form1.cs

案例经典

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

namespace Example041_翻转图片的颜色
{
	/// <summary>
	/// Form1 的摘要说明。
	/// </summary>
	public class Form1 : System.Windows.Forms.Form
	{
		private System.Windows.Forms.Button button1;
		private System.Windows.Forms.OpenFileDialog openFileDialog1;
		private System.Windows.Forms.PictureBox pictureBox1;
		private System.Windows.Forms.PictureBox pictureBox2;
		/// <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 Form Designer generated code
		/// <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.button1 = new System.Windows.Forms.Button();
			this.openFileDialog1 = new System.Windows.Forms.OpenFileDialog();
			this.pictureBox1 = new System.Windows.Forms.PictureBox();
			this.pictureBox2 = new System.Windows.Forms.PictureBox();
			this.SuspendLayout();
			// 
			// button1
			// 
			this.button1.Location = new System.Drawing.Point(160, 192);
			this.button1.Name = "button1";
			this.button1.TabIndex = 4;
			this.button1.Text = "Open";
			this.button1.Click += new System.EventHandler(this.button1_Click);
			// 
			// pictureBox1
			// 
			this.pictureBox1.Location = new System.Drawing.Point(8, 8);
			this.pictureBox1.Name = "pictureBox1";
			this.pictureBox1.Size = new System.Drawing.Size(104, 176);
			this.pictureBox1.TabIndex = 3;
			this.pictureBox1.TabStop = false;
			// 
			// pictureBox2
			// 
			this.pictureBox2.Location = new System.Drawing.Point(128, 8);
			this.pictureBox2.Name = "pictureBox2";
			this.pictureBox2.Size = new System.Drawing.Size(104, 176);
			this.pictureBox2.TabIndex = 5;
			this.pictureBox2.TabStop = false;
			// 
			// Form1
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
			this.ClientSize = new System.Drawing.Size(240, 221);
			this.Controls.AddRange(new System.Windows.Forms.Control[] {
																		  this.pictureBox2,
																		  this.pictureBox1,
																		  this.button1});
			this.Name = "Form1";
			this.Text = "Form1";
			this.Load += new System.EventHandler(this.Form1_Load);
			this.ResumeLayout(false);

		}
		#endregion

		/// <summary>
		/// 应用程序的主入口点。
		/// </summary>
		[STAThread]
		static void Main() 
		{
			Application.Run(new Form1());
		}
		[System.Runtime.InteropServices.DllImport("gdi32")]
		private static extern int StretchBlt(IntPtr hDestDC,int x,int y,int nWidth,
			int nHeight,IntPtr hSrcDC,int xSrc,int ySrc,int WidthSrc,int HeightSrc,int dwRop);
		const int NOTSRCCOPY = 0x330008;
		//声明所需函数和常量
	
		[System.Runtime.InteropServices.DllImport("user32")]
		private static extern IntPtr GetDC(IntPtr hwnd);

		IntPtr hDC1,hDC2;
		Graphics g1,g2;
		private void button1_Click(object sender, System.EventArgs e)
		{
			if(this.openFileDialog1.ShowDialog()==DialogResult.OK)
			{
				Bitmap bmp;
				bmp=new Bitmap(this.openFileDialog1.FileName);
				this.pictureBox1.Image=bmp;
				this.pictureBox1.Refresh();
		
				hDC1=g1.GetHdc();
				hDC2=g2.GetHdc();
				StretchBlt(hDC2,0,0,this.pictureBox2.Width,this.pictureBox2.Height,
					hDC1,0,0,this.pictureBox1.Width,this.pictureBox1.Height,NOTSRCCOPY);
				g1.ReleaseHdc(hDC1);
				g2.ReleaseHdc(hDC2);
			}
		}

		private void Form1_Load(object sender, System.EventArgs e)
		{
			this.pictureBox1.SizeMode=PictureBoxSizeMode.StretchImage;
			this.pictureBox2.SizeMode=PictureBoxSizeMode.StretchImage;
			g1=this.pictureBox1.CreateGraphics();
			g2=this.pictureBox2.CreateGraphics();
		}
	}
}