Waiting for a response from an event

[Drstein99]

Hello all, I know what I need to do, I just don't know how to code it in vb.net, please help.

 

 

I have a function that sends a message to another computer using a function in a dll file. I dont want to complete the function, untill the .dll returns a response. So i basically need to halt the program while I wait for a response. Not complete halt, just the flow of the application inside this function.

 

Please help!

-----------------------------------------------------

For example:

 

PUBLIC FUNCTION esStart

 

customDll.Start ("procedure start")

'

'this is where i need to wait for a response from an event

'

' WHEN MsgReceived - continue

 

END SUB

 

PUBLIC FUNCTION received (byval Test AS Object) handles customDll.MsgReceived

 

'this function is called when the program flow should continue

'

'MsgRecieved - CONTINUE!

 

END FUNCTION

 

 

------------------

[dynamic_sysop]

something like this maybe ...

Private ReceivedResponse As Boolean = False

Public Sub esStart 

customDll.Start ("procedure start") 

While Not ReceivedResponse
   Application.DoEvents()
End While

'/// when ReceivedResponse becomes True , carry on.

End Sub

Public Function received (byval Test AS Object) handles customDll.MsgReceived 

ReceivedResponse = True

End Function

[Drstein99]

that looks like it may do the trick. I'll also need to probably do some type of timeout. Thanks.

[techmanbd]

that looks like it may do the trick. I'll also need to probably do some type of timeout. Thanks.

 

How about trying this

 

Dim timeit As Integer = Environment.TickCount

 

While Not ReceivedResponse

if Environment.TickCount - timeit >= whateverMillisecondshere then

exit while

end if

Application.DoEvents()

End While

 

' and then to tell them there wasn't a response

 

if not recievedresponse then

messagebox.show("NO RESPONSE")

end if

[Horace]

Upstairs's answer is very good

 

I have a try about his code,whith is very good one.

Thanks him for his super code and I hope he can help me in the future.

[Drstein99]

not recognizing application.doevents in the form of my .dll

[mutant]

When creating a DLL project the Windows.Forms assembly is not imported by default, and that is where Application class is. You need to import the assembly.