操作图片类(C#)

最新推荐文章于 2019-07-16 06:23:49 发布

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本文介绍了一个图片压缩类ImageClass，该类提供了多种压缩图片的方法，包括按比例压缩并返回新的图片对象或保存到指定路径，以及直接指定宽度和高度进行压缩。

using System;
using System.Drawing;
using System.Drawing.Imaging;

namespace Baolee.GeneralMethod
{
/// <summary>
/// ImageClass 的摘要说明。
/// </summary>
public class ImageClass
{

  // Fields
  public string ErrMessage;
  private int ImageHeight;
  private int ImageWidth;
  private Image ResourceImage;

  /// <summary>
  ///
  /// </summary>
  /// <param name="ImageFileName"></param>
  public ImageClass(string ImageFileName)
  {
   this.ResourceImage = Image.FromFile(ImageFileName);
   this.ErrMessage = "";
  }
  /// <summary>
  ///
  /// </summary>
  /// <param name="Percent"></param>
  /// <returns></returns>
  public Image GetReducedImage(double Percent)
  {
   try
   {
    Image.GetThumbnailImageAbort callback = new Image.GetThumbnailImageAbort(this.ThumbnailCallback);
    this.ImageWidth = Convert.ToInt32((double) (this.ResourceImage.Width * Percent));
    this.ImageHeight = Convert.ToInt32((double) (this.ResourceImage.Width * Percent));
    return this.ResourceImage.GetThumbnailImage(this.ImageWidth, this.ImageHeight, callback, IntPtr.Zero);
   }
   catch (Exception exception)
   {
    this.ErrMessage = exception.Message;
    return null;
   }
  }
  /// <summary>
  ///
  /// </summary>
  /// <param name="Percent"></param>
  /// <param name="targetFilePath"></param>
  /// <returns></returns>
  public bool GetReducedImage(double Percent, string targetFilePath)
  {
   try
   {
    Image.GetThumbnailImageAbort callback = new Image.GetThumbnailImageAbort(this.ThumbnailCallback);
    this.ImageWidth = Convert.ToInt32((double) (this.ResourceImage.Width * Percent));
    this.ImageHeight = Convert.ToInt32((double) (this.ResourceImage.Width * Percent));
    Image image = this.ResourceImage.GetThumbnailImage(this.ImageWidth, this.ImageHeight, callback, IntPtr.Zero);
    image.Save(targetFilePath, ImageFormat.Jpeg);
    image.Dispose();
    return true;
   }
   catch (Exception exception)
   {
    this.ErrMessage = exception.Message;
    return false;
   }
  }
  /// <summary>
  ///
  /// </summary>
  /// <param name="Width"></param>
  /// <param name="Height"></param>
  /// <returns></returns>
  public Image GetReducedImage(int Width, int Height)
  {
   try
   {
    Image.GetThumbnailImageAbort callback = new Image.GetThumbnailImageAbort(this.ThumbnailCallback);
    return this.ResourceImage.GetThumbnailImage(Width, Height, callback, IntPtr.Zero);
   }
   catch (Exception exception)
   {
    this.ErrMessage = exception.Message;
    return null;
   }
  }
  /// <summary>
  ///
  /// </summary>
  /// <param name="Width"></param>
  /// <param name="Height"></param>
  /// <param name="targetFilePath"></param>
  /// <returns></returns>
  public bool GetReducedImage(int Width, int Height, string targetFilePath)
  {
   try
   {
    Image.GetThumbnailImageAbort callback = new Image.GetThumbnailImageAbort(this.ThumbnailCallback);
    Image image = this.ResourceImage.GetThumbnailImage(Width, Height, callback, IntPtr.Zero);
    image.Save(targetFilePath);
    image.Dispose();
    return true;
   }
   catch (Exception exception)
   {
    this.ErrMessage = exception.Message;
    return false;
   }
  }
  /// <summary>
  ///
  /// </summary>
  /// <returns></returns>
  public bool ThumbnailCallback()
  {
   return false;
  }
}
}