How to return KB, MB and GB from Bytes using a public function

Question

I\'m writing a "function" that returns a file\'s size (in B, KB, MB, GB).

The VB.Net code always gets the size in bytes first, so when a file\'s size (in Bytes)

Answer 1

I would use a select case for it and not a if.
And always start with the biggest size." i stopped at TB but of Corse you can add more if you need ..."

I changed Dim TheSize As Integer to "Dim TheSize As ULong " otherwise big numbers don't work.

Also make a dim "Dim DoubleBytes As Double" you will use it in the select case.

First you compare the bytes you have with a case , lets say mb "Case 1048576 To 1073741823"
So if this is the case convert TheSize to a double "DoubleBytes = CDbl(TheSize / 1048576) 'MB "

Then in the return you use FormatNumber to set the number you want to show behind the . "the nuber 2 is to set it to 2 behind the . like 28.11 , change it to 0 and it will return 28" also because you know it mb you wil add & mb to the return.
"Return FormatNumber(DoubleBytes, 2) & " MB" "

Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
    MsgBox(GetFileSize("E:\Software\TeamSpeak3-Client-win64-3.0.14.exe"))
End Sub

Dim DoubleBytes As Double

Public Function GetFileSize(ByVal TheFile As String) As String
    If TheFile.Length = 0 Then Return ""
    If Not System.IO.File.Exists(TheFile) Then Return ""
    '---
    Dim TheSize As ULong = My.Computer.FileSystem.GetFileInfo(TheFile).Length
    Dim SizeType As String = ""
    '---

    Try
        Select Case TheSize
            Case Is >= 1099511627776
                DoubleBytes = CDbl(TheSize / 1099511627776) 'TB
                Return FormatNumber(DoubleBytes, 2) & " TB"
            Case 1073741824 To 1099511627775
                DoubleBytes = CDbl(TheSize / 1073741824) 'GB
                Return FormatNumber(DoubleBytes, 2) & " GB"
            Case 1048576 To 1073741823
                DoubleBytes = CDbl(TheSize / 1048576) 'MB
                Return FormatNumber(DoubleBytes, 2) & " MB"
            Case 1024 To 1048575
                DoubleBytes = CDbl(TheSize / 1024) 'KB
                Return FormatNumber(DoubleBytes, 2) & " KB"
            Case 0 To 1023
                DoubleBytes = TheSize ' bytes
                Return FormatNumber(DoubleBytes, 2) & " bytes"
            Case Else
                Return ""
        End Select
    Catch
        Return ""
    End Try
End Function

---

I made a dll for it.
Then I can import it to my project and I can call it whenever I need to change a byte number to something else "like mb etc"
FormatBytes(GetHDSizeF) "GetHDSizeF is the number of bytes"

Dim DoubleBytes As Double
Default Public Property FormatBytes(ByVal BytesCaller As ULong) As String
    Get
        Try
            Select Case BytesCaller
                Case Is >= 1099511627776
                    DoubleBytes = CDbl(BytesCaller / 1099511627776) 'TB
                    Return FormatNumber(DoubleBytes, 2) & " TB"
                Case 1073741824 To 1099511627775
                    DoubleBytes = CDbl(BytesCaller / 1073741824) 'GB
                    Return FormatNumber(DoubleBytes, 2) & " GB"
                Case 1048576 To 1073741823
                    DoubleBytes = CDbl(BytesCaller / 1048576) 'MB
                    Return FormatNumber(DoubleBytes, 2) & " MB"
                Case 1024 To 1048575
                    DoubleBytes = CDbl(BytesCaller / 1024) 'KB
                    Return FormatNumber(DoubleBytes, 2) & " KB"
                Case 0 To 1023
                    DoubleBytes = BytesCaller ' bytes
                    Return FormatNumber(DoubleBytes, 2) & " bytes"
                Case Else
                    Return ""
            End Select
        Catch
            Return ""
        End Try
    End Get
    Set(value As String)

    End Set
End Property

---

And if you don't want to make a dll you can use it like a normal function like this.

Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
    MsgBox(FormatBytes(2000))
End Sub

Dim DoubleBytes As Double
Public Function FormatBytes(ByVal BytesCaller As ULong) As String

    Try
        Select Case BytesCaller
            Case Is >= 1099511627776
                DoubleBytes = CDbl(BytesCaller / 1099511627776) 'TB
                Return FormatNumber(DoubleBytes, 2) & " TB"
            Case 1073741824 To 1099511627775
                DoubleBytes = CDbl(BytesCaller / 1073741824) 'GB
                Return FormatNumber(DoubleBytes, 2) & " GB"
            Case 1048576 To 1073741823
                DoubleBytes = CDbl(BytesCaller / 1048576) 'MB
                Return FormatNumber(DoubleBytes, 2) & " MB"
            Case 1024 To 1048575
                DoubleBytes = CDbl(BytesCaller / 1024) 'KB
                Return FormatNumber(DoubleBytes, 2) & " KB"
            Case 0 To 1023
                DoubleBytes = BytesCaller ' bytes
                Return FormatNumber(DoubleBytes, 2) & " bytes"
            Case Else
                Return ""
        End Select
    Catch
        Return ""
    End Try

End Function