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Is there a way to unlock a .jpg file that is being used by another application? VB.NET
Hi, i have made an application that grabs the screen and then saves the file to my desktop.
This jpg created is being used by another application to send it to mobile phones via a Bluetooth proximity application.
Problem is, when i open the file in the Bluetooth application to send it, if i run MY application to recreate the screen grab then i get an error that the file is being used by an other application.
Is there a way to overwrite the jpg WITHOUT closing the Bluetooth app? There is NO way altering the Bluetooth app to do that.
Thanks
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Answers
Yes, after sending the file, even if you remove it from the Files List to be send, the file remains locked, so maybe there is a bug in the BT app.
That's why i am asking if there is a way to unlock the file, i don't think that the BT app need the file to be locked, since it's sent over.
By the way, i use VB2008 express
Ok this is probably a bit of a hack but I use this program for unlocking locked files manually
http://ccollomb.fr
Appar
Ultmatley though there must be a Win API for this.
You can use API heres how:
Call NtQuerySystemInformation with the SystemHandleInformation class.
This returns you an array of SYSTEM_HANDLE_INFORMATION.
The SYSTEM_HANDLE_INFORMATION has processid and handle information
that can be used for parsing. What you need to do is search the array of handles for the
process id that matches the blue tooth device and then dump all the handles which have a
object type of "File". You will need to use DuplicateHandle() for the handle to work in your
context and specifying DUPLICATE_CLOSE_SOURCE in DuplicateHandle() will force the close.
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by: Dov_LandauPosted on 2009-06-24 at 06:57:20ID: 24701095
Hello,
The lock is designed exactly for this situation, that one application should not change the file while the 2nd app uses the file's data. The question is: does the bluetooth app hold the lock on the file infinitely - even after the transfer has finished? Do you mean to say that you want to bypass a bug in the bluetooth app?