Chilkat Online Tools

ListChannels delphiDll Example

AWS IoT Analytics

var
rest: HCkRest;
success: Boolean;
authAws: HCkAuthAws;
sbResponseBody: HCkStringBuilder;
respStatusCode: Integer;
jResp: HCkJsonObject;
channelName: PWideChar;
Bucket: PWideChar;
KeyPrefix: PWideChar;
RoleArn: PWideChar;
creationTime: Integer;
lastMessageArrivalTime: Integer;
lastUpdateTime: Integer;
status: PWideChar;
nextToken: PWideChar;
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,'iotanalytics');
// SetAuthAws causes Chilkat to automatically add the following headers: Authorization, X-Amz-Date
CkRest_SetAuthAws(rest,authAws);

// URL: https://iotanalytics.us-west-2.amazonaws.com/
// Use the same region as specified above.
success := CkRest_Connect(rest,'iotanalytics.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;

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

sbResponseBody := CkStringBuilder_Create();
success := CkRest_FullRequestNoBodySb(rest,'GET','/channels',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

nextToken := CkJsonObject__stringOf(jResp,'nextToken');
i := 0;
count_i := CkJsonObject_SizeOfArray(jResp,'channelSummaries');
while i < count_i do
  begin
    CkJsonObject_putI(jResp,i);
    channelName := CkJsonObject__stringOf(jResp,'channelSummaries[i].channelName');
    Bucket := CkJsonObject__stringOf(jResp,'channelSummaries[i].channelStorage.customerManagedS3.bucket');
    KeyPrefix := CkJsonObject__stringOf(jResp,'channelSummaries[i].channelStorage.customerManagedS3.keyPrefix');
    RoleArn := CkJsonObject__stringOf(jResp,'channelSummaries[i].channelStorage.customerManagedS3.roleArn');
    creationTime := CkJsonObject_IntOf(jResp,'channelSummaries[i].creationTime');
    lastMessageArrivalTime := CkJsonObject_IntOf(jResp,'channelSummaries[i].lastMessageArrivalTime');
    lastUpdateTime := CkJsonObject_IntOf(jResp,'channelSummaries[i].lastUpdateTime');
    status := CkJsonObject__stringOf(jResp,'channelSummaries[i].status');
    i := i + 1;
  end;

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

// {
//   "channelSummaries": [
//     {
//       "channelName": "string",
//       "channelStorage": {
//         "customerManagedS3": {
//           "bucket": "string",
//           "keyPrefix": "string",
//           "roleArn": "string"
//         },
//         "serviceManagedS3": {}
//       },
//       "creationTime": number,
//       "lastMessageArrivalTime": number,
//       "lastUpdateTime": number,
//       "status": "string"
//     }
//   ],
//   "nextToken": "string"
// }

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