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PDF Viewer Control Without Acrobat Reader Installed. PDF document viewer control that does not require any Acrobat product to be installed. Introduction. This article discusses how to create a .
Building an ASP.NET PDF Viewer with Telerik Window Control and PDF.js. Daniel Peichev is Software Developer at one of Telerik's ASP.NET AJAX teams. How to add PDF Viewer control for Windows Forms to your C#.NET Applications.
NET PDF Viewer control that is not dependent on Acrobat software being installed. Fundamental Concepts. The basic steps that need to take place in order to view a PDF document: Get a page count of the PDF document that needs to be viewed to define your page number boundaries (i. Text. Sharp or PDFLib. NET) Convert the PDF document (specific page on demand) to a raster image format (Ghost.
Script API or PDFLib. NET) - -(Deprecated) Extract only the current frame to be viewed from the raster image (Free.
Image. Net) Convert the current frame to be viewed into a System. Image. Display the current frame in a Picture. Box control Several utility classes were created or added from others which expose functionality needed from the various helper libraries. Ghost. Script. Lib. PDF to TIFF for Viewing and Printing) AFPDFLib.
Util. vb (contains methods to convert PDF to System. Image for Viewing and Printing as well as methods to create a Bookmark Tree. View) i. Text. Sharp. Util. vb (contains methods for getting PDF page count, converting images to searchable PDF and for extracting PDF bookmarks into Tree.
Nodes) Printer. Util. Image. Util. vb (contains methods for image manipulation such as resize, rotation, conversion, etc.) Tesseract.
OCR. vb (contains methods for Optical Character Recognition from images) PDFViewer. Viewer user control) I was tempted to move every function over to PDFLib. Net (XPDF) which is faster, but after a lot of testing, I decided to use Ghostscript and PDFLib. NET. Ghostscript is used for printing, "PDF to image" conversion, and as a secondary renderer in case of XPDF incompatibility. PDFLib. NET is used for quick PDF to screen rendering, searching, and bookmarks.
Using the Code. This project consists of 7 DLLs that must all be in the same directory: Free. Image. dll. Free. Image. NET. dllgsdll. PDFLib. NET. dlltessnet. PDFView. dll. Due to file size restrictions, I could not include the Ghostscript 8. DLL (gsdll. 32. dll) in the source code.
Please download the Win. Ghostscript 8. 6. PDFView\lib directory where the other DLLs already exist.
To place a PDF control on form: Dim PDFFile. Name As. String = "My. PDF. pdf"Dim PDFViewer As. New PDFView. PDFViewer. PDFViewer. File. Name = Open. File. Dialog. 1. File. Name. PDFViewer. Dock = Dock.
Style. Fill Me. Controls. Add(PDFViewer)The essential part of this solution is extracting the current frame to be viewed from a multi- frame (or single frame) image. At first I used System.
Drawing to implement it. I found this to be slower than other C++ solutions that use DIBs (Device Independent Bitmaps) to perform graphic conversions. Public. Shared. Function Get.
Frame. From. Tiff_. By. Val Filename As. String, By. Val Frame. Number As. Integer) As Image. Dim fs As File. Stream = File. Open(Filename, File. Mode. Open, File.
Access. Read). Dim bm As System. Drawing. Bitmap = _. CType(System. Drawing. Bitmap. From. Stream(fs), System. Drawing. Bitmap). Select. Active. Frame(Frame. Dimension. Page, Frame.
Number). Dim temp As. New System. Drawing. Bitmap(bm. Width, bm.
Height). Dim g As Graphics = Graphics. From. Image(temp). Interpolation. Mode = Interpolation. Mode. Nearest. Neighbor. Draw. Image(bm, 0, 0, bm. Width, bm. Height).
Dispose(). Get. Frame. From. Tiff = temp. End. Function. I then tried implementing Free. Image with a . NET wrapper which gave it a little speed boost.
Free. Image also has a ton of image conversion functions which may come in handy if you wanted to extend this into an editor. Public. Shared. Function Get. Frame. From. Tiff.
By. Val Filename As. String, By. Val Frame.
Number As. Integer) As Image. Dim dib As FIMULTIBITMAP = New FIMULTIBITMAP(). Free. Image. Open. Multi. Bitmap. Ex(Filename).
Dim page As FIBITMAP = New FIBITMAP(). Free. Image. Lock. Page(dib, Frame. Number). Get. Frame. From.
Tiff. 2 = Free. Image. Get. Bitmap(page). Set. Null(). Free. Image. Close. Multi. Bitmap. Ex(dib). End. Function. I ended up implementing PDFLib. NET which gave it a substantial speed boost since the amount of File I/O operations were reduced.
Another streamlined routine for extracting one page from a PDF was added to the Ghostscript utility class as well. AFPDFLib. Util. vb. Public. Shared. Sub Draw. Image. From. PDF(By.
Ref pdf. Doc As AFPDFLib. NET. AFPDFDoc. By. Val Page. Number As. Integer, By. Ref o. Picture. Box As Picture. Box). If pdf. Doc Is.
Not. Nothing. Then. Doc. Current. Page = Page. Number. pdf. Doc. Current. X = 0. pdf. Doc. Current. Y = 0. Doc. Render. DPI = RENDER_DPI.
Doc. Render. Page(o. Picture. Box. Handle. To. Int. 32()). o. Picture. Box. Image = Render(pdf. Doc). End. If. End. Sub. Public. Shared. Function Render(By.
Ref pdf. Doc As AFPDFLib. NET. AFPDFDoc) As Bitmap. If pdf. Doc Is. Not. Nothing. Then. Dim backbuffer As.
New Bitmap(pdf. Doc. Page. Width, pdf. Doc. Page. Height).
Dim g As Graphics = Graphics. From. Image(backbuffer). Using g. Dim lhdc As. Integer = g. Get. Hdc(). To. Int. 32(). Doc. Render. HDC(lhdc). Release. Hdc(). End.
Using. g. Dispose(). Return backbuffer. End. If. Return. Nothing. End. Function. Ghost. Script. Lib. vb. Public. Shared. Function Get. Page. From. PDF(By.
Val filename As. String. By. Val Page. Number As.
Integer, Optional. By. Val To. Printer As.
Boolean = False) As Image. Dim converter As. New Convert. PDF.
PDFConvert. Dim Converted As. Boolean = False. converter.
Rendering. Threads = Environment. Processor. Count. Output. To. Multiple. File = False. If Page. Number > 0. Then.
First. Page. To. Convert = Page. Number. converter. Last. Page. To. Convert = Page. Number. Else. Get. Page. From. PDF = Nothing. Exit. Function. End.
If. converter. Fit. Page = False. converter. JPEGQuality = 7. 0If To. Printer = True. Then converter.
Text. Alpha. Bit = - 1. Graphics. Alpha. Bit = - 1. Resolution. X = PRINT_DPI. Resolution. Y = PRINT_DPI. Else converter. Text. Alpha. Bit = 4. Graphics. Alpha. Bit = 4.
Resolution. X = VIEW_DPI. Resolution. Y = VIEW_DPI.
End. If. converter. Output. Format = COLOR_PNG_RGB. Dim input As System. IO. File. Info = New File. Info(filename). Dim output As.
String = System. IO. Path. Get. Temp. Path & Now. Ticks & ". png". Converted = converter. Convert(input. Full.
Name, output). If Converted Then. Get. Page. From. PDF = New Bitmap(output). Image. Util. Delete.
File(output). Else. Get. Page. From. PDF = Nothing. End. If. End. Function. In the PDFViewer code, a page number is specified and: The page is loaded from the PDF file and converted to a System.
Image object. The Picture. Box is updated with the image. Private. Function Show. Image. From. File(By.
Val s. File. Name As. String. By. Val i. Frame. Number As. Integer, By. Ref o. Picture. Box As Picture. Box. Optional. By. Val XPDFDPI As. Integer = 0) As Image.
Picture. Box. Invalidate(). If m. Use. XPDF Then. If Image. Util. Is. PDF(s. File. Name) Then. If XPDFDPI > 0. Then. AFPDFLib. Util.
Draw. Image. From. PDF(m. PDFDoc, i. Frame. Number + 1. Picture. Box, XPDFDPI). Else. AFPDFLib. Util. Draw. Image. From. PDF(m. PDFDoc, i.
Frame. Number + 1, o. Picture. Box). End. If. End. If. Else.
If Image. Util. Is. PDF(s. File. Name) Then o. Picture. Box. Image = Convert. PDF. PDFConvert. Get. Page. From. PDF(s.
File. Name. i. Frame. Number + 1). Else.
If Image. Util. Is. Tiff(s. File. Name) Then.
Picture. Box. Image = Image. Util. Get. Frame. From. Tiff(s. File. Name, i. Frame. Number).
End. If. End. If. Picture. Box. Update(). Return o. Picture. Box. Image. End. Function. Points of Interest. This project was made possible due to various open source libraries that others were kind enough to distribute freely.
I would like to thank all of the Ghostscript, Free. Image. NET, i. Text.
Sharp, Tess. Net, and AFPDFLib (PDFLib. Net) developers for their efforts.
History. 19th June, 2. Initial release 2. June, 2. 00. 9: Updated source code to correctly scale printed pages to the Printable Page Area of the printer that is selected 7th July, 2. Updated source code to use AFPDFLib(XPDF) or Ghostscript for PDF rendering 1.
July, 2. 00. 9: Updated source code to use PDFLib. Net(XPDF ver 3. 0. July, 2. 00. 9: Added "Image to PDF" import, password prompt for encrypted PDF files, fallback rendering to Ghostscript if XPDF fails, latest version of PDFLib.
Net with various bug fixes applied, and LZW compression for "PDF to TIFF" export 2. August, 2. 00. 9: Major changes. Added the ability to convert images into a searchable PDF (OCR is English only for now) Added the ability to export a PDF to an HTML Image Viewer Pages are only rendered at the DPI needed to fill the Viewer window (good speed increase) Rotated page settings are kept while viewing the document Added the ability to convert images into an encrypted PDF Changed bookmark tree generation to use recursion Multiple bug fixes (see SVN log on the repository) 5th October, 2.
Fixed problem with incorrect configuration error with PDFLib. Net. dll. Removed dependencies on Free.