you already have

Upvotes: 1

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