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: http://www.stsci.edu/~sontag/spicedocs/cspice/getmsg_c.html
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Retrieve the current short error message, the explanation of the short error message, or the long error message.
ERROR
VARIABLE I/O DESCRIPTION -------- --- -------------------------------------------------- option I Indicates type of error message. lenout I Available space in the output string msg. msg O The error message to be retrieved.
option Indicates the type of error message to be retrieved. The choices are: The current short error message, the explanation of the short error message, or the current long error message. Possible values of option are: "SHORT" -- indicates that the short message is to be retrieved "EXPLAIN" -- indicates that the explanation of the short message is to be retrieved "LONG" -- indicates that the long message is to be retrieved The input strings indicating the choice of option may be in mixed case. For example, there is no problem with the call, getmsg_c ( "loNg", MSGLEN, msg ); lenout is the maximum allowed length of the output message string, including the terminating null character. For example, if the caller wishes to be able to accept an 1840-character message, lenout must be set to (at least) 1841. The current maximum long error message length is in fact 1840 characters.
msg is the error message to be retrieved. Its value depends on option, and on whether an error condition exists. When there is no error condition, msg is empty. If an error condition does exist, When option is "SHORT" -- msg is the current short error message. This is a very condensed, 25-character description of the error. "EXPLAIN" -- msg is the explanation of the current short error message. This is a one-line expansion of the text of the short message. Most CSPICE short error messages have corresponding explanation text. For other short error messages, if there is no explanation text, msg will be blank. "LONG" -- msg is the current long error message. The long error message is a detailed explanation of the error, possibly containing data specific to the particular occurrence of the error. Not all errors have long error messages. If there is none, msg will be empty. Long error messages are no longer than 320 characters. invalid -- msg will remain unchanged from its value on input.
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Please read the "required reading" first! A good time to call this routine would be when an error condition exists, as indicated by the CSPICE function, failed_c.
Here's an example of a real-life call to getmsg_c to get the explanation of the current short error message. In this example, a CSPICE routine, ckopn_c, is called. Following the return from ckopn_c, the logical function, failed_c, is tested to see whether an error occurred. If it did, the message is retrieved and output via a user-defined output routine: #include "SpiceUsr.h" #include <stdio.h> #define MSGLEN 1841 SpiceChar msg [ MSGLEN ]; . . . /. We call ckopn_c; then test for errors... ./ ckopn_c ( filename, ifname, ncomch, &handle ); if ( failed_c() ) { /. Get explanation text for the current short message and print it: ./ getmsg_c ( "EXPLAIN", MSGLEN, msg ); [Output message] . . . }
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1) If the input string option is invalid, the error SPICE(INVALIDMSGTYPE) will be signaled. In that case no message is returned; msg retains the value it had on input. 2) The error SPICE(NULLPOINTER) is signaled if either string pointer argument is null. 3) The caller must pass a value indicating the length of the output string. If this value is not at least 2, the error SPICE(STRINGTOOSHORT) is signaled. This routine is part of the interface to the CSPICE error handling mechanism. For this reason, this routine does not participate in the trace scheme, even though it has external references.
None.
N.J. Bachman (JPL)
None.
-CSPICE Version 1.0.0, 5-APR-1999 (NJB)
get error message