Modern Fs File WriteAt

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File.WriteAt

Writes bytes at an offset without moving the position; refused in append mode.

Syntax

File.WriteAt( pos, buf, n )

Notes

• Writes at pos without moving the position.
• Refused with FS_INVALID_ARGUMENT on a File opened for Append, where the two platforms disagree about where the bytes would go.

Examples

#import "std/fs"
using fs

dim as ustring dir_ = CreateTempDir( "tkdoc" ).Value( )
dim as ustring p = PathJoin( dir_, "f.txt" )
WriteAllText( p, "0123456789" )
dim as File f
f.Open( p, OpenOptionsRead( ) )
f.Close( )
dim as OpenOptions o
o.Write = true
f.Open( p, o )
f.WriteAt( 3, @"XY", 2 )
f.Close( )
print ReadAllText( p ).Value( )    '' 012XY56789

RemoveDirAll( dir_ )

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Library: Filesystem Library Category: File Streams Documented under: Files