Hello all,

I've been having some trouble with an api call.  I need to send in a long
value as a buffer.  

I've tried a few things.
1: just using an external address allocated to 4 bytes using an integer
address.

MyExtFunc >> withBuffer: aBuffer

<apicall: bool 'MyAPICall' (long) module: 'my.dll'>

------------------

MyExtFunc >> callWithBuffer

aBuffer := ExternalAddress allocate: 4.

self withBuffer: aBuffer getHandle asInteger.

-------------------

2: Using a pointer to ExternalAddress
MyExtFunc >> withBuffer: aBuffer

<apicall: bool 'MyAPICall' (ExternalAddress*) module: 'my.dll'>

--------------------

MyExtFunc >> callWithBuffer

aBuffer := ExternalAddress allocate: 4.

self withBuffer: aBuffer

-------------------
3: Creating external structure that holds a long 

MyExtFunc >> withBuffer: aBuffer

<apicall: bool 'MyAPICall' (Win32LongBuffer*) module: 'my.dll'>

-------------------

MyExtFunc >> callWithBuffer

aBuffer := Win32LongBuffer new buffer: 0; yourself
aBuffer setHandle: (ExternalAddress allocate: 4).

self withBuffer: aBuffer


-------------------
4: I tried the Win32LongBuffer as (long) with aBuffer getHandle asInteger
-------------------
5: I tried ExternalData using Cees method: 

argBuf _ ByteArray new: 4.
argBuf longAt: 1 put: 0 bigEndian: false.
argPtr _ ExternalData fromHandle: argBuf type: ExternalType long
asPointerType.

-------------------
6: extData := ExternalData fromHandle: (ptr := ExternalAddress allocate: 4)
type: ExternalType long [asPointerType]

Sending in the handle of the extData or the ptr and I tried both as integer.


So far nothing is working.  I believe that the problem is the buffer.  Does
anyone have any suggestions of other things I could try?

The Error I'm receiving is consistent: 
//
// MessageId: ERROR_ALREADY_EXISTS
//
// MessageText:
//
//  Cannot create a file when that file already exists.
//
#define ERROR_ALREADY_EXISTS             183L

I'm not sure what that means.  Googleing it didn't help much.

Does anyone have some suggestions on how to send in a long buffer for the
api to fill?

Any help would be greatly appreciated!

Thanks,

Ron Teitelbaum