QuickPDF with TPL

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   Hello,
i'm trying to read a huge file with almost 12000 pages and i need to performe text search on it. i've tried reading page by page but it tooks about 15 minutes. I tried to use

Parallel.For(0,pageCount,(i)=>{ qp.SelectPage(i);
s = qp.GetPageText(3)});

public string GetPageText(int ExtractOptions)
{
   if (dll == null) return "";
   else
   {
         IntPtr data = dll.QuickPDFGetPageText(instanceID, ExtractOptions);
         int size = dll.QuickPDFStringResultLength(instanceID);
         byte[] result = new byte[size];
         Marshal.Copy(data, result, 0, size);
         return Encoding.UTF8.GetString(result);
   }
}

but i receive a Corrupted Memory Exception 
          IntPtr data = dll.QuickPDFGetPageText(instanceID, ExtractOptions);

Is QuickPDF tread safe?
Thanks!

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i.collodoro Members Profile Find Members Posts Beginner Joined: 20 Apr 11 Status: Offline Points: 2	Post Options Post Reply Quote i.collodoro Report Post Thanks(0) Quote Reply Topic: QuickPDF with TPL Posted: 20 Apr 11 at 4:11PM
	Hello, i'm trying to read a huge file with almost 12000 pages and i need to performe text search on it. i've tried reading page by page but it tooks about 15 minutes. I tried to use Parallel.For(0,pageCount,(i)=>{ qp.SelectPage(i); s = qp.GetPageText(3)}); public string GetPageText(int ExtractOptions) { if (dll == null) return ""; else { IntPtr data = dll.QuickPDFGetPageText(instanceID, ExtractOptions); int size = dll.QuickPDFStringResultLength(instanceID); byte[] result = new byte[size]; Marshal.Copy(data, result, 0, size); return Encoding.UTF8.GetString(result); } } but i receive a Corrupted Memory Exception IntPtr data = dll.QuickPDFGetPageText(instanceID, ExtractOptions); Is QuickPDF tread safe? Thanks!

Rowan Members Profile Find Members Posts Moderator Group Joined: 10 Jan 09 Status: Offline Points: 398	Post Options Post Reply Quote Rowan Report Post Thanks(0) Quote Reply Posted: 21 Apr 11 at 2:29PM
	Usually when the phrase "thread safe" is used it means that the same instance of the library can be accessed by different threads at the same time. This means that Quick PDF Library is not thread safe because a single instance of Quick PDF Library can only be accessed by the thread that created the instance. However, Quick PDF Library can be used in a multithreaded environment so long as a separate instance of the library is created by each thread. For users of the ActiveX edition of the library, please note that this version has been compiled with the threading mode set to "single threaded apartment".