[RESOLVED] Converting code question?

[VBDT]

Hi guys, I use VB.Net and I need to convert this VB 6 code to VB.Net.

Type WAVEINCAPS
   wMid As Integer
   wPid As Integer
   vDriverVersion As Long
   szPname As String * 32
   dwFormats As Long
   wChannels As Integer
End Type

The only problem I have is this line

szPname As String * 32

Is this some sort of indication of a size?
Thanks in advance!

[Kal-El]

I think you are in the wrong forum...but my small knowladge of VB. net tells me that you need to see something about Marshal to allocate stuff, see this, translated in to something like this:

Dim MyPointer As string =  Marshal.AllocHGlobal(4)
Marshal.WriteInt32(MyPointer, 255)
 ' some more code here (call to 
' unmanaged code for example)
 ' free memory
Marshal.FreeHGlobal(MyPointer)

Note: Code not tested

[Lord Orwell]

Yes that is an indicator of size. It dimensions a string 32 bytes long.
for that one line, here is the equivalent vb.net line:

<VBFixedString(33),System.Runtime.InteropServices.MarshalAs(System.Runtime.InteropServices.UnmanagedType.ByValArray,SizeConst:=32)> Public szPName() As Char

note that i have it set to 33. that is because a string has a terminating null bit, and marshallas doesn't take that into account and you have to manually set it.

[VBDT]

Thank you Lord Orwell. That is what I was thinking. One more question, Is VBFixedString(33) needed? I saw a C# example that didn't have VBFixedString class instance.

[Lord Orwell]

i am by no means an expert, but that is supposedly how it knows what size to make the fixed string.
I have no idea what you are using the structure for, so i can't say any more than that.

[VBDT]

Well, I am tring to use this structure in "waveInGetDevCaps" Api function. The reason I ask because I saw a C# example that didn't have VBFixedString class instance. Anyways thank you very much.