c#產生圖片縮圖的類

裡面有4個重載方法,有直接返回Image對象的,有產生縮圖,並且儲存到指定目錄的!

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

/**//// <summary>
/// 圖片處理類
/// 1、產生縮圖片或按照比例改變圖片的大小和畫質
/// 2、將產生的縮圖放到指定的目錄下
/// </summary>
public class ImageClass
...{
    public Image ResourceImage;
    private int ImageWidth;
    private int ImageHeight;

    public string ErrMessage;

    /**//// <summary>
    /// 類的建構函式
    /// </summary>
    /// <param name="ImageFileName">圖片檔案的全路徑名稱</param>
    public ImageClass(string ImageFileName)
    ...{
        ResourceImage=Image.FromFile(ImageFileName);
        ErrMessage="";
    }

    public bool ThumbnailCallback()
    ...{
        return false;
    }

    /**//// <summary>
    /// 產生縮圖重載方法1，返回縮圖的Image對象
    /// </summary>
    /// <param name="Width">縮圖的寬度</param>
    /// <param name="Height">縮圖的高度</param>
    /// <returns>縮圖的Image對象</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>
    /// 產生縮圖重載方法2，將縮圖檔案儲存到指定的路徑
    /// </summary>
    /// <param name="Width">縮圖的寬度</param>
    /// <param name="Height">縮圖的高度</param>
    /// <param name="targetFilePath">縮圖儲存的全檔案名稱，(帶路徑)，參數格式：D:Images ilename.jpg</param>
    /// <returns>成功返回true，否則返回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>
    /// 產生縮圖重載方法3，返回縮圖的Image對象
    /// </summary>
    /// <param name="Percent">縮圖的寬度百分比 如：需要百分之80，就填0.8</param>   
    /// <returns>縮圖的Image對象</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>
    /// 產生縮圖重載方法4，返回縮圖的Image對象
    /// </summary>
    /// <param name="Percent">縮圖的寬度百分比 如：需要百分之80，就填0.8</param>   
    /// <param name="targetFilePath">縮圖儲存的全檔案名稱，(帶路徑)，參數格式：D:Images ilename.jpg</param>
    /// <returns>成功返回true,否則返回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;
        }
    }
}

本文來自CSDN部落格，轉載請標明出處：http://blog.csdn.net/useruse/archive/2008/05/19/2458751.aspx