OEParseCommandLineLW

bool OEParseCommandLineLW(OEInterface &itf,
                          int argc,
                          char **argv,
                          const unsigned char *requirements=NULL,
                          unsigned int error_level=OEErrorLevel::Error)
bool OEParseCommandLineLW(OEInterface &itf,
                          const char *version,
                          int argc,
                          char **argv,
                          const unsigned char *requirements=NULL,
                          unsigned int error_level=OEErrorLevel::Error)

Set parameters in the ‘itf’ object by parsing the command line, ‘argc’ and ‘argv’. This is the same purpose as OEParseCommandLine, however, this function has different rules for parsing the command line, most notably nothing is entered as a key-value pair, and is in general designed for small lightweight interfaces, hence the LW in the function name.

The version argument specifies what should be printed whenever the --version is found in argv.

When using this function all parameters of itf must fall into one of two categories.

• A boolean parameter with a default value of false and a name beginning with a dash followed by a single character.

• A keyless parameter (i.e. a parameter with a non-zero keyless value).

and the command line should be of the following form.

program [boolean parameter keys] [keyless parameter values]

boolean parameter keys

Boolean parameters with keys listed listed in this part of the command line will be set to true (those not appearing will use their default value which must be false). The characters of the boolean keys may also be combined into a single argument on the command line. This is easiest to illustrate in the following example:

program -a -b -c [keyless parameter values]

and

program -abc [keyless parameter values]

and

program -c -ba [keyless parameter values]

Are all equivalent, provided ‘-a’, ‘-b’ and ‘-c’ are boolean parameters with default values of false.

keyless parameter values

The first argument not recognized as a boolean parameter will be assigned as the value of the parameter with a keyless value of 1, the second to the parameter with keyless value of 2, etc. If no parameter have the appropriate keyless value, or more than one have the required keyless value are error is reported, and the function returns false.

This function returns true if it was successful and false otherwise. Errors are reported at ‘error_level’ to OEThrow.