Errorlabel

Erel

B4X founder

Staff member

Licensed User

Longtime User

• Nov 17, 2010

• #2

Basic4android uses Try... Catch... End Try blocks.
For example:

B4X:

    Try
        Dim in As InputStream
        in = File.OpenInput(File.DirInternal, "SomeMissingFile.txt")
        '...
    Catch
        Log(LastException)
    End Try
    If in.IsInitialized Then in.Close

When an exception is raised inside the Try... Catch block, the execution of this block stops and it continues in the Catch... End Try block. If no exception is raised then the Catch... End Try will not be executed.
You can use the LastException predefined object to get more information about the exception.

 

Upvote 0

derez

Expert

Licensed User

Longtime User

• Nov 17, 2010

• #3

Thanks

 

Upvote 0

L

linum

Active Member

Licensed User

• Nov 18, 2010

• #4

I'm going to wet my pants... I love the "Try" method and I was always wishing it was available on Basic4PocketPc. Will it ever be implemented on B4PPC?

 

Upvote 0

derez

Expert

Licensed User

Longtime User

• Nov 18, 2010

• #5

Don't do that, hold on...
What is wrong with errorlabel in b4ppc ? it catches the errors and sends the program to a label - it is about the same !

 

Upvote 0

M

mjcoon

Well-Known Member

Licensed User

• Nov 18, 2010

• #6

derez said:

What is wrong with errorlabel in b4ppc ? it catches the errors and sends the program to a label - it is about the same !

Click to expand...

Functionally the same, as is the use of GoTo to produce the same effect as If ... Then ... Else.

And have you never forgotten to put a Return statement before the errorlabel, so that the error is triggered every time? What, never?

Mike.

 

Upvote 0

Erel

B4X founder

Staff member

Licensed User

Longtime User

• Nov 19, 2010

• #7

Will it ever be implemented on B4PPC?

Click to expand...

Don't know for now...

 

Upvote 0