Conditional disable structure

[Mathan]

Here we go.........

[muks]

Thanx mathan.Tossed u a five

[Mathan]

Thanx dear muks,

You helped(starred) me in lot of cases especially today. It's my pleasure to help you all.

Thanks,

Mathan

[muks]

I always wire a true/false constant to a normal case structure for debugging sake. Is conditional disable structure any different?

[dan_u]

You're mixing up conditional disable structure and diagram disable structure.
AFAIK, the diagram disable structure and a case structure with a T/F constant is equivalent (in both cases, the code in the disabled case isn't compiled).
As mentioned in the earlier replies, conditional disable structures have a different purpose (e.g. run code depending on OS type).

Daniel

[yenknip]

In LV 8.0 and later, true/false structures which are wired with a constant are optimised to not compile code which can never execute. Related to this is if you inport a pre 7.1 vi into 8.0 or later, then constants will be replaced with hidden controls, so as not to break code. As I understand, a disable diagram structure also gets ignored by the compiler.

Look up conditional disable (or enable!) structures in the example finder. or browse to \Labview x.x\examples\general\disable structures\conditional disable stucture.

As has been mentioned above, they can be used to tell the precomp to ignore frames, depending on what parameters have been defined. You can use this for differentiating between development code/production code. or compiling for different operating systems. The former is used as a demonstration in the LV Intermediate training sessions.

[muks]

You are right dan_u and thanx yenknip for the explanation . Will go through the example and post again if i am stuck

[erchaj]

Does it possible to change the value of the conditional symbol from the block diagram? 

Thanks 

[yenknip]

No, it is not possible to change the symbol values from the block diagram, for the simple reason that they are not a compiled resource. It is a tool for controlling the LabVIEW precompiler, similar to the #pragma command in C.

As mentioned above it is useful for instructing the compiler what to include in a project build, for instance when porting the program to another operating system.

[erchaj]

Are you sure?

Because I can read the description of the project as you see in the picture I have attached.

Thanks