Having issues trying to load a PDF file in multi-threaded environment (v.14.5 and C#.NET 2.0)

Okay, so I'm simply trying to load PDF images into the viewer.  The PDF engine is installed:

_codecs.Options.Pdf.IsEngineInstalled == true

I have a dual-threaded application that uses RasterCodecs twice.  Once to load the PDF image into a hashtable, and another to laod the PDF image in case it has not yet been loaded into the hashtable.  It appears that the RasterCodecs path is only valid in one of two threads, depending on who uses the codec first.  How can I make sure that both threads have access to the RasterCodecs object???  Can I set the property for the engine in the codecs object after I declare it???  If that's the case, then I can simply point to the engine on both objects and it should solve my issue.  Here's the error:

{"Either the files required for initializing the PDF engine were not found or they were found but they are incorrect"}

Sorry for the updates, but I wanted to make sure everyone knows what I've narrowed the issue down to be.  Finally, I'm currently looking for a synchronization call for the codecs if anyone knows where I could find this.

Travis

Thanks for the suggestion, I will try it and get back to you.  FYI, yes I do have the PDF engine downloaded, but I'll check the regisitry settings. 

Again, it works for a single thread, but fails for multi-threading.

C:\Program Files\LEAD Technologies, Inc.\LEADTOOLS EVAL 14.5\REDIST\PDF\LIB;C:\Program Files\LEAD Technologies, Inc.\LEADTOOLS EVAL 14.5\REDIST\PDF\FONTS;C:\Program Files\LEAD Technologies, Inc.\LEADTOOLS EVAL 14.5\REDIST\PDF\RESOURCE

It all appears to be functioning normally.  Again, it's a problem with multiple threads, but works fine with single threads.

Okay here the code that matters...  On the btnFolder_Click event starts everything off.  BTW, I hate the text editor on these forums.

private void btnFolder_Click(object sender, EventArgs e)
{
   folderBrowserDialog.ShowDialog();
   Path = folderBrowserDialog.SelectedPath.ToString();
   this.lblFileLocation.Text = Path.ToString();
   if (Path == "") { return; }
   Files = Directory.GetFiles(Path);

   CacheImages();

   CurrentIndex = 0;
   btnBack.Enabled = false;

   LoadImage(Files[0].ToString());

}

private void LoadImage(string fileName)
{

   IRasterImage Image;
   int idx;
   int total;
   string LoadTime;
   bool IsHashed = false;
   RasterCodecs c = new RasterCodecs(); 

try
{

   if (imageHash.ContainsKey(fileName))
   {
      Image = ((IRasterImage)imageHash[fileName]);
      IsHashed = true;
   }
   else
   {
      Image = c.Load(fileName);
      //Image = codecs.Load(fileName);

      IsHashed = false;

   }

   if (Image != null)
   {
      Viewer.Image = Image;
   }

   }
   catch (Exception e)
   {
      MessageBox.Show(e.Message.ToString(), "Error Loading Image");
   }

}

}

private void CacheImages()
{
   //Create new thread that will load images into
   //a hash table for quick retreival.
   //LoadHash is the "entry point"

   entryPoint = new ThreadStart(LoadHash);
   th1 = new Thread(entryPoint);
   th1.IsBackground = true;
   th1.Name = "Image Caching Thread";
   th1.Start();
}

private void LoadHash()
{

   //Loads the images into a hashtable in the background.
   IRasterImage img;
   RasterCodecs c = new RasterCodecs();
   //RasterCodecs.CodecsPath = @"C:\Program Files\LEAD Technologies, Inc\LEADTOOLS EVAL 14.5\Bin\Dotnet\v20";

   foreach (string f in Files)
   {
      img = c.Load(f.ToString());
      imageHash.Add(f.ToString(), img);
   }

   return;
}

private void frmViewer_Load(object sender, EventArgs e)
{
   RasterCodecs.CodecsPath = @"C:\Program Files\LEAD Technologies, Inc\LEADTOOLS EVAL 14.5\Bin\Dotnet\v20";
}

So are you telling me that when I call .Load from the RasterCodecs class it isn't thread safe if the file I'm loading is a PDF?  (I'm running version 14.0 and using the .NET libraries).

 Maen Hasan wrote:Hello,

I investigated more about this issue.

LEADTOOLS uses a third-party engine called GhostScript to support loading PDF file format. This third party is not thread safe. You will need to make sure that only one thread at a time calls load when loading PDF.

Thanks
Maen Badwan
LEADTOOLS Technical Support