3503 return wcs.err->status;
3506 In
this example,
if an error was generated in one of the
prjset() functions,
3507 wcsperr() would print an error traceback starting with
wcsset(), then
3508 celset(), and finally the particular projection-setting function that
3509 generated the error. For each of them it would print the status return value,
3510 function name, source file, line number, and an error message which may be
3511 more specific and informative than the general error messages reported in the
3512 first example. For example, in response to a deliberately generated error,
3513 the @c twcs test program, which tests
wcserr among other things, produces a
3514 traceback similar to this:
3516 ERROR 5 in
wcsset() at line 1564 of file wcs.c:
3517 Invalid parameter value.
3518 ERROR 2 in
celset() at line 196 of file cel.c:
3519 Invalid projection parameters.
3520 ERROR 2 in
bonset() at line 5727 of file prj.c:
3521 Invalid parameters for Bonne's projection.
3524 Each of the @ref structs "structs" in @ref overview "WCSLIB" includes a
3525 pointer, called @a err, to a
wcserr struct. When an error occurs, a struct is
3526 allocated and error information stored in it. The
wcserr pointers and the
3527 @ref memory "memory" allocated for them are managed by the routines that
3531 example above. If enabled, when an error occurs it is the user's
3532 responsibility to free the memory allocated for the error message using
3534 out of scope will result in memory leaks (if execution continues beyond the
int celfree(struct celprm *cel)
Destructor for the celprm struct.
int celset(struct celprm *cel)
Setup routine for the celprm struct.
int prjfree(struct prjprm *prj)
Destructor for the prjprm struct.
int bonset(struct prjprm *prj)
Set up a prjprm struct for Bonne's (BON) projection.
int prjset(struct prjprm *prj)
Generic setup routine for the prjprm struct.
Error message handling.
Definition: wcserr.h:220
int wcsfree(struct wcsprm *wcs)
Destructor for the wcsprm struct.
int wcsperr(const struct wcsprm *wcs, const char *prefix)
Print error messages from a wcsprm struct.
int wcsinit(int alloc, int naxis, struct wcsprm *wcs, int npvmax, int npsmax, int ndpmax)
Default constructor for the wcsprm struct.
int wcsset(struct wcsprm *wcs)
Setup routine for the wcsprm struct.
int wcserr_enable(int enable)
Enable/disable error messaging.
int wcsprintf_set(FILE *wcsout)
Set output disposition for wcsprintf() and wcsfprintf().