文件流

1，FileInfo类
类库定义对象File(静态方法类)
定义：dim fi as FileInfo
创建：fi = new FileInfo("strpath")
文件存在否：fi.exists
删除文件：fi.delete
返回流文件：fsm = fi.create();fsm = fi.open();fsm = fi.openwrite();fsm = fi.openread();
返回写流：smw = fi.appendtext();smw = fi.createtext();
返回读流：smr = fi.opentext();

2，FileStream类
定义：dim fsm as FileStream
创建：fsm = new FileStream("strpath")
存入基础设备：fsm.flush
使用结束：fsm.close
添加文本：AddText(fs, "This is some text")
读取文本：
        Dim b(1024) As Byte
        Dim temp As UTF8Encoding = New UTF8Encoding(True)
        Do While fs.Read(b, 0, b.Length) > 0
          Console.WriteLine(temp.GetString(b))
        loop

3，StreamReader类
定义：dim smr as StreamReader
创建：smr = new StreamReader("strpath")
指向头：smr.basestream.seek(0,seekorigin.begin)
后移：smr.peek()
读字符：smr.read(str, 0, 1)
读行：smr.readline
读全文：smr.readToEnd()
使用结束：smr.close()

4，StreamWriter类
定义：dim smw as StreamWriter
创建：smw = StreamWriter("strpath")；
写入字符：smw.write("achar")
写入行：smw.writeline("str")
存入磁盘…………

================================================================

using System;
using System.IO;
namespace csdn
{
class Class1
{
[STAThread]
static void Main(string[] args)
{
int sz;
FileStream s=new FileStream(@"劳斯来斯2.jpg",FileMode.OpenOrCreate,FileAccess.Read);
sz=Convert.ToInt32(s.Length);
byte[] k=new byte[sz];
s.Read(k,0,sz);
s.Close();
FileStream x=new FileStream(@"f:\1.jpg",FileMode.Create,FileAccess.Write);
x.Write(k,0,sz);
x.Close();
}
}
}

========================================================

StreamReader reader=StreamReader(@"c:\text.txt");
string strReader=reader.ReadToEnd();
reader.Close();

ii += strReader;

=====================================

使用binarywriter写字符串，它会默认在字符串后面加 "\0"，由实际的10个字节变为11个字节。建议直接写如byte数组。

int i = 10245679;
string str = t.ToString( "0000000000" );

byte[] buffer = System.Text.Encoding.Default.GetBytes( str );

FileStream fs = new FileStream( fileName , FileMode.Open , FileAccess.ReadAndWrite );
fs.Seek( 0 , SeekOrigin.End );        //当前fs的position再其文件末尾
fs.Write( buffer , 0 , buffer.Length ); //写入byte数组
fs.Close();

----------------------------------

读取：
FileStream fs = new FileStream( fileName , FileMode.Open , FileAccess.ReadAndWrite );
fs.Seek( -10 , SeekOrigin.End );         
byte[] buffer = new byte[ 10 ];
fs.Read( buffer , 0 , 10 );
fs.Close();

string str = Encoding.Defauult.GetString( buffer );

=====================================================

/// <summary>
/// 同步票号
/// </summary>

  private void ProWriteTxt()
  {
   
   string strLocalFileName=Directory.GetCurrentDirectory() + @"\baseinfo.txt";
   string strInfo="";
   StreamReader  sr=new StreamReader((System.IO.Stream)File.OpenRead(strLocalFileName),System.Text.ASCIIEncoding.UTF8 )  ;
   strInfo=sr.ReadLine(); 
   sr.Close();
   string[] strSubInfo=strInfo.Split('#');//读过程
  
   strSubInfo[3]=this.lblPh.Text.ToString();//修改过程
   strInfo = strSubInfo[0]+"#"+strSubInfo[1]+"#"+strSubInfo[2]+"#"+strSubInfo[3]+"#"+strSubInfo[4]+"#"+strSubInfo[5]+"#"+strSubInfo[6]+"#"+strSubInfo[7];
   FileStream fs=new FileStream(strLocalFileName,FileMode.Truncate,FileAccess.Write);
   StreamWriter sw=new StreamWriter(fs);
   
   sw.WriteLine(strInfo);
   sw.Close();
   fs.Close();
  
  }
我是用#分割的。