Unit EMail_Code;
Interface
Uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;
Const
cBase64 = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
Function QuotedPrintableEncode(mSource: String): String;
Function QuotedPrintableDecode(mCode: String): String;
Function Base64Encode(mSource: String; mAddLine: Boolean = True): String;
Function Base64Decode(mCode: String): String;
Function GetTitle(Const Value: String): String;
Implementation
Uses TG;
Function QuotedPrintableEncode(mSource: String): String;
Var
I, J: Integer;
Begin
Result := '';
J := 0;
For I := 1 To Length(mSource) Do Begin
If mSource[I] In [#32..#127, #13, #10] - ['='] Then Begin
Result := Result + mSource[I];
Inc(J);
End Else Begin
Result := Result + '=' + IntToHex(Ord(mSource[I]), 2);
Inc(J, 3);
End;
If mSource[I] In [#13, #10] Then J := 0;
If J >= 70 Then Begin
Result := Result + #13#10;
J := 0;
End;
End;
End; { QuotedPrintableEncode }
Function QuotedPrintableDecode(mCode: String): String;
Var
I, J, L: Integer;
Begin
Result := '';
J := 0;
mCode := AdjustLineBreaks(mCode);
L := Length(mCode);
I := 1;
While I <= L Do Begin
If mCode[I] = '=' Then Begin
Result := Result + Chr(StrToIntDef('$' + Copy(mCode, I + 1, 2), 0));
Inc(J, 3);
Inc(I, 3);
End Else If mCode[I] In [#13, #10] Then Begin
If J < 70 Then Result := Result + mCode[I];
If mCode[I] = #10 Then J := 0;
Inc(I);
End Else Begin
Result := Result + mCode[I];
Inc(J);
Inc(I);
End;
End;
End; { QuotedPrintableDecode }
Function Base64Encode(mSource: String; mAddLine: Boolean = True): String;
Var
I, J: Integer;
S: String;
Begin
Result := '';
J := 0;
For I := 0 To Length(mSource) Div 3 - 1 Do Begin
S := Copy(mSource, I * 3 + 1, 3);
Result := Result + cBase64[Ord(S[1]) Shr 2 + 1];
Result := Result + cBase64[((Ord(S[1]) And $03) Shl 4) + (Ord(S[2]) Shr 4) + 1];
Result := Result + cBase64[((Ord(S[2]) And $0F) Shl 2) + (Ord(S[3]) Shr 6) + 1];
Result := Result + cBase64[Ord(S[3]) And $3F + 1];
If mAddLine Then Begin
Inc(J, 4);
If J >= 76 Then Begin
Result := Result + #13#10;
J := 0;
End;
End;
End;
I := Length(mSource) Div 3;
S := Copy(mSource, I * 3 + 1, 3);
Case Length(S) Of
1: Begin
Result := Result + cBase64[Ord(S[1]) Shr 2 + 1];
Result := Result + cBase64[(Ord(S[1]) And $03) Shl 4 + 1];
Result := Result + cBase64[65];
Result := Result + cBase64[65];
End;
2: Begin
Result := Result + cBase64[Ord(S[1]) Shr 2 + 1];
Result := Result + cBase64[((Ord(S[1]) And $03) Shl 4) + (Ord(S[2]) Shr 4) + 1];
Result := Result + cBase64[(Ord(S[2]) And $0F) Shl 2 + 1];
Result := Result + cBase64[65];
End;
End;
End; { Base64Encode }
Function Base64Decode(mCode: String): String;
Var
I, L: Integer;
S: String;
Begin
Result := '';
L := Length(mCode);
I := 1;
While I <= L Do Begin
If Pos(mCode[I], cBase64) > 0 Then Begin
S := Copy(mCode, I, 4);
If (Length(S) = 4) Then Begin
Result := Result + Chr((Pos(S[1], cBase64) - 1) Shl 2 +
(Pos(S[2], cBase64) - 1) Shr 4);
If S[3] <> cBase64[65] Then Begin
Result := Result + Chr(((Pos(S[2], cBase64) - 1) And $0F) Shl 4 +
(Pos(S[3], cBase64) - 1) Shr 2);
If S[4] <> cBase64[65] Then
Result := Result + Chr(((Pos(S[3], cBase64) - 1) And $03) Shl 6 +
(Pos(S[4], cBase64) - 1));
End;
End;
Inc(I, 4);
End Else Inc(I);
End;
End; { Base64Decode }
Function Find(SubStr, Str: String; IsEnd: Boolean = False): Integer;
Var
i: integer;
Begin
Result := 0;
If IsEnd Then
Begin
For i := Length(Str) Downto 0 Do
If Copy(Str, i, Length(SubStr)) = SubStr Then
Begin
Result := i;
Break;
End;
End
Else
For i := 0 To Length(Str) Do
If Copy(Str, i, Length(SubStr)) = SubStr Then
Begin
Result := i;
Break;
End;
End;
Function GetTitle(Const Value: String): String;
Var
TempStr, sStr, eStr: String;
Begin
sStr := Copy(Value, 1, Pos('=?', Value) - 1);
TempStr := Copy(Value, Pos('=?', Value) + 2, Length(Value));
eStr := Copy(TempStr, Find('?=', TempStr, True) + 2, Length(TempStr));
TempStr := Copy(TempStr, 1, Find('?=', TempStr, True) - 1);
If Pos('?B?', TempStr) > 0 Then
Begin
TempStr := Copy(TempStr, Pos('?B?', TempStr) + 3, Length(TempStr));
TempStr := Base64Decode(TempStr);
Result := sStr + TempStr + eStr;
Exit;
End
Else
If Pos('?b?', TempStr) > 0 Then
Begin
TempStr := Copy(TempStr, Pos('?b?', TempStr) + 3, Length(TempStr));
TempStr := Base64Decode(TempStr);
Result := sStr + TempStr + eStr;
Exit;
End;
If Pos('?Q?', TempStr) > 0 Then
Begin
TempStr := Copy(TempStr, Pos('?Q?', TempStr) + 3, Length(TempStr));
TempStr := QuotedPrintableDecode(TempStr);
Result := sStr + TempStr + eStr;
Exit;
End
Else
If Pos('?q?', TempStr) > 0 Then
Begin
TempStr := Copy(TempStr, Pos('?q?', TempStr) + 3, Length(TempStr));
TempStr := QuotedPrintableDecode(TempStr);
Result := sStr + TempStr + eStr;
Exit;
End;
Result := Value;
End;
===========================================================================================
indy有编码解码器的
base64的例子如下
可以直接这样用..
Caption := Base64Decode(IdMessage.From.Text);
Caption := Base64Decode(IdMessage.Subject.Text);
以下是自己写的，利用Indy9內建De/EncoderMIME解码..
//------------------------------------------------------------------------------
//Base64Decode
//------------------------------------------------------------------------------
function TMainForm.Base64Decode(strInput : string) : string;
var
strDecode : string;
posStart: Integer;
posEnd : Integer;
begin
while pos('=?gb2312?b?',lowercase(strInput)) > 0 do
begin
try
posStart := pos('=?gb2312?b?',lowercase(strInput));
posEnd := pos('?=',lowercase(strInput));
strDecode := strDecode + copy(strInput,1,posStart-1) + IdDeMIME.DecodeString(copy(strInput,posStart+11,posEnd-posStart-11));
strInput := copy(strInput,posEnd+2,length(strInput)-posEnd-1);
finally
Application.ProcessMessages;
end;
end;
strDecode := strDecode + strInput;
result := strDecode;
end;
//------------------------------------------------------------------------------
//Base64Encode
//------------------------------------------------------------------------------
function TMainForm.Base64Encode(strInput : string) : string;
var
strEncode : string;
begin
strEncode := IdEnMIME.EncodeString(strInput);
result := strEncode;
end;
//------------------------------------------------------------------------------
PS.
IdDeMIME是IdDecoderMIME
IdEnMIME是IdEncoderMIME
如果
while pos('=?gb2312?b?',lowercase(strInput)) > 0 do 是
while pos('=?gb2312?q?',lowercase(strInput)) > 0 do
则把IdDecoderMIME换成IdDecoderQuotedPrintable
IdEncoderMIME换成IdEncoderQuotedPrintable
试试
![极其无聊的 StrtoDate 失败[图]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)