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 textboxs text

 

[Volte]

Youll need to use IO.BinaryReader to read a binary file. StreamReader wont 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]

Originally posted by Jay1b

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.