The DBC file format is a proprietary file format, so I'm not sure how to extract this information. You can open a DBC file with a text editor and find your node's name and possibly find how to extract the messages that are associated with it.
You could also use the NI-XNET API to parse the file for you. NI-XNET is a free driver for NI-XNET hardware, but it can also be used to parse DBC and Fibex files. You can use the C, CVI or LabVIEW API. Here is an example of what you want to do in LabVIEW: