VB - API Call Retrieves Byte Array

[Jason Weier]

All,

I have an unmanaged DLL written in C++ that I need to call using VB.NET. Specificly, the application I am developing will pull files from a handheld recording device. I have several other function working properly that provide information and verify connectivity, but I am having problem with the one function I really need...

Here is the C++ function description from the documentation:

DWORD DSXGetFileInfoFirst(BYTE bFolder, BYTE *bpHeaderBuffer)

bFolder - BYTE: Specifies the folder from which the file information is obtained.

bpHeaderBuffer - BYTE *: Specifies a pointer to the buffer in which to receive the file information. The buffer must be at least 1,024 bytes in size


Here is my implementation (or attempt at one...) in .NET:

Declare Function DSXGetFileInfoFirst Lib "DSXUSB.DLL" (ByRef bFolder As Integer, ByRef pbHeaderBuffer() As Byte) As Integer

Sub GetFiles()

Dim ret as Integer
Dim HBuffer(1024) As Byte

ret = DSXGetFileInfoFirst(1, HBuffer)

End Sub


When I call this, the DLL returns an generic exception which is probably an invalid parameter. My question then, would be is there a special I will have to do to be able to recieve the byte array? Any help/advice at this point would be greatly appreciated.

[Killer42]

Was this ever resoved?

I haven't worked with .Net yet, but I did notice you define your first parameter as Integer when it was Byte in C.