Using System;
Namespace Sclasslibrary.sencoding
{
<summary>
Related operations on Base64 coding algorithms
Author: Ying Guang
</summary>
public class SBase64
{
Public SBase64 ()
{
//
TODO: Add constructor logic here
//
}
//--------------------------------------------------------------------------------
<summary>
Encrypt a string using the Base64 algorithm
</summary>
<param name= "sourcestring" > Strings to be encrypted </param>
<param name= "Ens" >system.text.encoding object, such as creating a Chinese encoding Set object: System.Text.Encoding.GetEncoding (54936) </param >
<returns> text string after the overweight </returns>
public static string Encodingforstring (String sourcestring,system.text.encoding ens)
{
Return convert.tobase64string (Ens. GetBytes (sourcestring));
}
<summary>
Encrypt a string using the Base64 algorithm
</summary>
<param name= "sourcestring" > Strings to be encrypted </param>
<returns> text string after the overweight </returns>
public static string Encodingforstring (String sourcestring)
{
Return encodingforstring (sourcestring,system.text.encoding.getencoding (54936));
}
<summary>
To restore a string from a base64 encoded string, support Chinese
</summary>
<param name= "base64string" >base64 encrypted string </param>
<param name= "Ens" >system.text.encoding object, such as creating a Chinese encoding Set object: System.Text.Encoding.GetEncoding (54936) </param >
<returns> text string after restore </returns>
public static string Decodingforstring (String base64string,system.text.encoding ens)
{
/**
* ***********************************************************
*
* Internal code (ANSI character encoding) of bytes obtained from base64string
* Generally, the conversion of the machine code to Chinese characters is the formula:
* (char) (the first byte of the binary value *256+ the second byte value)
* and char or string in C # because of Unicode encoding, it is not possible to follow the formula above
* ANSI Byte and Unicode encoding incompatible
* Using the encoding class provided by the. NET class library to convert from ANSI to Unicode code
*
* The GetEncoding method relies on most of the code pages supported by the underlying platform. However, system support is provided for the following conditions: The default encoding, the encoding specified in the locale of the computer executing this method, Little-endian Unicode (utf-16le), Big-endian Unicode (UTF-16BE), and Windows Operating system (windows-1252); Utf-7;utf-8;ascii and GB18030 (Simplified Chinese).
*
* Specify one of the names listed in the following table to obtain a system-supported encoding with the corresponding code page.
*
* code page name
* 1200 "Utf-16le", "utf-16", "ucs-2", "Unicode" or "iso-10646-ucs-2"
* 1201 "utf-16be" or "Unicodefffe"
* 1252 "windows-1252"
* 65000 "utf-7", "Csunicode11utf7", "unicode-1-1-utf-7", "unicode-2-0-utf-7", "x-unicode-1-1-utf-7" or " X-unicode-2-0-utf-7 "
* 65001 "Utf-8", "Unicode-1-1-utf-8", "Unicode-2-0-utf-8", "X-unicode-1-1-utf-8" or "X-unicode-2-0-utf-8"
* 20127 "Us-ascii", "Us", "ASCII", "ansi_x3.4-1968", "ansi_x3.4-1986", "cp367", "Csascii", "IBM367", "iso-ir-6", " Iso646-us "or" iso_646.irv:1991 "
* 54936 "GB18030"
*
* Some platforms may not support specific code pages. For example, the American version of Windows 98 may not support the Japanese Shift-jis code page (code page 932). In this case, the GetEncoding method will raise the NotSupportedException when executing the following C # code:
*
* Encoding enc = encoding.getencoding ("Shift-jis");
*
* **************************************************************/
Get the original character from the Base64string
Return ENS. GetString (convert.frombase64string (base64string));
}
<summary>
To restore a string from a base64 encoded string, support Chinese
</summary>
<param name= "base64string" >base64 encrypted string </param>
<returns> text string after restore </returns>
public static string Decodingforstring (String base64string)
{
Return decodingforstring (base64string,system.text.encoding.getencoding (54936));
}
//--------------------------------------------------------------------------------------
<summary>
Base64 any type of file
</summary>
<param name= "filename" > File path and filename </param>
<returns> string after base64 encoding of files </returns>
public static string Encodingforfile (String fileName)
{
System.IO.FileStream Fs=system.io.file.openread (fileName);
System.IO.BinaryReader br= New System.IO.BinaryReader (FS);
/*system.byte[] B=new System.byte[fs. Length];
Fs. Read (B,0,convert.toint32 (FS). Length));
String Base64string=convert.tobase64string (Br. readbytes (int) fs. Length));
Br. Close ();
Fs. Close ();
return base64string;
}
<summary>
Save a base64 encoded string as a file
</summary>
<param name= "base64string" > Base64 after the string </param>
<param name= "filename" > Save file path and filename </param>
<returns> Save File Success </returns>
public static bool Savedecodingtofile (String base64string,string fileName)
{
System.IO.FileStream fs=new System.IO.FileStream (FileName, System.IO.FileMode.Create);
System.IO.BinaryWriter bw = new System.IO.BinaryWriter (FS);
Bw. Write (convert.frombase64string (base64string));
Bw. Close ();
Fs. Close ();
return true;
}
//-------------------------------------------------------------------------------
<summary>
Obtain a file from the network address and convert it to base64 encoding
</summary>
<param name= "url" > file URL address, an absolute URL address </param>
<param name= "Objwebclient" >system.net.webclient object </param>
<returns></returns>
public static string Encodingfilefromurl (String url,system.net.webclient objwebclient)
{
Return convert.tobase64string (Objwebclient.downloaddata (URL));
}
<summary>
Obtain a file from the network address and convert it to base64 encoding
</summary>
<param name= "url" > file URL address, an absolute URL address </param>
<returns> convert file to Base64 string </returns>
public static string Encodingfilefromurl (string url)
{
System.Net.WebClient mywebclient = new System.Net.WebClient ();
Return Encodingfilefromurl (Url,new System.Net.WebClient ());
}
}
}
