图片压缩为缩略图代码,CSharp代码库,德仔网

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【CSharp】图片压缩为缩略图
作者:Dezai.CN / 发布于2013/1/4/ 534
using System.IO;
using System.Drawing;
using System.Drawing.Imaging;
using System;
namespace 图片压缩
{
    /// <summary>
    /// 图片处理类
    /// 1、生成缩略图片或按照比例改变图片的大小和画质
    /// 2、将生成的缩略图放到指定的目录下
    /// </summary>
    public class ImageClass
    {
        public Image ResourceImage;
        private int ImageWidth;
        private int ImageHeight;
        public string ErrMessage;
        /// <summary>
        /// 类的构造函数
        /// </summary>
        /// <param name="ImageFileName">图片文件的全路径名称</param>
        public ImageClass(string ImageFileName)
        {
            ResourceImage = Image.FromFile(ImageFileName);
            ErrMessage = "";
        }
        public bool ThumbnailCallback()
        {
            return false;
        }
        /// <summary>
        /// 生成缩略图重载方法1，返回缩略图的Image对象
        /// </summary>
        /// <param name="Width">缩略图的宽度</param>
        /// <param name="Height">缩略图的高度</param>
        /// <returns>缩略图的Image对象</returns>
        public Image GetReducedImage(int Width, int Height)
        {
            try
            {
                Image ReducedImage;
                Image.GetThumbnailImageAbort callb = new Image.GetThumbnailImageAbort(ThumbnailCallback);

                ReducedImage = ResourceImage.GetThumbnailImage(Width, Height, callb, IntPtr.Zero);

                return ReducedImage;
            }
            catch (Exception e)
            {
                ErrMessage = e.Message;
                return null;
            }
        }
        /// <summary>
        /// 生成缩略图重载方法2，将缩略图文件保存到指定的路径
        /// </summary>
        /// <param name="Width">缩略图的宽度</param>
        /// <param name="Height">缩略图的高度</param>
        /// <param name="targetFilePath">缩略图保存的全文件名，(带路径)，参数格式：D:\Images\filename.jpg</param>
        /// <returns>成功返回true，否则返回false</returns>
        public bool GetReducedImage(int Width, int Height, string targetFilePath)
        {
            try
            {
                Image ReducedImage;
                Image.GetThumbnailImageAbort callb = new Image.GetThumbnailImageAbort(ThumbnailCallback);

                ReducedImage = ResourceImage.GetThumbnailImage(Width, Height, callb, IntPtr.Zero);
                ReducedImage.Save(@targetFilePath, ImageFormat.Jpeg);
                ReducedImage.Dispose();

                return true;
            }
            catch (Exception e)
            {
                ErrMessage = e.Message;
                return false;
            }
        }
        /// <summary>
        /// 生成缩略图重载方法3，返回缩略图的Image对象
        /// </summary>
        /// <param name="Percent">缩略图的宽度百分比 如：需要百分之80，就填0.8</param>  
        /// <returns>缩略图的Image对象</returns>
        public Image GetReducedImage(double Percent)
        {
            try
            {
                Image ReducedImage;
                Image.GetThumbnailImageAbort callb = new Image.GetThumbnailImageAbort(ThumbnailCallback);
                ImageWidth = Convert.ToInt32(ResourceImage.Width * Percent);
                ImageHeight = Convert.ToInt32(ResourceImage.Width * Percent);

                ReducedImage = ResourceImage.GetThumbnailImage(ImageWidth, ImageHeight, callb, IntPtr.Zero);

                return ReducedImage;
            }
            catch (Exception e)
            {
                ErrMessage = e.Message;
                return null;
            }
        }
        /// <summary>
        /// 生成缩略图重载方法4，返回缩略图的Image对象
        /// </summary>
        /// <param name="Percent">缩略图的宽度百分比 如：需要百分之80，就填0.8</param>  
        /// <param name="targetFilePath">缩略图保存的全文件名，(带路径)，参数格式：D:\Images\filename.jpg</param>
        /// <returns>成功返回true,否则返回false</returns>
        public bool GetReducedImage(double Percent, string targetFilePath)
        {
            try
            {
                Image ReducedImage;
                Image.GetThumbnailImageAbort callb = new Image.GetThumbnailImageAbort(ThumbnailCallback);
                ImageWidth = Convert.ToInt32(ResourceImage.Width * Percent);
                ImageHeight = Convert.ToInt32(ResourceImage.Width * Percent);

                ReducedImage = ResourceImage.GetThumbnailImage(ImageWidth, ImageHeight, callb, IntPtr.Zero);
                ReducedImage.Save(@targetFilePath, ImageFormat.Jpeg);

                ReducedImage.Dispose();

                return true;
            }
            catch (Exception e)
            {
                ErrMessage = e.Message;
                return false;
            }
        }

    }
}
试试其它关键字
　缩略图　
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