IBM MQ从订阅队列中的消息获取主题名称

Question

I am using 'c-client' api to access the Websphere IBM MQ 8 . Is it possible to identify the source topic from which the message was published ?

Answer 1

To inquire on the topic string, use the MQCRTMH API call to obtain a message handle, then inquire the properties of the message using the MQINQMP API call specifying the MQTopicString property.

MQCRTMH - Create message handle
MQINQMP - Property Names
Sample IBM MQ procedural programs

Admittedly, it can be difficult to track this info down in the IBM MQ reference documentation, especially if you do not already know the way it works and the names of the calls and fields. One approach that can help is to start with the sample programs to get a basic understanding and then work back into the manuals to fill in the missing details. The sample code is available from the install media by selecting the appropriate optional component.

On Windows these end up in {MQM Home}/Tools and on UNIX systems at {MQM Home}/samp . If the samples are installed, AMQSIQMA will demonstrate how to inquire properties of a message handle, and is an example of the use of the MQINQMP API call.

Answer 2

To inquire on the topic string, use the MQCRTMH API call to obtain a message handle, then inquire the properties of the message using the MQINQMP API call specifying the MQTopicString property.

The correct message property name is 'mqps.Top' (case sensitive & no quotes).