help with C, argv

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tk_getscrollinfoobj

Tk_GetScrollInfo(3)					       Tk Library Procedures					       Tk_GetScrollInfo(3)

__________________________________________________________________________________________________________________________________________________

NAME

       Tk_GetScrollInfo, Tk_GetScrollInfoObj - parse arguments for scrolling commands

SYNOPSIS

       #include <tk.h>

       int
       Tk_GetScrollInfo(interp, argc, argv, dblPtr, intPtr)

       int
       Tk_GetScrollInfoObj(interp, objc, objv, dblPtr, intPtr)

ARGUMENTS

       Tcl_Interp *interp (in)		Interpreter to use for error reporting.

       int argc (in)			Number of strings in argv array.

       const char *argv[] (in)		Argument  strings.   These  represent  the entire widget command, of which the first word is typically the
					widget name and the second word is typically xview or yview.

       int objc (in)			Number of Tcl_Obj's in objv array.

       Tcl_Obj *const objv[] (in)	Argument objects.  These represent the entire widget command, of which the first  word	is  typically  the
					widget name and the second word is typically xview or yview.

       double *dblPtr (out)		Filled in with fraction from moveto option, if any.

       int *intPtr (out)		Filled in with line or page count from scroll option, if any.  The value may be negative.
_________________________________________________________________

DESCRIPTION

       Tk_GetScrollInfo  parses the arguments expected by widget scrolling commands such as xview and yview.  It receives the entire list of words
       that make up a widget command and parses the words starting with argv[2].  The words starting with argv[2] must have one of  the  following
       forms:
	      moveto fraction
	      scroll number units
	      scroll number pages

       Any  of	the  moveto,  scroll,  units, and pages keywords may be abbreviated.  If argv has the moveto form, TK_SCROLL_MOVETO is returned as
       result and *dblPtr is filled in with the fraction argument to the command, which must be a proper real value.  If argv has the scroll form,
       TK_SCROLL_UNITS or TK_SCROLL_PAGES is returned and *intPtr is filled in with the number value, which must be a proper integer.  If an error
       occurs in parsing the arguments, TK_SCROLL_ERROR is returned and an error message is left in interp->result.

       Tk_GetScrollInfoObj is identical in function to Tk_GetScrollInfo.  However, Tk_GetScrollInfoObj accepts Tcl_Obj style arguments, making	it
       more appropriate for use with new development.

KEYWORDS

       parse, scrollbar, scrolling command, xview, yview

Tk									8.0						       Tk_GetScrollInfo(3)

Programming