Structures and Late Binding

[dpflagg]

I have a data structure that is known at compile time, so I thought I would put it in a structure. However, it seems like I am late binding, but I have no intention to (I didnt even know what it was before I got an error, because the Compact Framework doesnt support it).

Here is a snippet:



[VB]
Enum commandEnum
ReadCommand
WriteCommand
OtherCommand
End Enum

Public Structure commandStruct
Dim commandType As commandEnum
Dim commandCode As String
Dim numBytes As Integer
Dim text As String
Public Sub New(ByVal commandType As commandEnum, _
ByVal commandCode As String, _
ByVal numBytes As Integer, _
ByVal text As String)
Me.commandType = commandType
Me.commandCode = commandCode
Me.numBytes = numBytes
Me.text = text
End Sub
End Structure

Public resetCommand = New commandStruct(commandEnum.OtherCommand, "0x01", 0, "Reset MPU")
[/code]


Now, when I try to access the data, like txtBox.Text = resetCommand.text, it says Im late binding.

How should I be doing this differently?

Thanks!

 

[srinivasulu]

Hi
Its late binding coz you havent given the type while declaring the object.

try this

Public resetCommand As commandStruct

resetCommand = New commandStruct(commandEnum.OtherCommand, "0x01", 0, "Reset MPU")

Then try to access the structure!

 

[dpflagg]

But this declares the structure twice, which is not allowed ...

 

[Volte]

No, you are declaring it once, and then setting that variable to a new instance. When you declare a structure or class without setting it to New, you are creating a null reference to a commandStruct, meaning that it points nowhere, and you cant use any non-static class members. Once you use New, it creates a new instance and assigns it to the reference variable, rendering it usable.

This creates an empty (null) reference to a commandStruct
Public resetCommand As commandStruct

This creates an instance of a commandStruct and makes resetCommand reference it
resetCommand = New commandStruct(commandEnum.OtherCommand, "0x01", 0, "Reset MPU")