HELP--using a program's header file!

Ok, I have gone thru the jni tutorial and I understand the HelloWorld example... my problem is, in the tutorial the java part calls a C program that they then write... I need to call an existing program that is not written in java? I have this program's header file and that is all.
How do I use this so that my java program can call the existing non java program? What do I do with it, how should/do I make the dll? The methods sigs. in the non java program's header file do not look like the ones created by javah.exe.
please help, and thanks in advance

What you need to do is
1. Design nice java methods that are the equivalent of the C functions. Define them as "native" - no implementation in java.
2. run javah and generate an h file for those methods.
3. Write a dll in c for the new javah-generated .h file. This will be a very thin layer that translates between java and the original dll. In other words, your new dll mostly just calls the functions in the old dll.

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I would suggest, instead, to see if the program accepts command-line parameters. For example, does it accept a name of a file to open as part of launching it from the command line? If not, then you may need to resort to trying to control it via automation. If it has no built-in automation then you need to resort to using the OS to make pretend you're clicking buttons and typing text. This has come up many times before, and there have been numerous posts on this, so please do a search on controlling an external program from LabVIEW within this forum. You can call the Windows API functions to move the mouse to a specific location and click the button as well as typing text, or you can use third-part automation tools. One that I have used successfully is AutoIt. The search I indicated will yield other suggestions.

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kaycea114 wrote:
Hi,
Where do you think I should use the string?
The way that getOffset is currently defined in the DLL, I have to connect an integer input into the LabVIEW function. This prevents me from entering in: MEM_1 as the input to the LabVIEW function.
Are you suggesting that I change getOffset to receive a String parameter ("MEM_1")? Does that mean I need to do a string compare (line by line) through the header file to get the offset? It seems like doing this search through the header file would degrade performance, but if that's the only work around, then I'll do it.
Please advise.
Well, what you want to do is indeed entering a string and getting back the assigned integer. That is what the C preprocessor is doing too although there it is done only once at the preprocessor stage of course and not at runtime anymore. But LabVIEW is not a C preprocessor.
What you did so far seems to be to define getOffset() that accepts an enum that needs to be created from the C source code to then return the assigned constant. That's of course not very helpful.
And writing a VI that could parse the C header file and create a name/constant array is really a lot easier than doing the same in C. You don't even need to parse the file each time again, but can instead cache them in an uninitialized shift register (LV2 style global).
Even more easy would be to create from that data a ring control using property nodes and save it as custom control and voila you have the most direct lookup you can get in LabVIEW and it works just as comfortable as using the define in C code. It would mean that you need to seperate your header file possibly into several different files to only get related constants into the same ring control, but that is easily done.
Rolf Kalbermatter
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

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Proud to use LW/CVI from 3.1 on.
My contributions to the Developer Zone Community
If I have helped you, why not giving me a kudos?

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HELP--using a program's header file!

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