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Advanced PDF Viewer: Developer's Guide
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Advanced PDF Viewer consists from one file only: PDFViewer.dll.
This file must be located under "<windows>\system32" or any other directory
available for the running application. If you want to use Advanced PDF Viewer as COM object then
this file must be registered through regsvr32.exe before using.
Advanced PDF Viewer can be used via DLL API functions or as COM object, also it has TPDFViewer class for Delphi (see PDFViewer.pas).
To create the most simple application with using Advanced PDF Viwer you must call only three functions:
LoadFile , GetPageBmpSize and DrawPageToCanvas.
Also it's a good idea to call CheckAcrobatReader firstly to check if Acrobat Reader v9.0 or higher is installed and configured
as viewer for PDF files.
Delphi: Create new application, place TImage on the form, set its "Align" property to "AlClient" and create the following event handlers for OnShow and OnClose form events:
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...
uses "PDFViewer.pas"
...
var pdf:TPDFView;
procedure TForm1.FormShow(Sender: TObject);
var w, h:integer;
bmp:tbitmap;
begin
pdf:=TPDFView.Create(self); //create Advanced PDF Viewer object
if pdf.LoadFile('c:\Sample_PDF_File.pdf') >ERROR_OFFSET then //load pdf file
begin
Showmessage('Some error!');
exit;
end;
pdf.GetPageBmpSize(w, h); //get bitmap size of pdf page
bmp:=tbitmap.Create; //create temporary bitmap
bmp.Width:=w; //set its size enough to draw pdf page
bmp.Height:=h;
pdf.DrawPageToCanvas(bmp.Canvas.Handle, 0, 0); //draw pdf page to bitmap
Image1.Picture.Assign(bmp); //copy bitmap to TImage object
bmp.Free; //free temporary bitmap
end;
procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
begin
pdf.FreeAllResources; //do not forget to call this function before closing application!
end;
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C#: Create new Windows application, place on the form PictureBox component and increase its size as much as you can. Use
"Project / Add reference" command to add "Advanced PDF Viewer" COM object to the project.
Then create the following event handle for "Load" and "FormClosed" form events:
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namespace WindowsApplication1
{
public partial class Form1 : Form
{
public PDFViewer.COMPDFView pdf = new PDFViewer.COMPDFView(); //instance of Advanced PDF Viewer
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
if (pdf.LoadFile("c:\\Sample_PDF_File.pdf") != 0) //load pdf file
{
System.Windows.Forms.MessageBox.Show("Some error!");
return;
}
int w, h;
pdf.GetPageBmpSize(out w, out h); //get pdf page bitmap size
Graphics gr = pictureBox1.CreateGraphics(); //create graphic object
Image i = new Bitmap(w, h, gr); //create temporary bitmap
Graphics gr2 = Graphics.FromImage(i); //create another graphic object
IntPtr dc = gr2.GetHdc(); //get device context (DC) handle for graphic object
pdf.DrawPageToCanvas((int)dc, 0, 0); //draw page to graphic object gr2
gr2.ReleaseHdc(dc); //release device context handle
pictureBox1.Image = i; //copy image to pictureBox object
GC.Collect(); //release unecessary memory (you can remove this line)
}
private void Form1_FormClosed(object sender, FormClosedEventArgs e)
{
pdf.FreeAllResources(); //do not forget to call this function before closing application!
}
}
}
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You must call FreeAllResources function when Advanced PDF Viewer
library is not necessary anymore, this function will release all allocated memory and resources.
Advanced PDF Viewer package contains demo projects for various programming languages (C++, Delphi, VB.NET, C#), see "Samples" directory
for details.
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