# get\_first\_member ``` get offset of the first member of a structure id - structure type ID returns: -1 if bad structure type ID is passed or structure has no members otherwise returns offset of the first member. NOTE: IDA allows 'holes' between members of a structure. It treats these 'holes' as unnamed arrays of bytes. NOTE: Union members are, in IDA's internals, located at subsequent byte offsets: member 0 -> offset 0x0, member 1 -> offset 0x1, etc... long get_first_member(long id); ``` --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.hex-rays.com/9.0/developer-guide/idc/idc-api-reference/alphabetical-list-of-idc-functions/384.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.