Marshal gethrforexception vb net

Marshal gethrforexception vb net

By: webber007 On: 22.07.2017

Is there a method to verify that a file is open? IO and the following code under class named Wallet. There is really no point using a 'is file in use check' function since you will still need to have try catch to handle the case that the file fails to open. The file open can fail for many more reasons than it just being already open.

Also using a function to do a check is no guarantee of success. The 'is file in use check' might return false only for the file open to fail with a file already open error, because in time between the check and trying to open the file it was opened by someone else.

It looks like the two suggestions from this MSDN forum posting both involve trying to open the file.

fuwababe.web.fc2.com - How to check if the text file is open and close the text file? - Stack Overflow

The first one is similar to what you are doing now, and the second involves using a Windows API function CreateFile and checking for a invalid handle signifying the file is in use. In both cases they are relying on an error condition to determine if the file is open or not. In short, in my opinion the method you are using is correct since there is not a System. Thank you for your interest in this question. Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site the association bonus does not count.

Would you like to stock market performance historical chart one of these unanswered questions instead?

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Log In Sign Up. Join the Stack Overflow Community. Stack Overflow is a community of 7. Join them; it only takes a minute: Close Catch e As Binary option range trading 'Note sure if this is the proper way. End Try Return 0D End Function Any pointers will be appreciated!

Dayan 3, 6 25 There is no direct way to detect a file is opened. This is what I have asked stackoverflow. So there's no way to really know if a file is currently opened or not? I would just add that you need to be sure to stream. It says Marshal is not declared. InteropServices; to fix the Marshal is not declared issue.

winforms - fuwababe.web.fc2.com Checking if a File is Open before proceeding with a Read/Write? - Stack Overflow

Marshal will have a blue little underline, hover the mouse over this and it will give you a hint as to what is wrong! Could you please elaborate more on how to use the code JeremyThompson. Now it says Value of type 'String' cannot be converted to 'System.

Marshal Class

The goal of SE sites is to become a resource of knowledge, of answers, for years to come. Most importantly, if your link were to ever break, your answer is useless for anyone who visits this page in the future. Cheers for the link tho! JeremyThompson I aware of that and I do.

In this case I made a conscious decision not to paste in any code. I was not trying to suggest that this was the proper way to go. I was trying to reassure the OP that the way that he was doing it was correct, IMHO.

Suggesting that he use the WinApi was not what I was trying to do and in this case overkill. Thank you Mark, i appreciate your answer and i agree that it is overkill but it did give me a good outlook on the subject! Intrus Glad I could help. Stack Overflow works best with JavaScript enabled.

Hi Mark, I'm sure your aware it's customary in StackOverflow answers to include a summary of the contents of a link or the highlights that specifically answer the question.

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