part is the part's handle to assign a name to.
name points to the zero-terminated name string.
The name string is copied into the part, thus the associated storage may safely be released or reused after call. Setting a part's name twice is valid: only the value set by the last call is retained. It is possible to "unname" a part by setting name to NULL.
curl_mime *mime; curl_mimepart *part; /* create a mime handle */ mime = curl_mime_init(easy); /* add a part */ part = curl_mime_addpart(mime); /* give the part a name */ curl_mime_name(part, "shoe_size");