Chilkat Online Tools

DescribeChannel delphiDll Example

AWS IoT Analytics

var
rest: HCkRest;
success: Boolean;
authAws: HCkAuthAws;
sbResponseBody: HCkStringBuilder;
respStatusCode: Integer;
jResp: HCkJsonObject;
Arn: PWideChar;
CreationTime: Integer;
LastMessageArrivalTime: Integer;
LastUpdateTime: Integer;
Name: PWideChar;
NumberOfDays: Integer;
Unlimited: Integer;
Status: PWideChar;
Bucket: PWideChar;
KeyPrefix: PWideChar;
RoleArn: PWideChar;
EstimatedOn: Integer;
EstimatedSizeInBytes: 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','DescribeChannel');

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

Arn := CkJsonObject__stringOf(jResp,'channel.arn');
CreationTime := CkJsonObject_IntOf(jResp,'channel.creationTime');
LastMessageArrivalTime := CkJsonObject_IntOf(jResp,'channel.lastMessageArrivalTime');
LastUpdateTime := CkJsonObject_IntOf(jResp,'channel.lastUpdateTime');
Name := CkJsonObject__stringOf(jResp,'channel.name');
NumberOfDays := CkJsonObject_IntOf(jResp,'channel.retentionPeriod.numberOfDays');
Unlimited := CkJsonObject_IntOf(jResp,'channel.retentionPeriod.unlimited');
Status := CkJsonObject__stringOf(jResp,'channel.status');
Bucket := CkJsonObject__stringOf(jResp,'channel.storage.customerManagedS3.bucket');
KeyPrefix := CkJsonObject__stringOf(jResp,'channel.storage.customerManagedS3.keyPrefix');
RoleArn := CkJsonObject__stringOf(jResp,'channel.storage.customerManagedS3.roleArn');
EstimatedOn := CkJsonObject_IntOf(jResp,'statistics.size.estimatedOn');
EstimatedSizeInBytes := CkJsonObject_IntOf(jResp,'statistics.size.estimatedSizeInBytes');

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

// {
//   "channel": {
//     "arn": "string",
//     "creationTime": number,
//     "lastMessageArrivalTime": number,
//     "lastUpdateTime": number,
//     "name": "string",
//     "retentionPeriod": {
//       "numberOfDays": number,
//       "unlimited": boolean
//     },
//     "status": "string",
//     "storage": {
//       "customerManagedS3": {
//         "bucket": "string",
//         "keyPrefix": "string",
//         "roleArn": "string"
//       },
//       "serviceManagedS3": {}
//     }
//   },
//   "statistics": {
//     "size": {
//       "estimatedOn": number,
//       "estimatedSizeInBytes": number
//     }
//   }
// }

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