This tutorial show you a simple example to explain how to invoke Win32 API in ASP.NET 2.0 and VB.NET.
To invoke Win32 API using ASP.NET 2.0 and C# 2.0 is actually very simple.
First, you will need to import the namespaces
Imports System.Net
Imports System.Text.RegularExpressions
Imports System.Text
Imports System.Runtime.InteropServices |
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Then, add two controls to web page, a Button and a Label control
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>A sample of invoking Win32 API in ASP.NET 2.0 VB</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<strong>Test Your Click Interval</strong><br />
<br />
<asp:Button ID="btnSubmit" runat="server" Text="Click Me!" /> <br />
<br />
<asp:Label ID="lblTime" runat="server" Width="136px"></asp:Label></div>
</form>
</body>
</html> |
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Add a function for displaying the time interval between mouse clicks of the button
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Dim CurrentTime As Long If Not Page.IsPostBack Then
lblTime.Text = "" CurrentTime = 0 Session("LastTime") = New Long() Session("Frequency") = New Long() If Not QueryPerformanceFrequency(Session("Frequency")) Then
lblTime.Text = "Error:Server doesn't support performance counter"
btnSubmit.Enabled = False End If Else
If QueryPerformanceCounter(CurrentTime) And Session("LastTime") <> 0 Then
lblTime.Text = lblTime.Text & ((CurrentTime - Session("LastTime")) / Session("Frequency")).ToString() & "second since last click.<br>" Else
lblTime.Text = lblTime.Text & "Please click again.<br>" End If Session("LastTime") = CurrentTime End If |
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