Jlia Jlia - 1 month ago 12
iOS Question

Objective-C RabbitMQ client not publishing messages to queue

I am trying to make a messaging application using, RabbitMQ for iOS.
and i am using this wrapper classes for objective c, with RabbitMQ-C client libraries.

https://github.com/profmaad/librabbitmq-objc

Exchange, Queue & Queue Binding all are ok but my code is not publishing message to RabbitMQ server. Please help me , what is the problem?

this is my code:

NSError *error= nil;

AMQPConnection *connection = [[AMQPConnection alloc] init];

[connection connectToHost:@"SERVER_NAME" onPort:PORT error:&error];

if (error != nil){
NSLog(@"Error connection: %@", error);
return;
}

[connection loginAsUser:@"USER_NAME" withPasswort:@"PASSWORD" onVHost:@"/" error:&error];

if (error != nil){
NSLog(@"Error logined: %@", error);
return;
}

AMQPChannel *channel = [connection openChannel];


AMQPExchange *exchange = [[AMQPExchange alloc] initFanoutExchangeWithName:@"EXCHANGE_NAME" onChannel:channel isPassive:NO isDurable:NO getsAutoDeleted:NO error:&error];

if (error != nil){
NSLog(@"Error declareExchange: %@", error);
return;
}



//AMQPQueue *queue = [[AMQPQueue alloc] initWithName:@"NAME" onChannel:channel isPassive:NO isExclusive:NO isDurable:YES getsAutoDeleted:YES error:&error];
AMQPQueue *queue = [[AMQPQueue alloc] initWithName:@"NAME" onChannel:[connection openChannel]];
if (error != nil){
NSLog(@"Error declare Queue: %@", error);
return;
}



NSError *error ;
[queue bindToExchange:exchange withKey:@"KEY" error:&error];

amqp_basic_properties_t props;
props._flags= AMQP_BASIC_CLASS;
props.type = amqp_cstring_bytes([@"typeOfMessage" UTF8String]);
props.priority = 1;
[exchange publishMessage:@"Test message" usingRoutingKey:@"ROUTING_KEY" propertiesMessage:props mandatory:NO immediate:NO error:&error];
if (error != nil){
NSLog(@"Error declareExchange: %@", error);
return;
}

Answer

I searched allot as I am too implementing this type of app, at many places I found library that have many types of errors while implementing with iPhone application. I know you have solved your problem but this answer is for those who are still suffering. I combined libs of rabbitmq-c and obejective-c wrapper , erase issues and store it at my own place. You can have rabbitmq-lib for Objective-C development given link.

https://dl.dropboxusercontent.com/u/75870052/AMQPLib.zip

Include this library, import files as given below:-

#import "AMQPExchange.h"
#import "AMQPConsumer.h"
#import "AMQPConnection.h"
#import "AMQPConsumerThread.h"
#import "AMQPChannel.h"
#import "AMQPQueue.h"
#import "AMQPMessage.h"

Define your credentials, I have used default.

#define host @"localhost"
#define routingQueue @"CreateQueue"
#define port 5672
#define user @"guest"
#define pass @"guest"

For publishing message on server use following method.

- (IBAction)send:(id)sender {

    NSError *error= nil;
    NSError *error2 = nil;
    NSError *error3 = nil;
    NSError *error4 = nil;

    AMQPConnection *connection = [[AMQPConnection alloc] init];
    [connection connectToHost:host onPort:port error:&error];

    if (error != nil){
        NSLog(@"Error connection: %@", error);
        return;
    }

    [connection loginAsUser:user withPasswort:pass onVHost:@"/" error:&error];

    if (error != nil){
        NSLog(@"Error logined: %@", error);
        return;
    }


    AMQPChannel *channel = [connection openChannelError:&error2];

    AMQPExchange *exchange = [[AMQPExchange alloc] initDirectExchangeWithName:@"AMQP" onChannel:channel isPassive:NO isDurable:NO getsAutoDeleted:NO error:&error];


    if (error != nil){
        NSLog(@"Error declareExchange: %@", error);
        return;
    }


    AMQPQueue *queue = [[AMQPQueue alloc] initWithName:routingQueue onChannel:channel error:&error3];
    if (error != nil){
        NSLog(@"Error declare Queue: %@", error);
        return;
    }


    BOOL success = [queue bindToExchange:exchange withKey:routingQueue error:&error4];

    if (success) {
        amqp_basic_properties_t props;
        props._flags = AMQP_BASIC_CONTENT_TYPE_FLAG | AMQP_BASIC_DELIVERY_MODE_FLAG;
        props.content_type = amqp_cstring_bytes("text/plain");
        props.delivery_mode = 2;
        props.priority = 1;

        //Here put your message to publish...

        [exchange publishMessage:@"YOUR MESSAGE" usingRoutingKey:routingQueue propertiesMessage:props mandatory:NO immediate:NO error:&error];

        if (error != nil){
            NSLog(@"Error declareExchange: %@", error);
            return;
        }
    }
}

For receiving message, you need delegate.

-(IBAction)receiveMessage:(id)sender
{
    NSError *error= nil;
    NSError *error2 = nil;
    NSError *error3 = nil;
    NSError *error4 = nil;

    AMQPConnection *connection = [[AMQPConnection alloc] init];
    [connection connectToHost:host onPort:port error:&error];
    [connection loginAsUser:user withPasswort:pass onVHost:@"/" error:&error];

    AMQPChannel *channel = [connection openChannelError:&error2];
    AMQPQueue *queue = [[AMQPQueue alloc] initWithName:routingQueue onChannel:channel isPassive:NO isExclusive:NO isDurable:NO getsAutoDeleted:NO error:&error3];

    AMQPConsumer *consumer = [[AMQPConsumer alloc] initForQueue:queue onChannel:&channel useAcknowledgements:YES isExclusive:NO receiveLocalMessages:NO error:&error4 deepLoop:1];

    AMQPConsumerThread *consumerThread = [[AMQPConsumerThread alloc] initWithConsumer:consumer delegate:self nameThread:@"myThread" persistentListen:NO];

    consumerThread.delegate=self;

    [consumerThread start];
}


-(void)amqpConsumerThreadReceivedNewMessage:(AMQPMessage *)theMessage
{
    NSLog(@"message = %@", theMessage.body);
}
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