ReplaceGestalt

Replace the function associated with a selector

#include <GestaltEqu.h> Gestalt Manager

OSErr ReplaceGestalt( selector, selectorFunction , oldGestaltFunction );

OSType selector ; Gestalt selector code

ProcPtr selectorFunction ; address of new selector function

ProcPtr *oldGestaltFunction ; address of current selector function

returns Error Code; 0=no error

ReplaceGestalt lets your application replace the function currently

associated with a selector.

selector is the code that is about to have its function replaced(see

codes).

selectorFunction is the new function Gestalt will associate with the

selector.

oldGestaltFunction is the function currently associated with the selector and

about to be replaced

Returns: an operating system Error Code. It will be one of:

noErr (0) No error

gestaltUndefSelectorErr (-5551) Un defined selector

gestaltLocationErr (-5553) Function not in system heap

Notes: The new function must reside in the system heap and may want to call the

function previously associated with the named selector. It may do so by

using the address returned in the oldGestaltFunction.

Under THINK C 5.0 or later, THINK Pascal 4.0 or later and MPW 3.2 or

later, ReplaceGestalt will return an unimpErr on systems which do not

support the Gestalt Manager. If you are programming in assembly

language, it is necessary to check for the existence of the

Using the Gestalt Manager for more information on determining if the

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