C# 启动电话拨号程序

【核心代码】

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Runtime.InteropServices;  
namespace Tel
{
	/// <summary>
	/// Form1 的摘要说明。
	/// </summary>
	public class Form1 : System.Windows.Forms.Form
	{
		private System.Windows.Forms.Label label1;
		private System.Windows.Forms.Button button1;
		private System.Windows.Forms.TextBox textBox1;
		private System.Windows.Forms.Button button2;
		/// <summary>
		/// 必需的设计器变量。
		/// </summary>
		private System.ComponentModel.Container components = null;

		public Form1()
		{
			//
			// Windows 窗体设计器支持所必需的
			//
			InitializeComponent();

			//
			// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
			//
		}

		/// <summary>
		/// 清理所有正在使用的资源。
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if (components != null) 
				{
					components.Dispose();
				}
			}
			base.Dispose( disposing );
		}

		#region Windows 窗体设计器生成的代码
		/// <summary>
		/// 设计器支持所需的方法 - 不要使用代码编辑器修改
		/// 此方法的内容。
		/// </summary>
		private void InitializeComponent()
		{
			this.label1 = new System.Windows.Forms.Label();
			this.button1 = new System.Windows.Forms.Button();
			this.textBox1 = new System.Windows.Forms.TextBox();
			this.button2 = new System.Windows.Forms.Button();
			this.SuspendLayout();
			// 
			// label1
			// 
			this.label1.Location = new System.Drawing.Point(24, 32);
			this.label1.Name = "label1";
			this.label1.Size = new System.Drawing.Size(72, 16);
			this.label1.TabIndex = 0;
			this.label1.Text = "电话号码：";
			// 
			// button1
			// 
			this.button1.Location = new System.Drawing.Point(48, 64);
			this.button1.Name = "button1";
			this.button1.TabIndex = 1;
			this.button1.Text = "拨号";
			this.button1.Click  = new System.EventHandler(this.button1_Click);
			// 
			// textBox1
			// 
			this.textBox1.Location = new System.Drawing.Point(104, 24);
			this.textBox1.Name = "textBox1";
			this.textBox1.Size = new System.Drawing.Size(136, 21);
			this.textBox1.TabIndex = 2;
			this.textBox1.Text = "95868";
			// 
			// button2
			// 
			this.button2.Location = new System.Drawing.Point(144, 64);
			this.button2.Name = "button2";
			this.button2.TabIndex = 3;
			this.button2.Text = "关闭";
			this.button2.Click  = new System.EventHandler(this.button2_Click);
			// 
			// Form1
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
			this.ClientSize = new System.Drawing.Size(264, 110);
			this.Controls.Add(this.button2);
			this.Controls.Add(this.textBox1);
			this.Controls.Add(this.button1);
			this.Controls.Add(this.label1);
			this.MaximizeBox = false;
			this.Name = "Form1";
			this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
			this.Text = "演示电话拨号";
			this.ResumeLayout(false);

		}
		#endregion

		/// <summary>
		/// 应用程序的主入口点。
		/// </summary>
		[STAThread]
		static void Main() 
		{
			Application.Run(new Form1());
		}
		[DllImport("Tapi32.dll")]
		public static extern bool tapiRequestMakeCall( string lpszDestAddress,string lpszAppName,string lpszCalledParty,string lpszComment);	
		private void button1_Click(object sender, System.EventArgs e)
		{//拨号
			string strnumber=this.textBox1.Text;
			if(strnumber.Length<1)
				return;
			try
			{
				tapiRequestMakeCall(strnumber, "拨号", strnumber, "");
			}
			catch(Exception Err)
			{
				MessageBox.Show("拨号失败：" Err.Message,"信息提示",MessageBoxButtons.OK,MessageBoxIcon.Information);
			}        
		}
		private void button2_Click(object sender, System.EventArgs e)
		{//关闭应用程序
			this.Close();		
		}
	}
}