[solved] TProcess: Parameters.Add leads to empty Commandline
lazarus / 31-LCL

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Ocye · 2014-05-12 15:59

Nothing happens when I use the following code. The legacy method works
well. Did I miss something?

Code: [Select]  with TProcess.Create(nil) do
  try
//    CommandLine:='ffmpeg -r 2 -i /tmp/img%d.png -r 25 test.mpg';
//works
    Executable:='/usr/bin/ffmpeg'; //ffmpek > "executable not found"
    Parameters.Add('-r 2');
    Parameters.Add('-i '+GetTempDir+'img%d.png');
    Parameters.Add('-r 25');
    Parameters.Add('test.mpg');
    ShowMessage(CommandLine);  //empty
    Execute;
  finally
    Free; //TProcess
  end; //no output, no error

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taazz · 2014-05-12 16:53

well commandline is a one way road it gives params and executable to
TProcess but it does not reconstruct it self from the existing params
you would have known that if you simple took a fast look on the class
your self.

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Ocye · 2014-05-12 17:20

Thank you for reply. But actually my question is why Parameters.Add()
don't work. I have no clue what happens (nothing) and expected a
Commandline generated from Paramaters (of course, it's not
imperative). But there is nothing. So what's wrong with the code
snippet?

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marcov · 2014-05-12 18:36

Quote from: Ocye on May 12, 2014, 05:59:58 pm
    Parameters.Add('-r 2');
    Parameters.Add('-i '+GetTempDir+'img%d.png');
    Parameters.Add('-r 25');

These are wrong, use one .add add for each item   add('-r')  and
add('2'); etc.

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Ocye · 2014-05-12 20:46

Quote from: marcov on May 12, 2014, 08:36:24 pmThese are wrong, use
one .add add for each item   add('-r')  and add('2'); etc.
I thought a parameter consists of switch plus value, but apparently
there is no whitespace allowed. Now it works. Thanks a lot!