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OSX 10.14 Mojave - man page for tk_nameofanchor (mojave section 3)

Tk_GetAnchorFromObj(3)					       Tk Library Procedures					    Tk_GetAnchorFromObj(3)

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NAME
Tk_GetAnchorFromObj, Tk_GetAnchor, Tk_NameOfAnchor - translate between strings and anchor positions
SYNOPSIS
#include <tk.h> int Tk_GetAnchorFromObj(interp, objPtr, anchorPtr) int Tk_GetAnchor(interp, string, anchorPtr) const char * Tk_NameOfAnchor(anchor)
ARGUMENTS
Tcl_Interp *interp (in) Interpreter to use for error reporting, or NULL. Tcl_Obj *objPtr (in/out) String value contains name of anchor point: "n", "ne", "e", "se", "s", "sw", "w", "nw", or "center"; internal rep will be modified to cache corresponding Tk_Anchor. const char *string (in) Same as objPtr except description of anchor point is passed as a string. int *anchorPtr (out) Pointer to location in which to store anchor position corresponding to objPtr or string. Tk_Anchor anchor (in) Anchor position, e.g. TCL_ANCHOR_CENTER. _________________________________________________________________
DESCRIPTION
Tk_GetAnchorFromObj places in *anchorPtr an anchor position (enumerated type Tk_Anchor) corresponding to objPtr's value. The result will be one of TK_ANCHOR_N, TK_ANCHOR_NE, TK_ANCHOR_E, TK_ANCHOR_SE, TK_ANCHOR_S, TK_ANCHOR_SW, TK_ANCHOR_W, TK_ANCHOR_NW, or TK_ANCHOR_CENTER. Anchor positions are typically used for indicating a point on an object that will be used to position the object, e.g. TK_ANCHOR_N means position the top center point of the object at a particular place. Under normal circumstances the return value is TCL_OK and interp is unused. If string does not contain a valid anchor position or an abbreviation of one of these names, TCL_ERROR is returned, *anchorPtr is unmodified, and an error message is stored in interp's result if interp is not NULL. Tk_GetAnchorFromObj caches information about the return value in objPtr, which speeds up future calls to Tk_GetAnchor- FromObj with the same objPtr. Tk_GetAnchor is identical to Tk_GetAnchorFromObj except that the description of the anchor is specified with a string instead of an object. This prevents Tk_GetAnchor from caching the return value, so Tk_GetAnchor is less efficient than Tk_GetAnchorFromObj. Tk_NameOfAnchor is the logical inverse of Tk_GetAnchor. Given an anchor position such as TK_ANCHOR_N it returns a statically-allocated string corresponding to anchor. If anchor is not a legal anchor value, then "unknown anchor position" is returned.
KEYWORDS
anchor position Tk 8.1 Tk_GetAnchorFromObj(3)

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