nsIProperties in Firefox 3.5

Implemented by

@mozilla.org/persistent-properties;1
@mozilla.org/file/directory_service;1
@mozilla.org/properties;1
@mozilla.org/image/container;1

[scriptable, uuid(78650582-4e93-4b60-8e85-26ebd3eb14ca)]

Methods

 Gets a property with a given name. 

 @return NS_ERROR_FAILURE if a property with that name doesn't exist.
 @return NS_ERROR_NO_INTERFACE if the found property fails to QI to the 
 given iid.

void get(in string prop, in nsIIDRef iid, [iid_is(iid), retval] out nsQIResult result)

  Returns an array of the keys.

void getKeys(out PRUint32 count, [array, size_is(count), retval] out string keys)

 Returns true if the property with the given name exists.

boolean has(in string prop)

 Sets a property with a given name to a given value.

void set(in string prop, in nsISupports value)

 Undefines a property.
 @return NS_ERROR_FAILURE if a property with that name doesn't
 already exist.

void undefine(in string prop)