work with config files written in rfc.zeromq.org/spec:4/ZPL. Create new config item Destroy a config item and all its children Create copy of zconfig, caller MUST free the value Create copy of config, as new zconfig object. Returns a fresh zconfig_t object. If config is null, or memory was exhausted, returns null. Return name of config item Return value of config item Insert or update configuration key with value Equivalent to zconfig_put, accepting a format specifier and variable argument list, instead of a single string value. Get value for config item into a string value; leading slash is optional and ignored. Set config item name, name may be NULL Set new value for config item. The new value may be a string, a printf format, or NULL. Note that if string may possibly contain '%', or if it comes from an insecure source, you must use '%s' as the format, followed by the string. Find our first child, if any Find our first sibling, if any Find a config item along a path; leading slash is optional and ignored. Locate the last config item at a specified depth Execute a callback for each config item in the tree; returns zero if successful, else -1. Add comment to config item before saving to disk. You can add as many comment lines as you like. If you use a null format, all comments are deleted. Return comments of config item, as zlist. Load a config tree from a specified ZPL text file; returns a zconfig_t reference for the root, if the file exists and is readable. Returns NULL if the file does not exist. Save a config tree to a specified ZPL text file, where a filename "-" means dump to standard output. Equivalent to zconfig_load, taking a format string instead of a fixed filename. Equivalent to zconfig_save, taking a format string instead of a fixed filename. Report filename used during zconfig_load, or NULL if none Reload config tree from same file that it was previously loaded from. Returns 0 if OK, -1 if there was an error (and then does not change existing data). Load a config tree from a memory chunk Save a config tree to a new memory chunk Load a config tree from a null-terminated string Save a config tree to a new null terminated string Return true if a configuration tree was loaded from a file and that file has changed in since the tree was loaded. Destroy subtree (all children) Destroy node and subtree (all children) Print the config file to open stream Print properties of object Self test of this class