GoFiler Legato Script Reference   Legato v 1.4j Application v 5.22b

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Chapter Six — File Functions (continued)

OpenFile Function

Overview

The OpenFile function opens an existing file as a Basic File Object.

Syntax/Parameters

Syntax

handle = OpenFile ( string name, [dword mode] );

Parameters

name

A string containing a fully qualified path and filename. This parameter supports UTF encoding for filenames with Unicode characters.

mode

An optional dword specifying rights to the file. The parameter can be a combination of bitwise flags. See Remarks for modes. If omitted, the file is created with read access exclusive.

Return Value

Returns a handle to a Basic File Object or NULL_HANDLE on failure. Use the GetLastError function to retrieve error information. The GetLastErrorMessage function may contain information to supplement the error code. Error codes match Windows system error codes (for a list, see Appendix A — Legato SDK Standard Definitions or MSDN).

Remarks

The OpenFile function is a low-level function that allows for direct access to files located on a variety of devices. The files can be located on an NTFS or FAT file system. Access rights to the file are dependent on the user permissions set within the operating system. Files cannot be located on HTTP or FTP routines unless there is access via the VFC.

Access is controlled via the mode flags which can be a series of bitwise flags:

	Definition		Bitwise Value		Description
	FO_READ		0x00000000		Read-Only
	FO_WRITE		0x00000001		Read and Write
	FO_SHARE_READ		0x00000010		Allow Others to Open as Read
	FO_SHARE_WRITE		0x00000020		Allow Others to Open as Write
	FO_TEMP_FILE		0x00010001		Create/Delete Temp File Exclusive
	FO_DELAY_CREATE		0x00020001		Create Only, Delay on Share
	FO_CREATE_HIDDEN		0x00080000		Make Hidden on Create
	FO_WAIT_OPEN		0x00200000		Delay on Share (open)
	FO_FORCE_SPOOL		0x00800000		Forces Spool Out (requires create or FO_WRITE)

 

The function returns a handle to the file that can be used for various types of I/O. The handle should be closed using the CloseFile or DeleteFile functions.

For significantly more flexibility in editing a file that is organized in lines of text, use a Mapped Text Object. Mapped Text Objects can be created through the CreateMappedTextFile and CreateMappedTextString functions.

Related Functions

CreateFile — Creates a basic file with optional access mode and characteristics.

CloseFile — Closes file (handle). Same as CloseHandle.

DeleteFile — Deletes the specified file (with open handle or closed with a string specification).

CreateMappedTextFile — Creates a file and then opens it as a Mapped Text Object.

CreateMappedTextString — Creates a Mapped Text Object based on a string.

OpenMappedTextFile — Opens the specified file as a Mapped Text Object.

ReadBlock — Reads a block of data directly to a variable from the current position of a Basic File Object.

ReadLine — Reads the next line of data from a Basic File or Pool Object, or, reads a specified line from a Mapped Text or Edit Object.

WriteBlock — Writes a block to a Basic File Object at the current or specified position.

WriteLine — Writes a formatted line of text to a Basic File Object. Follows FormatString parameters.

Platform Support

Go13, Go16, GoFiler Complete, GoFiler Corporate, GoFiler, GoFiler Lite, GoXBRL

Legato IDE, Legato Basic

 

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GoFiler Legato Script Reference — Generated on 04/22/2024

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