imagebase64.pas

来自「delphi的XMPRPC通讯例子」· PAS 代码 · 共 89 行

unit ImageBase64;

interface

uses Classes,Graphics,ExtCtrls,Jpeg, IdCoderMIME;

function Image2Base64(const image:TGraphic; var base64Str:string):integer;
{
  输入参数：
    image:图片
  输出参数：
    base64Str:Base64字符串
  返回值：
    -1:没有图片
    0:成功
}
function Base642Image(image:TGraphic; const base64Str:string):integer;
{
  输入参数：
    base64Str:Base64字符串
  输出参数：
    image:图片
  返回值：
    -1:base64字符串为空
    0:成功
}

implementation

function Image2Base64(const image:TGraphic; var base64Str:string):integer;
var
  stream:TMemoryStream;
  encode64:TIdEncoderMIME;
begin
  if (image = nil) or (image.Empty) then
  begin
    Result:=-1;
    Exit;
  end;
  stream:=TMemoryStream.Create;
  try
    encode64:=TIdEncoderMIME.Create(nil);
    try
//      encode64.FillChar:=#0;
      image.SaveToStream(stream);
      stream.Position:=0;
      base64Str:=encode64.Encode(stream);//,stream.Size);
    finally
      encode64.Free;
    end;
  finally
    stream.Free;
  end;
  Result:=0;
end;

function Base642Image(image:TGraphic; const base64Str:string):integer;
var
  stream:TMemoryStream;
  decode64:TIdDecoderMIME;
  jpegImg:TImage;
begin
  if (base64Str='') then
  begin
    Result:=-1;
    Exit;
  end;

  jpegImg:=TImage.Create(nil);
  stream:=TMemoryStream.Create;
  try
    decode64:=TIdDecoderMIME.Create(nil);
    try
//      decode64.FillChar:=#=;
      decode64.DecodeToStream(base64Str,stream);
      stream.Position:=0;
      image.LoadFromStream(stream);
    finally
      jpegImg.Free;
      decode64.Free;
    end;
  finally
    stream.Free;
  end;
  Result:=0;
end;

end.