Control study -> 图像格式转换 如:将*.jpg -> *.gif进行转换

(一).功能

      一个演示图像格式转换的示例程序.
      支持格式:  bmp jpeg gif tiff png wmf 等之间的相互转换

(二).图片示例

(二).代码(整个后台代码)

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.IO;
using System.Drawing.Imaging;
namespace 图像格式转换
{
 /// <summary>
 /// Form1 的摘要说明。
 /// </summary>
 public class FormMain : System.Windows.Forms.Form
 {
  private System.Windows.Forms.Panel panel1;
  private System.Windows.Forms.Splitter splitter1;
  private System.Windows.Forms.Panel panel2;
  private System.Windows.Forms.Button buttonOpen;
  private System.Windows.Forms.Button buttonConvert;
  private System.Windows.Forms.ComboBox comboBox;
  private System.Windows.Forms.Label label1;
  private System.Windows.Forms.Label label2;
  /// <summary>
  /// 必需的设计器变量。
  /// </summary>
  private System.ComponentModel.Container components = null;
  private System.Windows.Forms.PictureBox pictureBox;
  private System.Drawing.Bitmap bitmap;

  public FormMain()
  {
   //
   // 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
   //
   bitmap=null;
   pictureBox.Width=panel2.Width;
   pictureBox.Height=panel2.Height;
   pictureBox.Top=panel1.Top;
   pictureBox.Left=panel1.Left;
   panel2.Resize+=new System.EventHandler(panel2_Resize);
   //buttonOpen.Click+=new System.EventHandler(buttonOpen_Click);
   comboBox.Items.AddRange(new object[]{
                                                    "*.jpg",
                                                    "*.bmp",
                                        "*.gif",
                                        "*.png",
                                        "*.tif",
                                        "*.wmf"
            });
   
  }

  /// <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.panel1 = new System.Windows.Forms.Panel();
   this.buttonConvert = new System.Windows.Forms.Button();
   this.buttonOpen = new System.Windows.Forms.Button();
   this.comboBox = new System.Windows.Forms.ComboBox();
   this.label1 = new System.Windows.Forms.Label();
   this.label2 = new System.Windows.Forms.Label();
   this.splitter1 = new System.Windows.Forms.Splitter();
   this.panel2 = new System.Windows.Forms.Panel();
   this.pictureBox = new System.Windows.Forms.PictureBox();
   this.panel1.SuspendLayout();
   this.panel2.SuspendLayout();
   this.SuspendLayout();
   //
   // panel1
   //
   this.panel1.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
   this.panel1.Controls.AddRange(new System.Windows.Forms.Control[] {
                     this.buttonConvert,
                     this.buttonOpen,
                     this.comboBox,
                     this.label1,
                     this.label2});
   this.panel1.Dock = System.Windows.Forms.DockStyle.Left;
   this.panel1.Name = "panel1";
   this.panel1.Size = new System.Drawing.Size(128, 365);
   this.panel1.TabIndex = 0;
   //
   // buttonConvert
   //
   this.buttonConvert.Location = new System.Drawing.Point(40, 264);
   this.buttonConvert.Name = "buttonConvert";
   this.buttonConvert.Size = new System.Drawing.Size(56, 24);
   this.buttonConvert.TabIndex = 1;
   this.buttonConvert.Text = "转换";
   buttonConvert.Click+=new System.EventHandler(buttonConvert_Click);
   //
   // buttonOpen
   //
   this.buttonOpen.Location = new System.Drawing.Point(32, 56);
   this.buttonOpen.Name = "buttonOpen";
   this.buttonOpen.Size = new System.Drawing.Size(64, 24);
   this.buttonOpen.TabIndex = 0;
   this.buttonOpen.Text = "打开文件";
   this.buttonOpen.Click += new System.EventHandler(this.buttonOpen_Click);
   //
   // comboBox
   //
   this.comboBox.Location = new System.Drawing.Point(64, 224);
   this.comboBox.Name = "comboBox";
   this.comboBox.Size = new System.Drawing.Size(48, 20);
   this.comboBox.TabIndex = 0;
   this.comboBox.Text = "comboBox1";
   //
   // label1
   //
   this.label1.Location = new System.Drawing.Point(24, 104);
   this.label1.Name = "label1";
   this.label1.Size = new System.Drawing.Size(80, 40);
   this.label1.TabIndex = 0;
   this.label1.Text = "label1";
   //
   // label2
   //
   this.label2.Location = new System.Drawing.Point(8, 224);
   this.label2.Name = "label2";
   this.label2.Size = new System.Drawing.Size(48, 16);
   this.label2.TabIndex = 0;
   this.label2.Text = "转换为";
   //
   // splitter1
   //
   this.splitter1.Location = new System.Drawing.Point(128, 0);
   this.splitter1.Name = "splitter1";
   this.splitter1.Size = new System.Drawing.Size(3, 365);
   this.splitter1.TabIndex = 1;
   this.splitter1.TabStop = false;
   //
   // panel2
   //
   this.panel2.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
   this.panel2.Controls.AddRange(new System.Windows.Forms.Control[] {
                     this.pictureBox});
   this.panel2.Dock = System.Windows.Forms.DockStyle.Fill;
   this.panel2.Location = new System.Drawing.Point(131, 0);
   this.panel2.Name = "panel2";
   this.panel2.Size = new System.Drawing.Size(373, 365);
   this.panel2.TabIndex = 2;
   //
   // pictureBox
   //
   this.pictureBox.Dock = System.Windows.Forms.DockStyle.Fill;
   this.pictureBox.Name = "pictureBox";
   this.pictureBox.Size = new System.Drawing.Size(369, 361);
   this.pictureBox.SizeMode = System.Windows.Forms.PictureBoxSizeMode.StretchImage;
   this.pictureBox.TabIndex = 0;
   this.pictureBox.TabStop = false;
   //
   // FormMain
   //
   this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
   this.ClientSize = new System.Drawing.Size(504, 365);
   this.Controls.AddRange(new System.Windows.Forms.Control[] {
                    this.panel2,
                    this.splitter1,
                    this.panel1});
   this.Name = "FormMain";
   this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
   this.Text = "FormMain";
   this.panel1.ResumeLayout(false);
   this.panel2.ResumeLayout(false);
   this.ResumeLayout(false);

  }
  #endregion

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

  private void buttonOpen_Click(object sender, System.EventArgs e)
  {
   OpenFileDialog openFileDialog=new OpenFileDialog();
   openFileDialog.Filter="*.jpg,*.jpeg,*.bmp,*.gif,*.ico,*.png,*.tif,*.wmf|*.jpg;*.jpeg;*.bmp;*.gif;*.ico;*.png;*.tif;*.wmf";
   openFileDialog.Title="打开图像文件";
   openFileDialog.Multiselect=false;
   if(openFileDialog.ShowDialog()==DialogResult.OK)
   {
    if(bitmap!=null)
    {
     bitmap.Dispose();
    }
    string fileName=openFileDialog.FileName;
    bitmap=new Bitmap(fileName);
    if(bitmap.Width>bitmap.Width)
    {
     pictureBox.Width=panel2.Width;
     pictureBox.Height=(int)((double)bitmap.Height*panel2.Width/bitmap.Width);
    }
    else
    {
     pictureBox.Height=panel2.Height;
                    pictureBox.Width=(int)((double)bitmap.Width*panel2.Height/bitmap.Height);
    }
    pictureBox.Image=bitmap;
    FileInfo f=new FileInfo(fileName);
    this.Text="图象转换:"+f.Name;
    this.label1.Text=f.Name;
    buttonConvert.Enabled=true;
   }
  }
  private void panel2_Resize(object sender, System.EventArgs e)
  {
   pictureBox.Top=panel1.Top;
   pictureBox.Left=panel1.Left;
   if(bitmap!=null)
   {
    if(bitmap.Width>bitmap.Height)
    {
     pictureBox.Width=panel2.Width;
     pictureBox.Height=(int)((double) bitmap.Height*panel2.Width/bitmap.Width);
    }
    else
    {
     pictureBox.Height=panel2.Height;
     pictureBox.Width=(int)((double)bitmap.Width*panel2.Height/bitmap.Height);
    }
   }
   else
   {
    pictureBox.Width=panel2.Width;
    pictureBox.Height=panel2.Height;
   }
   pictureBox.Refresh();
  }
  private void buttonConvert_Click(object sender, System.EventArgs e)
  {
   if(comboBox.SelectedItem==null)
   {
    return;
   }
   else
   {
    SaveFileDialog saveFileDialog=new SaveFileDialog();
    saveFileDialog.Title="转化为:";
    saveFileDialog.OverwritePrompt=true;
       saveFileDialog.CheckPathExists=true;
    saveFileDialog.Filter=comboBox.Text+"|"+comboBox.Text;
    if(saveFileDialog.ShowDialog()==DialogResult.OK)
    {
     string fileName=saveFileDialog.FileName;
     switch(comboBox.Text)
     {
      case "*.bmp":
       bitmap.Save(fileName,ImageFormat.Bmp);
       break;
                        case "*.jpg":
       bitmap.Save(fileName,ImageFormat.Jpeg);
       break;
                        case "*.gif":
       bitmap.Save(fileName,ImageFormat.Gif);
       break;
                        case "*.tif":
       bitmap.Save(fileName,ImageFormat.Tiff);
       break;
                        case "*.png":
       bitmap.Save(fileName,ImageFormat.Png);
       break;
                        case "*.wmf":
       bitmap.Save(fileName,ImageFormat.Wmf);
       break;
                               
     }
     FileInfo f=new FileInfo(fileName);
     this.Text="图像转换:"+f.Name;
     label1.Text=f.Name;
    }
   }
  }
 }
}

(四).代码示例下载

     http://www.cnblogs.com/Files/ChengKing/图像格式转换.rar