Information From Detached Process

[GTBuilder]

I'm using a DOS command file to execute a series of actions, including sending text to the DOS screen, etc.

Example of code:

void Clone::selectDriveP()
{
  if( driveOnoff)
  {
    twProcess.startDetached( "TW_install_P.bat");
    driveOnoff = false;
  }
}

void Clone::selectDriveP()
{
  if( driveOnoff)
  {
    twProcess.startDetached( "TW_install_P.bat");
    driveOnoff = false;
  }
}

To copy to clipboard, switch view to plain text mode 

I think I have to use startDetached in order to see the DOS screen. However, it seems that because I'm using startDetached, I cannot get signals from the detached process such as start(), finished( int , QProcess::ExitStatus), etc.

Is there something I'm missing?

[marcel]

When running batch files, you must use the command prompt:

%comspec% /k ""C:\path\to\your\batch\file.bat" x86

%comspec% /k ""C:\path\to\your\batch\file.bat" x86

To copy to clipboard, switch view to plain text mode 

Execute the batch file like that and there will be no need to use start detached.

[GTBuilder]

Not sure how this helps me. Issue isn't how to launch cmd.exe and the batch file.

How do I get signals back to the parent widget about what the batch file is doing? That's why I wanted to use QProcess.

[marcel]

You said that you can't see the command line window and that is why you resorted to startDetached.

In order to see the command window and NOT use startDetached, you must execute the batch file as I have shown you.

How do I get signals back to the parent widget about what the batch file is doing? That's why I wanted to use QProcess.

cmd will exit as soon as the batch finishes executing. Therefore start() and finish() will have the correct meaning.

[GTBuilder]

I modified the code as follows:

void Clone::selectDriveP()
{
  if( driveOnoff)
  {
    QStringList arg;
    arg << "/k" << "tw_install_p.bat";
    twProcess.start( "cmd.exe", arg);
    driveOnoff = false;
  }
}

void Clone::selectDriveP()
{
  if( driveOnoff)
  {
    QStringList arg;
    arg << "/k" << "tw_install_p.bat";
    twProcess.start( "cmd.exe", arg);
    driveOnoff = false;
  }
}

To copy to clipboard, switch view to plain text mode 

Note that cmd.exe and tw_install_p.bat are in the parent directory.

I get a started() signal but no finished() signal. I don't see a dos window and cmd.exe is not seen in Task Manager.

Clearly I'm doing something stupid here.

[codeslicer]

Thanks in my thread builder :P

Try looking at this thread:
http://www.qtcentre.org/forum/f-qt-p...ess-11463.html

[GTBuilder]

I've been assuming that the issue is with starting a command file. However, when I try to run a generic Windows program using the same QProcess and examining the errorString, I get "Unknown Error" even though the Windows program runs normally. Presumably this is why I get a started() signal but no finished() signal.

Any suggestions about where I should be looking?