FtpWebRequest async giving me file lock problems

Question

Hi All!

i have written a small app that:

-Periodically captures a portion of a screen to jpeg file

-Uploads this file to ftp server

At first i used 

My.Computer.Network.UploadFile

and it worked like a charm. Then i wanted to move to FtpWebRequest async. The reason was because i implemented a global keyboard hook and locking the main thread for upload, disabled my keyboard.

I copied the example in MSDN regarding FtpWebRequest. the problem i have is that it seems that the file that is being uploaded is locked even after the stream is closed.

MSDN code used: FtpWebRequest MSDN

The timer calls a function to upload the image. In that function a bitmap is created and finally:

bm_dest.Save(imgFile, ImageFormat.Jpeg)

and after that i am calling the sub for async ftp upload based on msdn example. After one or two successful uploads, i get a general GDI+ exception which comes because "the file is being used from another process"..If i save to a new file is ok.

I have tried with long intervals in timer (>minute) and it does the same. The file is small (usually 40-50 kb)

I tested that the stream is closed and tried to press the upload manually 10 secs after and i got the same error.

I can't figure out what is happening...

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Elias

Answer 1

Check your program again and again, there must be a operation locking the file.

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Ghost,
Call me ghost for short, Thanks
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