Question

I have the ghostscript dll (gsdll32.dll) which I have wrapped into my c# application. I tried various way to convert postscript to jpeg but it’s not happening. The code is as follows:

            PDFPrinter.WGhostScript gs = new PDFPrinter.WGhostScript();
            gs.AddParam("-sDEVICE=jpeg");
            gs.AddParam("-dJPEGQ=100");
            gs.AddParam("-dNOPAUSE");
            gs.AddParam("-dBATCH");
            gs.AddParam("-dSAFER");
            gs.AddParam("-r300");
            string outfile = txtOutFolderLoc.Text + txtFileName.Text + ".jpg";
            gs.AddParam(@"-sOutputFile=" + outfile);
            gs.AddParam(psFilePath);
            gs.Execute();
            Application.Exit();

What might be the reasons?

1. I have the postscript location at hand in the string “psFilePath”.
2. “outfile” represents the location and file name of the output.

[I have used the same stuff and converted the postcript to PDF and PNG as following].

To PDF WORKED

            gs.AddParam("-dBATCH");
            gs.AddParam("-dNOPAUSE");
            gs.AddParam("-sDEVICE=pdfwrite");
            gs.AddParam("-sPAPERSIZE=a4");
            gs.AddParam("-sProcessColorModel=DeviceGray");
            gs.AddParam("-sPDFPassword=password");
            string outfile = txtOutFolderLoc.Text + txtFileName.Text + ".pdf";
            gs.AddParam(@"-sOutputFile=" + outfile);
            gs.AddParam(psFilePath);
            gs.Execute();
            Application.Exit();

TO PNG CODE:

            gs.AddParam("-dSAFER");
            gs.AddParam("-dBATCH");
            gs.AddParam("-dNOPAUSE");
            gs.AddParam("-sDEVICE=png16m");
            gs.AddParam("-dGraphicsAlphaBits=4");
            gs.AddParam(@"-sOutputFile=" + txtOutFolderLoc.Text + txtFileName.Text + "%i.png");
            gs.AddParam(psFilePath);
            gs.Execute();
            Application.Exit();

EDIT I
The postscript is being generated and the application continues till it exits. But no jpeg file is found.

The postscript is generated by a postscript printer provided with the ghostscript. Once this postscript is generated the control is transferred to the application that converts this PS.

Answer 1

I managed to get the output with the following arguments:

            PDFPrinter.WGhostScript gs = new PDFPrinter.WGhostScript();
            gs.AddParam("-q");
            gs.AddParam("-dNOPAUSE");
            gs.AddParam("-dBATCH");
            gs.AddParam("-sDEVICE=jpeg");
            gs.AddParam(@"-sOutputFile=<full oytput file path>%i.jpg");
            gs.AddParam(<psFilePath>);

I had to add in the “-q” to get it done.

‘-q to prevent Ghostscript from writing messages to standard output which become mixed with the intended output stream.‘