Opens a file for writing in the preferred directory for temporary files (as returned by get_tmp_dir).
tmpl should be a string in the GLib file name encoding containing a sequence of six 'X' characters, as the parameter to
mkstemp. However, unlike these functions, the template should only be a
basename, no directory components are allowed. If template is null, a default template is used.
Upon success, and if
name_used is non-null, the actual name used is returned in
. This string should be freed with g_free when not needed any longer. The returned
name is in the GLib file name encoding.
Template for file name, as in mkstemp, basename only, or null for a default template
location to store actual name used, or null
A file handle (as from open) to the file opened for reading and writing. The file is opened in binary mode on platforms where there is a difference. The file handle should be closed with close. In case of errors, -1 is returned and throws will be set.