OK i am new to .NET

[Jay1b]

I am trying to read in te contents of a file to a variable and then pass it on to a textbox, using the code below. However it doesnt seem to work, OpenMode Append or Output i get the error message below. Where as with binary it just freezes.

 

'An unhandled exception of type 'System.IO.IOException' occurred in microsoft.visualbasic.dll

 

Additional information: Bad file mode. '

 

 

 

Private Sub ActivateButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ActivateButton.Click

Dim GetTxtFile As String 'test variable for file get

 

'Writes to file

' FileOpen(1, "c:\test.txt", OpenMode.Binary, OpenAccess.Write)

'Print(1, "Hello", SPC(20), "Bye")

'FileClose(1)

 

'Retrieves the contents of the file to the variable name

FileOpen(2, "c:\test.txt", OpenMode.Binary)

FileGet(2, GetTxtFile)

FileClose(2)

 

DisplayText.Text = GetTxtFile

 

End Sub

End Class

 

Can anyone help me please?

[mutant]

You shouldnt use the old VB6 methods. Use System.IO.StreamReader class for reading files and System.IO.StreamWriter for writing to files.

Here is how you can a file into a variable and then assign it to a textbox:

Dim reader As New System.IO.StreamReader("path to the file")
Dim textfromfile As String = reader.ReadToEnd() 'use the ReadToEnd()
'method to read the whole file
TextBox1.Text = textfromfile 'assign the variable to the textbox's text

Edited August 17, 2003 by mutant

[Volte]

You'll need to use IO.BinaryReader to read a binary file. StreamReader won't do it properly I think.

[mutant]

Ah, sorry, I didnt notice that you were using binary access. Thanks VolteFace.

Dim reader As New IO.BinaryReader(New IO.FileStream("Path to the file", IO.FileMode.Open))
'new binary reader, you have to create a filestream as the BinaryReader
'itself doesnt take file paths but streams
'then you can read
reader.ReadChar() 'or other methods like that
reader.Close() 'close the stream

[Jay1b]

Thank you, but is there any reason why i shouldnt keep using the old VB way? Are they taking it out of the next version or something?

 

Also how do i know what to read it in as binary or stream? At the moment i am just reading in a textfile - or trying to [:)]

[PlausiblyDamp]

The older way is less functional, less extensible, slightly slower and incompatible with other .Net languages.

If you need to use 3rd party code / dlls that are based around the classes in System.IO then you would have to recode ALL your 'old-style' vb6 file handling code.

[mutant]

Also how do i know what to read it in as binary or stream? At the moment i am just reading in a textfile - or trying to [:)]

 

If you are just reading a plain text file then use the IO.StreamReader class.

:)

[Jay1b]

What would i use if i was reading in a picture or a word doc? Is the basic code the same - obvious a picture wouldnt go to a txtbox, but otherwise...........

 

Thanks.

[BryanZM]

use filestream

 

Use the filestream class, it makes it very easy to read in a file.

[mutant]

Do you want to put the picture in a picturebox? If yes then this is how you can load it:

PictureBox1.Image = Image.FromFile("path to the image")
'use a shared method of the Image class to load the picture

 

I believe that Word documents are encoded and simply reading them wont give you good results.

[Jay1b]

Excellent. Thank you.