Call Library Function Node Question

[ArthurB]

I'm farily new to LabVIEW so please be patient with me. I've written a dll file which I can access via the Call Library Function Node. My question is, how do I keep the DLL in memory until a certain event, like when the user presses on a button on the VI? From what I've read in this forum, the DLL is loaded in memory whenever the Call Library Function Node is loaded in memory. I need to have the DLL in memory longer than that. How would I do that?

One more question, how would I call a function in the DLL if it does not have any input our output parameters. For those wonder why you would have a function with no input or output parameters, well the function performs some initialization routine.

Any help would be appreciated.

Thanks.

[AESulzer]

Arthur,

The answer to your DLL loading question can be found in this Knowledge Base on our website. In short, a DLL is loaded/unloaded into memory along with its calling VI, so you shouldn't have to worry about any loading issues there. As for calling a function from a DLL without any input/output parameters, you simply just don't configure any. The function prototype in the configuration window should be void FunctionName(void). Best of luck in your programming!

Regards,