How could i hide the CMD window When use the Sys.OleObject("WScript.Shell").Exec(CommandLine)

Thanks for sharing. Is there a particular reason you want to minimize the cmd window, instead of just closing the window after the command is run? It would be nice to have some extra context as to what your end goal is.

Either way, here's an example using a file (in this case). Any shell commands longer than one line I usually thrown in a .bat or .ps1 file, but here's how to do it... 

1) Just create a .txt file with the following contents:

if not DEFINED IS_MINIMIZED set IS_MINIMIZED=1 && start "" /min "%~dpnx0" %* && exit
net stop service
exit

**NOTE: if you don't want cmd window to close, remove && exit from line 1 and exit from line 3

2) Save As stopNetService.bat and add the file to your TestComplete > Stores > Files collection.

3) Double click the batch file to run and test that it does what you want

4) In TestComplete, create a new function as follows:

function stopNetService() {
  // stop net service .bat
  var batch = Sys.OleObject("WScript.Shell");  
  var stopNetService = batch.Run(Project.Path + "\\Stores\\Files\\stopNetService.bat"); 
  Log.Checkpoint("| Net Service Stopped |");
  Sys.Refresh(); 
}

 5) Use this function stopNetService() throughout your test as you please.