Error in current page handling of Ghostscript Processor

[msdobrescu]

Hi,

Running the following:
gswin64c -dNODISPLAY -q -sFile="test.PDF" pdf_info.ps

has the following output:

        test.PDF has 1 page.

Title: 120906_DACHSER_CMYK
Creator: Adobe Illustrator CS5
Producer: Adobe PDF library 9.90
CreationDate: D:20121017105900+02'00'
ModDate: D:20121017105900+02'00'

Page 1 MediaBox: [0.0 0.0 157.833 34.666] BleedBox: [0.0 0.0 157.833 34.666] TrimBox: [0.0 0.0 157.833 34.666] ArtBox: [2.76025 1.92285 155.824 31.4028]

No system fonts are needed.

The GhostScript processor throws an exception with the following stacktrace:

   at System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal)
   at System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info)
   at Ghostscript.NET.Processor.GhostscriptProcessor.ProcessOutputLine(String line) in R:\EDENRED\Ghostscript.NET\Ghostscript.NET-master\Ghostscript.NET\Processor\GhostscriptProcessor.cs:line 462
   at Ghostscript.NET.Processor.GhostscriptProcessor.OnStdIoOutput(String output) in R:\EDENRED\Ghostscript.NET\Ghostscript.NET-master\Ghostscript.NET\Processor\GhostscriptProcessor.cs:line 407
   at Ghostscript.NET.Processor.GhostscriptProcessorInternalStdIOHandler.StdOut(String output) in R:\EDENRED\Ghostscript.NET\Ghostscript.NET-master\Ghostscript.NET\Processor\GhostscriptProcessorInternalStdIOHandler.cs:line 51
   at Ghostscript.NET.GhostscriptStdIO.gs_std_out(IntPtr handle, IntPtr pointer, Int32 count) in R:\EDENRED\Ghostscript.NET\Ghostscript.NET-master\Ghostscript.NET\GhostscriptStdIO.cs:line 173

Code sample:

using (GhostscriptProcessor processor = new GhostscriptProcessor(gv, true))
            {
                List<string> switches = new List<string>();
                switches.Add("-q");
                switches.Add("-dNODISPLAY");
                switches.Add(@"-sFile=" + fileName);
                switches.Add("pdf_info.ps");

                // if you don't want to handle stdio, you can pass 'null' value as the last parameter
                StdIOHandler stdio = new StdIOHandler(_output, _error);
                processor.StartProcessing(switches.ToArray(), stdio);

                string output = _output.ToString();
            }

The stdio class used is this:

    public class StdIOHandler : GhostscriptStdIO
    {
        private StringBuilder _output = null;
        private StringBuilder _error = null;

        public StdIOHandler(StringBuilder output, StringBuilder error)
            : base(true, true, true)
        {
            _output = output;
            _error = error;
        }

        public override void StdIn(out string input, int count)
        {
            input = null;
        }

        public override void StdOut(string output)
        {
            if (_output != null)
            {
                _output.Append(output);
            }
        }

        public override void StdError(string error)
        {
            if (_error != null)
            {
                _error.Append(error);
            }
        }
    }

The exception is due to the current page parsing algorithm used here:

        private void ProcessOutputLine(string line)
        {
            if (line.StartsWith("Processing pages"))
            {
                string[] chunks = line.Split(EMPTY_SPACE_SPLIT);
                _totalPages = int.Parse(chunks[chunks.Length - 1].TrimEnd('.'));
            }
            else if (line.StartsWith("Page"))
            {
                string[] chunks = line.Split(EMPTY_SPACE_SPLIT);
                int currentPage = int.Parse(chunks[chunks.Length - 1]);

                this.OnProcessing(new GhostscriptProcessorProcessingEventArgs(currentPage, _totalPages));
            }
        }

for the line:

Page 1 MediaBox: [0.0 0.0 157.833 34.666] BleedBox: [0.0 0.0 157.833 34.666] TrimBox: [0.0 0.0 157.833 34.666] ArtBox: [2.76025

The next token after 'Page' should be checked in this case.

Regards,
Mike

[jhabjan]

Thanks. Fixed in version 1.2.1.