文件比较

2014-10-24 16:19:21 访问(1862) 赞(0) 踩(0)


        /// <summary>
        /// byte比较
        /// </summary>
        /// <param name="one"></param>
        /// <param name="two"></param>
        /// <returns></returns>
        public bool CompareByteArray(byte[] one, byte[] two)
        {
            if (one == null && two == null)
                return true;

            if (one.Length != two.Length)
                return false;

            int iLen = one.Length;

            for (int i = 0; i < iLen; ++i)
            {
                if (one[i] != two[i])
                    return false;
            }

            return true;
        }



        /// <summary>
        /// 比较两个文件是否相同
        /// </summary>
        /// <param name="src"></param>
        /// <param name="desc"></param>
        /// <returns></returns>
        protected string ExcuteFileCompare(string src,string desc)
        {
            FileInfo info = new FileInfo(src);
            FileInfo descInfo = new FileInfo(desc);

            if (!info.Exists)
            {
                return info.FullName + " 文件不存在。";
            }

            if (!descInfo.Exists)
            {
                return descInfo.FullName + " 文件不存在。";
            }

            if (info.Length != descInfo.Length)
            {
                return "文件大小不一致。";
            }

            FileStream sourceFileStream = null;
            FileStream destFileStream = null;
            string tip = "";

            try
            {

                int iSize = 1024;
                int sourceReadCount = 0;
                int destReadCount = 0;
                byte[] sourceBuffer = new byte[iSize];
                byte[] destBuffer = new byte[iSize];

                sourceFileStream = new FileStream(info.FullName, FileMode.Open);

                destFileStream = new FileStream(descInfo.FullName, FileMode.Open);


                if (sourceFileStream.Length != destFileStream.Length)
                {
                    return "文件大小不一致。";
                }


                sourceFileStream.Seek(0, SeekOrigin.Begin);


                while (true)
                {
                    sourceReadCount = sourceFileStream.Read(sourceBuffer, 0, iSize);
                    destReadCount = destFileStream.Read(destBuffer, 0, iSize);


                    if (sourceReadCount != destReadCount)
                    {
                        tip = "文件大小不一致。";
                        break;
                    }

                    if (sourceReadCount == 0)
                        break;

                    // 比较Buffer //
                    if (!CompareByteArray(sourceBuffer, destBuffer))
                    {
                        tip = "不相同。";
                        break;
                    }

                }


                destFileStream.Close();


                sourceFileStream.Close();

            }
            catch (Exception err)
            {
                tip = err.Message;
            }
            finally
            {
                if (sourceFileStream != null)
                    sourceFileStream.Close();

                if (destFileStream != null)
                    destFileStream.Close();
            }

            return tip;

        }

(如果tip==""代表相同，否则就是相应的错误提示）