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a call to the TypeLibrary in the Global.asa file, the constants of the COM object can be accessed, and errors can be better reported by the ASP code. If your Web application relies on COM objects that have declared data types in type libraries, you can declare the type libraries in Global.asa.</p>
<h3>
Syntax
</h3>
<table class="ex" cellspacing="0" border="1" width="100%" cellpadding="3">
<tr valign="top">
<td>
<pre><!--METADATA TYPE="TypeLib"
file="filename"
uuid="typelibraryuuid"
version="versionnumber"
lcid="localeid"
--></pre>
</td>
</tr>
</table>
<br />
<table class="ex" cellspacing="0" border="1" width="100%" cellpadding="3">
<tr>
<th align="left" valign="top" width="20%">Parameter</th>
<th align="left" valign="top" width="80%">Description</th>
</tr>
<tr>
<td valign="top">file</td>
<td valign="top">Specifies an absolute path to a type library.
<p>Either the file parameter or the uuid parameter is required</p>
</td>
</tr>
<tr>
<td valign="top">uuid</td>
<td valign="top">Specifies a unique identifier for the type library.
<p>Either the file parameter or the uuid parameter is required</p>
</td>
</tr>
<tr>
<td valign="top">version</td>
<td valign="top">Optional. Used for selecting version. If the requested version is not found, then the most recent version is used</td>
</tr>
<tr>
<td valign="top">lcid</td>
<td valign="top">Optional. The locale identifier to be used for the type library</td>
</tr>
</table>
<h3>Error Values</h3>
<p>
The server can return one of the following error messages:</p>
<table class="ex" cellspacing="0" border="1" width="100%" cellpadding="3">
<tr>
<th align="left" valign="top" width="20%">Error Code</th>
<th align="left" valign="top" width="80%">Description</th>
</tr>
<tr>
<td valign="top">ASP 0222</td>
<td valign="top"> Invalid type library specification
</td>
</tr>
<tr>
<td valign="top">ASP 0223</td>
<td valign="top"> Type library not found
</td>
</tr>
<tr>
<td valign="top">ASP 0224</td>
<td valign="top"> Type library cannot be loaded</td>
</tr>
<tr>
<td valign="top">ASP 0225</td>
<td valign="top"> Type library cannot be wrapped</td>
</tr>
</table>
<p><b>Note:</b> METADATA tags can appear anywhere in the Global.asa
file (both inside and outside <script> tags). However, it is recommended that
METADATA tags appear near the top of the Global.asa file.
</p>
<hr />
<h2>Restrictions</h2>
<p>Restrictions on what you can include in the Global.asa file:
</p>
<ul>
<li> You can not display text that is written in the Global.asa file. This file
can't display information</li>
<li>You can only use Server and Application objects in the Application_OnStart and Application_OnEnd
subroutines. In the Session_OnEnd subroutine, you can use Server, Application, and Session
objects. In the Session_OnStart subroutine you can use any built-in object</li>
</ul>
<hr />
<h2>How to use the Subroutines</h2>
<p>Global.asa is often used to initialize variables. </p>
<p> The
example below shows how to detect the exact time a visitor first arrives on a Web site. The time is stored in a Session variable named
"started",
and the value of the "started" variable can be accessed from any ASP page in the
application:</p>
<table class="ex" cellspacing="0" border="1" width="100%" cellpadding="3">
<tr valign="top">
<td>
<pre><script language="vbscript" runat="server">
sub Session_OnStart
Session("started")=now()
end sub
</script></pre>
</td>
</tr>
</table>
<p>Global.asa can also be used to control page access.
</p>
<p>The example
below shows how to redirect every new visitor to another page, in this case to a
page called "newpage.asp":
</p>
<table class="ex" cellspacing="0" border="1" width="100%" cellpadding="3">
<tr valign="top">
<td>
<pre><script language="vbscript" runat="server">
sub Session_OnStart
Response.Redirect("newpage.asp")
end sub
</script></pre>
</td>
</tr>
</table>
<p>And you can include functions in the Global.asa file.
</p>
<p>In the example below
the Application_OnStart subroutine occurs when the Web server starts. Then
the Application_OnStart subroutine calls another subroutine named "getcustomers".
The "getcustomers" subroutine opens a database and retrieves a record set from
the "customers" table. The record set is assigned to an array, where it
can be accessed from any ASP page without querying the database:
</p>
<table class="ex" cellspacing="0" border="1" width="100%" cellpadding="3">
<tr valign="top">
<td>
<pre><script language="vbscript" runat="server"></pre>
<pre>sub Application_OnStart
getcustomers
end sub</pre>
<pre>sub getcustomers
set conn=Server.CreateObject("ADODB.Connection")
conn.Provider="Microsoft.Jet.OLEDB.4.0"
conn.Open "c:/webdata/northwind.mdb"
set rs=conn.execute("select name from customers")
Application("customers")=rs.GetRows
rs.Close
conn.Close
end sub</pre>
<pre></script></pre>
</td>
</tr>
</table>
<br />
<hr />
<h2>Global.asa Example
</h2>
<p>In this example we will create a Global.asa file that counts the number of
current visitors.
</p>
<ul>
<li>The Application_OnStart sets the Application variable "visitors" to 0 when
the server starts</li>
<li>The Session_OnStart subroutine adds one to the variable "visitors" every time a new visitor
arrives</li>
<li>The
Session_OnEnd subroutine subtracts one from "visitors" each time this subroutine is
triggered</li>
</ul>
<p>The Global.asa file:
</p>
<table class="ex" cellspacing="0" border="1" width="100%" cellpadding="3">
<tr valign="top">
<td>
<pre><script language="vbscript" runat="server"></pre>
<pre>Sub Application_OnStart
Application("visitors")=0
End Sub</pre>
<pre>Sub Session_OnStart
Application.Lock
Application("visitors")=Application("visitors")+1
Application.UnLock
End Sub</pre>
<pre>Sub Session_OnEnd
Application.Lock
Application("visitors")=Application("visitors")-1
Application.UnLock
End Sub</pre>
<pre></script></pre>
</td>
</tr>
</table>
<p>To display the number of current visitors in an ASP file:
</p>
<table class="ex" cellspacing="0" border="1" width="100%" cellpadding="3">
<tr valign="top">
<td>
<pre><html>
<head>
</head>
<body>
<p>
There are <%response.write(Application("visitors"))%>
online now!
</p>
</body>
</html></pre>
</td>
</tr>
</table>
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