Unmanaged To Managed - Please Help

[kevinwebster83]

Hi

Please could someone help me with the following, i'm trying to port the unmanaged C++ below into either VB.Net or C# (i don't mind which).

 
typedef struct {
  U32 Size;
  U32 Start;
  U32 Reserved1;
  U32 Reserved2;
} EVENT_INFO;
 
typedef enum {
  EVENT_ERASE,
  EVENT_PROGRAM,
  EVENT_VERIFY
} EVENT_TYPE;
 
typedef void EVENT_FUNC(EVENT_TYPE event, const EVENT_INFO * info);
 
STDCALL void SetProgressEvent (EVENT_FUNC * eventFunc);
 
 

For clarity, i will post the code i have written so far in a reply. Basically, all the above code does is provide feeback on erase, write and verify cycles when programming a microprocessor.

Thanks in advance

Kev

[kevinwebster83]

The code i have so far is...

 
Friend Structure ProgressInformation
    Public Size As UInt32
    Public Start As UInt32
    Public Reserved1 As UInt32
    Public Reserved2 As UInt32
End Structure
 
Friend Enum ProgressEvent
    ChipErase
    Program
    Verify
End Enum
 
<UnmanagedFunctionPointer(CallingConvention.StdCall)> _
Public Delegate Sub ProgressDelegate(ByVal progressEvent As ProgressEvent, ByVal state As ProgressInformation)
 
<DllImport(LIBRARY, EntryPoint:="SetProgressEvent ", CallingConvention:=CallingConvention.StdCall)> _
Friend Shared Sub SetProgressHandler(ByVal notifyHandler As ProgressDelegate)
    ' Empty method body
End Sub
 
 

I use the imported method as follows...

 
Private Sub UpdateProgress(ByVal progressEvent As ProgressEvent, ByVal state As ProgressInformation)
    Console.WriteLine(progressEvent.ToString())
    Console.WriteLine("Size:{0}, Start:{1}, Reserved1:{2}, Reserved2:{3}", state.Size, state.Start, state.Reserved1, state.Reserved2)
End Sub
 
...
Public Sub New()
.... other initialisation code here
 
    SetProgressHandler(AddressOf UpdateProgress)
 
.... other dispose code here
End Sub
 

Now, the first time the UpdateProgress method runs i get valid data in the structure. As soon as the method returns, i get an AccessViolationException saying that the memory is corrupt. I'm thinking its something related to the way i've declared the import but i'm struggling to understand what.

Once again, thanks for any help in advance

Kev

[kevinwebster83]

And the answer is.... CDECL not STDCALL