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POFile.Open for read access denied on executing file in Windows
primarykey
Id
7007671
data
AcceptedAnswerId
7007790
AnswerCount
4
ClosedDate
CommentCount
6
CommunityOwnedDate
CreationDate
2011-08-10T08:09:02.880
FavoriteCount
1
LastActivityDate
2012-11-07T15:02:00.137
LastEditDate
2011-08-10T09:14:09.530
LastEditorUserId
104776
OwnerUserId
104776
ParentId
0
PostTypeId
1
Score
3
ViewCount
11716
LastEditorDisplayName
text
Body
I have a problem with file permissions on executing files in Windows that seems to be solved after following a forum tip[1], but I cannot understand why. Maybe you guys can help. I'm checking the banner of a file by executing it (reading the console output) and then opening the same file for reading afterwards using FileStream: <pre><code>public void fileMD5(string filename) { if (!File.Exists(filename)) return NT.Fail("File does not exist: " + filename); BinaryReader stream = new BinaryReader(File.Open(filename, FileMode.Open, FileAccess.Read, FileShare.ReadWrite)); int bufferSize = 4096; byte[] buffer = new byte[bufferSize]; int readBytes; while ((readBytes = stream.Read(buffer, 0, bufferSize)) > 0) { md5Hasher.TransformBlock(buffer, 0, readBytes, buffer, 0); } stream.Close(); } fileMD5('sample.exe'); </code></pre> and every once in a while I would get "file is being used by another process". From Wikipedia I know that Windows will set a lock on executing files denying write access[2], but I'm only reading. Also the process should have stopped already when I try to open it. From the forum post it would seem that adding a FileShare.ReadWrite would help and it seems that It does: <pre><code>FileStream stream = File.Open('sample.exe', FileMode.Open, FileAccess.Read, FileShare.ReadWrite); </code></pre> But I don't understand why. Is there a race condition here that I don't see? Also the File.Open call seems to be much quicker with FileShare.ReadWrite instead of the default (which I guess is FileShare.Read). [1] <a href="http://www.xtremevbtalk.com/archive/index.php/t-192118.html" rel="nofollow">http://www.xtremevbtalk.com/archive/index.php/t-192118.html</a> [2] <a href="http://en.wikipedia.org/wiki/File_locking#In_Microsoft_Windows" rel="nofollow">http://en.wikipedia.org/wiki/File_locking#In_Microsoft_Windows</a>
Tags
<c#><windows><file-locking>
Title
File.Open for read access denied on executing file in Windows
singulars
PostAcceptedAnswerId
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
PostParentId
1. This table or related slice is empty.
PostTypePostTypeId
1. PTQuestion
UserLastEditorUserId
1. USVegar Westerlund
UserOwnerUserId
1. USVegar Westerlund
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PostLinksPostIdRelatedPostId
1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. PO
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 PostTypePostTypeId
 PTAnswer
2. PO
 singulars
 PostTypePostTypeId
 PTAnswer
3. PO
 singulars
 PostTypePostTypeId
 PTAnswer
VotesPostIdCreationDate
1. VO
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 PostPostId
 POFile.Open for read access denied on executing file in Windows
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTUpMod
CommentsPostId

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