Help me with this?

Question

I have been following you how to make a "Home Screen" but i'm getting this error

Answer 1

Have you added an image called logo.png in the client project? If not, that could explain why stream is returned as null, and results in the error you see.

For anyone else reading this thread, here's a link to the article.

http://blogs.msdn.com/b/lightswitch/archive/2011/09/06/course-manager-sample-part-6-home-screen-andy-kung.aspx

Tim

 

Answer 2

Have you set the "logo.png" file to be an Embedded Resource? They have to be Embedded. Ordinary Resources can't be used with the GetImageByName function.

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Simon Jones

Answer 3

yes I have add a logo.png in the Client Project and also Change BuildAction to Embedded Resource

Answer 4

Is the logo file directly in the Client Project's Resources folder, in a folder under Resources or in another folder?

I know this works when the file is directly in the Resources folder and I know that people using C# have to put the path to the file as well as the file name in the call to the GetImageByName function.

Also, check you have got the name absolutely right with no differences, not even in capitalisation.

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Simon Jones
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Answer 5

Hi Kabayan,

I was looking at your attachment above and I understand that you have included your imagehelper code in the home screen itself.  I suggest that you should add your separate imagehelper code in the "Client-UserCode".  

1. Go to File View

2. expand Client node

3. Rigth click on the UserCode folder

4. Click Add New Item

5. Select Class

6. Name your class as "ImageHelper"

7. then Copy/Cut your imagehelper code you used above

 

Hope this will solve your problem

 

Rkage

Answer 6

This is the code we use which seems to avoid the error you get. It returns nothing rather than throwing an error if the image can't be found. You might want to compare this code with the code you are using.

Public Class MyImageHelper
 
    Public Shared Function GetImageByName(fileName As String) As Byte()
        Dim assembly As Reflection.Assembly = Reflection.Assembly.GetExecutingAssembly()
        Dim stream As Stream = assembly.GetManifestResourceStream(fileName)
        Return GetStreamAsByteArray(stream)
    End Function
 
    Private Shared Function GetStreamAsByteArray(ByVal stream As System.IO.Stream) As Byte()
        If stream IsNot Nothing Then
            Dim streamLength As Integer = Convert.ToInt32(stream.Length)
            Dim fileData(streamLength - 1) As Byte
            stream.Read(fileData, 0, streamLength)
            stream.Close()
            Return fileData
        Else
            Return Nothing
        End If
    End Function
 
End Class

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Simon Jones
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Answer 7

Please put at least a short description of what you want help with in the question, rather than just "Help Me With This".

That doesn't help those searching for a similar issue, & it doesn't help those of us who would like to assist you either.

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Yann - LightSwitch Central

(plus ça change, plus c'est la même chose!)

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This will help people find the answers that they're looking for more quickly.

Answer 8

Sir kabayan and Sir Simon Jones,

Kabayan Salamat kaayo and SIr Simon Thank you

God Bliss and more power.