目录

• 实践过程
• 效果
• 代码

实践过程

效果

代码

复制
public partial class Form : Form
{
    public Form()
    {
        InitializeComponent();
        CheckForIllegalCrossThreadCalls = false;
    }
 
    private void Form_Load(object sender, EventArgs e)
    {
        FileMenu(Application.ExecutablePath + ",", Application.ExecutablePath);
        string[] str = Environment.GetCommandLineArgs();
        try
        {
            string strFile = "";
            for (int i =; i < str.Length; i++)
                strFile += str[i];
            FileInfo FInfo = new FileInfo(strFile);
            if (FInfo.Extension.ToLower() == ".mr")
            {
                textBox.Text = strFile;
                button.Enabled = false;
                button.Enabled = true;
            }
        }
        catch
        {
        }
    }
 
    //选择加密、解密文件
    private void button_Click(object sender, EventArgs e)
    {
        if (openFileDialog.ShowDialog() == DialogResult.OK)
        {
            textBox.Text = openFileDialog1.FileName;
            FileInfo FInfo = new FileInfo(textBox.Text);
            if (FInfo.Extension.ToLower() == ".mr")
            {
                button.Enabled = false;
                button.Enabled = true;
            }
            else
            {
                button.Enabled = true;
                button.Enabled = false;
            }
        }
    }
 
    //加密
    private void button_Click(object sender, EventArgs e)
    {
        if (textBox.Text != "")
        {
            if (textBox.Text.Length < 6)
                MessageBox.Show("密码不能小于位！", "警告", MessageBoxButtons.OK, MessageBoxIcon.Warning);
            else
            {
                EDncrypt myEDncrypt = new EDncrypt(textBox.Text, textBox2.Text, progressBar1);
                myEDncrypt.StartEncrypt();
                progressBar.Value = 0;
            }
        }
    }
 
    //解密
    private void button_Click(object sender, EventArgs e)
    {
        if (textBox.Text != "")
        {
            if (textBox.Text.Length < 6)
                MessageBox.Show("密码不能小于位！", "警告", MessageBoxButtons.OK, MessageBoxIcon.Warning);
            else
            {
                EDncrypt myEDncrypt = new EDncrypt(textBox.Text, textBox2.Text, progressBar1);
                myEDncrypt.StartDncrypt();
                progressBar.Value = 0;
            }
        }
    }
 
    //创建快捷菜单
    public static void FileMenu(string strPath, string strName)
    {
        try
        {
            Registry.ClassesRoot.CreateSubKey(".mr");
            RegistryKey RKey = Registry.ClassesRoot.OpenSubKey(".mr", true);
            RKey.SetValue("", "mrfile");
            RKey.Close();
            Registry.ClassesRoot.CreateSubKey("mrfile");
            RegistryKey RKey = Registry.ClassesRoot.OpenSubKey("mrfile", true);
            RKey.CreateSubKey("DefaultIcon");
            RKey.CreateSubKey("shell");
            RKey.Close();
            RegistryKey RKey = Registry.ClassesRoot.OpenSubKey("mrfile\\DefaultIcon", true);
            RKey.SetValue("", strPath);
            RKey.Close();
            RegistryKey RKey = Registry.ClassesRoot.OpenSubKey("mrfile\\shell", true);
            RKey.CreateSubKey("解密");
            RKey.Close();
            RegistryKey RKey = Registry.ClassesRoot.OpenSubKey("mrfile\\shell\\解密", true);
            RKey.CreateSubKey("command");
            RKey.Close();
            RegistryKey RKey = Registry.ClassesRoot.OpenSubKey("mrfile\\shell\\解密\\command", true);
            RKey.SetValue("", strName + " \\F %1");
            RKey.Close();
        }
        catch
        {
        }
    }
}
 
#region 加密、解密类
 
class EDncrypt
{
    #region 定义全局变量及类对象
 
    private string strFile = "";
    private string strNewFile = "";
    private string strPwd = "";
    private ProgressBar PBar = null;
    private Thread EThread = null;
    private Thread DThread = null;
 
    #endregion
 
    //含参数的构造函数，用来初始化全局变量及对象
    public EDncrypt(string name, string pwd, ProgressBar pb)
    {
        strFile = name;
        strPwd = pwd;
        PBar = pb;
        EThread = new Thread(new ThreadStart(this.myEThread));
        DThread = new Thread(new ThreadStart(this.myDThread));
    }
 
    //文件加密
    private void myEThread()
    {
        byte[] btRKey = new byte[];
        if (strPwd.Length ==)
        {
            btRKey = new byte[]
            {
                (byte) strPwd[], (byte) strPwd[1], (byte) strPwd[2], (byte) strPwd[3], (byte) strPwd[4],
                (byte) strPwd[], (byte) strPwd[0], (byte) strPwd[1]
            };
        }
 
        if (strPwd.Length ==)
        {
            btRKey = new byte[]
            {
                (byte) strPwd[], (byte) strPwd[1], (byte) strPwd[2], (byte) strPwd[3], (byte) strPwd[4],
                (byte) strPwd[], (byte) strPwd[6], (byte) strPwd[0]
            };
        }
 
        if (strPwd.Length >=)
        {
            btRKey = new byte[]
            {
                (byte) strPwd[], (byte) strPwd[1], (byte) strPwd[2], (byte) strPwd[3], (byte) strPwd[4],
                (byte) strPwd[], (byte) strPwd[6], (byte) strPwd[7]
            };
        }
 
        FileStream FStream = new FileStream(strFile, FileMode.Open, FileAccess.Read);
        FileStream NewFStream = new FileStream(strFile + ".mr", FileMode.OpenOrCreate, FileAccess.Write);
        NewFStream.SetLength((long));
        byte[] buffer = new byte[x400];
        int MinNum =;
        long length = FStream.Length;
        int MaxNum = (int) (length / ((long)x400));
        PBar.Maximum = MaxNum;
        DES myDES = new DESCryptoServiceProvider();
        CryptoStream CStream =
            new CryptoStream(NewFStream, myDES.CreateEncryptor(btRKey, btRKey), CryptoStreamMode.Write);
        while (MinNum < length)
        {
            int count = FStream.Read(buffer,, 0x400);
            CStream.Write(buffer,, count);
            MinNum += count;
            try
            {
                if (PBar.Value < PBar.Maximum)
                {
                    PBar.Value++;
                }
            }
            catch
            {
            }
        }
 
        CStream.Close();
        NewFStream.Close();
        FStream.Close();
        File.Delete(strFile);
        MessageBox.Show("文件加密成功！", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
    }
 
    //运行加密线程
    public void StartEncrypt()
    {
        EThread.Start();
    }
 
    //文件解密
    private void myDThread()
    {
        FileStream FStream = null;
        FileStream NewFStream = null;
        CryptoStream CStream = null;
        try
        {
            try
            {
                byte[] btRKey = new byte[];
                if (strPwd.Length ==)
                {
                    btRKey = new byte[]
                    {
                        (byte) strPwd[], (byte) strPwd[1], (byte) strPwd[2], (byte) strPwd[3], (byte) strPwd[4],
                        (byte) strPwd[], (byte) strPwd[0], (byte) strPwd[1]
                    };
                }
 
                if (strPwd.Length ==)
                {
                    btRKey = new byte[]
                    {
                        (byte) strPwd[], (byte) strPwd[1], (byte) strPwd[2], (byte) strPwd[3], (byte) strPwd[4],
                        (byte) strPwd[], (byte) strPwd[6], (byte) strPwd[0]
                    };
                }
 
                if (strPwd.Length >=)
                {
                    btRKey = new byte[]
                    {
                        (byte) strPwd[], (byte) strPwd[1], (byte) strPwd[2], (byte) strPwd[3], (byte) strPwd[4],
                        (byte) strPwd[], (byte) strPwd[6], (byte) strPwd[7]
                    };
                }
 
                FStream = new FileStream(strFile, FileMode.Open, FileAccess.Read);
                strNewFile = strFile.Substring(, strFile.Length - 3);
                NewFStream = new FileStream(strNewFile, FileMode.OpenOrCreate, FileAccess.Write);
                NewFStream.SetLength((long));
                byte[] buffer = new byte[x400];
                int MinNum =;
                long length = FStream.Length;
                int MaxNum = (int) (length / ((long)x400));
                PBar.Maximum = MaxNum;
                DES myDES = new DESCryptoServiceProvider();
                CStream = new CryptoStream(NewFStream, myDES.CreateDecryptor(btRKey, btRKey),
                    CryptoStreamMode.Write);
                while (MinNum < length)
                {
                    int count = FStream.Read(buffer,, 0x400);
                    CStream.Write(buffer,, count);
                    MinNum += count;
                    try
                    {
                        if (PBar.Value < PBar.Maximum)
                        {
                            PBar.Value++;
                        }
                    }
                    catch
                    {
                    }
                }
 
                MessageBox.Show("文件解密成功！", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
            catch
            {
                MessageBox.Show("文件解密失败！", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }
        finally
        {
            CStream.Close();
            FStream.Close();
            NewFStream.Close();
        }
    }
 
    //运行解密线程
    public void StartDncrypt()
    {
        DThread.Start();
    }
}
 
#endregion
partial class Form
{
    /// <summary>
    /// 必需的设计器变量。
    /// </summary>
    private System.ComponentModel.IContainer components = null;
 
    /// <summary>
    /// 清理所有正在使用的资源。
    /// </summary>
    /// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>
    protected override void Dispose(bool disposing)
    {
        if (disposing && (components != null))
        {
            components.Dispose();
        }
        base.Dispose(disposing);
    }
 
    #region Windows 窗体设计器生成的代码
 
    /// <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.label = new System.Windows.Forms.Label();
        this.textBox = new System.Windows.Forms.TextBox();
        this.button = new System.Windows.Forms.Button();
        this.label = new System.Windows.Forms.Label();
        this.textBox = new System.Windows.Forms.TextBox();
        this.label = new System.Windows.Forms.Label();
        this.label = new System.Windows.Forms.Label();
        this.progressBar = new System.Windows.Forms.ProgressBar();
        this.groupBox = new System.Windows.Forms.GroupBox();
        this.button = new System.Windows.Forms.Button();
        this.button = new System.Windows.Forms.Button();
        this.openFileDialog = new System.Windows.Forms.OpenFileDialog();
        this.groupBox.SuspendLayout();
        this.SuspendLayout();
        // 
        // label
        // 
        this.label.AutoSize = true;
        this.label.Location = new System.Drawing.Point(6, 17);
        this.label.Name = "label1";
        this.label.Size = new System.Drawing.Size(161, 12);
        this.label.TabIndex = 0;
        this.label.Text = "请选择要加密或解密的文件：";
        // 
        // textBox
        // 
        this.textBox.Location = new System.Drawing.Point(32, 35);
        this.textBox.Name = "textBox1";
        this.textBox.Size = new System.Drawing.Size(263, 21);
        this.textBox.TabIndex = 1;
        // 
        // button
        // 
        this.button.Location = new System.Drawing.Point(301, 33);
        this.button.Name = "button1";
        this.button.Size = new System.Drawing.Size(33, 23);
        this.button.TabIndex = 2;
        this.button.Text = "…";
        this.button.UseVisualStyleBackColor = true;
        this.button.Click += new System.EventHandler(this.button1_Click);
        // 
        // label
        // 
        this.label.AutoSize = true;
        this.label.Location = new System.Drawing.Point(7, 71);
        this.label.Name = "label2";
        this.label.Size = new System.Drawing.Size(83, 12);
        this.label.TabIndex = 3;
        this.label.Text = "加/解密密码：";
        // 
        // textBox
        // 
        this.textBox.Location = new System.Drawing.Point(92, 68);
        this.textBox.Name = "textBox2";
        this.textBox.PasswordChar = '*';
        this.textBox.Size = new System.Drawing.Size(151, 21);
        this.textBox.TabIndex = 4;
        // 
        // label
        // 
        this.label.AutoSize = true;
        this.label.ForeColor = System.Drawing.Color.Red;
        this.label.Location = new System.Drawing.Point(243, 71);
        this.label.Name = "label3";
        this.label.Size = new System.Drawing.Size(95, 12);
        this.label.TabIndex = 5;
        this.label.Text = "(密码应大于6位)";
        // 
        // label
        // 
        this.label.AutoSize = true;
        this.label.Location = new System.Drawing.Point(7, 101);
        this.label.Name = "label4";
        this.label.Size = new System.Drawing.Size(83, 12);
        this.label.TabIndex = 6;
        this.label.Text = "加/解密进度：";
        // 
        // progressBar
        // 
        this.progressBar.Location = new System.Drawing.Point(92, 99);
        this.progressBar.Name = "progressBar1";
        this.progressBar.Size = new System.Drawing.Size(242, 18);
        this.progressBar.TabIndex = 7;
        // 
        // groupBox
        // 
        this.groupBox.Controls.Add(this.label1);
        this.groupBox.Controls.Add(this.progressBar1);
        this.groupBox.Controls.Add(this.textBox1);
        this.groupBox.Controls.Add(this.label4);
        this.groupBox.Controls.Add(this.button1);
        this.groupBox.Controls.Add(this.label3);
        this.groupBox.Controls.Add(this.label2);
        this.groupBox.Controls.Add(this.textBox2);
        this.groupBox.Location = new System.Drawing.Point(5, 5);
        this.groupBox.Name = "groupBox1";
        this.groupBox.Size = new System.Drawing.Size(342, 123);
        this.groupBox.TabIndex = 8;
        this.groupBox.TabStop = false;
        this.groupBox.Text = "文件加/解密设置";
        // 
        // button
        // 
        this.button.Enabled = false;
        this.button.Location = new System.Drawing.Point(223, 134);
        this.button.Name = "button2";
        this.button.Size = new System.Drawing.Size(59, 27);
        this.button.TabIndex = 9;
        this.button.Text = "加密";
        this.button.UseVisualStyleBackColor = true;
        this.button.Click += new System.EventHandler(this.button2_Click);
        // 
        // button
        // 
        this.button.Enabled = false;
        this.button.Location = new System.Drawing.Point(288, 134);
        this.button.Name = "button3";
        this.button.Size = new System.Drawing.Size(59, 27);
        this.button.TabIndex = 9;
        this.button.Text = "解密";
        this.button.UseVisualStyleBackColor = true;
        this.button.Click += new System.EventHandler(this.button3_Click);
        // 
        // openFileDialog
        // 
        this.openFileDialog.FileName = "openFileDialog1";
        // 
        // Form
        // 
        this.AutoScaleDimensions = new System.Drawing.SizeF(F, 12F);
        this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
        this.ClientSize = new System.Drawing.Size(, 167);
        this.Controls.Add(this.button);
        this.Controls.Add(this.button);
        this.Controls.Add(this.groupBox);
        this.MaximizeBox = false;
        this.Name = "Form";
        this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
        this.Text = "对文件进行加密保护";
        this.Load += new System.EventHandler(this.Form_Load);
        this.groupBox.ResumeLayout(false);
        this.groupBox.PerformLayout();
        this.ResumeLayout(false);
 
    }
 
    #endregion
 
    private System.Windows.Forms.Label label;
    private System.Windows.Forms.TextBox textBox;
    private System.Windows.Forms.Button button;
    private System.Windows.Forms.Label label;
    private System.Windows.Forms.TextBox textBox;
    private System.Windows.Forms.Label label;
    private System.Windows.Forms.Label label;
    private System.Windows.Forms.ProgressBar progressBar;
    private System.Windows.Forms.GroupBox groupBox;
    private System.Windows.Forms.Button button;
    private System.Windows.Forms.Button button;
    private System.Windows.Forms.OpenFileDialog openFileDialog;
}