Difference between revisions of "OPEN"

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''Modes:'' Open can use 5 different access modes:  
 
''Modes:'' Open can use 5 different access modes:  
  
   [[OUTPUT]]: Creates a new file or erases an existing file for program output
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   [[OUTPUT]]: Creates a new file or erases an existing file for new program output
   [[APPEND]]: Creates a new file or appends data output to existing file
+
   [[APPEND]]: Creates a new file or appends program output to existing file
 
   [[BINARY]]: Creates a new file or uses input and/or output from existing file
 
   [[BINARY]]: Creates a new file or uses input and/or output from existing file
 
   [[RANDOM]]: Creates a new file or uses input and/or output from existing file
 
   [[RANDOM]]: Creates a new file or uses input and/or output from existing file
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''Bytes:'' number of bytes used in a RANDOM record as defined by [[FIELD]] or [[TYPE]] definitions.
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''Bytes:'' Integer number of bytes used in a RANDOM record as defined in a [[FIELD]] or [[TYPE]].

Revision as of 08:04, 28 August 2009

OPEN is used to open a file, COM(serial) or LPT(parallel) port.


Syntax 1: OPEN FileName$ FOR Mode AS #FileNumber [LEN = Bytes]


FileName$: as a string file name using the DOS 8.3 naming convention limits.


Modes: Open can use 5 different access modes:

 OUTPUT: Creates a new file or erases an existing file for new program output
 APPEND: Creates a new file or appends program output to existing file
 BINARY: Creates a new file or uses input and/or output from existing file
 RANDOM: Creates a new file or uses input and/or output from existing file
 INPUT : Only reads input from an existing file

FileNumber: as a low Integer number or a value from the FREEFILE function.


Bytes: Integer number of bytes used in a RANDOM record as defined in a FIELD or TYPE.