Executing LabVIEW VIs through C style function pointers via .NET

re: Executing LabVIEW VIs through C style function pointers via .NET

vn — Wed, 07 Jan 2009 12:58:54 GMT

i need to pass the below structure from labVIEW to C DLL Can you help me out in this....is there an option to pass without writting a wrapper?or could how could you pass these kinda structures in labVIEW.

typedef struct

{

unsigned long NumOfParams;

SCONFIG *ConfigPtr;

} SCONFIG_LIST

typedef struct

{

unsigned long Parameter;

unsigned long Value;

} SCONFIG

kindly help me

re: Executing LabVIEW VIs through C style function pointers via .NET

vn — Wed, 07 Jan 2009 12:47:36 GMT

i need to pass the below structure from labVIEW to C DLL Can any one help me out .....is thr an option to pass without writting a wrapper?PL do help .....

typedef struct

{

unsigned long NumOfParams;

SCONFIG *ConfigPtr;

} SCONFIG_LIST

typedef struct

{

unsigned long Parameter;

unsigned long Value;

} SCONFIG

pl do help me....

re: Executing LabVIEW VIs through C style function pointers via .NET

Martin Boecskoer — Thu, 21 Aug 2008 09:04:20 GMT

Hi,

i am trying to implement a hardware in labview for my master thesis (sports science). as i am no programmer i am having not enough knowledge to get the things working right.

the problem i have got is simmilar to the one you solved.

i need to suply a function with a pointer to a callback function defined as

typedef BOOL (_stdcall *CHANNEL_EVENT_FUNC)(UCHAR ucANTChannel, UCHAR ucEvent);

it is used in

_declspec(dllexport) void ANT_AssignChannelEventFunction(UCHAR ucANTChannel, // Initialize Channel pointers

CHANNEL_EVENT_FUNC pfChannelEvent,

UCHAR *pucRxBuffer);

used in the c file as following

__declspec (dllexport) void ANT_AssignChannelEventFunction(UCHAR ucLink, CHANNEL_EVENT_FUNC pfLinkEvent, UCHAR *pucRxBuffer)

{

sLink[ucLink].pfLinkEvent = pfLinkEvent;

sLink[ucLink].pucRxBuffer = pucRxBuffer;

}

if you could help me by solving the problem i would be very thankfull or if you could make things work. i would pay for it too.

thank you a lot

martin

(email martin.boecskoer(at)aon.at)

re: Executing LabVIEW VIs through C style function pointers via .NET

tomsun — Sat, 14 Jun 2008 12:43:08 GMT

I'm new in .net, I have the similar problem, I need your help.

The following is the prototype of the callback function:

VOID(_stdcall *VideoFilter)(VOID *pcontext, BYTE *pData,ULONG dataLength)

Can you give me the corresponding .NET code?

Thank you in advance.

re: Executing LabVIEW VIs through C style function pointers via .NET

Rexxar — Fri, 23 Mar 2007 17:29:23 GMT

Sorry for lose link.

http://forums.ni.com/ni/board/message?board.id=170&message.id=237441

re: Executing LabVIEW VIs through C style function pointers via .NET

Rexxar — Fri, 23 Mar 2007 17:28:30 GMT

Thanks very much for this link, but I have a question when the callback function is a VI code and the caller is a dll function. Could you please read this post and give me a reply to"paulbin@126.com"?

Thanks very much again.

re: Executing LabVIEW VIs through C style function pointers via .NET

silver — Sun, 11 Feb 2007 17:20:51 GMT

Hi Joe

I have the same problem that you had.

Can you tell me how can I update LabVIEW

re: Executing LabVIEW VIs through C style function pointers via .NET

George Puiklis — Thu, 01 Feb 2007 15:33:08 GMT

Hello Joe,

How did you update labview? I mean 8.2 is the latest version. I am getting the same error you did (for another vi though).

George

(mail: gpouikli at ee.duth.gr)

re: Executing LabVIEW VIs through C style function pointers via .NET

Joe Ziegler — Sun, 21 Jan 2007 07:53:38 GMT

Updated Labview and it worked flawless. This is awesome.

Thanks, Joe

re: Executing LabVIEW VIs through C style function pointers via .NET

Joe Ziegler — Fri, 19 Jan 2007 05:31:16 GMT

I am getting the error...

VI version is later than the current LabVIEW version. An error occurred loading VI 'CleanupCallback.vi'. LabVIEW load error code 9: VI version (8.2) is newer than the LabVIEW version (8.2b23).

Strange....its basically the same version. Just off by a little b23. You would think a newer version would be somewhat backwards compatable. Guess not. So, how can I find out what is in "get callback function pointer" and cleanup callback? Great article..can't wait to impliement it.

re: Executing LabVIEW VIs through C style function pointers via .NET

Damjan — Tue, 12 Dec 2006 08:46:14 GMT

Hello!

Your solution is usefull also to solve an old problem here in my lab. I'm new in C#. I have a problem with your sourcecode. My compiler (Borland Dev.Studio) can't load the:

using System.Collections.Generic;

Any ideas?

regards, Damjan

KRIZMANCIC at TASC dot INFM dot it