int Tk_GetPixels(interp, tkwin, string, intPtr)
int Tk_GetScreenMM(interp, tkwin, string, doublePtr)
Tcl_Interp *interp
(in) Tk_Window tkwin
(in) char *string
(in) int *intPtr
(out) double *doublePtr
(out) These two procedures take as argument a specification of distance on the screen (string) and compute the corresponding distance either in integer pixels or floating-point millimeters. In either case, string specifies a screen distance as a floating-point number followed by one of the following characters that indicates units:
Tk_GetPixels converts string to the nearest even number of pixels and stores that value at *intPtr. Tk_GetScreenMM converts string to millimeters and stores the double-precision floating-point result at *doublePtr.
Both procedures return TCL_OK under normal circumstances. If an error occurs (e.g. string contains a number followed by a character that isn't one of the ones above) then TCL_ERROR is returned and an error message is left in interp->result.