Cvi user interface reference manual




















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C PDF: C. This C. Network Variable Library. The Network Variable. You also can use this library in your. Real-Time RT applications. This library supersedes the DataSocket Library and provides better performance and. TDM Streaming Library. This library uses the TDM Streaming file format. You can then use. This function should be inserted with the other event registration functions lines We now need to implement the code within the callback function that should execute when the custom UI message is received.

The prototype of this function is provided in the documentation for the registration function above. The completed callback function is written below. The comments provide more detail on each call. To handle additional custom messages, simply add an additional case in the callback function for each new UI Message ID. The modified TestExec. This content is not available in your preferred language. Environment shows products that are verified to work for the solution described in this article.

This solution might also apply to other similar products or applications. What are UI Messages? Possible applications of custom UI Message include: Passing information on the total number of units tested to the User interface once the test complete Passing specific numeric results from a test and append them to a graph on the UI.

Why Use UI Messages? UI messages are preferred for two reasons: Independence of UI and sequence files - A User interface should always run with any sequence file, and vice versa. With UI messages: the User interface can execute sequences that do not implement certain messages the handling code in the User Interface simply never executes Sequences that post custom messages can be executed in a UI that is not built to handle them the UI message is just ignored by the User Interface Maintainability - UI messages avoid dependence on Sequence File Properties or UI variables, meaning less to maintain for developers of both sequence files and user interfaces Default TestStand UI Messages The TestStand engine automatically posts TestStand UI Messages to the Operator Interface at various points of execution to announce that various events have occurred.

These messages are used in much the same way as default messages, but all functionality must be implemented by the developer: posting the message in the sequence file - the engine does not automatically post custom UI messages handling the message in the User Interface - the TestStand UI manager controls do not execute any code to handle custom messages by default. These processes are discussed in detail in the next sections. Uses the current thread and execution reference.

PostUIMessage method - Use this method when not posting the message from a sequence. Note that this method is called directly on the engine. Unlike the previous method, you must specify an execution and thread reference when calling this method These methods allow you to specify the message ID as well as the data associated with the message. However, we can configure the operator interface to run user defined code when a UI message is handled by adding an event callback for one of two Application Manager events: UImessage event - this event is fired whenever any UI message is handled by the Application manager.

The event callback specified will execute before any default UI message handling operations. The cancel output event argument can be set to True within the callback to override the default event operations UserMessage event - this event is fired only for custom UI messages those with message ID of 10, or greater.

To implement code to execute when a custom UI message is received, we first need to implement a callback VI for the UserMessage Event: Expand the Register event node to contain an additional event. You should see three additional inputs Wire the Application manager reference to the first new input. Also, advancements in the personal computer area have shifted data acquisition tothe personal computer, which offers greater flexibility, ease of use, and cost-effective analysis.

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