|
using iWareCommon.Properties;
|
using System;
|
using System.Collections.Generic;
|
using System.Drawing;
|
using System.IO;
|
using System.Linq;
|
namespace iWareCommon.Utils
|
{
|
/// <summary>
|
/// 文件帮助
|
/// </summary>
|
public class FileHelper
|
{
|
private static char[] base64CodeArray = new char[]
|
{
|
'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',
|
'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',
|
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/', '='
|
};
|
|
|
|
|
/// <summary>
|
/// 判断一个文件是否是图片
|
/// </summary>
|
/// <param name="name"></param>
|
/// <returns></returns>
|
public static bool IsImage(string name)
|
{
|
var extension = Path.GetExtension(name).ToLower();
|
|
var imageExtensions = new List<string> { ".jpg", ".png", ".ico", ".tif", ".bmp", ".gif" };
|
return imageExtensions.Contains(extension);
|
}
|
|
/// <summary>
|
/// 判断一个文件是否为pdf文件
|
/// </summary>
|
/// <param name="name"></param>
|
/// <returns></returns>
|
public static bool IsPdf(string name)
|
{
|
var extension = Path.GetExtension(name).ToLower();
|
var pdfExtensions = new List<string> { ".pdf" };
|
return pdfExtensions.Contains(extension);
|
}
|
|
/// <summary>
|
/// 将指定路径下的文件转为byte数组
|
/// </summary>
|
/// <param name="path">指定路径</param>
|
/// <returns></returns>
|
public static byte[] GetBytesByFile(string path)
|
{
|
try
|
{
|
if (!File.Exists(path))
|
{
|
return new byte[0];
|
}
|
|
var fileInfo = new FileInfo(path);
|
byte[] buff = new byte[fileInfo.Length];
|
|
var fileStream = fileInfo.OpenRead();
|
fileStream.Read(buff, 0, int.Parse(fileStream.Length.ToString()));
|
fileStream.Close();
|
return buff;
|
}
|
catch (Exception ex)
|
{
|
LogTextHelper.WriteLog(Resources.LogDir, "FileHelper", "GetBytesByFile", ex.Message);
|
return new byte[0];
|
}
|
}
|
|
/// <summary>
|
/// 将指定路径下的图片转成base64字符串
|
/// </summary>
|
/// <param name="path"></param>
|
/// <returns></returns>
|
public static string GetBase64Str(string path)
|
{
|
|
try
|
{
|
|
using (MemoryStream ms1 = new MemoryStream())
|
{
|
var bmp1 = new Bitmap(path);
|
bmp1.Save(ms1, System.Drawing.Imaging.ImageFormat.Jpeg);
|
byte[] arr1 = new byte[ms1.Length];
|
ms1.Position = 0;
|
ms1.Read(arr1, 0, (int)ms1.Length);
|
ms1.Close();
|
bmp1.Dispose();
|
return Convert.ToBase64String(arr1);
|
}
|
}
|
catch (Exception ex)
|
{
|
LogTextHelper.WriteLog(Resources.LogDir, "FileHelper", "GetBytesByFile", ex.Message);
|
return null;
|
}
|
}
|
|
|
public static string GetBase64Str(Bitmap bitMap)
|
{
|
|
try
|
{
|
|
using (MemoryStream ms1 = new MemoryStream())
|
{
|
bitMap.Save(ms1, System.Drawing.Imaging.ImageFormat.Jpeg);
|
byte[] arr1 = new byte[ms1.Length];
|
ms1.Position = 0;
|
ms1.Read(arr1, 0, (int)ms1.Length);
|
ms1.Close();
|
return Convert.ToBase64String(arr1);
|
}
|
}
|
catch (Exception ex)
|
{
|
LogTextHelper.WriteLog(Resources.LogDir, "FileHelper", "GetBytesByFile", ex.Message);
|
return null;
|
}
|
}
|
|
/// <summary>
|
/// 是否base64字符串
|
/// </summary>
|
/// <param name="base64Str">要判断的字符串</param>
|
/// <param name="bytes">字符串转换成的字节数组</param>
|
/// <returns></returns>
|
public static bool IsBase64(string base64Str, out byte[] bytes)
|
{
|
//string strRegex = "^([A-Za-z0-9+/]{4})*([A-Za-z0-9+/]{4}|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{2}==)$";
|
bytes = null;
|
if (string.IsNullOrEmpty(base64Str))
|
return false;
|
else
|
{
|
if (base64Str.Contains(","))
|
base64Str = base64Str.Split(',')[1];
|
if (base64Str.Length % 4 != 0)
|
return false;
|
if (base64Str.Any(c => !base64CodeArray.Contains(c)))
|
return false;
|
}
|
try
|
{
|
bytes = Convert.FromBase64String(base64Str);
|
return true;
|
}
|
catch (FormatException)
|
{
|
return false;
|
}
|
}
|
|
/// <summary>
|
/// 把base64字符串转换成Bitmap
|
/// </summary>
|
/// <param name="base64Str">要转换的base64字符串</param>
|
/// <returns></returns>
|
public static Bitmap Base64ToBitmap(string base64Str)
|
{
|
Bitmap bitmap = null;
|
byte[] bytes = null;
|
try
|
{
|
if (IsBase64(base64Str, out bytes))
|
{
|
using (MemoryStream stream = new MemoryStream(bytes))
|
{
|
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
|
bitmap = new Bitmap(stream);
|
}
|
}
|
}
|
catch (Exception)
|
{
|
bitmap = null;
|
}
|
return bitmap;
|
}
|
|
|
/// <summary>
|
/// 删除文件夹strDir中nDays天以前的文件
|
/// </summary>
|
/// <param name="dir"></param>
|
/// <param name="days"></param>
|
public static void DeleteOldFiles(string dir, int days)
|
{
|
try
|
{
|
if (!Directory.Exists(dir) || days < 1) return;
|
|
var now = DateTime.Now;
|
foreach (var f in Directory.GetFileSystemEntries(dir).Where(f => File.Exists(f)))
|
{
|
var t = File.GetCreationTime(f);
|
|
var elapsedTicks = now.Ticks - t.Ticks;
|
var elapsedSpan = new TimeSpan(elapsedTicks);
|
|
if (elapsedSpan.TotalDays > days) File.Delete(f);
|
}
|
}
|
catch (Exception)
|
{
|
// ignored
|
}
|
}
|
|
|
|
}
|
}
|
