BrowserUk,
The code looks something like this: 
for my $pdf (glob('*.pdf')) {
    my $txt = convert_pdf_to_text($pdf);
    next if ! interesting($txt);
    # ...
}

sub convert_pdf_to_text {
    my ($file) = @_;
    my $abs_file = rel2abs(catfile(curdir(), $file));

    ## Start Simpo PDF To Text 
    system(1, 'C:\Program Files\Simpo PDF to Text\PDF2Text.exe');

    # Locate the window
    my $wid = WaitWindow('Simpo PDF to Text', 5);
    die "Couldn't find 'Simpo PDF to Text' window" if ! defined $wid;

    ## Make sure it is on top
    SetForegroundWindow($wid);

    # Convert PDFs
    add_pdf($abs_file);
    convert();

    # Close the application
    SendKeys('%{F4}');

    my $txt_file = construct_txt_file($file);
    return '' if ! -r $txt_file;
    my $data = read_file($txt_file);
    unlink $txt_file or die $!;
    return $data;
}

[download]
As you can see, I use system(1, $app) to start the application and alt+f4 to close the application (before starting the new one). I have already worked around the problem by leaving the app open. Just not sure why this doesn't work as I would expect.

Cheers - L~R

In reply to Re^2: Win32 limit to number of calls to system()? by Limbic~Region
in thread Win32 limit to number of calls to system()? by Limbic~Region

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