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File I/O Functions

Vybe provides two sets of file operations: modern System.IO-style functions and legacy VB6-style statements.

System.IO.File (Standard)

Function	Syntax	Description
File.ReadAllText	File.ReadAllText(path)	Returns the entire content of a text file.
File.WriteAllText	File.WriteAllText(path, text)	Writes text to a file, overwriting existing content.
File.AppendAllText	File.AppendAllText(path, text)	Appends text to a file.
File.Exists	File.Exists(path)	Returns True if the specified file exists.
File.Delete	File.Delete(path)	Deletes the specified file.
File.Copy	File.Copy(src, dst)	Copies a file to a new location.
File.Move	File.Move(src, dst)	Moves a file to a new location.
File.ReadAllLines	File.ReadAllLines(path)	Reads all lines from a file into an array.

Path Class

The System.IO.Path class provides methods for manipulating path strings in a cross-platform manner.

Method	Description
GetFileName	Returns the file name and extension of the specified path string.
GetFileNameWithoutExtension	Returns the file name without the extension.
GetExtension	Returns the extension of the specified path string.
GetDirectoryName	Returns the directory information for the specified path string.
GetFullPath	Returns the absolute path for the specified path string.
GetTempPath	Returns the path of the current user's temporary folder.
HasExtension	Returns a value indicating whether a path includes a file name extension.
IsPathRooted	Returns a value indicating whether the specified path string contains a root.
ChangeExtension	Changes the extension of a path string.

Stream I/O

For more granular control over file reading and writing, use the StreamReader and StreamWriter classes.

StreamWriter

Used for writing text to a file.

• New(path): Opens a file for writing.
• WriteLine(text): Writes a line of text followed by a line terminator.
• Write(text): Writes text without a line terminator.
• Close(): Closes the writer and releases resources.

StreamReader

Used for reading text from a file.

• New(path): Opens a file for reading.
• ReadLine(): Reads a line of characters and returns it as a string.
• ReadToEnd(): Reads all characters from the current position to the end.
• EndOfStream: Property that returns True if the end of the stream has been reached.
• Close(): Closes the reader.

Examples

Modern System.IO

Dim configPath As String = "config.txt"
If File.Exists(configPath) Then
    Dim content As String = File.ReadAllText(configPath)
    MsgBox("Config: " & content)
Else
    File.WriteAllText(configPath, "Version=1.0")
End If

Legacy VB6 Style

Dim fNum As Integer = FreeFile()
Open "log.txt" For Append As #fNum
Print #fNum, "Log entry at " & Now()
Close #fNum

System.IO.Directory

Function	Syntax	Description
Directory.Exists	Directory.Exists(path)	Returns True if the specified directory exists.
Directory.CreateDirectory	Directory.CreateDirectory(path)	Creates all directories in the specified path.
Directory.Delete	Directory.Delete(path)	Deletes the specified directory and its contents.
Directory.GetFiles	Directory.GetFiles(path)	Returns an array of file names in a directory.
Directory.GetDirectories	Directory.GetDirectories(path)	Returns an array of directory names.
Directory.GetCurrentDirectory	Directory.GetCurrentDirectory()	Returns the current working directory.

VB6 Legacy Statements

Statement	Syntax	Description
Open	Open path For Mode As #id	Opens a file for I/O.
Close	Close [#id]	Closes one or more open files.
Print	Print #id, [expressions]	Writes formatted data to a file.
Write	Write #id, [expressions]	Writes data to a file in a compact format.
Input	Input #id, [variables]	Reads data from an open file.
Dir	Dir([pattern])	Returns the first file name matching the pattern.
Kill	Kill(pathname)	Deletes a file.
FileCopy	FileCopy(src, dst)	Copies a file.
MkDir	MkDir(path)	Creates a directory.
RmDir	RmDir(path)	Removes a directory.
ChDir	ChDir(path)	Changes the current directory.
CurDir	CurDir([drive])	Returns the current path.
FileLen	FileLen(path)	Returns the length of a file in bytes.
FileDateTime	FileDateTime(path)	Returns the last modified date/time of a file.
GetAttr	GetAttr(path)	Returns the attributes of a file or directory.
SetAttr	SetAttr(path, attr)	Sets the attributes of a file.
FreeFile	FreeFile()	Returns the next available file number.

File Handle Info

• EOF(id): Returns True if the end of file has been reached.
• LOF(id): Returns the length of an open file in bytes.
• LOC(id): Returns the current position within an open file.