C#画图

 

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Runtime.InteropServices;
namespace WindowsApplication4
 ...{
    /**//**//**//// <summary>
    /// Form1 的摘要说明。
    /// </summary>
    public class Form1 : System.Windows.Forms.Form
     ...{
        private Image bm;
        private System.Windows.Forms.TextBox textBox1;
        
        /**//**//**//// <summary>
        /// 必需的设计器变量。
        /// </summary>
        private System.ComponentModel.Container components = null;

        [ System.Runtime.InteropServices.DllImportAttribute ( "gdi32.dll" ) ]
        private static extern bool BitBlt (
            IntPtr hdcDest , //目标设备的句柄
            int nXDest , // 目标对象的左上角的X坐标
            int nYDest , // 目标对象的左上角的X坐标
            int nWidth , // 目标对象的矩形的宽度
            int nHeight , // 目标对象的矩形的长度
            IntPtr hdcSrc , // 源设备的句柄
            int nXSrc , // 源对象的左上角的X坐标
            int nYSrc , // 源对象的左上角的X坐标
            System.Int32 dwRop // 光栅的操作值
            ) ;

        [ System.Runtime.InteropServices.DllImportAttribute ( "gdi32.dll" ) ]
        private static extern IntPtr CreateDC (
            string lpszDriver , // 驱动名称
            string lpszDevice , // 设备名称
            string lpszOutput , // 无用，可以设定位"NULL"
            IntPtr lpInitData // 任意的打印机数据
            ) ;

        public Form1()
         ...{
            Screen scr=Screen.AllScreens[0];
            string str=scr.Bounds.Height+":"+scr.Bounds.Width;
            //MessageBox.Show(str);
            IntPtr dc1=CreateDC("DISPLAY",null,null,(IntPtr)null);
            Graphics g1=Graphics.FromHdc(dc1);
            bm=new Bitmap(scr.Bounds.Width,scr.Bounds.Height,g1);            
            Graphics g2=Graphics.FromImage(bm);
            IntPtr dc2=g1.GetHdc();
            IntPtr dc3=g2.GetHdc();
            BitBlt(dc3,0,0,scr.Bounds.Width,scr.Bounds.Height,dc2,0,0,13369376);
            g1.ReleaseHdc(dc1);
            g2.ReleaseHdc(dc3);    
            g1.Dispose();
            g2.Dispose();            
            // 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
            //
            bm.Save("d:/a.jpg");
        }

        /**//**//**//// <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 );
        }

        Windows 窗体设计器生成的代码#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.textBox1 = new System.Windows.Forms.TextBox();
            this.SuspendLayout();
            // 
            // textBox1
            // 
            this.textBox1.Location = new System.Drawing.Point(208, 64);
            this.textBox1.Name = "textBox1";
            this.textBox1.TabIndex = 0;
            this.textBox1.Text = "textBox1";
            // 
            // Form1
            // 
            this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
            this.ClientSize = new System.Drawing.Size(704, 293);
            this.Controls.Add(this.textBox1);
            this.Name = "Form1";
            this.Text = "Form1";
            this.Resize += new System.EventHandler(this.Form1_Resize);
            this.Paint += new System.Windows.Forms.PaintEventHandler(this.Form1_Paint);
            this.ResumeLayout(false);

        }
        #endregion

        /**//**//**//// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        [STAThread]
        static void Main() 
         ...{
            Application.Run(new Form1());
        }

        protected void Form1_Paint(object sender, PaintEventArgs e)
        ...{
            this.Invalidate(null,true);
        }
        protected override void OnPaint ( System.Windows.Forms.PaintEventArgs e )            
        ...{    
            Graphics g3=this.CreateGraphics();
            PointF ulCorner = new PointF(0,0);
            PointF urCorner = new PointF(this.Right-10,0);
            textBox1.Text=this.Right+":"+this.Bottom;
            PointF llCorner = new PointF(0,this.Bottom-10);
            PointF[] destPara = ...{ulCorner, urCorner, llCorner};
            g3.DrawImage(bm,destPara);
            Graphics   cjg=this.CreateGraphics();   
            Pen   cjpen=new   Pen(Color.Red);   
            cjg.DrawLine(cjpen,0,0,this.Right+200,this.Bottom);   

            //this.BackgroundImage=bm;
        }

        /**//*private void Form1_Activated(object sender, EventArgs e)
        {            
            Graphics g3=this.CreateGraphics();
            PointF ulCorner = new PointF(0,0);
            PointF urCorner = new PointF(600,0);
            PointF llCorner = new PointF(0,300);
            PointF[] destPara = {ulCorner, urCorner, llCorner};
            g3.DrawImage(bm,destPara);
        }*/

        private void Form1_Resize(object sender, EventArgs e)
        ...{
            this.Invalidate(null,true);
        }
    }
}