Understand​ing the webcam.dll file

Question

Hi there everyone, I am trying to learn how to use call library in Labview and this would be my first time doing so.
I am looking at an example online for usb and webcam.
I found this example with 
WEBCAMGRAB.DLL
I looked into the blocked diagram and i see 3 inputs.
the reason i know this because the block diagram said so.
lets say that i don't have the blocked diagram and only the WEBCAMGRAB.DLL file. How would I know how to use the file in CALL LIBRARY node?
how do i know that int32 is driver, width, and height?
Message Edited by krispiekream on 03-12-2009 04:36 PM
Message Edited by krispiekream on 03-12-2009 04:38 PM
Message Edited by krispiekream on 03-12-2009 04:39 PM
Best regards,
Krispiekream
Solved!
Go to Solution.
Attachments:
untitled.PNG ‏36 KB
WebcamGrab.zip ‏15 KB

Answer 1

thank you
smercurio_fc and jmcbee for your help on this issue for me.
its always a challenge learning new things..
i did get a chance to read over the document you gave me and the example is really easy. 
what if i don't have the .h file?
do you have examples of using .DLL to hardware?
i got the example somewhere on this forum...its been 5 years since i took the last C programing class...
here is the DLL.H
#ifndef _DLL_H_
#define _DLL_H_
#define EXPORT __declspec (dllexport)
EXPORT long SetUp(long driver, long width, long height);
EXPORT long GetDigitizer(long DigitizerID, CHAR *str);
EXPORT void Grab(unsigned char *LVPict);
EXPORT void ShowDialog(long WhichDlg);
#endif
Message Edited by krispiekream on 03-13-2009 12:27 PM
Best regards,
Krispiekream
Attachments:
dll.c ‏6 KB
dll.h ‏1 KB
test.vi ‏34 KB