C Convertion

[Gustavo Asplanatti]

To be able to use a Data Translation acquisition board , I have had to create a DLL
from Visual C++, to which I can use from my PB application.
I need help for declaring a function that figures in the following way in the include
file of C:

#ifdef STRICT
typedef BOOL (CALLBACK *DABRDPROC) (PTSTR pszBrdName, PTSTR pszEntry, LPARAM lParam);
#else
typedef FARPROC DABRDPROC;
#endif

ECODE WINAPI olDaEnumBoards (DABRDPROC pfnDaBrdProc, LPARAM lParam);

Maybe something like that??

DECLARE FUNCTION olDaEnumBoards LIB "olDa32.dll" ALIAS "olDaEnumBoards" (BYVAL lpszName AS ANY, BYVAL LParam AS LONG) AS LONG

DABRDPROC is a callback procedure.
The callback function must take the following form:

BOOL __export CALLBACK DaBrdProc (LPSTR lpszBrdName, LPSTR
lpszDriverEntry, LPARAM lParam)

Name lpszName
Type LPSTR
Description The board name, passed as an ASCII string.
Range N/A

Name lpszDriverEntry
Type LPSTR
Description The driver name and parameters. (For example, "dt3831.drv 0x260
10 6a 7b" indicates that a DT3831 driver is installed at I/O port 260
(hex) with IRQ 10, DMA channel 6 for the ADC, and DMA channel 7
for the DAC.)
Range N/A

Name lParam
Type LPARAM
Description The value passed to olDaEnumBoards.
Range N/A

Well, any help would be appreciate, thank in advance...

------------------
Gustavo Asplanatti
[email protected]

[This message has been edited by Gustavo Asplanatti (edited March 22, 2006).]

[Gustavo Asplanatti]

Upss... Sorry for the Topic name... I have written it very hurried,
I don't know if it is possible to fix it...

Evidently my English is not very good...

------------------
Gustavo Asplanatti
[email protected]

[Stan Durham]

totally guessing here

looks like (BYVAL lpszName AS ANY, BYVAL LParam AS LONG) AS LONG
should be (BYVAL pfnDaBrdProc AS LONG, BYVAL LParam AS LONG) AS LONG

If I understand right, it’s up to you to write this function:
BOOL __export CALLBACK DaBrdProc (LPSTR lpszBrdName, LPSTR
lpszDriverEntry, LPARAM lParam)

You then pass a CODEPTR(DaBrdProc) with the right parameters to olDaEnumBoards


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

[Michael Mattias]

>byval lpszname as any,

"byval as any" does not make any sense

pb translation, usage

declare function oldaenumboards lib "olda32.dll" alias "oldaenumboards" _
    (byval cbaddr as dword, byval lparam as long) as long

function callbackfunction(szbrdname as asciiz, szentry as asciiz, byval lparam as long) as long

end function
...
  call oldaenumbrds (codeptr (callbackfunction), lparam) to ecode

although this was about (shudder) translating from one language to another, this might be helpful to understand enums to callback procs in general:

pb/win: write your own enum functions september 23, 2002