Debenu Quick PDF Library 9 Developer Guide

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strText = strText + QP.ExtractFilePageText(strInputFilePath, "", nPage, 0); } // Write all the data to a file s = oFSO.CreateTextFile("extracted_text.txt", 1); s.Writeline(strText); s.Close();
PDF Rendering Rendering a PDF so that it can be viewed on screen is quite a difficult process. To render a PDF page the following steps need to be taken: 1. Locate the page object in the PDF. 2. Extract the page's content streams (one or more strings). 3. Parse the content stream to get the page description commands - these are similar to PostScript language commands. 4. The content streams commands refer to one or more resources (fonts, images, etc.) - these resource objects are located in the PDF and images are decoded and fonts are processed to obtain the glyph outlines. Text is simply a collection of shapes just like other graphic content. 5. As the page content is followed there are operations that adjust the user matrix which change the position, scaling and rotation. 6. These commands / objects collectively describe the page in mathematical terms and are then converted into an appropriate output - either an image (using GDI+ in our case) or a different graphical language like EPS, EMF/WMF etc. 7. The image is then loaded into the PDF viewer. Luckily the only item from above that you have to worry about is loading the image into your application. Debenu Quick PDF Library provides a variety of different functions for rendering a page from a PDF as an image, some of which can be seen when viewing the PDF rendering tag in our knowledge base. Here is a simple example using the RenderDocumentToFile function. /* Render a PDF file */ // Load the sample file QP.LoadFromFile("sample.pdf", “”); // Calculate the number of pages iNumPages = QP.PageCount(); // Render each page of the document to a separate file. // To view the images open the output folder. QP.RenderDocumentToFile(72, 1, iNumPages, 0, "image.bmp");
Page 1 and 2: Debenu Quick PDF Library 9 Develope
Page 3 and 4: Features The Debenu Quick PDF Libra
Page 5 and 6: License terms The full end user lic
Page 7 and 8: The installation directory will con
Page 9 and 10: But to begin with, you don’t have
Page 11 and 12: Blank document automatically loaded
Page 13 and 14: Optional Content Groups, Layers and
Page 15 and 16: Tasks These are the most common tas
Page 17 and 18: QP.DrawLine(20, 150, 592, 150); QP.
Page 19: QP.AddImageFromFile("sample123.jpg"
Page 23 and 24: Standard PDF printing The standard
Page 25 and 26: QP.Encrypt("locked_down", "", 1, En
Page 27 and 28: A sample page range is "10,15,18-20
Page 29 and 30: QP.AddToFileList("FilesToMerge", "s
Page 31 and 32: New doc with extract pages auto-sel
Page 33 and 34: QP.SetNeedAppearances(1); QP.SetFor
Page 35 and 36: iDf2 = QP.NewFormField("Swdedish",
Page 37 and 38: Count the total number of form fiel
Page 39 and 40: SetOutlineJavaScript function. You
Page 41 and 42: PDF Links Links in PDF files are ac
Page 43 and 44: Adding a link to an embedded file i
Page 45 and 46: outlines and this is the terminolog
Page 47 and 48: Count the number of pages iFilePage
Page 49 and 50: QP.SelectFont(fontID2); QP.DrawText
Page 51 and 52: * Check PDF for font resources */ /
Page 53 and 54: QP.DrawTextBox(350, 150, 200, 200,
Page 55 and 56: } // Write all the data to a file s
Page 57 and 58: { MsgBox("No image is selected"); }
Page 59 and 60: PDF Color Debenu Quick PDF Library
Page 61 and 62: Add OCG 1 QP.NewContentStream(); QP
Page 63 and 64: Load PDF to process QP.LoadFromFile
Page 65 and 66: PDF Attachments PDF files can conta
Page 67 and 68: Use the GetBarcodeWidth, DrawBarcod
Page 69 and 70: many times as you require. QP.SetCu

Debenu Quick PDF Library 9 Developer Guide

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