delphi 調用百度識別

雖然百度大家一直在罵，但是我發現其實百度有些東西還是可以用的。現在大家都搞人工智慧了，我們Delphi也不可以落後。廢話不多說，直接上代碼

第一步，先獲取AccessToken

function GetAccessToken(const client_id, client_secret: string;
  HTTP: TNetHTTPClient;out access_token,expires_in,error:String):Boolean;
var
 URL:String;
 cParam:TStringList;
 FJson:TJsonObject;
 S:string;
begin
  URL:='https://aip.baidubce.com/oauth/2.0/token';
  cParam:=TStringList.Create;
  cParam.Add('grant_type=client_credentials');
  cParam.Add('client_id='+client_id);
  cParam.Add('client_secret='+client_secret);
  try
  s:=HTTP.Post(URL,cParam).ContentAsString;
  FJson:=TJSONObject.ParseJSONValue(s) as TJSONObject;
  error:='';
  if FJson.Values['error']<>nil then
   begin
     if FJson.Values['error_description'].Value='unknown client id' then
       error:='API Key不正確';
     if FJson.Values['error_description'].Value='Client authentication failed' then
       error:='Secret Key不正確';
     if error='' then
       error:='未知錯誤';
       FJson.Free;
     Exit(false);
   end;
    access_token:=FJson.Values['access_token'].Value;
    expires_in:=FJson.Values['expires_in'].Value;
    Result:=True;
    FJson.Free;
  finally
    cParam.Clear;
    cParam.Free;
  end;
end;

　　第二步，將我們要識別的圖片進行編碼

function ImageTobase64(Image:TStream):String;
Var
 FStream:TStringStream;
begin
 FStream:=TStringStream.Create;
 TBase64Encoding.Base64.Encode(Image,FStream);
 FStream.Position:=0;
 REsult:=TURLEncoding.URL.Encode(FStream.DataString);
end;

　　最後，就是調用百度的識別服務了

function GetORC(Image:TStream;HTTP: TNetHTTPClient;const access_token:String):string;
var
  cImage:String;
  URL:String;
  cParam:TStringStream;
  cStr:TStringList;
  JO:TJSONObject;
  JA:TJSONArray;
  JV:TJSONValue;
begin

  cImage:=ImageTobase64(Image);
//  URL:='https://aip.baidubce.com/rest/2.0/ocr/v1/general?access_token='+access_token;
  URL:='https://aip.baidubce.com/rest/2.0/ocr/v1/accurate_basic?access_token='+access_token;
  HTTP.ContentType:='application/x-www-form-urlencoded;charset=UTF-8';
  cParam:= TStringStream.Create;
  cStr:=TStringList.Create;
  cStr.Add('image='+cImage);
  cSTr.Add('detect_direction=true');
  cstr.Delimiter:='&';
  cParam.WriteString(cStr.DelimitedText);
  cstr.Free;
  cParam.Position:=0;
  result:=HTTP.Post(URL,cParam).ContentAsString();
  JO:=TJSONObject.ParseJSONValue(Result) as TJSONObject;
  if JO.Values['error_code']<>nil then
    begin
      result:=JO.Values['error_code'].Value+','+JO.Values['error_msg'].Value;
      Exit;
    end;
  JA:=Jo.Values['words_result'] as TJSONArray;
  result:='';
  for JV in JA do
    result:=Result+Jv.P['words'].Value;

//  Result:=JA.ToString;
  cParam.Free;

end;

　　這裡貼上的都是關鍵的代碼，具體的使用和免費額度，請自行百度。下麵再貼一下效果圖