login.cs

煤矿信息管理系统是基于SuperMap Object

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data.SqlClient;
using System.Data;

namespace MKIms3
{
	/// <summary>
	/// Login 的摘要说明。
	/// </summary>
	public class Login : System.Windows.Forms.Form
	{
		private string u_name;
		private string u_pass;
	

		public delegate void SendMessLogin () ;
		//定义委托类型
		public event SendMessLogin SendLogin ;

		private System.Windows.Forms.PictureBox pictureBox1;
		private System.Windows.Forms.Label label_U;
		private System.Windows.Forms.Label label_p;
		private System.Windows.Forms.TextBox txt_uname;
		private System.Windows.Forms.TextBox txt_upass;
		private System.Windows.Forms.Button btn_ok;
		private System.Windows.Forms.Button btn_esc;
		private System.Windows.Forms.ErrorProvider errP_user;
		/// <summary>
		/// 必需的设计器变量。
		/// </summary>
		private System.ComponentModel.Container components = null;

		public Login()
		{
			//
			// 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()
		{
			System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(Login));
			this.pictureBox1 = new System.Windows.Forms.PictureBox();
			this.label_U = new System.Windows.Forms.Label();
			this.label_p = new System.Windows.Forms.Label();
			this.txt_uname = new System.Windows.Forms.TextBox();
			this.txt_upass = new System.Windows.Forms.TextBox();
			this.btn_ok = new System.Windows.Forms.Button();
			this.btn_esc = new System.Windows.Forms.Button();
			this.errP_user = new System.Windows.Forms.ErrorProvider();
			this.SuspendLayout();
			// 
			// pictureBox1
			// 
			this.pictureBox1.Dock = System.Windows.Forms.DockStyle.Top;
			this.pictureBox1.Image = ((System.Drawing.Image)(resources.GetObject("pictureBox1.Image")));
			this.pictureBox1.Location = new System.Drawing.Point(0, 0);
			this.pictureBox1.Name = "pictureBox1";
			this.pictureBox1.Size = new System.Drawing.Size(386, 112);
			this.pictureBox1.TabIndex = 0;
			this.pictureBox1.TabStop = false;
			// 
			// label_U
			// 
			this.label_U.Location = new System.Drawing.Point(32, 121);
			this.label_U.Name = "label_U";
			this.label_U.Size = new System.Drawing.Size(56, 23);
			this.label_U.TabIndex = 1;
			this.label_U.Text = "用户名：";
			this.label_U.TextAlign = System.Drawing.ContentAlignment.MiddleLeft;
			// 
			// label_p
			// 
			this.label_p.Location = new System.Drawing.Point(200, 121);
			this.label_p.Name = "label_p";
			this.label_p.Size = new System.Drawing.Size(60, 23);
			this.label_p.TabIndex = 2;
			this.label_p.Text = "密   码：";
			this.label_p.TextAlign = System.Drawing.ContentAlignment.MiddleLeft;
			// 
			// txt_uname
			// 
			this.txt_uname.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
			this.txt_uname.Location = new System.Drawing.Point(83, 120);
			this.txt_uname.MaxLength = 10;
			this.txt_uname.Name = "txt_uname";
			this.txt_uname.TabIndex = 0;
			this.txt_uname.Text = "";
			// 
			// txt_upass
			// 
			this.txt_upass.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
			this.txt_upass.Location = new System.Drawing.Point(256, 120);
			this.txt_upass.MaxLength = 10;
			this.txt_upass.Name = "txt_upass";
			this.txt_upass.PasswordChar = '*';
			this.txt_upass.TabIndex = 1;
			this.txt_upass.Text = "";
			// 
			// btn_ok
			// 
			this.btn_ok.BackColor = System.Drawing.SystemColors.ActiveBorder;
			this.btn_ok.DialogResult = System.Windows.Forms.DialogResult.OK;
			this.btn_ok.FlatStyle = System.Windows.Forms.FlatStyle.Flat;
			this.btn_ok.Location = new System.Drawing.Point(168, 152);
			this.btn_ok.Name = "btn_ok";
			this.btn_ok.Size = new System.Drawing.Size(72, 24);
			this.btn_ok.TabIndex = 2;
			this.btn_ok.Text = "登陆系统";
			this.btn_ok.Click += new System.EventHandler(this.btn_ok_Click);
			// 
			// btn_esc
			// 
			this.btn_esc.DialogResult = System.Windows.Forms.DialogResult.Cancel;
			this.btn_esc.FlatStyle = System.Windows.Forms.FlatStyle.Flat;
			this.btn_esc.Location = new System.Drawing.Point(272, 151);
			this.btn_esc.Name = "btn_esc";
			this.btn_esc.Size = new System.Drawing.Size(72, 24);
			this.btn_esc.TabIndex = 3;
			this.btn_esc.Text = "退出登陆";
			this.btn_esc.Click += new System.EventHandler(this.btn_esc_Click);
			// 
			// errP_user
			// 
			this.errP_user.ContainerControl = this;
			// 
			// Login
			// 
			this.AcceptButton = this.btn_ok;
			this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
			this.BackColor = System.Drawing.SystemColors.ActiveBorder;
			this.CancelButton = this.btn_esc;
			this.ClientSize = new System.Drawing.Size(386, 186);
			this.Controls.Add(this.btn_esc);
			this.Controls.Add(this.btn_ok);
			this.Controls.Add(this.txt_upass);
			this.Controls.Add(this.txt_uname);
			this.Controls.Add(this.label_p);
			this.Controls.Add(this.label_U);
			this.Controls.Add(this.pictureBox1);
			this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedToolWindow;
			this.Icon = ((System.Drawing.Icon)(resources.GetObject("$this.Icon")));
			this.Name = "Login";
			this.ShowInTaskbar = false;
			this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
			this.Text = "系统登陆";
			this.TopMost = true;
			this.Closing += new System.ComponentModel.CancelEventHandler(this.Login_Closing);
			this.ResumeLayout(false);

		}
		#endregion
         
		/// <summary>
		/// 单击验证用户的身份
		/// </summary>
		/// <param name="sender"></param>
		/// <param name="e"></param>
		private void btn_ok_Click(object sender, System.EventArgs e)
		{			
			Splasher.Status="正在检测用户名和密码......";
			if(loing_first()==true)
			{
				this.Visible = false;
				SendLogin();
			}			
		}

		private bool LoginCheck()
		{
			this.u_name = this.txt_uname.Text.Trim();
			this.u_pass = this.txt_upass.Text.Trim(); 
			DataBase myDB = new DataBase();
			SqlDataReader myReader = null;
			SqlParameter[] myParamers={new SqlParameter("@u_name",SqlDbType.Char,10)} ;
			myParamers[0].Value = this.u_name;
			myReader = myDB.RunProcedure("up_get_upass",myParamers);
			if(myReader!=null)
			{
				if(myReader.Read())
				{
					if(myReader["u_pass"].ToString().Trim()==this.u_pass)
					{
						Splasher.Status = "用户验证通过，开始加载系统数据...";
						App.u_name = myReader["u_name"].ToString();
						if(myReader["u_flag"]==null)
						{
							App.u_flag = (int)flag.user;
						}
						else
						{
							App.u_flag = Convert.ToInt32(myReader["u_flag"]);
						}
						myReader.Close();
						return true;
						
					}
					else
					{
						MessageBox.Show("对不起，密码错误！","错误",MessageBoxButtons.OK,MessageBoxIcon.Warning);
						myReader.Close();
						return false;
									
					}
				}
				else
				{
					MessageBox.Show("该用户不存在，请检查您的输入是否有误！","错误",MessageBoxButtons.OK,MessageBoxIcon.Warning);
					myReader.Close();
					return false;
							    
				}
			}
			else
			{
				return false;
			}
		}
		/// <summary>
		/// 开始登陆验证前的数据检查工作
		/// </summary>
		private bool loing_first()
		{
			if(u_name_isnull() || u_pass_isnull())
			{
				MessageBox.Show("对不起用户名和密码不能为空！","错误",MessageBoxButtons.OK,MessageBoxIcon.Warning);
				return false;
			}
			else
			{
				return LoginCheck();
			}
		}
        /// <summary>
        /// 检测用户名是否为空
        /// </summary>
        /// <returns></returns>
		private bool u_name_isnull()
		{
			return (this.txt_uname.Text.Trim().Length==0);
		}
		/// <summary>
		/// 检测用户密码是否为空
		/// </summary>
		/// <returns></returns>
		private bool u_pass_isnull()
		{
			return (this.txt_upass.Text.Trim().Length==0);
		}
		/// <summary>
		/// 取消登陆，退出程序
		/// </summary>
		/// <param name="sender"></param>
		/// <param name="e"></param>
		private void btn_esc_Click(object sender, System.EventArgs e)
		{
			this.Close();
			Application.Exit();
		}

		private void Login_Closing(object sender, System.ComponentModel.CancelEventArgs e)
		{
			Application.Exit();
		}			
		
	}
}