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harbour-core/harbour/doc/en/misc.txt

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/*
* $Id$
*/
/*
* The following parts are Copyright of the individual authors.
* www - http://www.harbour-project.org
*
* Copyright 2000 Chen Kedem <niki@actcom.co.il>
* Documentation for: TONE()
*
* See doc/license.txt for licensing terms.
*
*/
/* $DOC$
* $FUNCNAME$
* OS()
* $ONELINER$
* Return the current operating system.
* $SYNTAX$
* OS() --> <cOperatingSystem>
* $CATEGORY$
* DOS
* $RETURNS$
* <cOperatinSystem> The Current operating system.
* $DESCRIPTION$
* This function will return the current operating system.
* $EXAMPLES$
* ? OS()
* $TESTS$
* $STATUS$
* R
* $COMPLIANCE$
* This function is CA-Clipper compatible.
* $PLATFORMS$
* All
* $FILES$
* source/rtl/version.c
* $END$
*/
/* $DOC$
* $FUNCNAME$
* VERSION()
* $CATEGORY$
* Environment
* $ONELINER$
* Returns the HARBOUR Version or the Harbour/Compiler Version.
* $SYNTAX$
* VERSION() --> <cReturn>
* $ARGUMENTS$
* None
* $RETURNS$
* <cReturn> String containing the Harbour Version
* $DESCRIPTION$
* This function returns the current Harbour Version.
* $EXAMPLES$
* ? QOUT(VERSION())
* "Harbour Terminal: Standard stream console"
*
* $TESTS$
* $STATUS$
* S
* $COMPLIANCE$
* This function is Ca-Clipper compatible.
* $PLATFORMS$
* All
* $FILES$
* source/rtl/version.c
* Library is rtl
* $SEEALSO$
* OS()
* $END$
*/
/* $DOC$
* $FUNCNAME$
* GETENV()
* $CATEGORY$
* Environment
* $ONELINER$
* Obtains system environmental settings.
* $SYNTAX$
* GETENV(<cEnviroment>, <cDefaultValue> ) --> <cReturn>
* $ARGUMENTS$
* <cEnviroment> Enviromental variable to obtain.
*
* <cDefaultValue> Optional value to return if <cEnvironment> is not found.
* $RETURNS$
* <cReturn> Value of the Environment Variable.
* $DESCRIPTION$
* This function yields a string that is the value of the
* environment variable <cEnviroment>, which is stored at the
* system level with the Set command. If no environment variable
* can be found, the value of the function will be <cDefaultValue>
* if it is passed, else an empty string.
* $EXAMPLES$
* ? QOUT(GETENV('PATH'))
* ? QOUT(GETENV('CONFIG'))
* ? QOUT(GETENV('HARBOURCMD', '-n -l -es2'))
* </fixed>
* $TESTS$
* $STATUS$
* R
* $COMPLIANCE$
* This command is Ca-Clipper compliant.
* The <cDefaultValue> parameter is a Harbour extension.
* $PLATFORMS$
* All
* $FILES$
* source/rtl/gete.c
* Library is rtl
* $END$
*/
/* $DOC$
* $FUNCNAME$
* __RUN()
* $CATEGORY$
* DOS
* $ONELINER$
* Run an external program.
* $SYNTAX$
* __RUN( <cCommand> )
* $ARGUMENTS$
* <cCommand> Command to execute.
* $DESCRIPTION$
* This command runs an external program. Please make sure that
* you have enough free memory to be able to run the external
* program. Do not use it to run Terminate and Stay Resident programs
* (in case of DOS) since that causes several problems.
*
* Note: This function is what the RUN command preprocesses into.
* It is considered bad form to use this function directly.
* Use the RUN command instead.
* $EXAMPLES$
* __Run( "edit " + cMyTextFile ) // Runs an external editor
* __Run( "command" ) // Gives a DOS shell (DOS only)
* </fixed>
* $TESTS$
* $STATUS$
* R
* $COMPLIANCE$
* This function is Ca-Clipper compliant.
* $PLATFORMS$
* All
* $FILES$
* source/rtl/run.c
* Library is rtl
* $SEEALSO$
* RUN
* $END$
*/
/* $DOC$
* $FUNCNAME$
* TONE()
* $CATEGORY$
* Miscellaneous
* $ONELINER$
* Sound a tone with a specified frequency and duration.
* $SYNTAX$
* TONE( <nFrequency>, <nDuration> ) --> NIL
* $ARGUMENTS$
* <nFrequency> A non-negative numeric value that specifies the
* frequency of the tone in hertz.
*
* <nDuration> A positive numeric value which specifies the duration
* of the tone in 1/18 of a second units.
* $RETURNS$
* TONE() always returns NIL.
* $DESCRIPTION$
* TONE() is a sound function that could be used to irritate the end
* user, his or her dog, and the surrounding neighborhood. The frequency
* is clamped to the range 0 to 32767 Hz.
* $EXAMPLES$
* If lOk // Good Sound
* TONE( 500, 1 )
* TONE( 4000, 1 )
* TONE( 2500, 1 )
* Else // Bad Sound
* TONE( 300, 1 )
* TONE( 499, 5 )
* TONE( 700, 5 )
* EndIf
* </fixed>
* $TESTS$
* TONE( 800, 1 ) // same as ? CHR(7)
* TONE( 32000, 200 ) // any dogs around yet?
* TONE( 130.80, 1 ) // musical note - C
* TONE( 400, 0 ) // short beep
* TONE( 700 ) // short beep
* TONE( 10, 18.2 ) // 1 second delay
* TONE( -1 ) // 1/18.2 second delay
* TONE( ) // 1/18.2 second delay
* </fixed>
* $TESTS$
* $STATUS$
* S
* $COMPLIANCE$
* TONE() works exactly like CA-Clipper's TONE().
* $PLATFORMS$
* All
* $FILES$
* Library is rtl
* $SEEALSO$
* CHR(),SET BELL
* $END$
*/
/* $DOC$
* $FUNCNAME$
* RUN
* $CATEGORY$
* Command
* $ONELINER$
* Run an external program.
* $SYNTAX$
* RUN <cCommand>
* $ARGUMENTS$
* <cCommand> Command to execute.
* $DESCRIPTION$
* This command runs an external program. Please make sure that you have
* enough free memory to be able to run the external program.
* Do not use it to run Terminate and Stay Resident programs
* (in case of DOS) since that causes several problems.
* $EXAMPLES$
* Run "edit " + cMyTextFile // Runs an external editor
* Run "command" // Gives a DOS shell (DOS only)
* $TESTS$
* $STATUS$
* R
* $COMPLIANCE$
* This command is Ca-Clipper compliant.
* $PLATFORMS$
* All
* $FILES$
* source/rtl/run.c
* Library is rtl
* $SEEALSO$
* RUN
* $END$
*/