我利用C++Builder将汉字编码为BASE64编码
以下是编码函数// 4bit binary to char 0-F
char Hex2Chr( unsigned char n )
{
n &= 0xF;
if ( n < 10 )
return ( char )( n + '0' );
else
return ( char )( n - 10 + 'A' );
}
//---------------------------------------------------------------------------
// char 0-F to 4bit binary
unsigned char Chr2Hex( char c )
{
if ( c >= 'a' && c <= 'z' ) // it's toupper
c = c - 'a' + 'A';
if ( c >= '0' && c <= '9' )
return ( int )( c - '0' );
else if ( c >= 'A' && c <= 'F' )
return ( int )( c - 'A' + 10 );
else
return -1;
}
//---------------------------------------------------------------------------
// Base64 code table
// 0-63 : A-Z(25) a-z(51), 0-9(61), +(62), /(63)
char Base2Chr( unsigned char n )
{
n &= 0x3F;
if ( n < 26 )
return ( char )( n + 'A' );
else if ( n < 52 )
return ( char )( n - 26 + 'a' );
else if ( n < 62 )
return ( char )( n - 52 + '0' );
else if ( n == 62 )
return '+';
else
return '/';
}
//---------------------------------------------------------------------------
unsigned char Chr2Base( char c )
{
if ( c >= 'A' && c <= 'Z' )
return ( unsigned char )( c - 'A' );
else if ( c >= 'a' && c <= 'z' )
return ( unsigned char )( c - 'a' + 26 );
else if ( c >= '0' && c <= '9' )
return ( unsigned char )( c - '0' + 52 );
else if ( c == '+' )
return 62;
else if ( c == '/' )
return 63;
else
return 64; // 无效字符
}
//---------------------------------------------------------------------------
// aLen 为 aSrc 的长度, aDest 所指的缓冲区必须至少为 aLen 的 1.33 倍!!!
// 返回 aDest 的长度
int Base64Encode( char * const aDest, const unsigned char * aSrc, int aLen )
{
char * p = aDest;
int i;
unsigned char t; for ( i = 0; i < aLen; i++ )
{
switch ( i % 3 )
{
case 0 :
*p++ = Base2Chr( *aSrc >> 2 );
t = ( *aSrc++ << 4 ) & 0x3F;
break;
case 1 :
*p++ = Base2Chr( t | ( *aSrc >> 4 ) );
t = ( *aSrc++ << 2 ) & 0x3F;
break;
case 2 :
*p++ = Base2Chr( t | ( *aSrc >> 6 ) );
*p++ = Base2Chr( *aSrc++ );
break;
}
}
if ( aLen % 3 != 0 )
{
*p++ = Base2Chr( t );
if ( aLen % 3 == 1 )
*p++ = '=';
*p++ = '=';
}
*p = 0; // aDest is an ASCIIZ string
return ( p - aDest ); // exclude the end of zero
}AnsiString TFormUpload::MimeQPBase64( AnsiString aSrc, int aOp )
{
int n;
TMemoryStream * buf;
AnsiString s = ""; buf = new TMemoryStream( );
try
{
n = aSrc.Length( );
if ( aOp == 0 )
{ // QPEncode
buf->Size = n * 3 + 1;
QPEncode( ( char * )( buf->Memory ), ( unsigned char * )( aSrc.c_str( ) ), n );
}
else if ( aOp == 2 )
{ // Base64Encode
buf->Size = n * 4 / 3 + 1;
Base64Encode( ( char * )( buf->Memory ), ( unsigned char * )( aSrc.c_str( ) ), n );
}
else
{
buf->Size = n + 1;
if ( aOp == 1 ) // QPDecode
n = QPDecode( ( unsigned char * )( buf->Memory ), aSrc.c_str( ) );
else // Base64Decode
n = Base64Decode( ( unsigned char * )( buf->Memory ), aSrc.c_str( ) );
( ( char * )( buf->Memory ) )[n] = 0;
}
s = AnsiString( ( char * )( buf->Memory ) );
}
__finally
{
delete buf;
}
return s;
}利用编码函数
我将人员姓名例如“刘娜”编码为BASE64“wfXEyA==”
AnsiString XM="刘娜";
XM= MimeQPBase64(XM,2);并保存,然后在C#中,我将“wfXEyA==”解码为汉字: string XM;
XM=System.Text.Encoding.Default.GetString(Convert.FromBase64String(@"wfXEyA=="));可是显示出来的是乱码:鍒樺这是为什么啊??????????????????????
以下是编码函数// 4bit binary to char 0-F
char Hex2Chr( unsigned char n )
{
n &= 0xF;
if ( n < 10 )
return ( char )( n + '0' );
else
return ( char )( n - 10 + 'A' );
}
//---------------------------------------------------------------------------
// char 0-F to 4bit binary
unsigned char Chr2Hex( char c )
{
if ( c >= 'a' && c <= 'z' ) // it's toupper
c = c - 'a' + 'A';
if ( c >= '0' && c <= '9' )
return ( int )( c - '0' );
else if ( c >= 'A' && c <= 'F' )
return ( int )( c - 'A' + 10 );
else
return -1;
}
//---------------------------------------------------------------------------
// Base64 code table
// 0-63 : A-Z(25) a-z(51), 0-9(61), +(62), /(63)
char Base2Chr( unsigned char n )
{
n &= 0x3F;
if ( n < 26 )
return ( char )( n + 'A' );
else if ( n < 52 )
return ( char )( n - 26 + 'a' );
else if ( n < 62 )
return ( char )( n - 52 + '0' );
else if ( n == 62 )
return '+';
else
return '/';
}
//---------------------------------------------------------------------------
unsigned char Chr2Base( char c )
{
if ( c >= 'A' && c <= 'Z' )
return ( unsigned char )( c - 'A' );
else if ( c >= 'a' && c <= 'z' )
return ( unsigned char )( c - 'a' + 26 );
else if ( c >= '0' && c <= '9' )
return ( unsigned char )( c - '0' + 52 );
else if ( c == '+' )
return 62;
else if ( c == '/' )
return 63;
else
return 64; // 无效字符
}
//---------------------------------------------------------------------------
// aLen 为 aSrc 的长度, aDest 所指的缓冲区必须至少为 aLen 的 1.33 倍!!!
// 返回 aDest 的长度
int Base64Encode( char * const aDest, const unsigned char * aSrc, int aLen )
{
char * p = aDest;
int i;
unsigned char t; for ( i = 0; i < aLen; i++ )
{
switch ( i % 3 )
{
case 0 :
*p++ = Base2Chr( *aSrc >> 2 );
t = ( *aSrc++ << 4 ) & 0x3F;
break;
case 1 :
*p++ = Base2Chr( t | ( *aSrc >> 4 ) );
t = ( *aSrc++ << 2 ) & 0x3F;
break;
case 2 :
*p++ = Base2Chr( t | ( *aSrc >> 6 ) );
*p++ = Base2Chr( *aSrc++ );
break;
}
}
if ( aLen % 3 != 0 )
{
*p++ = Base2Chr( t );
if ( aLen % 3 == 1 )
*p++ = '=';
*p++ = '=';
}
*p = 0; // aDest is an ASCIIZ string
return ( p - aDest ); // exclude the end of zero
}AnsiString TFormUpload::MimeQPBase64( AnsiString aSrc, int aOp )
{
int n;
TMemoryStream * buf;
AnsiString s = ""; buf = new TMemoryStream( );
try
{
n = aSrc.Length( );
if ( aOp == 0 )
{ // QPEncode
buf->Size = n * 3 + 1;
QPEncode( ( char * )( buf->Memory ), ( unsigned char * )( aSrc.c_str( ) ), n );
}
else if ( aOp == 2 )
{ // Base64Encode
buf->Size = n * 4 / 3 + 1;
Base64Encode( ( char * )( buf->Memory ), ( unsigned char * )( aSrc.c_str( ) ), n );
}
else
{
buf->Size = n + 1;
if ( aOp == 1 ) // QPDecode
n = QPDecode( ( unsigned char * )( buf->Memory ), aSrc.c_str( ) );
else // Base64Decode
n = Base64Decode( ( unsigned char * )( buf->Memory ), aSrc.c_str( ) );
( ( char * )( buf->Memory ) )[n] = 0;
}
s = AnsiString( ( char * )( buf->Memory ) );
}
__finally
{
delete buf;
}
return s;
}利用编码函数
我将人员姓名例如“刘娜”编码为BASE64“wfXEyA==”
AnsiString XM="刘娜";
XM= MimeQPBase64(XM,2);并保存,然后在C#中,我将“wfXEyA==”解码为汉字: string XM;
XM=System.Text.Encoding.Default.GetString(Convert.FromBase64String(@"wfXEyA=="));可是显示出来的是乱码:鍒樺这是为什么啊??????????????????????
byte[] Temp=Convert.FromBase64String(@"wfXEyA=="); MessageBox.Show(System.Text.Encoding.GetEncoding("GB2312").GetString(Temp));看看