C Declaration Conversion

[Scott Wolfington]

C Declaration
--------------
char* _stdcall GMW_NewRecID( char *pBuff, char *pUser );


VB Declaration
--------------
Public Declare Function GMW_NewRecID Lib "GM6S32.dll" (Byval szRecid As string, _
                                                       ByVal szUser As String) As string


PB Declaration
--------------
DECLARE FUNCTION GMW_NewRecID LIB "GM6S32.dll" (BYREF zRecId AS ASCIIZ, _
                                                BYREF zUser AS ASCIIZ) AS LONG

Hi All!

I'm trying to convert a C declaration to PB. I think I've got it right, but it doesn't appear to be working. Each time I call the following code, I get an error message that says "The procedure entry point GMW_NEWRECID could not be located in the dynamic link library GM6S32.dll."

LOCAL psNewRecId    AS STRING POINTER
LOCAL sRecordId     AS ASCIIZ * 30
    
psNewRecId = GMW_NewRecID(sRecordId, "SCOTT" & CHR$(0))
MSGBOX @psNewRecId

I know the function is there because when I use the VB declaration from a test VB app, the function works. Maybe I'm not declaring the function correctly? Any help would be appreciated.

Thanks,
Scott

------------------
Scott Wolfington
http://www.boogietools.com




[This message has been edited by Scott Wolfington (edited March 05, 2003).]

[Don Dickinson]

DECLARE FUNCTION GMW_NewRecID LIB "GM6S32.dll" alias "GMW_NewRecID" _
    (BYREF zRecId AS ASCIIZ, BYREF zUser AS ASCIIZ) AS LONG

don't forget the alias! if this doesn't work, then the capitalization in the alias is wrong.

--Don

------------------
Don Dickinson
Author of ddoc Print and Preview
A dll-based print-preview engine for windows

www.greatwebdivide.com

[Cecil L. Williams]

The "BYREF" is really not needed. This is the PB default.

Cheers,
Cecil

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[Scott Wolfington]

Thanks Don. I've tried the capitalization and alias already, but I'll try it again.

Scott


------------------
Scott Wolfington
http://www.boogietools.com


[This message has been edited by Scott Wolfington (edited March 05, 2003).]

[Scott Wolfington]

Ok, when I tried the capitalization before, I used it within the ALIAS. That was the problem. Here's my new declaration:

DECLARE FUNCTION GMW_NewRecID LIB "GM6S32.dll" ALIAS "GMW_NewRecID" (BYREF zRecId AS ASCIIZ, BYREF zUser AS ASCIIZ) AS LONG

Once I fixed that, I had some other fixing to do too. Here's my new code that calls it:

    LOCAL pNewRecId     AS ASCIIZ POINTER
    LOCAL sRecordId     AS ASCIIZ * 31
    

    pNewRecId = GMW_NewRecID(sRecordId, "SCOTT" & CHR$(0))
    MSGBOX @pNewRecId

I had to redefine pNewRecId to be an ASCIIZ POINTER instead of a STRING POINTER.

Thanks guys!

Scott

------------------
Scott Wolfington
http://www.boogietools.com


[This message has been edited by Scott Wolfington (edited March 05, 2003).]

[Tom Hanlin]

No need to add the CHR$(0), by the way-- variable-length strings
come with an automatic CHR$(0) terminator. It's a Windows thing.

------------------
Tom Hanlin
PowerBASIC Staff

[Scott Wolfington]

Thanks Tom. -Scott


------------------
Scott Wolfington
http://www.boogietools.com


[This message has been edited by Scott Wolfington (edited March 05, 2003).]

[Alun Davies]

Function Type

A very late note

however I ahve just used some of the stuff in this thread to help me and note that
GMW_NewRecID is of type string and it's return value ( as a string) is what you want.

I know there is a zredID in the parameters but that is an input variable.

DECLARE FUNCTION GMW_NewRecID LIB "GM6S32.dll" alias "GMW_NewRecID" _
(BYREF zRecId AS ASCIIZ, BYREF zUser AS ASCIIZ) AS string