Making dll from VI containing labview global variable ?

[ishraq]

I've made dll from VI containing labview global variable.
But, when I write a c program calling a function from the dll, it returns just error.
The goal is to read a labview global variables from c program. What can i do for it ?

[becktho]

Hi

If you don't use the dll in your LV app, it will be difficult, because it will be in the adress-range of you c app. So any writing of values to the global variable in LV, won't affect the variable in the dll.

What you can do is some kind of client-server architecture. You need a third app, which just does the data exchange - so you should be able to write a value from LV and read it from c.

There already have been discussions about similar topics - just search the forum.

Thomas

[chrisger]

hi there

if you want to read and write a LV - Global from a C-App you could add two functions to your LV-Dll like

WriteGlobal(*Data) and ReadGlobal(*Data).

The access to the global is then done inside the dll-dataspace. see attachment.