• c#生成图片缩略图的类


    里面有4个重载方法,有直接返回Image对象的,有生成缩略图,并且保存到指定目录的!

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

    /**//// <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 ilename.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 ilename.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;
            }
        }
    }

    本文来自CSDN博客,转载请标明出处:http://blog.csdn.net/useruse/archive/2008/05/19/2458751.aspx

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  • 原文地址:https://www.cnblogs.com/scgw/p/1915459.html
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