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Image 读取,该如何处理

热度:5163   发布时间:2013-02-26 00:00:00.0
Image 读取
怎么直接从数据库中判断Image类型字段的记录是否相等

------解决方案--------------------------------------------------------
用二进制比较试试。
------解决方案--------------------------------------------------------
image无法直接比较,他要比较的话,得逐字节比较

实际上你可以提取image的MD5值作为特征值,然后比较其特征值是否相等
------解决方案--------------------------------------------------------
逐字节比较的例子
C# code
using System;using System.Data;using System.Data.SqlClient;using System.Configuration;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Web.UI.HtmlControls;using System.Collections;using System.IO;public partial class _Default : System.Web.UI.Page{    protected void Page_Load(object sender, EventArgs e)    {        byte[] temp1 = getImage("d://1.jpg");        byte[] temp2 = getImage("d://2.jpg");        bool isEqual=true;        //判断图片是否相等        if (temp1.Length==temp2.Length)        {            for (int i = 0; i < temp1.Length; i++)            {                if (temp1[i] != temp2[i])                {                    isEqual = false;                }            }        }        else        {            isEqual = false;        }        if (isEqual)        {            Response.Write("<script>alert('两图片相等')</script>");        }        else        {            Response.Write("<script>alert('两图片不相等')</script>");        }    }    /// <summary>    /// 按图片路径把图片打成二进制流    /// </summary>    /// <param name="path">图片路径</param>    /// <returns></returns>    public byte[] getImage(string path)    {        FileStream fs = File.OpenRead(path);        MemoryStream ms = new MemoryStream();        int bdata;        while ((bdata = fs.ReadByte()) != -1)        {            ms.WriteByte(((byte)bdata));        }        byte[] data = (byte[])ms.ToArray();        fs.Close();        ms.Close();        fs = null;        ms = null;        return data;    }}
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