Adobe Dreamweaver CC 2015 Manuel d'utilisateur télécharger pdf (Page 557)

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Dynamic sites, pages and web forms

Last updated 6/3/2015

Understanding physical and virtual paths

After using Dreamweaver to upload your files to a remote server, the files reside in a folder in the server’s local directory

tree. For example, on a server running Microsoft IIS, the path to your home page could be as follows:

c:\Inetpub\wwwroot\accounts\users\jsmith\index.htm

This path is known as the physical path to your file.

The URL to open your file, however, does not use the physical path. It uses the name of the server or domain followed

by a virtual path, as in the following example:

www.plutoserve.com/jsmith/index.htm

The virtual path, /jsmith/index.htm, stands in for the physical path,

c:\Inetpub\wwwroot\accounts\users\jsmith\index.htm.

Find a file’s physical path with the virtual path

If you work with an ISP, you don’t always know the physical path to the files you upload. ISPs typically provide you with

an FTP host, possibly a host directory, and a login name and password. ISPs also specify a URL to view your pages on

the Internet, such as www.plutoserve.com/jsmith/.

If you know the URL, then you can get the file’s virtual path—it’s the path that follows the server or domain name in a

URL. Once you know the virtual path, you can get the file’s physical path on the server using the MapPath method.

The MapPath method takes the virtual path as an argument and returns the file’s physical path and filename. Here’s the

method’s syntax:

Server.MapPath("/virtualpath")

If a file’s virtual path is /jsmith/index.htm, then the following expression returns its physical path:

Server.MapPath("/jsmith/index.htm")

You can experiment with the MapPath method as follows.

1 Open an ASP page in Dreamweaver and switch to Code view (View > Code).

2 Enter the following expression in the page’s HTML code.

<%Response.Write(stringvariable)%>

3 Use the MapPath method to obtain a value for the stringvariable argument.

Here’s an example:

<% Response.Write(Server.MapPath("/jsmith/index.htm")) %>

4 Switch to Live view (View > Live View) to view the page.

The page displays the physical path of the file on the application server, for example:

c:\Inetpub\wwwroot\accounts\users\jsmith\index.htm

For more information on the MapPath method, consult the online documentation that comes with Microsoft IIS.

Use a virtual path to connect to a database

To write a DSN-less connection string to a database file located on a remote server, you must know the physical path

to the file. The following example is a typical DSN-less connection string for a Microsoft Access database:

Driver={Microsoft Access Driver (*.mdb)};

DBQ=c:\Inetpub\wwwroot\accounts\users\jsmith\data\statistics.mdb

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Adobe Dreamweaver CC 2015 Manuel d'utilisateur Page 557

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