Integer Values to Binary File

[slcotten]

Hello....

I have a array of a user defined type that I am adding to a file like this:



Open FileName for binary as #nFileNum

for nCount = LBound(g_MyArray) to UBound(g_MyArray) step 1
Put nFileNum, , g_MyArray(nCount)
next nCount

' close the file
Close nFileNum





Now I want to add some integers to the file that is not in the array. What is the best way to do that?

Much thanks in advance for your help.

[Iouri]

I think you can convert integer to binary and them to the file. Here is the code how to convert decimal to binary

Private Sub Form_Load()
txtDecimalValue.Text = "123456789"
End Sub

Private Sub txtDecimalValue_KeyPress(KeyAscii As Integer)
'Cancel input if the key pressed is not a number
If IsNumeric(Chr(KeyAscii)) = False Then
KeyAscii = 0
End If
End Sub
Function Bin(Number) ' both Variants
'===========================================
Dim BitStream() As Byte
Dim Bits As Byte
Dim BitPointer As Byte
Dim HexString As String
Dim lenHS As Integer
Dim HalfByte As Byte ' smallest VB word
Dim i As Integer
Dim j As Integer

Const DABug As Boolean = False
On Error GoTo eror

Select Case VarType(Number)
Case vbNull
'pass a null, return a null
Bin = Number
Exit Function
Case vbByte
' 0 to 255 unsigned
Bits = 8
Case vbInteger, vbBoolean
' -32,768 to 32,767
Bits = 16
Case vbLong
' -2,147,483,648 to 2,147,483,647
Bits = 32
Case vbSingle, vbDouble
Bits = 32
' HEX() will convert these
' to Longs (if possible!)
Case vbString
'-a Number of unspecified Type-
''Note: This expects a String to be a Number
'' To get the bits for a String, try this code:
''Dim BS() As Byte
''BS = MyString '-or- BS = StrConv(MyString, vbFromUnicode)
''For i = LBound(BS) To UBound(BS)
'' Print Bin(BS(i)),
''Next i
Case Else
Err.Raise 2001, , "Not sure HOW to handle a (" & TypeName(Number) & ") DATA TYPE?"
End Select

'' if HEX() can't handle it,
'' then neither can this code!
HexString = Hex(Number)
lenHS = Len(HexString)

If Bits = 0 Then Bits = lenHS * 4 'bits
ReDim BitStream(1 To Bits)
BitPointer = Bits

For i = lenHS To 1 Step -1
HalfByte = Val("&H" & Mid(HexString, i, 1))
For j = 1 To 4 ' bits
If HalfByte Then
BitStream(BitPointer) = HalfByte Mod 2
HalfByte = Fix(HalfByte / 2)
End If
BitPointer = BitPointer - 1
Next j
Next i

'now add 48 to all bits(bytes) for "0" or "1"
For i = 1 To Bits
BitStream(i) = BitStream(i) + 48
Next i

Bin = StrConv(BitStream, vbUnicode)
' format it
Bin = Trim(Format(Bin, "&&&&&&&& &&&&&&&& &&&&&&&& &&&&&&&&"))
'(format it here? or outside this proc?)
Exit Function

eror:
If DABug Then Debug.Print Err.Number & "-" & Err.Description
Err.Clear
Bin = "0"
End Function

Private Sub txtDecimalValue_Change()
lblBinaryValue.Caption = Bin(txtDecimalValue.Text)
End Sub




Iouri Boutchkine
[email protected]

[slcotten]

Thanks for your reply.... However I must have been unclear in my question. When adding the Array items (hereafter called records) using Statement Put to the file it adds them according the last record position. You can then Get the records in a similar fashion:

[vbcode]
nCount = 1

Open FileName For Binary As #nFileNum

Do
ReDim Preserve g_MyArray(nCount)

Get nFileNum, , g_MyArray(nCount)

' tells us if we are on the last record in file
If Loc(nFileNum) > LOF(nFileNum) Then
' If so Extract last record
ReDim Preserve g_OpenTree(LBound(g_OpenTree) To (nCount - 1))
' Finished opening file
Exit Do
End If

nCount = nCount + 1
Loop
[/vbcode}


What I would like to do is Put and Get variables BEFORE we Put and Get the Array records. How is this done? Hope this clarifies my query a little.... if not reply and say so.

Much thanks again for your help.

[slcotten]

Oooppss... the correct code for the previous post is this:



nCount = 1

Open FileName for binary as #nFileNum

Do
ReDim Preserve g_MyArray(nCount)

get nFileNum, , g_MyArray(nCount)

' tells us if we are on the last record in file
If Loc(nFileNum) > LOF(nFileNum) then
' If so Extract last record
ReDim Preserve g_MyArray(LBound(g_MyArray) to (nCount - 1))
' Finished opening file
Exit Do
End If

nCount = nCount + 1
Loop