Fixing OLE_HANDLE values of Bitmap properties for commands, tools, and dockable windows

Summary
Using the Visual Basic Upgrade Wizard in Visual Studio to auto-translate Visual Basic 6 (VB6) code to Visual Basic .NET (VB.NET) is not 100 percent automated. This topic shows ArcGIS developers how to manually correct code where VB6 OLE_HANDLE values that do not work after the auto-translation.

About fixing OLE_HANDLE values

The following are example VB .NET errors:
  • Error 1 Class 'clsAlgColorRamp' must implement 'ReadOnly Property Bitmap() As Integer' for interface 'ESRI.ArcGIS.SystemUI.ICommand'. Implementing property must have matching 'ReadOnly' or 'WriteOnly' specifiers.
  • Error 2 Type 'ESRI.ArcGIS.esriSystem.OLE_HANDLE' is not defined.
The following is the cause of the VB .NET error:
  • The wrong return data type is not translated correctly by the upgrade wizard for properties and functions that return an esriSystem.OLE_Handle. In VB .NET, it is System.Int32. Change the return data type to the correct data type.
The following is the original VB6 code:
[VB6] 
Private Property Get ICommand_Bitmap() As esriSystem.OLE_HANDLE
End Property
The following is the auto-translated code to VB .NET:
[VB.NET] 
'Initial auto-translated VB .NET conversion.
Private ReadOnly Property ICommand_Bitmap() As ESRI.ArcGIS.esriSystem.OLE_HANDLE Implements ESRI.ArcGIS.SystemUI.ICommand.Bitmap
Get
End Get
End Property
[VB.NET] 
'Correct VB .NET translation.
Private ReadOnly Property ICommand_Bitmap() As System.Int32 Implements ESRI.ArcGIS.SystemUI.ICommand.Bitmap
Get
End Get
End Property


See Also:

Migrating from VB6 to VB.NET
General steps for migrating from VB6 to VB.NET



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