\func{wxString}{GetHeader}{\param{const wxString\&}{ header}}
Returns the data attached with a field whose name is specified by \it{header}.
If the field doesn't exist, it will return an empty string and not a NULL string.
\func{wxString}{GetHeader}{\param{const wxString\&}{ header}}
Returns the data attached with a field whose name is specified by \it{header}.
If the field doesn't exist, it will return an empty string and not a NULL string.