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using System;
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using System.Collections.Generic;
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using System.Drawing;
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using System.IO;
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using System.Linq;
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namespace WMS.Untils
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{
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/// <summary>
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/// 文件帮助
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/// </summary>
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public class FileHelper
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{
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private static char[] base64CodeArray = new char[]
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{
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'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
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'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
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'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/', '='
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};
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/// <summary>
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/// 判断一个文件是否是图片
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/// </summary>
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/// <param name="name"></param>
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/// <returns></returns>
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public static bool IsImage(string name)
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{
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var extension = Path.GetExtension(name).ToLower();
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var imageExtensions = new List<string> { ".jpg", ".png", ".ico", ".tif", ".bmp", ".gif" };
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return imageExtensions.Contains(extension);
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}
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/// <summary>
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/// 判断一个文件是否为pdf文件
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/// </summary>
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/// <param name="name"></param>
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/// <returns></returns>
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public static bool IsPdf(string name)
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{
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var extension = Path.GetExtension(name).ToLower();
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var pdfExtensions = new List<string> { ".pdf" };
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return pdfExtensions.Contains(extension);
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}
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/// <summary>
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/// 将指定路径下的文件转为byte数组
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/// </summary>
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/// <param name="path">指定路径</param>
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/// <returns></returns>
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public static byte[] GetBytesByFile(string path)
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{
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try
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{
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if (!File.Exists(path))
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{
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return new byte[0];
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}
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var fileInfo = new FileInfo(path);
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byte[] buff = new byte[fileInfo.Length];
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var fileStream = fileInfo.OpenRead();
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fileStream.Read(buff, 0, int.Parse(fileStream.Length.ToString()));
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fileStream.Close();
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return buff;
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}
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catch (Exception ex)
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{
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return new byte[0];
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}
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}
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/// <summary>
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/// 将指定路径下的图片转成base64字符串
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/// </summary>
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/// <param name="path"></param>
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/// <returns></returns>
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public static string GetBase64Str(string path)
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{
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try
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{
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using (MemoryStream ms1 = new MemoryStream())
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{
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var bmp1 = new Bitmap(path);
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bmp1.Save(ms1, System.Drawing.Imaging.ImageFormat.Jpeg);
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byte[] arr1 = new byte[ms1.Length];
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ms1.Position = 0;
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ms1.Read(arr1, 0, (int)ms1.Length);
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ms1.Close();
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bmp1.Dispose();
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return Convert.ToBase64String(arr1);
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}
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}
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catch (Exception ex)
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{
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return null;
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}
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}
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public static string GetBase64Str(Bitmap bitMap)
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{
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try
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{
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using (MemoryStream ms1 = new MemoryStream())
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{
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bitMap.Save(ms1, System.Drawing.Imaging.ImageFormat.Jpeg);
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byte[] arr1 = new byte[ms1.Length];
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ms1.Position = 0;
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ms1.Read(arr1, 0, (int)ms1.Length);
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ms1.Close();
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return Convert.ToBase64String(arr1);
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}
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}
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catch (Exception ex)
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{
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return null;
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}
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}
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/// <summary>
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/// 是否base64字符串
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/// </summary>
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/// <param name="base64Str">要判断的字符串</param>
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/// <param name="bytes">字符串转换成的字节数组</param>
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/// <returns></returns>
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public static bool IsBase64(string base64Str, out byte[] bytes)
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{
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//string strRegex = "^([A-Za-z0-9+/]{4})*([A-Za-z0-9+/]{4}|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{2}==)$";
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bytes = null;
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if (string.IsNullOrEmpty(base64Str))
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return false;
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else
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{
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if (base64Str.Contains(","))
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base64Str = base64Str.Split(',')[1];
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if (base64Str.Length % 4 != 0)
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return false;
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if (base64Str.Any(c => !base64CodeArray.Contains(c)))
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return false;
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}
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try
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{
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bytes = Convert.FromBase64String(base64Str);
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return true;
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}
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catch (FormatException)
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{
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return false;
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}
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}
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/// <summary>
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/// 把base64字符串转换成Bitmap
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/// </summary>
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/// <param name="base64Str">要转换的base64字符串</param>
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/// <returns></returns>
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public static Bitmap Base64ToBitmap(string base64Str)
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{
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Bitmap bitmap = null;
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byte[] bytes = null;
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try
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{
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if (IsBase64(base64Str, out bytes))
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{
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using (MemoryStream stream = new MemoryStream(bytes))
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{
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stream.Seek(0, SeekOrigin.Begin);//为了避免有时候流指针定位错误，显式定义一下指针位置
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bitmap = new Bitmap(stream);
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}
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}
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}
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catch (Exception)
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{
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bitmap = null;
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}
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return bitmap;
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}
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/// <summary>
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/// 删除文件夹strDir中nDays天以前的文件
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/// </summary>
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/// <param name="dir"></param>
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/// <param name="days"></param>
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public static void DeleteOldFiles(string dir, int days)
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{
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try
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{
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if (!Directory.Exists(dir) || days < 1) return;
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var now = DateTime.Now;
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foreach (var f in Directory.GetFileSystemEntries(dir).Where(f => File.Exists(f)))
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{
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var t = File.GetCreationTime(f);
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var elapsedTicks = now.Ticks - t.Ticks;
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var elapsedSpan = new TimeSpan(elapsedTicks);
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if (elapsedSpan.TotalDays > days) File.Delete(f);
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}
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}
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catch (Exception)
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{
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// ignored
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}
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}
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}
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}
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