uses jpeg,EncdDecd,ZLibEx

//字符串base64 編碼
Function StrtoBase64(const Str:string):string;
begin
?result:=EncodeString(Str);
end;
//字符串base64 ?解碼
Function Base64toStr(const Base64:string):string;
begin
?result:=DecodeString(base64);
end;
//Jpeg base64 ?編碼
Function JpegToBase64(Jpeg : Tjpegimage):string;
var
? jpegstream : TMemoryStream;
? StrStream ?: TStringStream;
begin
? jpegstream :=TMemoryStream.Create;
? StrStream ?:=TStringStream.Create('');
? jpeg.SaveToStream(jpegstream);
? jpegstream.Position:=0;
? EncodeStream(Jpegstream,strstream);
? result:=strstream.DataString;
? jpegstream.Free;
? strstream.Free;
end;
//Jpeg base64 ?解碼
Function Base64ToJpeg(str: string):TJpegimage;
var
? jpegstream : TMemoryStream;
? StrStream ?: TStringStream;
begin
? jpegstream :=TMemoryStream.Create;
? StrStream ?:=TStringStream.Create(str);
? DecodeStream(StrStream,JpegStream);
? JpegStream.Position:=0;
? result:=TJpegimage.Create;
? result.LoadFromStream(JpegStream);
? jpegstream.Free;
? strstream.Free;
?
end;

?

///將Bitmap位圖轉(zhuǎn)化為base64字符串
function?BitmapToString(img:TBitmap):string?;
var
??ms:TMemoryStream;
??ss:TStringStream;
??s:string;
begin
????ms?:=?TMemoryStream.Create;
????img.SaveToStream(ms);
????ss?:=?TStringStream.Create('');
????ms.Position:=0;
????EncodeStream(ms,ss);//將內(nèi)存流編碼為base64字符流
????s:=ss.DataString;
????ms.Free;
????ss.Free;
????result:=s;?
end;

///將base64字符串轉(zhuǎn)化為Bitmap位圖
function?StringToBitmap(imgStr:string):TBitmap;
var?ss:TStringStream;
????ms:TMemoryStream;
????bitmap:TBitmap;
begin
????ss?:=?TStringStream.Create(imgStr);
????ms?:=?TMemoryStream.Create;
????DecodeStream(ss,ms);//將base64字符流還原為內(nèi)存流
????ms.Position:=0;
????bitmap?:=?TBitmap.Create;
????bitmap.LoadFromStream(ms);
????ss.Free;
????ms.Free;
????result?:=bitmap;
end;

function CompressStrToBase64(sStr: string): string;
var
? M1: TMemoryStream;
? M0, M2: TStringStream;
begin
? Result := '';
? if sStr = '' then
??? Exit;
? M0 := TStringStream.Create(sStr);
? M1 := TMemoryStream.Create;
? M2 := TStringStream.Create(' ');
? try
??? M0.Position := 0;
??? M1.Position := 0;
??? ZCompressStream(M0, M1);
??? M1.Position := 0;
??? M2.Position := 0;
??? EncodeStream(M1, M2);
??? Result := M2.DataString;
? finally
??? FreeAndNil(M0);
??? FreeAndNil(M1);
??? FreeAndNil(M2);
? end;
end;

function DeCompressBase64ToStr(sStr: string): string;
var
? M0, M1: TStringStream;
? M2: TMemoryStream;
begin
? Result := '';
? if sStr = '' then
??? Exit;
? M0 := TStringStream.Create;
? M1 := TStringStream.Create(sStr);
? M2 := TMemoryStream.Create;
? try
??? M1.Position := 0;
??? M2.Position := 0;
??? DeCodeStream(M1, M2);
??? M0.Position := 0;
??? M2.Position := 0;
??? ZDecompressStream(M2, M0);
??? Result := M0.DataString;
? finally
??? FreeAndNil(M0);
??? FreeAndNil(M2);
??? FreeAndNil(M1);
? end;
end;

?

轉(zhuǎn)載于:https://www.cnblogs.com/hnxxcxg/archive/2011/08/14/2940595.html

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