Object Reference Error

I'm getting the following error

Quote:

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Object Reference not set to an instance of an object

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On this line of code

VB Code:

Private Declare Function ImageDirectoryEntryToData Lib "dbghelp.dll" (ByVal pBase As Long, ByVal bMappedAsImage As Long, ByVal DirectoryEntry As Int32, ByRef Size As Long) As Long
 
Private Structure IMAGE_EXPORT_DIRECTORY
        Public Characteristics As Long
        Public TimeDateStamp As Long
        Public MajorVersion As Int32
        Public MinorVersion As Int32
        Public lpName As Long
        Public Base As Long
        Public NumberOfFunctions As Long
        Public NumberOfNames As Long
        Public lpAddressOfFunctions As Long
        Public lpAddressOfNames As Long
        Public lpAddressOfNameOrdinals As Long
    End Structure
 
Const IMAGE_DIRECTORY_ENTRY_EXPORT = 0
Private lngBaseAddress As Long
 
Dim pExportDirectory As Long
Dim lngSize As Long
 
pExportDirectory = ImageDirectoryEntryToData(lngBaseAddress, 1, IMAGE_DIRECTORY_ENTRY_EXPORT, lngSize)[color=red]<----- This line[/color]

I am creating an application that allows the user to load a .dll file via the OpenFileDialog control. Then they click a button to enumerate the Functions in that dll.

Any ideas why I would be getting this error??? I created this application just fine in VB6 and have made all the necessary modifications to rewrite it in VB.NET, but am getting this error for some reason???

A Long in .net is now an Integer. Change the APIs so they return integers, and the structure should probly be ints as well.
The .net equivalent of the integer, is now a short.
An int32 is the same as the .net integer (the old VB6 long).

Of course, it could be something else, but my bets on that.

well, that fixed that problem...now I have another error

Quote:

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System.Argument Exception
"The parameter is incorrect"

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VB Code:

Private Declare Function MoveMemory Lib "kernel32.dll" Alias "RtlMoveMemory" (ByRef Dest As Object, ByRef Src As Object, ByVal Size As Int32) As Int32
 
Private Structure IMAGE_EXPORT_DIRECTORY
     Public Characteristics As Int32
     Public TimeDateStamp As Int32
     Public MajorVersion As Short
     Public MinorVersion As Short
     Public lpName As Int32
     Public Base As Int32
     Public NumberOfFunctions As Int32
     Public NumberOfNames As Int32
     Public lpAddressOfFunctions As Int32
     Public lpAddressOfNames As Int32
     Public lpAddressOfNameOrdinals As Int32
End Structure
 
Dim pExportDirectory As Int32
Dim ExportDirectory As IMAGE_EXPORT_DIRECTORY
 
MoveMemory(ExportDirectory, pExportDirectory, Len(ExportDirectory)) [color=red]<---- This line [/color]
 
'The values being pass into the function are:
'ExportDirectory = ProjectName.Form1 + IMAGE_EXPORT_DIRECTORY
'pExportDirectory = 1431884864
'Len(ExportDirectory) = 44