How I can saving visa resource name in windows registery and load it again?

[javadi_ali]

I use visa functions in my program for serial communication , I want to save selected resource name in windows registery and next time that i run my program, i want to read it from registery and assign it to my visa resource name control.

example:         My visa resource name control value = COM2

                        I close my program with this value (how i can easily save COM2 to windows registry key ?)

                        I open my program again (how i can load COM2 in my resource name control from registry Key?)

                        How i can access to visa resource name list? example: COM1     COM2      LPT1     COM56     COM255

Thanks.

[mikeporter]

Do search in the LV examples for Registry. You will find examples for reading and writing registry values.

Mike...

[javadi_ali]

Hi;

I am professional in using registry but my problem is loading visa resource name in intialing step of my program.

how i can initial visa resource name with my value ? example : my computer has this serial ports: COM1 COM3 COM6

how i can initial my resource name control with COM6 or COM3 or COM1 ?

[Gabi1]

Hi,

Mike is right.

but could it be that your problem is different?

why not simply define the com port using "make current values default"?

or keep track of default values in a file that you would open at begining of your program?

[mikeporter]

I guess I don't understand your problem. All you have to do is ready the key containing the desired resource name and wire the resulting value to the appropriate terminal on the open VI. That's as hard as it gets...

Mike...

[javadi_ali]

I create VISA resource name in front panel:

Controls ---> Modern ---> I/O ---> VISA resource name

I click in right arrow in created control and i can view list of resource names.

example:  items of my visa resource names:

                   COM1

                   COM2

                   LPT1

How i can read this item list and for example place or save items on array?

Message Edited by javadi_ali on 06-11-2007 09:04 AM

[mikeporter]

Oh that... I don't think you can. That list is built dynamically from the resources that are available on that particular PC. What is it that you are trying to accomplish?

Mike...

[javadi_ali]

In some PCs such as Labtop when we use USB to RS232 converter to adding COM ports to PC. the number of port is undefined and it may be one of COM1 to COM256 and i must add all of COM1 to COM256 to my COM port list, but in visa resource name COM ports appear dinamically and don't need to list all 256 ports.

[mikeporter]

It doesn't matter what is in the list as long as the COM port that you pass to the control exists on the system that you are running the code on.

Mike...

[javadi_ali]

OK, thanks I know it , but I use two serial port and I must initial my two visa resource with different names, in addition in end of my program I want to save last value of two visa resource names and when i run my program again, I want to load these two visa resource names with saved values.