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Multi User File Open / Partial File Locking Winnt

Posted on 1998-11-05
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Last Modified: 2012-05-04
Greetings,
I am trying to get my database project started. Since I am building the multi-user database application I have know the best solution for allowing 2 or more users to write to the file. Is there a windows nt function that can do so? also can i partially lock a section of the file?
Thank you.
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Question by:misha051797
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4 Comments
 
LVL 1

Expert Comment

by:TheGrinch
ID: 1177065
You say "database project" but then talk only about files. Which is it? Considerations with a database are quite different from those with files.
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LVL 86

Expert Comment

by:jkr
ID: 1177066
Well, 'LockFile()' allows you to lock prtions of a file...
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Author Comment

by:misha051797
ID: 1177067
TheGrinch,
Cood point. What I am trying to do is to allow multi user access to the file.
I do not want an application to lock file, so other users can't read/write to the file.
I guess there must be a simple solution to what I am trying to do. Right?
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Accepted Solution

by:
guga earned 50 total points
ID: 1177068
When you open file with help of CreateFile function(Win32 API) u need use flags FILE_SHARE_READ|FILE_SHARE_WRITE.
U can read this file wihout sharing violation error.

hFile=CreateFile("data.base",
                 GENERIC_READ|GENERIC_WRITE,
                 FILE_SHARE_READ|FILE_SHARE_WRITE,
                 NULL,
                 OPEN_EXISTING,
                 FLAG_ATTRIBUTE_NORMAL|FILE_FLAG_OVERLAPPED,
                 NULL);
but when somebody want to write into file LockFile() needed. This
is unique solution to avoid conflict.
0

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