C# Signature:

   [DllImport("gsdll32.dll", CharSet = CharSet.Ansi, CallingConvention = CallingConvention.StdCall)]
   private static extern int gsapi_new_instance(ref System.IntPtr pinstance, System.IntPtr handle);

VB Signature:

  <DllImport("gsdll32.dll", CharSet:= CharSet.Ansi, CallingConvention:= CallingConvention.StdCall)> _
   Private Shared Function gsapi_new_instance(ByRef pinstance As System.IntPtr, ByVal handle As System.IntPtr) As Integer
   End Function

User-Defined Types:

None.

Alternative Managed API:

Do you know one? Please contribute it!

Notes:

None.

Tips & Tricks:

When working with the gsapi.dll, start with the gsapi_revision function, get that working. Then get this api working next.

Sample Code:

   /* Keep this variable at a class scope. It will be used by almost all of the gsapi functions */
   System.IntPtr pinstance= IntPtr.Zero;

   private void button1_Click(object sender, EventArgs e)
   {
   /* Pass in the reference to pinstance, declared above. Assume "this" is a Windows Form, so it will have a Handle */

    int retVal = gsapi_new_instance(ref pinstance, this.Handle);
   }

Sample Code:

// c# console program to call Ghostscript

using System;

using System.Runtime.InteropServices;

namespace GPL

{

    public class Ghostscript
    {
    [StructLayout(LayoutKind.Sequential)]
    public struct GSVersion
    {
        public string product;
        public string copyright;
        public int revision;
        public int revisionDate;
    }

    [DllImport("gsdll32.dll", CharSet = CharSet.Ansi, CallingConvention = CallingConvention.StdCall)]
    private static extern int gsapi_revision(ref GSVersion version, int len);

    [DllImport("gsdll32.dll", CharSet = CharSet.Ansi, CallingConvention = CallingConvention.StdCall)]
    private static extern int gsapi_new_instance(ref System.IntPtr pinstance, System.IntPtr handle);

    [DllImport("gsdll32.dll", CharSet = CharSet.Ansi, CallingConvention = CallingConvention.StdCall)]
    private static extern int gsapi_init_with_args(IntPtr pInstance, int argc, [In, Out] string[] argv);

    [DllImport("gsdll32.dll", CharSet = CharSet.Ansi, CallingConvention = CallingConvention.StdCall)]
    private static extern int gsapi_exit(IntPtr instance);

    [DllImport("gsdll32.dll", CharSet = CharSet.Ansi, CallingConvention = CallingConvention.StdCall)]
    private static extern void gsapi_delete_instance(System.IntPtr pinstance);

    public static void getVersion(ref GSVersion version)
    {
        gsapi_revision(ref version, Marshal.SizeOf(version));
    }

    public static void run(string[] argv)
    {
        IntPtr inst = IntPtr.Zero;
        int code = gsapi_new_instance(ref inst, IntPtr.Zero);
        if (code != 0) return;
        code = gsapi_init_with_args(inst, argv.Length, argv);
        gsapi_exit(inst);
        gsapi_delete_instance(inst);
    }
    }
    class Program
    {
    static void Main(string[] args)
    {
        Ghostscript.GSVersion gsVer = new Ghostscript.GSVersion();
        Ghostscript.getVersion(ref gsVer);
        // execute this command, to convert pdf to tiff
        // "C:\Program Files (x86)\gs\gs9.00\bin\gswin32c" -q -sOutputFile=D:\temp\Planung.tif -dNOPAUSE -dBATCH -P- -dSAFER -sDEVICE#tiffpack  -r100 D:\temp\Planung.pdf
        string[] argv = { "flashReader", "-q", "-sOutputFile=C:\\temp\\Outfile.tif", "-dNOPAUSE", "-dBATCH", "-P-", "-dSAFER", "-sDEVICE=tiffpack", "-r100", "C:\\temp\\Infile.pdf" };
        Ghostscript.run(argv);
    }
    }

}

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