WebService Results

[angula]

I have a windows app which calls webservice functions on my server. If the functions runs successfully, it returns a dataset to my client app. What I want to know is how to get error messages from the webservice in the event the function does not run correctly to display in a msgbox on the client.

 

I have something similar to below:

 

<WebService> Public Function ReturnDataset(ByVal UserName) as Dataset

 

...function logic works

 

ReturnDataset = dataset

 

...function logic fails

 

???

 

End Function

 

 

 

Any thoughts?

[Robby]

You can 'Throw New Exception" or Return Nothing, in cassse of the latter you would always need to check for the case of the return being Nothing.

[angula]

I'm not following.

 

Are you saying that the web service would like something like this:

 

<WebService>Public Function GetClientUpdates() as dataset

 

Try

...logic to generate dataset

 

GetClientUpdates = dataset

 

Catch ex as Exception

Throw New Exception

 

End Try

 

 

Then my client looks like below...

 

 

Public Sub GetClientUpdates()

ws.BeginClientUpdatesToClient(" ", "", "", "10:45:00 07/3/00", AddressOf GetClientUpdatesCompleteInvoke, Nothing)

End Sub

 

Protected Sub GetClientUpdatesCompleteInvoke(ByVal ar As IAsyncResult)

Me.Invoke(New GetClientUpdatesDelegate(AddressOf Me.GetClientUpdatesComplete), New Object() {ar})

End Sub

 

Protected Delegate Sub GetClientUpdatesDelegate(ByVal ar As IAsyncResult)

Protected Sub GetClientUpdatesComplete(ByVal ar As IAsyncResult)

Try

Dim dsTemp As New Mohawk.MohawkWebServices.dsItems

dsTemp = ws.EndClientUpdatesToClient(ar)

 

dsI.Merge(dsTemp)

UpdateComplete = dsTemp.Items.Count

 

Catch ex As Exception

UpdateComplete = 0

End Try

 

End Sub

 

This is not working for me....