I want to make Zoom in my viewer

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   I make a PdfViewer.I want make a zoom, with quickpdf method : "DARenderPageToDC" and i've to create two sidebar, (right and bottom) for sliding zoom windows on the work page. 
This is a code....but howto i release qp handler for new visualization? I use a workaround: i copy file. 

int Handle = qp.DAOpenFileReadOnly(nameapp, null);
int PageCount = qp.DAGetPageCount(Handle);
int PageRefNo = qp.DAFindPage(Handle, PageNo);
 int Zoom = zoom;
 double widhtDoc = qp.DAGetPageWidth(Handle, PageRefNo);
 double heightDoc = qp.DAGetPageHeight(Handle, PageRefNo);
 double pageWidth = widhtDoc / Zoom;
 double pageHeight = heightDoc / Zoom;
  int dpi = 100;
 Bitmap b = new Bitmap(Convert.ToInt32(pageWidth * dpi), Convert.ToInt32(pageHeight * dpi));
   using (Graphics g = Graphics.FromImage(b)) {
      IntPtr dc = g.GetHdc();
       qp.DARenderPageToDC(Handle, PageRefNo, dpi, (int)dc);
       g.ReleaseHdc(dc);
       GraphicsUnit gUnit = GraphicsUnit.Point;
        g.PageUnit = gUnit;
    }
 pcbx.Image = b;
 pcbx.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
  //I can't release handling image and i make a copy file
 if (File.Exists(appfile)) File.Delete(appfile);
   File.Copy(appfile2, appfile);
 pcbx.SizeMode = System.Windows.Forms.PictureBoxSizeMode.StretchImage;

Another question: 
SetTextExtractionWordGap not work!!!
infact i try more times for test this functionality but "ExtractFilePageText" return partial words, however i found another workaround....

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Giuseppe Members Profile Find Members Posts Beginner Joined: 19 Nov 10 Location: Italy Status: Offline Points: 10	Post Options Post Reply Quote Giuseppe Report Post Thanks(0) Quote Reply Topic: I want to make Zoom in my viewer Posted: 13 Dec 10 at 10:04AM
	I make a PdfViewer. I want make a zoom, with quickpdf method : "DARenderPageToDC" and i've to create two sidebar, (right and bottom) for sliding zoom windows on the work page. This is a code....but howto i release qp handler for new visualization? I use a workaround: i copy file. int Handle = qp.DAOpenFileReadOnly(nameapp, null); int PageCount = qp.DAGetPageCount(Handle); int PageRefNo = qp.DAFindPage(Handle, PageNo); int Zoom = zoom; double widhtDoc = qp.DAGetPageWidth(Handle, PageRefNo); double heightDoc = qp.DAGetPageHeight(Handle, PageRefNo); double pageWidth = widhtDoc / Zoom; double pageHeight = heightDoc / Zoom; int dpi = 100; Bitmap b = new Bitmap(Convert.ToInt32(pageWidth * dpi), Convert.ToInt32(pageHeight * dpi)); using (Graphics g = Graphics.FromImage(b)) { IntPtr dc = g.GetHdc(); qp.DARenderPageToDC(Handle, PageRefNo, dpi, (int)dc); g.ReleaseHdc(dc); GraphicsUnit gUnit = GraphicsUnit.Point; g.PageUnit = gUnit; } pcbx.Image = b; pcbx.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D; //I can't release handling image and i make a copy file if (File.Exists(appfile)) File.Delete(appfile); File.Copy(appfile2, appfile); pcbx.SizeMode = System.Windows.Forms.PictureBoxSizeMode.StretchImage; Another question: SetTextExtractionWordGap not work!!! infact i try more times for test this functionality but "ExtractFilePageText" return partial words, however i found another workaround....

AndrewC Members Profile Find Members Posts Moderator Group Joined: 08 Dec 10 Location: Geelong, Aust Status: Offline Points: 841	Post Options Post Reply Quote AndrewC Report Post Thanks(0) Quote Reply Posted: 21 Jan 11 at 1:54PM
	You need to call the QP.DACloseFile(Handle); function to release the qp file. Put this just after you have called DARenderPageToDC() somewhere. Also SetTextExtractionWordGap ? What is the problem with the ExtractFilePageText function. Do you have an example that you can upload. I have personally found that Option 3 works better than Option 4.