Chilkat Online Tools

BatchDetectSentiment delphiDll Example

Amazon Comprehend

var
rest: HCkRest;
success: Boolean;
authAws: HCkAuthAws;
json: HCkJsonObject;
sbRequestBody: HCkStringBuilder;
sbResponseBody: HCkStringBuilder;
respStatusCode: Integer;
jResp: HCkJsonObject;
ErrorCode: PWideChar;
ErrorMessage: PWideChar;
Index: Integer;
Sentiment: PWideChar;
Mixed: Integer;
Negative: Integer;
Neutral: Integer;
Positive: Integer;
i: Integer;
count_i: Integer;

begin
// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

rest := CkRest_Create();

authAws := CkAuthAws_Create();
CkAuthAws_putAccessKey(authAws,'AWS_ACCESS_KEY');
CkAuthAws_putSecretKey(authAws,'AWS_SECRET_KEY');

// Don't forget to change the region to your particular region. (Also make the same change in the call to Connect below.)
CkAuthAws_putRegion(authAws,'us-west-2');
CkAuthAws_putServiceName(authAws,'comprehend');
// SetAuthAws causes Chilkat to automatically add the following headers: Authorization, X-Amz-Date
CkRest_SetAuthAws(rest,authAws);

// URL: https://comprehend.us-west-2.amazonaws.com/
// Use the same region as specified above.
success := CkRest_Connect(rest,'comprehend.us-west-2.amazonaws.com',443,True,True);
if (success <> True) then
  begin
    Memo1.Lines.Add('ConnectFailReason: ' + IntToStr(CkRest_getConnectFailReason(rest)));
    Memo1.Lines.Add(CkRest__lastErrorText(rest));
    Exit;
  end;

// The following code creates the JSON request body.
// The JSON created by this code is shown below.

// Use this online tool to generate code from sample JSON:
// Generate Code to Create JSON

json := CkJsonObject_Create();
CkJsonObject_UpdateString(json,'LanguageCode','string');
CkJsonObject_UpdateString(json,'TextList[0]','string');

// The JSON request body created by the above code:

// {
//   "LanguageCode": "string",
//   "TextList": [
//     "string"
//   ]
// }

CkRest_AddHeader(rest,'Content-Type','application/x-amz-json-1.1');
CkRest_AddHeader(rest,'X-Amz-Target','Comprehend_20171127.BatchDetectSentiment');

sbRequestBody := CkStringBuilder_Create();
CkJsonObject_EmitSb(json,sbRequestBody);
sbResponseBody := CkStringBuilder_Create();
success := CkRest_FullRequestSb(rest,'POST','/',sbRequestBody,sbResponseBody);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkRest__lastErrorText(rest));
    Exit;
  end;
respStatusCode := CkRest_getResponseStatusCode(rest);
Memo1.Lines.Add('response status code = ' + IntToStr(respStatusCode));
if (respStatusCode <> 200) then
  begin
    Memo1.Lines.Add('Response Header:');
    Memo1.Lines.Add(CkRest__responseHeader(rest));
    Memo1.Lines.Add('Response Body:');
    Memo1.Lines.Add(CkStringBuilder__getAsString(sbResponseBody));
    Exit;
  end;

jResp := CkJsonObject_Create();
CkJsonObject_LoadSb(jResp,sbResponseBody);

// The following code parses the JSON response.
// A sample JSON response is shown below the sample code.

// Use this online tool to generate parsing code from sample JSON:
// Generate Parsing Code from JSON

i := 0;
count_i := CkJsonObject_SizeOfArray(jResp,'ErrorList');
while i < count_i do
  begin
    CkJsonObject_putI(jResp,i);
    ErrorCode := CkJsonObject__stringOf(jResp,'ErrorList[i].ErrorCode');
    ErrorMessage := CkJsonObject__stringOf(jResp,'ErrorList[i].ErrorMessage');
    Index := CkJsonObject_IntOf(jResp,'ErrorList[i].Index');
    i := i + 1;
  end;

i := 0;
count_i := CkJsonObject_SizeOfArray(jResp,'ResultList');
while i < count_i do
  begin
    CkJsonObject_putI(jResp,i);
    Index := CkJsonObject_IntOf(jResp,'ResultList[i].Index');
    Sentiment := CkJsonObject__stringOf(jResp,'ResultList[i].Sentiment');
    Mixed := CkJsonObject_IntOf(jResp,'ResultList[i].SentimentScore.Mixed');
    Negative := CkJsonObject_IntOf(jResp,'ResultList[i].SentimentScore.Negative');
    Neutral := CkJsonObject_IntOf(jResp,'ResultList[i].SentimentScore.Neutral');
    Positive := CkJsonObject_IntOf(jResp,'ResultList[i].SentimentScore.Positive');
    i := i + 1;
  end;

// A sample JSON response body parsed by the above code:

// {
//   "ErrorList": [
//     {
//       "ErrorCode": "string",
//       "ErrorMessage": "string",
//       "Index": number
//     }
//   ],
//   "ResultList": [
//     {
//       "Index": number,
//       "Sentiment": "string",
//       "SentimentScore": {
//         "Mixed": number,
//         "Negative": number,
//         "Neutral": number,
//         "Positive": number
//       }
//     }
//   ]
// }

CkRest_Dispose(rest);
CkAuthAws_Dispose(authAws);
CkJsonObject_Dispose(json);
CkStringBuilder_Dispose(sbRequestBody);
CkStringBuilder_Dispose(sbResponseBody);
CkJsonObject_Dispose(jResp);