VB - Manually stop a do while loop

logic

Wonder if anyone can help me with this, I need to try and stop a do while loop manually, I have one button to start the loop and another to stop it. I have tried this

Do while button_Start.enabled = false
.....
Loop

In the stop button event I have set button_start.enabled = True but
this just causes the application to stop responding and doesn't exit.

AARRRGH

This isn't VB specific, but could you not make the while not true?

e.g.

Do {

whatever

} while(x>0)

Just make x equal 0 or less than 0.

humbert

While not button.enabled
...
end while

should be working, sure the code isn't getting suck somewhere inside the loop?

dazberry

The stop button event isn't firing because the message loop isn't being processed because you're locked into the while loop (remember that Win32 GUI is single threaded). VB has something like a DoEvents call (in Delphi its Application.ProcessMessages) - if you put this in your while loop your stop button event should then fire.

D.

humbert

Ah, good call. Should have spotted that!

logic

Thanks Dazberry, that done the trick. I had seen do events before in some one elses code but didn't understand what it did.