Batch file closing before completing all steps

Here's an answer from an archived script that can be helpful

https://community.smartbear.com/t5/TestComplete-Questions/How-do-i-run-a-Batch-file-from-testComplete/td-p/119065

from m_essaid 

I use cmd alot now, I create environments for my apps.

for example :

first, I kill all cmd processes

then :

TestedApps.Add('cmd.exe', 'mylocation\mybatchfile.bat', 1, true, '');

TestedApps.cmd.Run;

Then I wait till the end of the batch execution with this wait procedure

p := Sys.FindChild('ProcessName', 'cmd');
while p.Exists do
begin
IsClosed:= p.WaitProperty('Exists', False);
if not IsClosed then
Delay(3000, 'I wait for the end of the files copy');
p:= Sys.FindChild('ProcessName', 'cmd');
end;