Case Labels

It is highly advisable to use case labels over string constants to define the recipient case of a message.

A case label is simply a string constant that is wrapped in a VI, that is a member of a Worker and corresponds to the name of Worker's MHL case. A case label (right) is the preferred way to identify the recipient case of a message, instead of using a string constant (left) as shown in the image below.

String constant (left), Case Label (right) wired to Enqueue Standard Message.vi

Case labels provide the following advantages over using string constants to define the recipient case of a message.

1. You create them instantly via use of the quickdrop shortcut: Create Case Label (Ctrl+9).

2. They provide a single location to define the name of a Worker's MHL case.

3. You can search for every instance of a case label to find the locations in your code where a particular MHL case is sent messages from.

4. The quickdrop shortcut: Go To Case (Ctrl+8) allows you to jump directly to the corresponding MHL case of a selected case label, helping you to follow the data-flow of a message while developing.

5. Because a case label VI is a member of a Worker, the case label's VI icon take the Worker's class icon header, allowing you to identify which Worker the case label belongs to.

6. Create Case Label (Ctrl+9) also allows you to rename both the name of an MHL case and its corresponding case label.

Case labels are VIs with a c_ prefix in their filename, identifying them as a case label.