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Constructing a military message

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In many cases military messages will be taken directly from the wire format and passed into the message class for processing. In some situations an application may need to create a message itself. You can create the message and then set each parameter individually or more simply use the AGSMPMessageHelper class.

Create a military message providing the key-value codes

Message contain properties that are used by the message processor to place a messge with the correct symbology at the correct location. Apart from the messageID, all of the properties can be defined using key-value coding. As a minimum you must ensure that you have set the messageID, _Type,_Action,_Control_Points and sic properties.

Note that the message can have a different spatial reference to the map. The message processor will reproject the message to the correct location. If the message does not set a _WKID then the messageprocessor will use the spatial reference of the map that contains the group layer.

AGSMPMessage* message = [[AGSMPMessage alloc] init];
message.messageId = @"ABC123";
[message setProperty:@"position_report" forKey:@"_Type"];
[message setProperty:@"update" forKey:@"_Action"];
[message setProperty:@"-220000,6600000" forKey:@"_Control_Points"];
[message setProperty:@"3857"  forKey:@"_WKID"];
[message setProperty:@"GFGPOPP-------X" forKey:@"sic"];
[message setProperty:@"1" forKey:@"UniqueDesignation"];
[mProcessor processMessage:message];

If you wish to locate the message above call the AGSMapView:zoomtoEnvelope method.

AGSEnvelope *envelope = 
 [AGSEnvelope envelopeWithXmin:-222000 ymin:6580000 xmax:-218000 ymax:6620000 
 spatialReference:[AGSSpatialReference spatialReferenceWithWKID:3857]];

[self.mapView zoomToEnvelope:envelope animated:YES];

Create a military message using the message helper class

Alternatively you can use the more explicit AGSMPMessageHelper class.

AGSPoint *point = [AGSPoint pointWithX:-220000 y:6600000 spatialReference:[AGSSpatialReference spatialReferenceWithWKID:3857]];
NSArray *messageControlPoints = [NSArray arrayWithObject:point];
NSMutableDictionary *messageProperties = [NSMutableDictionary dictionaryWithCapacity:2];
[messageProperties setObject:@"GFGPOPP-------X"forKey:@"sic"];
[messageProperties setObject:@"1" forKey:@"UniqueDesignation"];
AGSMPMessage* message = [[AGSMPMessage alloc] init];
message = [AGSMPMessageHelper mil2525CUpdateMessageWithId:@"ABC123"
spatialReference:[AGSSpatialReference spatialReferenceWithWKID:3857]];

[mProcessor processMessage:message];