Module CVI written TestStand property, property value resets after the step execution.

Hello

I did a lot of research and find nothing relevant to the question that I have. I've created a DLL in CVI containing several functions I call TestStand. I also created a type of step customized for each function call. Every function in the DLL has a runtime version and a version edit-time. Time edition features each have a UI associated with them are called from teststand. Change these functions are placed in the custom under the heading "change" step step-type tab Before executing a sequence with these custom steps the edit-time user interface is launched to allow the user to input values that will be passed to the run function. originally, I tried to set up my functions as a 'post step' step in the step properties. However, the sequences would fail to run because the parameters of the step module was empty. Then, I selected CVI as the adapter in the step properties and specified a default module for each type. This filled the tab module settings step like I wanted. However, when I ran the sequence each function execution of measures was called twice, once for the stage of the post, and once for what was in the tab module I suppose. I then re-entered the types of step and deleted all the steps of the post office. I thought that all the problems have been resolved at this point, however, after doing some more extensive tests I always have a bug, I was unable to get rid of that.

The problem is that two of my step types have to write data to current TestStand to execution after they ask an external device for IT. I know that the query works because my log text that generates the DLL displays the correct values. However, the data are not get rewritten on TestStand correctly. In the enforcement functions after checking the valid data has been returned, I try to write to TestStand using: "TS_PropertySetValNumber (seqContextCVI, NULL,"ThisContext.Step.ParameterValue.NumericParameter", 0, (double) ushortint);" »

I checked that this call generates an error and also used the TS_PropertyExists method to check that I had the correct search string. These extract so I added then another command that reads the value written to TestStand two return immediately after to write it. I printed this in my log file and found that the value is written to the property of TS. So, the problem is that TestStand is defining the property to reset after the code module is running. How to prevent this?  

Thanks for all comments, let me know if anything specified needs.

Josh Meyer

Well, I came to the conclusion that my 'problem' is not really a problem. I had a bit of a basic misunderstanding of the works of TestStand (I don't actually use it, I am writing just a code which will bring an existing one of the tools of the features inside the TS).

in any case, what I learned is that these properties are retained (so you can set up a sequence, save it, re - open and be able to run it without any reconfiguration for example), when you write to a property when installing editting/sequence. The run time values are not preserved (if connected) because they are only required to carry out. For example, if a user calls one of these functions to extract value from a controller, they probably do so because they want to check the value, it's what they expect it to be. Rather than watching the value after execution (which is what I me assuming they would do), they would set up the step after step "read value" to test the value that it returned. This value is available in 'RunState.PreviousStep.valuename' in the downloaded step step "read value".

Hope that I did not confuse anyone a lot, I'm completely new to TestStand.

Tags: NI Software

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