Pass byte array from vb.net to unmanaged code

[RGarg06]

Hi,

I am trying to read a buffer from a file and then pass that buffer to a
C++ dll as follows. While debugging it tells me that byte array
received is a Bad Ptr. Any help will be appreciated.

VB code:

Dim bytes(511) As Byte
Dim stream As Stream
Dim bytesReadFromStream As Integer
stream = New FileStream("C:\abc.bak", FileMode.Open,
FileAccess.Read)

bytesReadFromStream = stream.Read(bytes, 0, 512)

While bytesReadFromStream > 0

SendBytesToFn(bytesReadFromStream , bytes)

bytesReadFromStream = stream.Read(bytes, 0, 512)

End While

stream.Close()

<System.Runtime.InteropServices.DllImport("MyDll.d ll",
CharSet:=System.Runtime.InteropServices.CharSet.Au to)> _
Private Sub SendBytesToFn(ByVal bytesTransferred As Int64, ByVal
bytes() As Byte)

End Sub
C++ Code:

extern "C" MYDLL_API void SendBytesToFn(DWORD bytesTransferred, BYTE*
bytes)
{
// bytes here come as Bad Ptr

}

[Mattias Sjögren]

> Private Sub SendBytesToFn(ByVal bytesTransferred As Int64, ByVal bytes() As Byte)
^^^^^

Should be an Int32 (or UInt32).
Mattias

--
Mattias Sjögren [C# MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
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