c#實現(xiàn)拖拽打開方法.doc

首先，這是個winform的程序，部署在市場部同事的筆記本上面，基于.Net 2.0做的，它的功能大致如下： 加密合同文檔（*.doc） 在客戶處解密此合同文檔，進行編輯，再次加密 回到公司可以通過密碼打開它由于時間關(guān)系，只是很粗略的做了個大概。打開vs2008，建立一個winform項目，設(shè)計程序界面如下：很簡單的，待會兒在文章最后會有下載地址。我們可以把任意文件，拖入程序界面，即可進行加密，在此暫不作說明，大家可以待會兒下載回去試試，很簡單的。下面分享一下加密代碼吧：代碼 using System;using System.Collections.Generic;using System.Text;using System.Security.Cryptography;using System.IO;namespace FileLock / / 異常處理類 / public class CryptoHelpException : ApplicationException public CryptoHelpException(string msg) : base(msg) public class CryptoHelp private const ulong FC_TAG = 0xFC010203040506CF; private const int BUFFER_SIZE = 128 * 1024; / / 檢驗兩個Byte數(shù)組是否相同 / / Byte數(shù)組 / Byte數(shù)組 / true相等 private static bool CheckByteArrays(byte b1, byte b2) if (b1.Length = b2.Length) for (int i = 0; i b1.Length; +i) if (b1i != b2i) return false; return true; return false; / / 創(chuàng)建Rijndael SymmetricAlgorithm / / 密碼 / / 加密對象 private static SymmetricAlgorithm CreateRijndael(string password, byte salt) PasswordDeriveBytes pdb = new PasswordDeriveBytes(password, salt, SHA256, 1000); SymmetricAlgorithm sma = Rijndael.Create(); sma.KeySize = 256; sma.Key = pdb.GetBytes(32); sma.Padding = PaddingMode.PKCS7; return sma; / / 加密文件隨機數(shù)生成 / private static RandomNumberGenerator rand = new RNGCryptoServiceProvider(); / / 生成指定長度的隨機Byte數(shù)組 / / Byte數(shù)組長度 / 隨機Byte數(shù)組 private static byte GenerateRandomBytes(int count) byte bytes = new bytecount; rand.GetBytes(bytes); return bytes; / / 加密文件 / / 待加密文件 / 加密后輸入文件 / 加密密碼 public static void EncryptFile(string inFile, string outFile, string password) using (FileStream fin = File.OpenRead(inFile), fout = File.OpenWrite(outFile) long lSize = fin.Length; / 輸入文件長度 int size = (int)lSize; byte bytes = new byteBUFFER_SIZE; / 緩存 int read = -1; / 輸入文件讀取數(shù)量 int value = 0; / 獲取IV和salt byte IV = GenerateRandomBytes(16); byte salt = GenerateRandomBytes(16); / 創(chuàng)建加密對象 SymmetricAlgorithm sma = CryptoHelp.CreateRijndael(password, salt); sma.IV = IV; / 在輸出文件開始部分寫入IV和salt fout.Write(IV, 0, IV.Length); fout.Write(salt, 0, salt.Length); / 創(chuàng)建散列加密 HashAlgorithm hasher = SHA256.Create(); using (CryptoStream cout = new CryptoStream(fout, sma.CreateEncryptor(), CryptoStreamMode.Write), chash = new CryptoStream(Stream.Null, hasher, CryptoStreamMode.Write) BinaryWriter bw = new BinaryWriter(cout); bw.Write(lSize); bw.Write(FC_TAG); / 讀寫字節(jié)塊到加密流緩沖區(qū) while (read = fin.Read(bytes, 0, bytes.Length) != 0) cout.Write(bytes, 0, read); chash.Write(bytes, 0, read); value += read; / 關(guān)閉加密流 chash.Flush(); chash.Close(); / 讀取散列 byte hash = hasher.Hash; / 輸入文件寫入散列 cout.Write(hash, 0, hash.Length); / 關(guān)閉文件流 cout.Flush(); cout.Close(); / / 解密文件 / / 待解密文件 / 解密后輸出文件 / 解密密碼 public static void DecryptFile(string inFile, string outFile, string password) / 創(chuàng)建打開文件流 using (FileStream fin = File.OpenRead(inFile), fout = File.OpenWrite(outFile) int size = (int)fin.Length; byte bytes = new byteBUFFER_SIZE; int read = -1; int value = 0; int outValue = 0; byte IV = new byte16; fin.Read(IV, 0, 16); byte salt = new byte16; fin.Read(salt, 0, 16); SymmetricAlgorithm sma = CryptoHelp.CreateRijndael(password, salt); sma.IV = IV; value = 32; long lSize = -1; / 創(chuàng)建散列對象, 校驗文件 HashAlgorithm hasher = SHA256.Create(); /using (CryptoStream cin = new CryptoStream(fin, sma.CreateDecryptor(), CryptoStreamMode.Read), / chash = new CryptoStream(Stream.Null, hasher, CryptoStreamMode.Write) / CryptoStream cin = new CryptoStream(fin, sma.CreateDecryptor(), CryptoStreamMode.Read), chash = new CryptoStream(Stream.Null, hasher, CryptoStreamMode.Write); / 讀取文件長度 BinaryReader br = new BinaryReader(cin); lSize = br.ReadInt64(); ulong tag = br.ReadUInt64(); if (FC_TAG != tag) throw new CryptoHelpException(文件被破壞或者密碼不正確); long numReads = lSize / BUFFER_SIZE; long slack = (long)lSize % BUFFER_SIZE; for (int i = 0; i 0) read = cin.Read(bytes, 0, (int)slack); fout.Write(bytes, 0, read); chash.Write(bytes, 0, read); value += read; outValue += read; chash.Flush(); chash.Close(); fout.Flush(); fout.Close(); byte curHash = hasher.Hash; / 獲取比較和舊的散列對象 byte oldHash = new bytehasher.HashSize / 8; read = cin.Read(oldHash, 0, oldHash.Length); if (oldHash.Length != read) | (!CheckByteArrays(oldHash, curHash) throw new CryptoHelpException(文件被破壞); cin.Flush(); cin.Close(); / if (outValue != lSize) throw new CryptoHelpException(文件大小不匹配); 是不是很明了呢？當(dāng)然了，網(wǎng)上一搜一大把，我這個也是不小心搜到的，感覺比較不錯的代碼，后來經(jīng)過我少許加工，即可使用了。當(dāng)然，在這里，還要提一句，這個小程序，為了讓它更方便，直接拖拽文件到其圖標之上，就默認打開程序，加載該文件，并進行加密操作，聽起來是不是很cool!?呵呵，下面再和大家分享一下如何實現(xiàn)吧：在窗體的DragDrop和DragEnter事件下，添加如下代碼：代碼 private void MainForm_DragEnter(object sender, DragEventArgs e) if (e.Data.GetDataPresent(DataFormats.FileDrop) e.Effect = DragDropEffects.Move; else e.Effect = DragDropEffects.None; private void MainForm_DragDrop(object sender, DragEventArgs e) string path = (System.Array)e.Data.GetData(DataFormats.FileDrop).GetValue(0).ToString(); extension = System.IO.Path.GetExtension(path);/擴展名 if (e