internal static string BytesToText(byte[] buff, Encoding encoding)
{
if (buff.Length == 0)
{
return("");
}
TextEncodingDetect detect = new TextEncodingDetect();
encoding = detect.GetEncoding(buff, encoding);
if (detect.hasBom)
{
if (encoding == Encoding.UTF8)
{
return(encoding.GetString(buff, 3, buff.Length - 3));
}
if (encoding == Encoding.Unicode || encoding == Encoding.BigEndianUnicode)
{
return(encoding.GetString(buff, 2, buff.Length - 2));
}
if (encoding == Encoding.UTF32)
{
return(encoding.GetString(buff, 4, buff.Length - 4));
}
}
return(encoding.GetString(buff));
}
internal static bool Save(string fileName, string text, bool isAppend, bool writeLogOnError, Encoding encode)
{
try
{
//System.Text.Encoding.UTF8
string folder = Path.GetDirectoryName(fileName);
if (!Directory.Exists(folder))
{
Directory.CreateDirectory(folder);
}
string key = "IOHelper_Save_" + fileName.GetHashCode();
if (cache.Contains(key))
{
encode = cache.Get <Encoding>(key);
}
else if (File.Exists(fileName))
{
TextEncodingDetect detect = new TextEncodingDetect();
Encoding detectEncode = detect.GetEncoding(File.ReadAllBytes(fileName), encode);
if (detectEncode != Encoding.ASCII)
{
encode = detectEncode;
}
cache.Set(key, encode, 60);
}
lock (GetLockObj(fileName.Length))
{
using (StreamWriter writer = new StreamWriter(fileName, isAppend, encode))
{
writer.Write(text);
}
}
return(true);
}
catch (Exception err)
{
if (writeLogOnError)
{
Log.WriteLogToTxt(err);
}
else
{
Error.Throw("IOHelper.Save() : " + err.Message);
}
}
return(false);
}
internal static bool Save(string fileName, string text, bool isAppend, bool writeLogOnError, Encoding encode, int tryCount)
{
try
{
//System.Text.Encoding.UTF8
string folder = Path.GetDirectoryName(fileName);
if (!Directory.Exists(folder))
{
Directory.CreateDirectory(folder);
}
string key = "IOHelper_Save_" + fileName.GetHashCode();
if (cache.Contains(key))
{
encode = cache.Get <Encoding>(key);
}
else if (File.Exists(fileName))
{
TextEncodingDetect detect = new TextEncodingDetect();
Encoding detectEncode = detect.GetEncoding(File.ReadAllBytes(fileName), encode);
if (detectEncode != Encoding.ASCII)
{
encode = detectEncode;
}
cache.Set(key, encode, 60);
}
lock (GetLockObj(fileName.Length))
{
try
{
using (StreamWriter writer = new StreamWriter(fileName, isAppend, encode))
{
if (!isAppend && fileName.EndsWith(".txt"))
{
//写入bom头
}
writer.Write(text);
}
}
catch (Exception err)
{
if (tryCount > 0)
{
tryCount--;
Thread.Sleep(500 + (3 - tryCount) * 500);
Save(fileName, text, isAppend, writeLogOnError, encode, tryCount);
}
else
{
Error.Throw(err.Message);
}
}
}
return(true);
}
catch (Exception err)
{
if (tryCount == 3) // 避免死循环。
{
if (writeLogOnError)
{
Log.Write(err, LogType.Error);
}
else
{
Error.Throw("IOHelper.Save() : " + err.Message);
}
}
}
return(false);
}
public static string BytesToText(byte[] buff, Encoding encoding)
{
if (buff.Length == 0)
{
return("");
}
//if (buff[0] == 239 && buff[1] == 187 && buff[2] == 191)
//{
// return Encoding.UTF8.GetString(buff, 3, buff.Length - 3);
//}
//else if (buff[0] == 255 && buff[1] == 254)
//{
// return Encoding.Unicode.GetString(buff, 2, buff.Length - 2);
//}
//else if (buff[0] == 254 && buff[1] == 255)
//{
// if (buff.Length > 3 && buff[2] == 0 && buff[3] == 0)
// {
// return Encoding.UTF32.GetString(buff, 4, buff.Length - 4);
// }
// return Encoding.BigEndianUnicode.GetString(buff, 2, buff.Length - 2);
//}
//else
//{
TextEncodingDetect detect = new TextEncodingDetect();
//检测Bom
switch (detect.DetectWithBom(buff))
{
case TextEncodingDetect.Encoding.Utf8Bom:
return(Encoding.UTF8.GetString(buff, 3, buff.Length - 3));
case TextEncodingDetect.Encoding.UnicodeBom:
return(Encoding.Unicode.GetString(buff, 2, buff.Length - 2));
case TextEncodingDetect.Encoding.BigEndianUnicodeBom:
return(Encoding.BigEndianUnicode.GetString(buff, 2, buff.Length - 2));
case TextEncodingDetect.Encoding.Utf32Bom:
return(Encoding.UTF32.GetString(buff, 4, buff.Length - 4));
}
if (encoding != DefaultEncoding && encoding != Encoding.ASCII)//自定义设置编码，优先处理。
{
return(encoding.GetString(buff));
}
switch (detect.DetectWithoutBom(buff, buff.Length > 1000 ? 1000 : buff.Length))//自动检测。
{
case TextEncodingDetect.Encoding.Utf8Nobom:
return(Encoding.UTF8.GetString(buff));
case TextEncodingDetect.Encoding.UnicodeNoBom:
return(Encoding.Unicode.GetString(buff));
case TextEncodingDetect.Encoding.BigEndianUnicodeNoBom:
return(Encoding.BigEndianUnicode.GetString(buff));
case TextEncodingDetect.Encoding.Utf32NoBom:
return(Encoding.UTF32.GetString(buff));
case TextEncodingDetect.Encoding.Ansi:
if (IsChineseEncoding(DefaultEncoding) && !IsChineseEncoding(encoding))
{
if (detect.IsChinese)
{
return(Encoding.GetEncoding("gbk").GetString(buff));
}
else //非中文时，默认选一个。
{
return(Encoding.Unicode.GetString(buff));
}
}
else
{
return(encoding.GetString(buff));
}
case TextEncodingDetect.Encoding.Ascii:
return(Encoding.ASCII.GetString(buff));
default:
return(encoding.GetString(buff));
}
// }
}
