C#的输入输出流

Access可以是以下当中的一个值:

　　FileAccess.Read/  FileAccess.Write/  FileAccess.ReadWrite;

　　FileStreamfs=new FileStream(“c://tab.txt”,FileMode.OpenOrCreate,FileAccess.Read);

C#中结合Post发送的Stream与Byte Array的操作似乎资料很少.下面是我这几天的研究成果.功能是将同文件夹下的a.jpg复制生成b.jpg.代码如下:

byteArray.aspx.cs

using System;

using System.IO;

using System.Data;

using System.Drawing;

using System.Drawing.Imaging;

using System.Net;

/*@

Author:frank

Site:www.2solo.cn

Date:2008.02.20

Info:C#复制图片,流与byteArray的应用,生成图片部分

*/

namespace bArray {

   public partial class imgHandler : System.Web.UI.Page 
     { 
        protected void Page_Load(object sender, EventArgs e) 
         { 
            try 
            { 
                Stream sin = Page.Request.InputStream; 
                System.Drawing.Image img = System.Drawing.Bitmap.FromStream(sin); 
                Bitmap bmp = new Bitmap(img); 
                MemoryStream bmpStream = new MemoryStream(); 
                bmp.Save(bmpStream, System.Drawing.Imaging.ImageFormat.Jpeg); 
                FileStream fs = new FileStream(System.Web.HttpContext.Current.Server.MapPath("b.jpg"), FileMode.Create); 
                bmpStream.WriteTo(fs); 
                bmpStream.Close(); 
                fs.Close(); 
                bmpStream.Dispose(); 
                fs.Dispose(); 
                Response.Write("成功"); 
            } 
            catch 
            { 
                Response.Write("失败"); 
            } 
        } 
    } 
}

 

gopost.aspx.cs

using System;

using System.IO;

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

using System.Net; 
using System.Text; 
/*@ 
Author:frank

Site:www.2solo.cn 
Date:2008.02.20

info:C#复制图片,流与byteArray的应用,提交图片部分 
*/ 
namespace gopost

{ 
    public partial class postHandler : System.Web.UI.Page 
    { 
       protected void Page_Load(object sender, EventArgs e) 
        {

           postImage(); 
        }

       private void postImage()

        { 
            try 
            { 
                HttpWebRequest request; 
                string imgUrl = System.Web.HttpContext.Current.Server.MapPath("a.jpg"); 
                request = (HttpWebRequest)HttpWebRequest.Create(http://localhost/byteArray/byteArray.aspx); 
                request.KeepAlive = true; 
                request.Method = "POST"; 
                byte[] byteArray = CvtImgBArr((System.Drawing.Image)new Bitmap(@imgUrl), ImageFormat.Jpeg); 
                request.ContentType = "image/JPEG"; 
                request.ContentLength = byteArray.Length;
                Stream newStream = request.GetRequestStream();
                newStream.Write(byteArray, 0, byteArray.Length); 
                newStream.Close(); 
                Response.Write("复制图片成功"); 
            } 
            catch 
            {

                Response.Write("复制图片失败"); 
            }

        }


        private static byte[] CvtImgBArr(System.Drawing.Image imageToConvert, ImageFormat formatOfImage)

        {

            byte[] imArr; 
            try 
            { 
                using (MemoryStream myms = new MemoryStream()) 
                {

                    imageToConvert.Save(myms, formatOfImage);

                    imArr = myms.ToArray(); 
                } 
            }

            catch (Exception) { throw; } 
            return imArr; 
        }

    } 
}

C# Stream 和 byte[] 之间的转换
 

/* - - - - - - - - - - - - - - - - - - - - - - - -  
 * Stream 和 byte[] 之间的转换 
 * - - - - - - - - - - - - - - - - - - - - - - - */ 
/// <summary> 
/// 将 Stream 转成 byte[] 
/// </summary> 
public byte[] StreamToBytes(Stream stream) 
{ 
    byte[] bytes = new byte[stream.Length]; 
    stream.Read(bytes, 0, bytes.Length); 
    // 设置当前流的位置为流的开始 
    stream.Seek(0, SeekOrigin.Begin); 
    return bytes; 
} 
/// <summary> 
/// 将 byte[] 转成 Stream 
/// </summary> 
public Stream BytesToStream(byte[] bytes) 
{ 
    Stream stream = new MemoryStream(bytes); 
    return stream; 
} 

/* - - - - - - - - - - - - - - - - - - - - - - - -  
 * Stream 和 文件之间的转换 
 * - - - - - - - - - - - - - - - - - - - - - - - */ 
/// <summary> 
/// 将 Stream 写入文件 
/// </summary> 
public void StreamToFile(Stream stream,string fileName) 
{ 
    // 把 Stream 转换成 byte[] 
    byte[] bytes = new byte[stream.Length]; 
    stream.Read(bytes, 0, bytes.Length); 
    // 设置当前流的位置为流的开始 
    stream.Seek(0, SeekOrigin.Begin); 
    // 把 byte[] 写入文件 
    FileStream fs = new FileStream(fileName, FileMode.Create); 
    BinaryWriter bw = new BinaryWriter(fs); 
    bw.Write(bytes); 
    bw.Close(); 
    fs.Close(); 
} 
/// <summary> 
/// 从文件读取 Stream 
/// </summary> 
public Stream FileToStream(string fileName) 
{             
    // 打开文件 
    FileStream fileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read); 
    // 读取文件的 byte[] 
    byte[] bytes = new byte[fileStream.Length]; 
    fileStream.Read(bytes, 0, bytes.Length); 
    fileStream.Close(); 
    // 把 byte[] 转换成 Stream 
    Stream stream = new MemoryStream(bytes); 
    return stream; 
} 
另外，XML的一个应用是序列化，要用到把字符串转化成byte数组，方法：
     byte[] bytes = System.Text.UTF8Encoding.UTF8.GetBytes(XmlContent); 
相对的，把byte数组转化为字符串的方法则为：
　　string XmlContent = System.Text.UTFEncoding.UTF8.GetString(bytes);

从字符串到流Stream

byte[] buffer = System.Text.Encoding.Unicode.GetBytes("faint"); 
MemoryStream stream = new MemoryStream(buffer);

MemoryStream ms = new MemoryStream(System.Text.Encoding.Default.GetBytes(AObjStr));