Objective-C

Azure Service Bus - Read Queued Message

See more Azure Service Bus Examples

Demonstrates read a message from an Azure Service Bus Queue. The message is received and removed from the queue. Objective-C

#import <CkoRest.h>
#import <NSString.h>
#import <CkoStringBuilder.h>

BOOL success = NO;

//  Note: Requires Chilkat v9.5.0.65 or greater.

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

//  Make the initial connection.
//  A single REST object, once connected, can be used for many Azure Service Bus REST API calls.
//  The auto-reconnect indicates that if the already-established HTTPS connection is closed,
//  then it will be automatically re-established as needed.
CkoRest *rest = [[CkoRest alloc] init];
BOOL bAutoReconnect = YES;
success = [rest Connect: @"<yournamespace>.servicebus.windows.net" port: [NSNumber numberWithInt: 443] tls: YES autoReconnect: bAutoReconnect];
if (success != YES) {
    NSLog(@"%@",rest.LastErrorText);
    return;
}

//  ----------------------------------------------------------------------------------------------
//  The code above this comment could be placed inside a function/subroutine within the application
//  because the connection does not need to be made for every request.  Once the connection is made
//  the app may send many requests..
//  ----------------------------------------------------------------------------------------------

//  Receive and delete a message from a queue named "gila";
NSString *queueName = @"gila";

//  Let's load a previously computed SAS token and use it.
//  See Azure Shared Access Signature for an example to genenerate an Azure SAS token.
CkoStringBuilder *sbToken = [[CkoStringBuilder alloc] init];
[sbToken LoadFile: @"qa_data/tokens/serviceBusSas.txt" charset: @"utf-8"];

//  Tell the REST object to use the Azure Shared Access Signature for authorization.
[sbToken Prepend: @"SharedAccessSignature "];
[rest AddHeader: @"Authorization" value: [sbToken GetAsString]];

//  Build the path..
CkoStringBuilder *sbPath = [[CkoStringBuilder alloc] init];
[sbPath Append: @"/"];
[sbPath Append: queueName];
[sbPath Append: @"/messages/head"];

//  Add timeout and api-version query parameters.
[rest AddQueryParam: @"timeout" value: @"20"];
[rest AddQueryParam: @"api-version" value: @"2013-08"];

//  Use the DELETE HTTP verb to read the message at the head of the queue and remove it.
CkoStringBuilder *sbResponseBody = [[CkoStringBuilder alloc] init];
success = [rest FullRequestNoBodySb: @"DELETE" uriPath: [sbPath GetAsString] sb: sbResponseBody];
if (success != YES) {
    NSLog(@"%@",rest.LastErrorText);
    return;
}

NSLog(@"%@%d",@"Response Status Code = ",[rest.ResponseStatusCode intValue]);

//  Check for a success response.
if ([rest.ResponseStatusCode intValue] != 200) {
    NSLog(@"%@",rest.LastRequestStartLine);
    NSLog(@"%@",rest.LastRequestHeader);
    NSLog(@"%@",[sbResponseBody GetAsString]);
    NSLog(@"%@",@"Failed.");
    return;
}

//  If successful, the message is the contents of the response body.
NSString *message = [sbResponseBody GetAsString];
NSLog(@"%@%@",@"Dequeued message: ",message);

NSLog(@"%@",@"Success.");