I want to make Zoom in my viewer

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Category: For Users of the Library
Forum Name: I need help - I can help
Forum Description: Problems and solutions while programming with the Debenu Quick PDF Library and Debenu PDF Viewer SDK
URL: http://www.quickpdf.org/forum/forum_posts.asp?TID=1673
Printed Date: 04 Apr 26 at 8:04PM
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Topic: I want to make Zoom in my viewer

Posted By: Giuseppe
Subject: I want to make Zoom in my viewer
Date 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....

Replies:

Posted By: AndrewC
Date 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.