/// <summary>
/// Returns the given command and value as a formatted switch for use with the GhostScript API
/// </summary>
/// <param name="command"> The command. </param>
/// <param name="value"> The value. </param>
/// <returns>
/// The format switch.
/// </returns>
public static string GetFormattedArgument(GhostScriptCommand command, object value)
{
string commandName;
string operatorChar;
string commandValue;
// reformat some values depending on their type
if (value != null)
{
if (value is Enum)
{
value = (int)value;
}
else if (value is bool)
{
value = (bool)value ? "true" : "false";
}
}
// and work out how the names/values will be combined
commandName = GhostScriptAPI.GetCommandName(command);
operatorChar = value == null || string.IsNullOrEmpty(commandName) || command == GhostScriptCommand.Resolution ? string.Empty : "=";
commandValue = value == null ? string.Empty : value.ToString();
return(commandName + operatorChar + commandValue);
}
public void ConvertPdfPageToImage(string outputFileName, int pageNumber)
{
if (pageNumber < 1 || pageNumber > this.PageCount)
{
throw new ArgumentException("Page number is out of bounds", "pageNumber");
}
using (GhostScriptAPI api = new GhostScriptAPI())
api.Execute(this.GetConversionArguments(this._pdfFileName, outputFileName, pageNumber, this.PdfPassword, this.Settings));
}
/// <summary>
/// Returns the given argument dictionary as an array of formatted switches for use with the GhostScript API
/// </summary>
/// <param name="args"> The arguments. </param>
/// <returns>
/// The formatted arguments.
/// </returns>
public static string[] GetFormattedArguments(IDictionary <GhostScriptCommand, object> args)
{
List <string> translatedArgs;
translatedArgs = new List <string>();
foreach (KeyValuePair <GhostScriptCommand, object> pair in args)
{
translatedArgs.Add(GhostScriptAPI.GetFormattedArgument(pair.Key, pair.Value));
}
return(translatedArgs.ToArray());
}
/// <summary>
/// Calls the gsapi_init_with_args GhostScript API with the given arguments.
/// </summary>
/// <exception cref="GhostScriptException"> Thrown when ghostscript. </exception>
/// <param name="args"> The arguments. </param>
/// <returns>
/// The GhostScript result code
/// </returns>
public int Execute(IDictionary <GhostScriptCommand, object> args)
{
return(this.Execute(GhostScriptAPI.GetFormattedArguments(args)));
}
protected virtual IDictionary <GhostScriptCommand, object> GetConversionArguments(string pdfFileName, string outputImageFileName, int pageNumber, string password, Pdf2ImageSettings settings)
{
Dictionary <GhostScriptCommand, object> arguments;
arguments = new Dictionary <GhostScriptCommand, object>();
// basic GhostScript setup
arguments.Add(GhostScriptCommand.Silent, null);
arguments.Add(GhostScriptCommand.Safer, null);
arguments.Add(GhostScriptCommand.Batch, null);
arguments.Add(GhostScriptCommand.NoPause, null);
// specify the output
arguments.Add(GhostScriptCommand.Device, GhostScriptAPI.GetDeviceName(settings.ImageFormat));
arguments.Add(GhostScriptCommand.OutputFile, outputImageFileName);
// page numbers
arguments.Add(GhostScriptCommand.FirstPage, pageNumber);
arguments.Add(GhostScriptCommand.LastPage, pageNumber);
// graphics options
//arguments.Add(GhostScriptCommand.UseCIEColor, null);
if (settings.AntiAliasMode != AntiAliasMode.None)
{
arguments.Add(GhostScriptCommand.TextAlphaBits, settings.AntiAliasMode);
arguments.Add(GhostScriptCommand.GraphicsAlphaBits, settings.AntiAliasMode);
}
arguments.Add(GhostScriptCommand.GridToFitTT, settings.GridFitMode);
// image size
if (settings.TrimMode != PdfTrimMode.PaperSize)
{
arguments.Add(GhostScriptCommand.Resolution, settings.Dpi.ToString());
}
switch (settings.TrimMode)
{
case PdfTrimMode.PaperSize:
if (settings.PaperSize != PaperSize.Default)
{
arguments.Add(GhostScriptCommand.FixedMedia, true);
arguments.Add(GhostScriptCommand.PaperSize, settings.PaperSize);
}
break;
case PdfTrimMode.TrimBox:
arguments.Add(GhostScriptCommand.UseTrimBox, true);
break;
case PdfTrimMode.CropBox:
arguments.Add(GhostScriptCommand.UseCropBox, true);
break;
}
// pdf password
if (!string.IsNullOrEmpty(password))
{
arguments.Add(GhostScriptCommand.PDFPassword, password);
}
// pdf filename
arguments.Add(GhostScriptCommand.InputFile, pdfFileName);
return(arguments);
}
