using Ghostscript.NET;
using Ghostscript.NET.Rasterizer;
using SkiaSharp;

// Prefers Ghostscript.NativeAssets (if referenced), then a system install
var version = GhostscriptVersionInfo.GetPreferredVersion();

using var rasterizer = new GhostscriptRasterizer();
rasterizer.Open("input.pdf", version, false);

for (int page = 1; page <= rasterizer.PageCount; page++)
{
    SKBitmap image = rasterizer.GetPage(dpi: 150, pageNumber: page);
    using var stream = File.OpenWrite($"page_{page:D3}.png");
    image.Encode(stream, SKEncodedImageFormat.Png, 100);
}

using Ghostscript.NET.Processor;

using var processor = new GhostscriptProcessor();
processor.Process(new[]
{
    "-dBATCH", "-dNOPAUSE", "-dNOSAFER",
    "-sDEVICE=pdfwrite",
    "-sOutputFile=output.pdf",
    "input.pdf"
});

using Ghostscript.NET;
using Ghostscript.NET.Rasterizer;

var version = GhostscriptVersionInfo.GetLastInstalledVersion();

using var rasterizer = new GhostscriptRasterizer();
rasterizer.Open("input.pdf", version, false);

// Page numbers are 1-based
SKBitmap bitmap = rasterizer.GetPage(dpi: 300, pageNumber: 1);

using Ghostscript.NET;
using Ghostscript.NET.Rasterizer;

var version = GhostscriptVersionInfo.GetLastInstalledVersion();

using var rasterizer = new GhostscriptRasterizer();
rasterizer.GraphicsAlphaBits = 4;   // 1, 2, or 4
rasterizer.TextAlphaBits = 4;
rasterizer.CustomSwitches.Add("-dUseCropBox");

rasterizer.Open("input.pdf", version, false);

for (int i = 1; i <= rasterizer.PageCount; i++)
{
    SKBitmap page = rasterizer.GetPage(dpi: 150, pageNumber: i);
    // use page...
}

using Ghostscript.NET;
using Ghostscript.NET.Rasterizer;

var version = GhostscriptVersionInfo.GetLastInstalledVersion();

using var stream = File.OpenRead("input.pdf");
using var rasterizer = new GhostscriptRasterizer();
rasterizer.Open(stream, version, false);

SKBitmap bitmap = rasterizer.GetPage(dpi: 150, pageNumber: 1);

using Ghostscript.NET.OutputDevices;

var device = new GhostscriptPngDevice(GhostscriptPngDeviceType.Png16m);
device.GraphicsAlphaBits = GhostscriptImageDeviceAlphaBits.V_4;
device.TextAlphaBits    = GhostscriptImageDeviceAlphaBits.V_4;
device.ResolutionXY     = new GhostscriptImageDeviceResolution(300, 300);
device.InputFiles.Add("input.pdf");
device.Pdf.FirstPage    = 1;
device.Pdf.LastPage     = 5;
device.OutputPath       = @"output\page_%03d.png";
device.Process();

using Ghostscript.NET.OutputDevices;

var device = new GhostscriptJpegDevice(GhostscriptJpegDeviceType.Jpeg);
device.GraphicsAlphaBits = GhostscriptImageDeviceAlphaBits.V_4;
device.TextAlphaBits    = GhostscriptImageDeviceAlphaBits.V_4;
device.ResolutionXY     = new GhostscriptImageDeviceResolution(150, 150);
device.JpegQuality      = 85;
device.InputFiles.Add("input.pdf");
device.OutputPath       = @"output\page_%03d.jpg";
device.Process();

using Ghostscript.NET;
using Ghostscript.NET.Processor;

public class MyStdIO : GhostscriptStdIO
{
    public override void StdIn(out string input, int count) => input = string.Empty;
    public override void StdOut(string output) => Console.Write(output);
    public override void StdError(string error) => Console.Error.Write(error);
}

using var processor = new GhostscriptProcessor();
processor.Processing += (sender, e) =>
    Console.WriteLine($"Processing page {e.CurrentPage} of {e.TotalPages}");
processor.Error += (sender, e) =>
    Console.Error.WriteLine($"Error: {e.Message}");

processor.Process(new[]
{
    "-dBATCH", "-dNOPAUSE",
    "-sDEVICE=pdfwrite",
    "-dPDFSETTINGS=/ebook",       // compress for screen/ebook
    "-sOutputFile=compressed.pdf",
    "input.pdf"
}, new MyStdIO());

using Ghostscript.NET;
using Ghostscript.NET.Rasterizer;

// Point directly to a specific DLL — useful when Ghostscript is not installed system-wide
var version = new GhostscriptVersionInfo(@"C:\gs\gs9.56.1\bin\gsdll64.dll");

using var rasterizer = new GhostscriptRasterizer();
rasterizer.Open("input.pdf", version, false);

using Ghostscript.NET;
using Ghostscript.NET.Rasterizer;

// In-memory loading is supported on Windows only.
// On Linux/macOS, pass fromMemory: false (or omit it) so the library is loaded from disk.
byte[] dllBytes = File.ReadAllBytes(@"C:\gs\gs9.56.1\bin\gsdll64.dll");

using var rasterizer = new GhostscriptRasterizer();
rasterizer.Open("input.pdf", dllBytes);

// Explicit path
var version = new GhostscriptVersionInfo(@"C:\MyApp\gs\gsdll64.dll");

// From embedded byte array (deploy DLL as an embedded resource)
byte[] dll = GetEmbeddedResource("gsdll64.dll");
rasterizer.Open("input.pdf", dll);

using Ghostscript.NET;

var converter = new PDFA3Converter(@"C:\gs\gs9.56.1\bin\gsdll64.dll");
converter.ConvertToPDFA3("invoice.pdf", "invoice-pdfa3.pdf");

using Ghostscript.NET;

var converter = new PDFA3Converter(@"C:\gs\gs9.56.1\bin\gsdll64.dll");
converter.SetZUGFeRDProfile(ZUGFeRDProfile.Comfort);
converter.SetZUGFeRDVersion("2.3");
converter.SetEmbeddedXMLFile("factur-x.xml");
converter.ConvertToPDFA3("invoice.pdf", "invoice-pdfa3-zugferd.pdf");