[C#]把文件分割又重写了一遍
最早的是易语言写的，上学期用 VB6 重写了一遍，现在就用 C# 写，写了个 dll，又搞了 CMD 和 UI 两个版本，呵呵 。贴个关键代码吧：
using System;
using System.Text;
using System.IO;
namespace FS
{
public class FileSplitter
{
private enum MSG
{
FILE_NOT_EXIST = 1,
DIR_NOT_EXIST = 2,
BLOCKSIZE_ERROR = 3,
BLOCKSIZE_TOO_LARGE = 4,
BLOCKSIZE_TOO_SMALL = 5,
CAN_NOT_OPEN_FILE = 6,
CAN_NOT_CREATE_FILE = 7,
CAN_NOT_CREATE_CMDFILE = 8
};
private string m_srcPath;
private string m_destDir;
private long m_nBlockSize = 0;
private MSG m_byError = 0;
public FileSplitter(string srcPath)
{
m_srcPath = srcPath;
m_destDir = Path.GetDirectoryName(m_srcPath);
}
public FileSplitter(string srcPath, string destDir)
{
m_srcPath = srcPath;
m_destDir = destDir;
}
public FileSplitter(string srcPath, long nBlockSize)
{
m_srcPath = srcPath;
m_destDir = Path.GetDirectoryName(m_srcPath);
m_nBlockSize = nBlockSize;
}
public FileSplitter(string srcPath, string destDir, long nBlockSize)
{
m_srcPath = srcPath;
m_destDir = destDir;
m_nBlockSize = nBlockSize;
}
public bool SplitFile()
{
if (!File.Exists(m_srcPath))
{
m_byError = MSG.FILE_NOT_EXIST;
return false;
}
if (!Directory.Exists(m_destDir))
{
m_byError = MSG.DIR_NOT_EXIST;
return false;
}
FileInfo fi = new FileInfo(m_srcPath);
if (m_nBlockSize == 0)
{
m_nBlockSize = fi.Length;
}
if (m_nBlockSize <= 0)
{
m_byError = MSG.BLOCKSIZE_ERROR;
return false;
}
if (m_nBlockSize >= fi.Length)
{
m_byError = MSG.BLOCKSIZE_TOO_LARGE;
return false;
}
if (fi.Length / m_nBlockSize > 999)
{
m_byError = MSG.BLOCKSIZE_TOO_SMALL;
return false;
}
FileStream fs_in;
try
{
fs_in = new FileStream(m_srcPath, FileMode.Open);
}
catch
{
m_byError = MSG.CAN_NOT_OPEN_FILE;
return false;
}
long file_rest = fi.Length ;
string temp = "COPY /B ";
int index = 1;
byte[] bytes = new byte[1024];
while (file_rest > 0)
{
string index_ext = "00" + index.ToString();
FileStream fs_out;
try
{
fs_out = new FileStream(m_destDir + "//" + fi.Name + "." + index_ext.Substring(index_ext.Length - 3), FileMode.Create);
}
catch
{
m_byError = MSG.CAN_NOT_CREATE_FILE;
return false;
}
temp += "/"" + fi.Name + "." + index_ext.Substring(index_ext.Length - 3) + "/" + ";
long block_rest;
if(file_rest > m_nBlockSize )
{
block_rest = m_nBlockSize;
}
else
{
block_rest = file_rest;
}
file_rest -= block_rest;
while (block_rest > 0)
{
int count;
if (block_rest > 1024)
{
count = 1024;
}
else
{
count = (int)block_rest;
}
block_rest -=count;
fs_in.Read(bytes, 0, count);
fs_out.Write(bytes, 0, count);
}
fs_out.Close();
index++;
}
temp = temp.Substring(0, temp.Length - 2) + "/"" + fi.Name + "/"";
StreamWriter sw_cmd;
try
{
sw_cmd = new StreamWriter(m_destDir + "//join.cmd", false, Encoding.Default);
}
catch
{
m_byError = MSG.CAN_NOT_CREATE_CMDFILE;
return false;
}
sw_cmd.WriteLine("@echo off");
sw_cmd.WriteLine("cls");
sw_cmd.WriteLine("echo 溪流文件分割 v6.0");
sw_cmd.WriteLine("echo Copyright(C) 1998-2007 溪流软件工作室");
sw_cmd.WriteLine("echo.");
sw_cmd.WriteLine("");
sw_cmd.WriteLine(":CheckFile");
sw_cmd.WriteLine("echo 正在检测文件...");
sw_cmd.WriteLine("echo.");
sw_cmd.WriteLine("IF EXIST /"" + fi.Name + "/" GOTO FileAlreadyExist");
sw_cmd.WriteLine("GOTO JoinFiles");
sw_cmd.WriteLine("");
sw_cmd.WriteLine(":FileAlreadyExist");
sw_cmd.WriteLine("echo “" + fi.Name + "”已经存在，进行合并将覆盖文件。");
sw_cmd.WriteLine("echo 要继续进行合并的话，请将“FileName”改名、");
sw_cmd.WriteLine("echo 转移或删除。");
sw_cmd.WriteLine("GOTO End");
sw_cmd.WriteLine("");
sw_cmd.WriteLine(":JoinFiles");
sw_cmd.WriteLine("echo.");
sw_cmd.WriteLine("echo 正在合并文件...");
sw_cmd.WriteLine(temp);
sw_cmd.WriteLine("echo 成功合并了文件“" + fi.Name + "”。");
sw_cmd.WriteLine("GOTO End");
sw_cmd.WriteLine("");
sw_cmd.WriteLine(":End");
sw_cmd.WriteLine("echo.");
sw_cmd.WriteLine("echo.");
sw_cmd.WriteLine("pause");
sw_cmd.WriteLine("echo on");
sw_cmd.WriteLine("exit");
sw_cmd.Close();
return true;
}
public string GetErrorInfo()
{
switch (m_byError)
{
case MSG.FILE_NOT_EXIST:
return "文件不存在。";
case MSG.DIR_NOT_EXIST:
return "目录不存在。";
case MSG.BLOCKSIZE_ERROR :
return "块大小错误。";
case MSG.BLOCKSIZE_TOO_LARGE :
return "块大小过大，不需要分割。";
case MSG.BLOCKSIZE_TOO_SMALL :
return "块大小过小，分割后将产生多于 1000 个文件，拒绝分割。";
case MSG.CAN_NOT_OPEN_FILE :
return "打开文件失败。";
case MSG.CAN_NOT_CREATE_FILE :
return "创建文件失败。";
case MSG.CAN_NOT_CREATE_CMDFILE:
return "创建命令文件失败。";
default:
return "";
}
}
}
}
（原发表于 CSDN：https://blog.csdn.net/cnStreamlet/article/details/1655902）
