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The concepts described in UserGuide:File Access, UserGuide:Text Files and UserGuide:Binary Files also apply to iOS projects, but different classes are used there. This topic shows how the code in those sections looks for iOS projects.

Accessing Files

In iOS projects you use the Xojo.IO.FolderItem class instead of the FolderItem class. Functionality between these two classes is very similar, although some methods and properties may be slightly different.

Text Files

In iOS projects you use the Xojo.IO.TextInputStream class instead of the TextInputStream class to read text files and the Xojo.IO.TextOutputStream class instead of the TextOutputStream class to write to text files. Functionality between these classes is similar, although some methods and properties may be slightly different.

Reading from a Text File

This code reads a file from Documents and displays the text in a TextArea:

Dim f As FolderItem = SpecialFolder.Documents.Child("MyFile.txt")
If f.Exists Then
Dim input As TextInputStream
input = TextInputStream.Open(f, TextEncoding.UTF8)
TextArea1.Text = input.ReadAll
input.Close
End If

Writing to a Text File

This code creates a file in Documents and saves text from TextFields into the file:

Dim file As FolderItem = SpecialFolder.Documents.Child("MyFile.txt")
If file <> Nil Then
Dim output As TextOutputStream
output = TextOutputStream.Create(file, TextEncoding.UTF8)
output.WriteLine(NameField.Text)
output.WriteLine(AddressField.Text)
output.WriteLine(PhoneField.Text)
output.Close
End If

Binary Files

In iOS projects you use the Xojo.IO.BinaryStream class instead of the BinaryStream class. Functionality between these classes is similar, although some methods and properties may be slightly different.

Reading from a Binary File

This code reads a file made up of strings, and displays those strings in a TextArea:

Dim f As FolderItem = SpecialFolder.Documents.Child("MyFile.data")
Dim bStream As BinaryStream
bStream = BinaryStream.Open(f, BinaryStream.LockModes.Read)

Dim data As MemoryBlock
data = bStream.Read(bStream.Length)

bStream.Close

Writing to a Binary File

This code writes the contents of the TextArea1 to a text file:

Dim f As FolderItem = SpecialFolder.Documents.Child("MyFile.data")
Dim bStream As BinaryStream
bStream = BinaryStream.Create(f)

Dim data As MemoryBlock
Dim t As Text = "Text for the binary file."
data = TextEncoding.UTF8.ConvertTextToData(t)
bStream.Write(data)
bStream.Close

See Also

Xojo.IO.FolderItem, Xojo.IO.BinaryStream, Xojo.IO.TextInputStream, Xojo.IO.TextOutputStream classes; UserGuide:Framework topic