Hi ng,
I have a very strange problem within my c# application:
One of the (background) Threads in my application is responsible for some
image processing tasks (like resizing, clipping, ..) on a list of files.
Therefore, some temporary files are created which should be deleted after
processing is finished.
This Thread is called several times. When I call it the first time,
everything's ok and no errors occur.
In the second call, I can observe very strange behaviour: I cannot delete
the temporary files created by this thread, but I'm sure that all image and
bitmap-objects are disposed after processing (with this method,which is, I
think more than should be necessary to release the file lock)
private static void DisposeImage(Im age image)
{
image.Dispose() ;
image = null;
GC.Collect();
}
Did anyone observe similar behaviour? Does anyone have any ideas what could
be the reason for this annoying file locks (e.g. error in threading or
whatever..)
Or, how could a workaround look like (which means how can I unlock a file
which was created by the same thread)
thx,
Albert 4 13630
You should always make sure that you close the streams used to load the
images as well.
Maybe that is the problem you're experiencing?
--
Patrik Löwendahl [C# MVP] http://www.lowendahl.net/ || http://www.cshrp.net
Albert Greinöcker wrote: Hi ng,
I have a very strange problem within my c# application: One of the (background) Threads in my application is responsible for some image processing tasks (like resizing, clipping, ..) on a list of files. Therefore, some temporary files are created which should be deleted after processing is finished. This Thread is called several times. When I call it the first time, everything's ok and no errors occur. In the second call, I can observe very strange behaviour: I cannot delete the temporary files created by this thread, but I'm sure that all image and bitmap-objects are disposed after processing (with this method,which is, I think more than should be necessary to release the file lock) private static void DisposeImage(Im age image)
{ image.Dispose() ; image = null; GC.Collect(); }
Did anyone observe similar behaviour? Does anyone have any ideas what could be the reason for this annoying file locks (e.g. error in threading or whatever..) Or, how could a workaround look like (which means how can I unlock a file which was created by the same thread)
thx, Albert
Thanks for your response...
The only two ways I'm opening the images is either
Image img = Image.FromFile( filePath);
Or with a copy constructor
Are in this case any additional closing steps necessary?
""Patrik Löwendahl [C# MVP]"" <pa************ *************** ***@home.se>
schrieb im Newsbeitrag news:OX******** ******@tk2msftn gp13.phx.gbl... You should always make sure that you close the streams used to load the images as well.
Maybe that is the problem you're experiencing?
-- Patrik Löwendahl [C# MVP] http://www.lowendahl.net/ || http://www.cshrp.net
Albert Greinöcker wrote: Hi ng,
I have a very strange problem within my c# application: One of the (background) Threads in my application is responsible for some image processing tasks (like resizing, clipping, ..) on a list of files. Therefore, some temporary files are created which should be deleted after processing is finished. This Thread is called several times. When I call it the first time, everything's ok and no errors occur. In the second call, I can observe very strange behaviour: I cannot delete the temporary files created by this thread, but I'm sure that all image and bitmap-objects are disposed after processing (with this method,which is, I think more than should be necessary to release the file lock) private static void DisposeImage(Im age image)
{ image.Dispose() ; image = null; GC.Collect(); }
Did anyone observe similar behaviour? Does anyone have any ideas what could be the reason for this annoying file locks (e.g. error in threading or whatever..) Or, how could a workaround look like (which means how can I unlock a file which was created by the same thread)
thx, Albert
I'm not a 100% for the implementation of file reading in GDI.
But I would try not to use a filename but instead use a filestream which
you could explicitly close.
--
Patrik Löwendahl [C# MVP] http://www.lowendahl.net/ || http://www.cshrp.net
Please reply only to the newsgroup.
Albert Greinöcker wrote: Thanks for your response...
The only two ways I'm opening the images is either
Image img = Image.FromFile( filePath);
Or with a copy constructor
Are in this case any additional closing steps necessary? ""Patrik Löwendahl [C# MVP]"" <pa************ *************** ***@home.se> schrieb im Newsbeitrag news:OX******** ******@tk2msftn gp13.phx.gbl...
You should always make sure that you close the streams used to load the images as well.
Maybe that is the problem you're experiencing?
-- Patrik Löwendahl [C# MVP] http://www.lowendahl.net/ || http://www.cshrp.net
Albert Greinöcker wrote:
Hi ng,
I have a very strange problem within my c# application: One of the (background) Threads in my application is responsible for some image processing tasks (like resizing, clipping, ..) on a list of files. Therefore, some temporary files are created which should be deleted after processing is finished. This Thread is called several times. When I call it the first time, everything 's ok and no errors occur. In the second call, I can observe very strange behaviour: I cannot delete the temporary files created by this thread, but I'm sure that all image and bitmap-objects are disposed after processing (with this method,which is, I think more than should be necessary to release the file lock) private static void DisposeImage(Im age image)
{ image.Dispose() ; image = null; GC.Collect(); }
Did anyone observe similar behaviour? Does anyone have any ideas what could be the reason for this annoying file locks (e.g. error in threading or whatever..) Or, how could a workaround look like (which means how can I unlock a file which was created by the same thread)
thx, Albert
I'm also not very happy with the GDI-implementation. ..
which alternative would you advice?
""Patrik Löwendahl [C# MVP]"" <pa************ *************** ***@home.se>
schrieb im Newsbeitrag news:%2******** ********@TK2MSF TNGP12.phx.gbl. .. I'm not a 100% for the implementation of file reading in GDI.
But I would try not to use a filename but instead use a filestream which you could explicitly close.
-- Patrik Löwendahl [C# MVP] http://www.lowendahl.net/ || http://www.cshrp.net Please reply only to the newsgroup.
Albert Greinöcker wrote: Thanks for your response...
The only two ways I'm opening the images is either
Image img = Image.FromFile( filePath);
Or with a copy constructor
Are in this case any additional closing steps necessary? ""Patrik Löwendahl [C# MVP]"" <pa************ *************** ***@home.se> schrieb im Newsbeitrag news:OX******** ******@tk2msftn gp13.phx.gbl...
You should always make sure that you close the streams used to load the images as well.
Maybe that is the problem you're experiencing?
-- Patrik Löwendahl [C# MVP] http://www.lowendahl.net/ || http://www.cshrp.net
Albert Greinöcker wrote:
Hi ng,
I have a very strange problem within my c# application: One of the (background) Threads in my application is responsible for some image processing tasks (like resizing, clipping, ..) on a list of files. Therefore , some temporary files are created which should be deleted after processing is finished. This Thread is called several times. When I call it the first time, everything' s ok and no errors occur. In the second call, I can observe very strange behaviour: I cannot delete the temporary files created by this thread, but I'm sure that all image and bitmap-objects are disposed after processing (with this method,whic h is, I think more than should be necessary to release the file lock) private static void DisposeImage(Im age image)
{ image.Dispose() ; image = null; GC.Collect(); }
Did anyone observe similar behaviour? Does anyone have any ideas what could be the reason for this annoying file locks (e.g. error in threading or whatever..) Or, how could a workaround look like (which means how can I unlock a file which was created by the same thread)
thx, Albert
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