public static int GetPdfPageCount(string inputPdfFile)
{
PDFConvert converter = new PDFConvert();
converter.RedirectIO = true;
converter.ThrowOnlyException = true; // rethrow exceptions
//gs -q -sPDFname=test.pdf pdfpagecount.ps
List<string> gsArgs = new List<string>();
gsArgs.Add("-gs");
gsArgs.Add("-dNOPAUSE");
gsArgs.Add("-dQUIET");
gsArgs.Add("-dBATCH");
gsArgs.Add("-sPDFname=" + inputPdfFile);
gsArgs.Add("Library/pdfpagecount.ps");
int pageCount = 0;
using (StringWriter writer = new StringWriter())
{
try
{
converter.StdOut = writer;
if (converter.Initialize(gsArgs.ToArray()))
{
pageCount = Int32.Parse(writer.ToString().Replace("%%Pages: ", String.Empty));
}
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
}
return pageCount;
}
/// <summary>
/// Convert PDF to PNG format.
/// </summary>
/// <param name="inputPdfFile"></param>
/// <returns>an array of PNG images</returns>
public static string[] ConvertPdf2Png(string inputPdfFile)
{
PDFConvert converter = new PDFConvert();
converter.GraphicsAlphaBit = 4;
converter.TextAlphaBit = 4;
converter.ResolutionX = 300; // -r300
converter.OutputFormat = "pnggray"; // -sDEVICE
string sOutputFile = string.Format("{0}\\workingimage%03d.png", Path.GetDirectoryName(inputPdfFile));
bool success = converter.Convert(inputPdfFile, sOutputFile);
if (success)
{
// find working files
string[] workingFiles = Directory.GetFiles(Path.GetDirectoryName(inputPdfFile), "workingimage???.png");
return workingFiles;
}
else
{
return new string[0];
}
}
/// <summary>
/// Split PDF.
/// </summary>
/// <param name="inputPdfFile"></param>
/// <param name="outputPdfFile"></param>
/// <param name="firstPage"></param>
/// <param name="lastPage"></param>
public static void SplitPdf(string inputPdfFile, string outputPdfFile, string firstPage, string lastPage)
{
PDFConvert converter = new PDFConvert();
converter.OutputFormat = "pdfwrite"; // -sDEVICE
converter.ThrowOnlyException = true; // rethrow exceptions
//gs -sDEVICE=pdfwrite -dNOPAUSE -dQUIET -dBATCH -dFirstPage=m -dLastPage=n -sOutputFile=out.pdf in.pdf
if (firstPage.Trim().Length > 0)
{
converter.FirstPageToConvert = Int32.Parse(firstPage);
}
if (lastPage.Trim().Length > 0)
{
converter.LastPageToConvert = Int32.Parse(lastPage);
}
if (!converter.Convert(inputPdfFile, outputPdfFile))
{
throw new ApplicationException("Split PDF failed.");
}
}
/// <summary>
/// Merge PDF files.
/// </summary>
/// <param name="inputPdfFiles"></param>
/// <param name="outputPdfFile"></param>
public static void MergePdf(string[] inputPdfFiles, string outputPdfFile)
{
PDFConvert converter = new PDFConvert();
converter.ThrowOnlyException = true; // rethrow exceptions
//gs -sDEVICE=pdfwrite -dNOPAUSE -dQUIET -dBATCH -sOutputFile=out.pdf in1.pdf in2.pdf in3.pdf
List<string> gsArgs = new List<string>();
gsArgs.Add("-gs");
gsArgs.Add("-sDEVICE=pdfwrite");
gsArgs.Add("-dNOPAUSE");
gsArgs.Add("-dQUIET");
gsArgs.Add("-dBATCH");
gsArgs.Add("-sOutputFile=" + outputPdfFile);
foreach (string inputPdfFile in inputPdfFiles)
{
gsArgs.Add(inputPdfFile);
}
if (!converter.Initialize(gsArgs.ToArray()))
{
throw new ApplicationException("Merge PDF failed.");
}
}
