part is the part's handle to assign the remote file name to.
filename points to the null-terminated file name string; it may be set to NULL to remove a previously attached remote file name.
The remote file name string is copied into the part, thus the associated storage may safely be released or reused after call. Setting a part's file name twice is valid: only the value set by the last call is retained.
curl_mime *mime; curl_mimepart *part; /* create a mime handle */ mime = curl_mime_init(easy); /* add a part */ part = curl_mime_addpart(mime); /* send image data from memory */ curl_mime_data(part, imagebuf, imagebuf_len); /* set a file name to make it look like a file upload */ curl_mime_filename(part, "image.png"); /* set name */ curl_mime_name(part, "data");