CNVCreate Reader: Service search failed for the server. errno:-6338

Hey guys.  I'm talking about a LabVIEW application with my CVI application using shared variables, but I'm running into some issues that I can't solve.  The first question has to do with this error to the subjectl line.  I get this only after two calls to CNVCreateReader.  I don't know if there is anything wrong with my formatting of the call, but I suspect it has to do with something that I do not forget to do before you create more than one drive.  There are a total of about seven shared variables are Insider/instantiated by the LabVIEW program.  I'll call programmatically the LabVIEW program before you run code that communicates with the shared variables (LaunchExecutableEx).  My second question has to do with the writing of these same shared variables.  I can read a single very well and the data corresponding with the frontage of the LabVIEW application.  However, when I try to make a call to CNVWrite, I get an error of access denied (cannot write) style.  I suspect that the LabVIEW programmer must do something for the shared variables to allow me to write them, but I wanted to just help you guys ' first entry.  I'm in LabWindows/CVI v.9.0.1 and LabVIEW executable was built in LabVIEW 2009 so I also installed the runtime library 2009 LV.

Thank you.

Waiting gives time to other threads to execute their tasks, which suggests that the nets were this hungry. The connection used by CNVReader has more latency and overhead because it is synchronous and requires two-way communication. If you call CNVRead in a loop, then certainly you should also sleep/wait in the loop or you'll miss other threads. I recommend using instead of connections CNVCreateSubscriber or CNVCreateBufferedSubscriber - these are asynchronous connections and are much more effective and you won't wait.

The variable Manager shows the type that has been set up during the creation of the variable and not the type of the current value. It is possible that the variable has been initially configured as single-byte and not signed - you can always write byte unsigned to a configured as single variable value. I also seen cases where the variable Manager obtains the type badly in some cases. Please also check the type in the Distributed - System Manager it is a more recent program and replaces the Variable Manager. In addition, you should check how the program initially configured LabVIEW variable. The problem of this type should not be bound to the error you get when reading.

Tags: NI Software

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