I'm going to work on the assumption that you're actually setting the path controls to a value, and not leaving them blank. Do you not understand about how to use controls? If you don't make the value in a control to be the default value (right-click on the control and select
Data Operations -> Make Current Value Default) then the value will be set to whatever is passed in from the caller. If you leave the input to the VI disconnected, then the subVI will get an empty value for that input.
upon further inspection of the memory read vi in the memory read VI that is not connected to anything.
I have no idea what this means.
You need to isolate the problem, and determine what's going on. The "Screen Capture" is designed so that you can run it on its own, so you should first determine if this works on its own. So:
- Open it up, set the front panel controls to some values:
a) Set the "filename to read (on analyzer)" to some path, such as "C:\screencap.wmf".
b) Set the "filename to save (local) to some path on your local drive to where you want to save the file.
c) Set the "VISA Resource Name" control to select the VISA connection to your analyzer
- Run The "Screen Capture" VI by itself.
Does it work?
If it worked proceed as follows:
- Go back to your main VI.
- Set the values of the path controls that you created in the "Get Frequency" VI to be the same as the values you used when you ran the "Screen Capture" VI by itself.
- Run your main VI.
- What happens?
If the "Screen Capture" VI did not work, place a probe on the wire that's going from the "Memory Read" VI to the Write to Binary File function. Run the VI. Did you get data?
Did you change the VI I wrote to use constants? If you didn't then the Write To Binary File would display a dialog asking you where to save the file. But if you didn't wire a valid path then the memory read would not work properly since the filename isn't being passed in.