如何将文本流形式的图片在页面中显示出来?

Bitmap类，构造函数传入stream。

TO: shrinerain(圣影雨)
构造了Bitmap后呢,要怎样显示出来呀?恕小弟愚昧,能否提供一下代码.

给你个简单事例:
后台代码:
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;
namespace CommonFunction.test
{
/// <summary>
/// ValitionNO 的摘要说明。
/// </summary>
public class ValidateCode : System.Web.UI.Page
{
protected System.Web.UI.WebControls.Panel Panel1;

private void Page_Load(object sender, System.EventArgs e)
{

if(!this.IsPostBack)
{
this.CreateCheckCodeImage(GenerateCheckCode());
}
}
private string GenerateCheckCode()
{
int number;
char code;
string checkCode = String.Empty; System.Random rd = new Random(); int i=1000 + rd.Next(8999); checkCode =i.ToString(); Response.Cookies.Add(new HttpCookie("CheckCode", checkCode)); return checkCode;
} private void CreateCheckCodeImage(string checkCode)
{
if(checkCode == null || checkCode.Trim() == String.Empty)
return; System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * 12.5)), 22);
Graphics g = Graphics.FromImage(image); try
{
//生成随机生成器
Random random = new Random(); //清空图片背景色
g.Clear(Color.Gainsboro);
//Font font = new Font("Times New Roman",13);
Font font = new System.Drawing.Font("Arial", 12, (System.Drawing.FontStyle.Bold | System.Drawing.FontStyle.Regular));
System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 1.2f, true);
g.DrawString(checkCode, font, brush, 2, 2); //画图片的边框线
g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1); System.IO.MemoryStream ms = new System.IO.MemoryStream();
image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
Response.ClearContent();
Response.ContentType = "image/Gif";
Response.BinaryWrite(ms.ToArray());
}
finally
{
g.Dispose();
image.Dispose();
}
} #region Web 窗体设计器生成的代码
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
//
InitializeComponent();
base.OnInit(e);
}

/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.Load += new System.EventHandler(this.Page_Load); }
#endregion
}
}
HTML代码:
<%@ Page language="c#" Codebehind="CheckCode1.aspx.cs" AutoEventWireup="false" Inherits="CommonFunction.test.ValidateCode" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>WebForm2</title>
<meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1">
<meta name="CODE_LANGUAGE" Content="C#">
<meta name="vs_defaultClientScript" content="JavaScript">
<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
</HEAD>
<body>
<form id="Form1" method="post" runat="server">
<TABLE id="Table1" cellSpacing="1" cellPadding="1" width="300" align="center" border="1">
<TR>
<TD></TD>
<TD align="center">
<asp:Panel id="Panel1" runat="server">Panel</asp:Panel></TD>
<TD></TD>
</TR>
<TR>
<TD></TD>
<TD></TD>
<TD></TD>
</TR>
<TR>
<TD></TD>
<TD></TD>
<TD></TD>
</TR>
</TABLE>
</form>
</body>
</HTML>

对图像解码
FileStream fs =new FileStream(@"..\test.gif",System.IO.FileMode.Create);
BinaryWriter bw=new BinaryWriter(fs);
int readByte=0;
int bytesToRead=100;
byte[] base64Buffer=new byte[bytesToRead];
do
{
readByte= r.ReadBase64(base64Buffer,0,bytesToRead);
bw.Write(base64Buffer,0,readByte);
}while(readByte>=bytesToRead);
bw.Flush();
bw.Close();
刚写的，这样应该可以了吧。

然后<IMG src="CheckCode1.aspx">就可以显示图片拉

看看这个:
//ImgID:上一个页面所传递的图像ID,
//注:上一个页面中的一个gridview列出了数据库中的所有图像,(数据文件为xml文件),
//图像以二进制形式存储于xml文件中.
private void Page_Load(object sender, System.EventArgs e)
{
int ImgID = Convert.ToInt32(Request.QueryString["ID"]); //ID为图片ID
//建立数据库链接
string fileName = Server.MapPath(".\\WriteXml.xml"); //要打开的文件

XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(fileName);
XmlNodeList node = xmlDoc.SelectSingleNode("//Image[ImageID='"+ImgID.ToString()+"']").ChildNodes;
if(node!=null)
{
string strType = node.Item(1).InnerText;
string strData =node.Item(4).InnerText;
int nSize = int.Parse(node.Item(2).InnerText); Response.ContentType = strType;//设定输出文件类型
//输出图象文件二进制数制
Response.OutputStream.Write(Convert.FromBase64String(strData), 0, nSize);
Response.End();
//也可以保存为图像
// FileStream fs = new FileStream(@"C:\aa.BMP", FileMode.OpenOrCreate, FileAccess.Write);
// fs.Write((Convert.FromBase64String(strData), 0,nSize);
// fs.Close();
} }

给你个简单事例:
后台代码:
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;
namespace CommonFunction.test
{
/// <summary>
/// ValitionNO 的摘要说明。
/// </summary>
public class ValidateCode : System.Web.UI.Page
{
protected System.Web.UI.WebControls.Panel Panel1;

private void Page_Load(object sender, System.EventArgs e)
{

if(!this.IsPostBack)
{
this.CreateCheckCodeImage(GenerateCheckCode());
}
}
private string GenerateCheckCode()
{
int number;
char code;
string checkCode = String.Empty; System.Random rd = new Random(); int i=1000 + rd.Next(8999); checkCode =i.ToString(); Response.Cookies.Add(new HttpCookie("CheckCode", checkCode)); return checkCode;
} private void CreateCheckCodeImage(string checkCode)
{
if(checkCode == null || checkCode.Trim() == String.Empty)
return; System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * 12.5)), 22);
Graphics g = Graphics.FromImage(image); try
{
//生成随机生成器
Random random = new Random(); //清空图片背景色
g.Clear(Color.Gainsboro);
//Font font = new Font("Times New Roman",13);
Font font = new System.Drawing.Font("Arial", 12, (System.Drawing.FontStyle.Bold | System.Drawing.FontStyle.Regular));
System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 1.2f, true);
g.DrawString(checkCode, font, brush, 2, 2); //画图片的边框线
g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1); System.IO.MemoryStream ms = new System.IO.MemoryStream();
image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
Response.ClearContent();
Response.ContentType = "image/Gif";
Response.BinaryWrite(ms.ToArray());
}
finally
{
g.Dispose();
image.Dispose();
}
} #region Web 窗体设计器生成的代码
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
//
InitializeComponent();
base.OnInit(e);
}

/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.Load += new System.EventHandler(this.Page_Load); }
#endregion
}
}
HTML代码:
<%@ Page language="c#" Codebehind="CheckCode1.aspx.cs" AutoEventWireup="false" Inherits="CommonFunction.test.ValidateCode" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>WebForm2</title>
<meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1">
<meta name="CODE_LANGUAGE" Content="C#">
<meta name="vs_defaultClientScript" content="JavaScript">
<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
</HEAD>
<body>
<form id="Form1" method="post" runat="server">
<TABLE id="Table1" cellSpacing="1" cellPadding="1" width="300" align="center" border="1">
<TR>
<TD></TD>
<TD align="center">
<asp:Panel id="Panel1" runat="server">Panel</asp:Panel></TD>
<TD></TD>
</TR>
<TR>
<TD></TD>
<TD></TD>
<TD></TD>
</TR>
<TR>
<TD></TD>
<TD></TD>
<TD></TD>
</TR>
</TABLE>
</form>
</body>
</HTML>

能不能就在一个界面上处理完.可以在一个界面处理完。是先把流存储成图片到本地，然后再用<img>显示就行了。

谢谢大家的回贴,其实我的意思是在一个页面中处理,把图片显示出来,但并不是整个页面只输出一张图.,图只是页面的一部分.
1.在多个页面中处理(大概就这各形式(<IMG src="处理图的页面.aspx">)这涉及到页面传参的问题.当前页面(例如说显示图页面.aspx)已经从数据库里得到一个DataTable,怎样把这个DataTable传到处理图的页面.aspx中?
2.把流存储成图片到本地,然后再用<img>显示.这涉及到对文件创建和删除的权限,于及这带来文件命名,文件定时清除等麻烦(例如:当1000个用户并发访问该页面时,要生成1000张图,1000张图文件名要有一个规则生成和删除吧)
===============
再次感谢大家的支持,,希望能有更好的解决方案.

调试易

如何将文本流形式的图片在页面中显示出来?

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