Can LavVIEW call a dll and return a handle?

[Andrew Chang]

I wanted to design a LabVIEW in the way of dll calling. I used the
"Video for Windows" in Visual Studio 2003 .NET and created a dll file
with a function calling of capCreateCaptureWindow(). This function
returned a handle. But when I used the Call Library Function Node, I
found handle wasn't a supported type.

Are there any ways to return a handle to LabVIEW?

Thank you!

[Andrey_Dmitriev]

Hi, Andrew,

In your case you can use I32 type for output handle to the parent window.

best regards,

Andrey.

[Van_L]

Hi Andrew

Andrey is right.

For more information, please refer to this Help Document (Using External Code in LabVIEW)
Bottom of page 44/312 (pdf) talks about treating Handles as U32's

Hope this helps

[Andrew Chang]

On Mar 6, 4:10 pm, Andrey Dmitriev <x...@no.email> wrote:
> Hi, Andrew,
> &nbsp;
> In your case you can use I32 type for output handle to the parent window.
> &nbsp;
> best regards,
> Andrey.

Hi,
An I32 type is OK? I thought handle was a pointer therefore I should
try another way...
Thank you very much! I'll try right now.

best regards,
Andrew

[parthabe]

Will "Adapt to type" suffice or not?

[Andrey_Dmitriev]

No, it seems to be not pointer:

http://msdn2.microsoft.com/en-us/library/ms707166(VS.85).aspx

Return Values

Returns a handle of the capture window if successful or NULL otherwise.

But you can also prepare your own simple DLL-Wrapper if you have troubles with passing parameters from original functions to and from LabVIEW.

Andrey.