TwinCAT - How to check contents of a directory from Beckhoff PLC - plc

Question

I am trying to perform file management within the PLC. Currently, NT_StartProcess works as follows, but I will not have any feedback after the process has been spawned. Is there a way to check the contents of a directory from the PLC? Is there any way to get feedback from NT_StartProcess?
// File Locations
sTargetFilePath := 'C:\LocalHistory\test.job';
sTargetDirectory := 'C:\\CustomerDir';
// Build Command String
sCommand := '/C '; // Special command indicating command string input
sCommand := CONCAT(sCommand, 'move '); // Add move command
sCommand := CONCAT(sCommand, sTargetFilePath); // Add target file
sCommand := CONCAT(sCommand, ' '); // Required space for command
sCommand := CONCAT(sCommand, sTargetDirectory); // Add target location
// Output -> ‘/C move C:\NET-DRIVE\NewOrders\Original.xml 'C:\NET-DRIVE\OldOrders’
Process(
NETID := '', // Local System
PATHSTR := 'C:\Windows\System32\cmd.exe', // Path to local cmd executable
COMNDLINE := sCommand, // Comnmand to be executed
ERR => bError, // Error Output
ERRID => iErrorId // Error Id Output
);
// Trigger Command
IF bTrigger THEN
bTrigger := FALSE;
Process(START:=TRUE);
Process(START:=FALSE);
END_IF

Answer 1

Yes, there is a way. What you are looking for are those two function blocks: FB_EnumFindFileList, FB_EnumFindFileEntry
As for feedback from NT_StartProcess, you can't get it directly. There are two workaround I've been using:
Write the results to a text file, and open this file using TwinCAT.
In your case it would be something like this:
‘/C move C:\NET-DRIVE\NewOrders\Original.xml 'C:\NET-DRIVE\OldOrders && echo DONE > out.txt || echo FAIL > out.txt’
Command after && will be executed only, if previous succeded. Command after || will be executed only if previous failed.
> operator writes output of previous command to a file
Example above should create a file out.txt and write DONE or FAIL inside. I don't have a PLC with TwinCAT with me at the moment, but it works in windows cmd.
Write a program (In C# for example) that does what needs to be done and then connects to TwinCAT via ADS to put the result in variables