Our first application will create a one-page PDF document, set
its Title and Creator properties, and draw the phrase
"Hello, World!" in large Helvetica letters across the page.
| VBScript |
Set Pdf = Server.CreateObject("Persits.Pdf")
Set Doc = Pdf.CreateDocument
Doc.Title = "AspPDF Chapter 3 Hello World Sample"
Doc.Creator = "John Smith"
Set Page = Doc.Pages.Add
Set Font = Doc.Fonts("Helvetica")
Params = "x=0; y=650; width=612; alignment=center; size=50"
Page.Canvas.DrawText "Hello World!", Params, Font
Filename = Doc.Save( Server.MapPath("hello.pdf"), False )
Response.Write "Success! Download your PDF file <A HREF=" & Filename & ">here</A>"
|
| C# |
IPdfManager objPdf = new PdfManager();
IPdfDocument objDoc = objPdf.CreateDocument(Missing.Value);
objDoc.Title = "AspPDF Chapter 3 Hello World Sample";
objDoc.Creator = "John Smith";
IPdfPage objPage = objDoc.Pages.Add(Missing.Value, Missing.Value, Missing.Value);
IPdfFont objFont = objDoc.Fonts["Helvetica", Missing.Value];
String strParams = "x=0; y=650; width=612; alignment=center; size=50";
objPage.Canvas.DrawText( "Hello World!", strParams, objFont );
String strFilename = objDoc.Save( Server.MapPath("hello.pdf"), false );
lblResult.Text = "Success! Download your PDF file <A HREF=" + strFilename + ">here</A>";
|
The first line creates an instance of the PdfManager object,
AspPDF's top-level object. The following line creates an empty PdfDocument
object. The Pdf.CreateDocument method accepts a single optional argument,
a document ID string. If no ID is specified, AspPDF will generate
a random one automatically. The document ID argument is rarely used.
Doc.Title = "AspPDF Chapter 3 Hello World Sample"
Doc.Creator = "John Smith"
These two lines set the document's Title and Creator. These values can be viewed
in Acrobat Reader under File/Document Properties/Summary. Other document properties
that can be set via the PdfDocument object include Subject, Author, Keywords,
Producer, CreationDate and ModDate.
Set Page = Doc.Pages.Add
This line adds a new page to the document. The Pages.Add method accepts
three optional arguments: Width, Height (in PDF units, 1 unit equals 1/72 of an inch)
and InsertBefore which controls the location of the new page among existing page
(not applicable if the document is initially empty).
By default, the page width and height are 612 and 792, respectively,
which corresponds to the standard 8.5" x 11" size.
If InsertBefore is omitted, the new page is added to the end of the document.
If present, it must be a 1-based index of an existing page in the document.
Set Font = Doc.Fonts("Helvetica")
This line queries the Doc.Fonts collection for a desired font. The
default parameterized Fonts.Item property expects a font name
as the first parameter, and a CharSet code as the second optional parameter.
Font management is described in detail in Chapter 6.
Params = "x=0; y=650; width=612; alignment=center; size=50"
Page.Canvas.DrawText "Hello World!", Params, Font
These two lines display the text "Hello World!" in size 50 Helvetica on the page.
(The auxiliary string variable Params is used for readability purposes only.
The second argument to Canvas.DrawText could also be an
initialized PdfParam object.)
Besides the text and font arguments, five numeric arguments are being passed
to the DrawText method. X and Y are always required, the others are
optional in most cases. In this case, text alignment is set to center
which makes the Width parameter required as well.
Filename = Doc.Save( Server.MapPath("hello.pdf"), False )
This line saves the document to disk. The first argument is required and
must be set to a full file path. The second argument is optional. If set to
True or omitted, it instructs the Save method to overwrite an existing file.
If set to False, it forces unique file name generation. For example, if the file
hello.pdf already exists in the specified directory and another document
is being saved under the same name, the Save method tries the filenames
hello(1).pdf, hello(2).pdf, etc., until a non-existent name is found.
The Save method returns the filename (without the path) under which the file was
saved.
Click the links below to run this code sample:
http://localhost/asppdf/manual_03/03_hello.asp
http://localhost/asppdf/manual_03/03_hello.aspx
