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你大锅
发表于 2019-6-28 10:43
本帖最后由 你大锅 于 2019-6-28 10:54 编辑
1.首先告诉大家怎么查看文件的MD5码,命令窗口中输入如下命令:
[Asm] 纯文本查看 复制代码 certutil -hashfile 文件名.后缀 MD5
2.原理剖析:
当某个文件的某段数据改变了,哪怕是变了一个字节,那么这个文件的MD5码就会跟着改变,我的做法非常简单,
就是在文件末尾写入一个UUID码,写入UUID码,这样就确保了这个世界上不会存在MD5一样的文件,除非你
把我这个UUID码拿走去生成这个文件.
关键代码:此处我采用的是边读编写,节省内存,读写完之后,我在末尾将UUID转成byte数组添加到流写入流中,已达到修改文件的目的
[C#] 纯文本查看 复制代码 public void CopyToNewFile(string oldFile, string newFile) {
//1、创建一个负责读取的流
using (FileStream fsRead = new FileStream(oldFile, FileMode.Open, FileAccess.Read)) {
//2、创建一个写入流
using (FileStream fsWrite = new FileStream(newFile, FileMode.OpenOrCreate, FileAccess.Write)) {
//3、多媒体文件较大,循环读取
byte[] buffer = new byte[1024 * 1024];
int r = fsRead.Read(buffer, 0, buffer.Length);
while (r != 0) {
fsWrite.Write(buffer, 0, r);//写入
//返回本次读取实际读取到的字节数
r = fsRead.Read(buffer, 0, buffer.Length);
}
//通过往源文件末尾添加uuid二进制数据来改变原文件的MD5值
buffer = Encoding.UTF8.GetBytes(Guid.NewGuid().ToString("N"));
fsWrite.Write(buffer, 0, buffer.Length);
}
}
}
这种方法理论上支持所有的媒体文件,但不支持文本文件,虽然可以照常运行也可以达到修改MD5的目的,但是你文本内容却已经被我改变了
所以如果你要修改的是文本文件的话,那么这种方法 并不可取,如果是媒体文件,那么没毛病!
完整代码:
[C#] 纯文本查看 复制代码 using System;
using System.Data;
using System.Drawing;
using System.IO;
using System.Reflection;
using System.Security.Cryptography;
using System.Text;
using System.Threading;
using System.Windows.Forms;
namespace UpdFileMD5 {
public partial class HomeForm : Form {
private DataTable dt; //表格的数据源
private bool runing; //是否运行,用于停止运行的参数
public HomeForm() {
InitializeComponent();
Init();
}
private void Init() {
openFileDialog1.Multiselect = true;
openFileDialog1.Title = "可以多选(框选)";
//openFileDialog1.Filter = @"(*.jpg,*.png,*.jpeg,*.bmp,*.gif,*.mp4)|*.jgp;*.png;*.jpeg;*.bmp;*.gif;*.mp4|All files(*.*)|*.*";
//初始化表格
dt = new DataTable();
dt.Columns.Add(new DataColumn("文件位置") { DataType = Type.GetType("System.String") });
dt.Columns.Add(new DataColumn("状态"){DataType = Type.GetType("System.String")});
dataGridView1.AllowUserToAddRows = false; //解决用户点击最后一行老是弹出新行的问题
dataGridView1.DataSource = dt;
DoubleBuffered(dataGridView1, true);
dataGridView1.Columns[1].FillWeight = 40;
}
/// <summary>
/// 导入文件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void importFile_button_Click(object sender, EventArgs e) {
if (openFileDialog1.ShowDialog() == DialogResult.OK) {
string[] absPaths = openFileDialog1.FileNames; //绝对路径
foreach (var absPath in absPaths) {
DataRow dr = dt.NewRow();
dr[0] = absPath;
dr[1] = "";
dt.Rows.Add(dr);
}
}
}
/// <summary>
/// 表格序号
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void dataGridView1_RowPostPaint(object sender, DataGridViewRowPostPaintEventArgs e) {
Rectangle rectangle = new Rectangle(e.RowBounds.Location.X, e.RowBounds.Location.Y, dataGridView1.RowHeadersWidth - 4, e.RowBounds.Height);
TextRenderer.DrawText(e.Graphics, (e.RowIndex + 1).ToString(), dataGridView1.RowHeadersDefaultCellStyle.Font, rectangle,
dataGridView1.RowHeadersDefaultCellStyle.ForeColor, TextFormatFlags.VerticalCenter | TextFormatFlags.Right);
}
/// <summary>
/// 解决行头闪烁问题
/// </summary>
/// <param name="dgv"></param>
/// <param name="setting"></param>
private new void DoubleBuffered(DataGridView dgv, bool setting) {
Type dgvType = dgv.GetType();
PropertyInfo pi = dgvType.GetProperty("DoubleBuffered",
BindingFlags.Instance | BindingFlags.NonPublic);
pi.SetValue(dgv, setting, null);
}
/// <summary>
/// 开始执行
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void start_button_Click(object sender, EventArgs e) {
if (folderBrowserDialog1.ShowDialog() == DialogResult.OK){
new Thread(() => {
try{
start_button.Invoke(new MethodInvoker(() => { start_button.Enabled = false; }));
importFile_button.Invoke(new MethodInvoker(() => { importFile_button.Enabled = false; }));
runing = true;
string savePath = folderBrowserDialog1.SelectedPath;
for (int i = 0; i < dt.Rows.Count; i++){
if (!runing){
break;
}
string absPath = dt.Rows[i][0].ToString();
if (!File.Exists(absPath)){
SetLog(i, "文件不存在");
continue;
}
if (!Directory.Exists(savePath)){
SetLog(i, "导出位置错误");
continue;
}
CopyToNewFile(absPath, savePath + @"\new_" + Path.GetFileName(absPath));
SetLog(i, "修改成功");
}
} catch (Exception e2){
MessageBox.Show(e2.Message);
} finally{
start_button.Invoke(new MethodInvoker(() => { start_button.Enabled = true; }));
importFile_button.Invoke(new MethodInvoker(() => { importFile_button.Enabled = true; }));
MessageBox.Show("修改完成");
}
}).Start();
}
}
/// <summary>
/// 设置状态
/// </summary>
/// <param name="index"></param>
/// <param name="msg"></param>
private void SetLog(int index,string msg) {
dataGridView1.Invoke(new MethodInvoker(() => {
dt.Rows[index][1] = msg;
}));
}
/// <summary>
/// ↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓关键代码:修改文件MD5码↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓
/// </summary>
/// <param name="source"></param>
/// <param name="target"></param>
public void CopyToNewFile(string oldFile, string newFile) {
//1、创建一个负责读取的流
using (FileStream fsRead = new FileStream(oldFile, FileMode.Open, FileAccess.Read)) {
//2、创建一个写入流
using (FileStream fsWrite = new FileStream(newFile, FileMode.OpenOrCreate, FileAccess.Write)) {
//3、多媒体文件较大,循环读取
byte[] buffer = new byte[1024 * 1024];
int r = fsRead.Read(buffer, 0, buffer.Length);
while (r != 0) {
fsWrite.Write(buffer, 0, r);//写入
//返回本次读取实际读取到的字节数
r = fsRead.Read(buffer, 0, buffer.Length);
}
//通过往源文件末尾添加uuid二进制数据来改变原文件的MD5值
buffer = Encoding.UTF8.GetBytes(Guid.NewGuid().ToString("N"));
fsWrite.Write(buffer, 0, buffer.Length);
}
}
}
/// <summary>
/// 停止运行
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void stop_button_Click(object sender, EventArgs e) {
runing = false;
}
private void 使用说明ToolStripMenuItem_Click(object sender, EventArgs e) {
HelpForm hp = new HelpForm();
hp.ShowDialog();
}
private void 关于ToolStripMenuItem1_Click(object sender, EventArgs e) {
AboutForm af = new AboutForm();
af.ShowDialog();
}
private void 退出ToolStripMenuItem1_Click(object sender, EventArgs e) {
System.Environment.Exit(0);
}
}
}
-------------------------------------------业务代码都在这里,置于界面的话,自己用VS拖拽一下,控件的(Name)自己改一下就可以了-----------------------------------------------------------
蓝奏: https://www.lanzouj.com/nIDAguomd5tool
链接:https://pan.baidu.com/s/1cKfPp2VMyBYgULW18qU3Fw 提取码:z5q6
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