Class CCommandLineArguments

class CCommandLineArguments : public CBase;

Description

Parses command line arguments.

The class provides functions to access the arguments that are supplied when a program is launched as a new process.

The program name is returned as argument 0. Other arguments are returned as arguments 1, 2 etc.

The Count() function indicates how many arguments there are, including the program name. Arguments may be quoted to contain blanks and quotes.

The command line arguments and process name occupy 256 characters each. In order to minimise the space used throughout the lifetime of a program, it is recommended that the program parse the arguments shortly after initialisation, save the argument values appropriately, and then destroy the CCommandLineArguments object.

The main use of this class is in parsing the arguments of WINC command-line utilities.

This class is not intended for user derivation

Derivation

• CBase - Base class for all classes to be instantiated on the heap

• CCommandLineArguments - Parses command line arguments

Members

Defined in CCommandLineArguments:
Arg(), Count(), NewL(), NewLC(), ~CCommandLineArguments()

Inherited from CBase:
Delete(), Extension_(), operator new()

static IMPORT_C CCommandLineArguments *NewLC();

Description

Allocates and constructs a command line arguments parser, putting the returned pointer onto the cleanup stack. The function leaves if there is insufficient memory.

Return value

CCommandLineArguments * The command line arguments parser.

static IMPORT_C CCommandLineArguments *NewL();

Description

Allocates and constructs a command line arguments parser. The function leaves if there is insufficient memory.

Return value

CCommandLineArguments * The command line arguments parser.

IMPORT_C ~CCommandLineArguments();

Description

Frees resources prior to destruction.

IMPORT_C TPtrC Arg(TInt aArg) const;

Description

Returns a non-modifiable pointer descriptor representing the specified command-line argument.

Arg(0) is the file name as specified on the command line. Arg(1), Arg(2) etc. are the arguments specified to the command.

The pointer descriptor is valid throughout the lifetime of the CCommandLineArguments object. If you wish to retain argument values after the CCommandLineArguments object is destroyed, you should copy the argument data into a different object.

Parameters

TInt aArg The index of the desired argument. This number must be less than Count(). Specify 0 for the name used to invoke the process. Specify 1, 2 etc. for the arguments.

Return value

TPtrC Non-modifiable pointer descriptor to the specified argument text.

IMPORT_C TInt Count() const;

Description

Returns the number of command line arguments, including the program name.

Return value

TInt The number of command line arguments, plus one for the program name. Returns 1, if no arguments are specified.