Binary

Specifies file or device to be opened for binary mode

Syntax
	KeyPgOpenOpen filename for Binary [KeyPgAccessAccess access_type] [KeyPgLockLock lock_type] as [#]
	filenum 

Parameters
	filename
		file name to open
	access_type
		indicates whether the file may be read from, written to or both
	lock_type
		locking to be used while the file is open
	filenum
		unused file number to associate with the open file

Description
	Opens a file or device for reading and/or writing binary data in the 
	file filenum, with free format.
	If the file does not exist, a new file will be created. The file pointer 
	is initialized by KeyPgOpenOpen at byte no. 1. 
	KeyPgGetfileioGet # and KeyPgPutfileioPut # file operations move the file pointer according to the 
	size of the data, the pointer can be set to any byte in the file.
	The data existing in the file is preserved by KeyPgOpenOpen. 
	This file mode can use any buffer variable to read/write data in the 
	file.   
	The data is saved in binary mode, in the same internal format FreeBASIC 
	uses, by means of KeyPgGetfileioGet # and KeyPgPutfileioPut #.

	filename must be a string expression resulting in a legal file name in 
	the target OS, without wildcards. The file will be sought for in the 
	present directory, unless a path is given.

	Access_type By default Binary mode allows to both read and write the 
	file, unless an KeyPgAccessAccess type is specified, it must be one of: 
		* Read - the file is opened for input only
		* Write - the file is opened for output only
		* Read Write - the file is opened for input and output (the default)

	Lock_type indicates the way the file is locked  for other processes 
	(users or threads), it is one of:
		* Shared - The file can be freely accessed by other processes     
		* Lock Read - The file can't be opened simultaneously for reading
		* Lock Write - The file can't be opened simultaneously for writing
		* Lock Read Write - The file cannot be opened simultaneously by 
		  other processes.
		If no lock type is stated, the file will be Shared for other threads 
		of the program and Lock Read Write for other programs.
		KeyPgLockLock and KeyPgUnlockUnlock can be used to restrict temporally access to parts of 
		a file.

	filenum is a valid file number (in the range 1..255) not being used for 
	any other file presently open. The file number identifies the file for 
	the rest of file operations. A free file number can be found using the 
	KeyPgFreefileFreeFile function.

Example
	'' Create a binary data file with one number in it
	Dim x As Single = 17.164

	Open "MyFile.Dat" For Binary As #1
	  '' put without a position setting will put from the last known file position
	  '' in this case, the very beginning of the file.
	  Put #1, , x
	Close #1

	'' Now read the number from the file
	Dim x As Single = 0

	Open "MyFile.Dat" For Binary As #1
	  Get #1, , x
	Close #1

	Print x

	'' Read entire contents of a file to a string
	Dim txt As String

	Open "myfile.txt" For Binary Access Read As #1
	  If LOF(1) > 0 Then
	   '' our string has as many characters as the file has in bytes
	   txt = String(LOF(1), 0)
	   '' size of txt is known.  entire string filled with file data
	   Get #1, , txt
	  End If
	Close #1

	Print txt

Differences from QB
	* None

See also
	* KeyPgOpenOpen
	* KeyPgPutfileioPut #
	* KeyPgGetfileioGet #
	* KeyPgRandomRandom
	* KeyPgAppendAppend
	* KeyPgOutputOutput
	* KeyPgInputfilemodeInput

