IupGetClassAttributeInfo

Returns the registered metadata of an attribute on a class: default value, system default, and flag bits.

Parameters/Return

int IupGetClassAttributeInfo(const char* classname, const char* name,
                             char** default_value, char** system_default, int* flags);

classname: name of the class.
name: attribute name.
default_value: registered default, internal string. NULL to ignore.
system_default: value used when the default was registered with the IUPAF_SAMEASSYSTEM sentinel. NULL to ignore.
flags: bitwise OR of the IUPAF_* flags below. NULL to ignore.

Returns: 1 if found, 0 if the class exists but the attribute is not registered (output values are zero-filled), -1 if the class is not registered.

Flags

Flag	Value	Meaning
IUPAF_DEFAULT	0	inheritable string with default, set/get only when mapped, no id
IUPAF_NO_INHERIT	1	not inheritable
IUPAF_NO_DEFAULTVALUE	2	cannot have a default value
IUPAF_NO_STRING	4	not a string (RGB, integer, Ihandle*, ...)
IUPAF_NOT_MAPPED	8	set/get also called when not mapped
IUPAF_HAS_ID	16	one numeric id appended to the name
IUPAF_READONLY	32	read only
IUPAF_WRITEONLY	64	write only (usually an action)
IUPAF_HAS_ID2	128	two numeric ids appended (line, column)
IUPAF_CALLBACK	256	entry is a callback, not an attribute
IUPAF_NO_SAVE	512	not directly savable by IupSaveClassAttributes
IUPAF_NOT_SUPPORTED	1024	declared but not supported by this driver
IUPAF_IHANDLENAME	2048	value is a name registered via IupSetHandle
IUPAF_IHANDLE	4096	value is an Ihandle*

String pointers are owned by IUP. Callbacks share the table with attributes; use IupGetClassCallbackFormat to read their signature.