05-28-2007
Command line args
My program usage takes the form for example;
$ theApp 2 "one or more words"
i.e. 3 command line arguments; application name, an integer, some text
My code includes the following 4 lines:
int anInteger;
char words[80];
sscanf(argv[1], "%d", &anInteger);
sscanf(argv[2], "%s", &message);
Based on th example execution shown above this code results in th following assignments:
anInterger = 2 /* correct and as I thought*/
message = one /* not as I thought or intended*/
I thought when I printed out the value of message I would get:
one or more words
but instead I get:
one
I have done a test and the use of the " " marks seems to make "one or more words" be seen as a single argument. If I don't use the " " marks it sees every word as another argument.
So even though the program sees "one or more words" as a single argument, sscanf is not reading it properly. How can I overcome this problem?
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LEARN ABOUT SUSE
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)