Echo verbose from command prompt to Labview

[mam1nej]

Hello everyone,

I need some direction into getting progress verbose back from windows command prompt.

I need to run AVRdude through labview to perform firmware updates. AVRdude is an executable that communicates with the bootloader ont he chip to upload the binary file. the process could take a minute or two depending on the size of the hex file.

During that time, I would like to display some progress bar or some verbose dictating the progress.

I know how to run the executabel from labview but I only can get the result at the end of the upload process. which is different from when you run the process manually . If I run the same command manually , I can see the progress on the cmd window.

Here is a screenshot of the result, the code I used is attached.

and here is the result I get at the end of the process :

Thanks for your help and guidance.

[aputman · Accepted solution]

I doubt that is possible using the System Exec VI.  That VI is just like any other VI that you might write, in that the output is not available at the terminals until the VI finishes execution. 

If the code that you are calling from the command line was written by you, you could output the verbose data to a file and read it in thru Labview.

[billko]

How about not running system exec minimized?

[mam1nej]

Thanks for your suggestions. I redirected the stdErr to a logfile and iteratively read from the generated text file. That did it.

Thanks

[Sam_Sharp]

I know you already found a solution - but you can also use the .NET process library to interactively read from a command-line application.

I posted about it previously here: http://forums.ni.com/t5/LabVIEW/Real-time-Command-Line-Interface-System-Exec/m-p/3183320#M921212

[aputman]

In looking for a response for this thread, I was thinking there had to be a way to call a command prompt from .NET but I didn't really spend much time researching for a way to do it.  Nice job Sam.

[mam1nej]

Sounds really interesting. I remember doign this with C# and was easily able  to redirect asterr and atsout with .Net.

I will try this out.

Thanks