How to programatically convert pdf to png in vb.net? - asp.net

Question

Is there a library or code somewhere that does that?
Some questions suggest software like Convert a PDF to a Transparent PNG with GhostScript
I need something that's done by program. So my site, which is an asp site, should have a function
function PNGfromPDF (someFile as String) as PNGSomething
end function
Something like that.
Any open source solution for that?

Answer 1

Try:
PdfDocument inputDocument = PdfReader.Open(fileNames[i], PdfDocumentOpenMode.Import);
// for each page create a new PDF file and save it on the disk
for (int pageCount = 0; pageCount < inputDocument.PageCount; pageCount++)
{
fileNameWithoutExtension = Path.GetFileNameWithoutExtension(fileNames[i]);
fileName = string.Format("{0}\\Documents\\{1}", Session.CentralWorkingDirectory, String.Format("{0} ({1}-{2}).pdf", fileNameWithoutExtension, pageCount + 1, inputDocument.PageCount));
pdfFile = PDFFile.Open(fileName);
pdfFile.SerialNumber = Configurations.PDFVIEW_KEY;
// Get image file name
string imageFileName = string.Format("{0}.png", fileName.Remove(fileName.Length - 4));
// If thumbnail already exists delete it
if (File.Exists(imageFileName))
{
File.Delete(imageFileName);
}
// Convert page to PNG and save it.
//Bitmap pageImage = pdfFile.GetPageImage(0, 32);
Bitmap pageImage = pdfFile.GetPageImage(0, 92);
pageImage.Save(imageFileName, ImageFormat.Png);
// Cleanup resources
pageImage.Dispose();
pdfFile.Dispose();
}
Here I am using below namespace...
using PdfSharp.Drawing;
using O2S.Components.PDFRender4NET; // Thrid party components so you use PDF sharp with this componets
using System.Drawing.Imaging;