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Visual Basic / Miscellaneous / Bits & Memory

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Added: 2002-08-19

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Bits & Memory

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Highlight AllOption Explicit 'modBits.bas '------------------------------------------------------------- ' Summary of contained methods: '------------------------------------------------------------- ' HiWord() ' LoWord() ' Word() ' HexToNumber() ' HexEx() ' ProcPtr() ' Random() '------------------------------------------------------------- ' API Function Declarations '------------------------------------------------------------- Private Declare Sub CopyMemory Lib "kernel32" _ Alias "RtlMoveMemory" (pDest As Any, pSource As Any, _ ByVal ByteLen As Long)
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Highlight All Public Function Random(ByVal Lowerbound As Long, ByVal Upperbound As Long) As Long '------------------------------------------------------------- ' Returns a random number between Lowerbound and Upperbound. '------------------------------------------------------------- Random = Int((Upperbound - Lowerbound + 1) * Rnd + Lowerbound) End Function Public Function ProcPtr(ByVal pAddressOfProc As Long) As Long '------------------------------------------------------------- ' Returns the pointer for a function. pAddressOfProc should ' be passed as AddressOf [proceedure name]. ' ' Example usage: ' ' pProc = ProcPtr(AddressOf HexEx) '------------------------------------------------------------- ProcPtr = pAddressOfProc End Function Public Function HexEx(ByVal iDec As Long, _ Optional iLen As Integer = 8, _ Optional bCNotation As Boolean) As String '------------------------------------------------------------- ' An enhanced version of VB's Hex() method that lets you ' specify how may preceeding zero's to keep in the output ' notation. Optionally, you can specify to use C notation for ' hex. '------------------------------------------------------------- Dim sHex As String sHex = Right$(String(iLen, "0") & Hex(iDec), iLen) If bCNotation Then HexEx = "0x" & sHex Else HexEx = "&H" & sHex End If End Function Public Function HexToNumber(ByVal sHexValue As String) As Long '------------------------------------------------------------- ' Converts the string representation of a hexidecimal number ' into a long value. It does account for the C notation (0x..) ' as well as VB's (&H..). '------------------------------------------------------------- Dim iVal As Long Dim i As Integer Dim iLen As Integer Const cHexChars = "0123456789ABCDEF" sHexValue = UCase$(sHexValue) If InStr(sHexValue, "H") > 0 Then sHexValue = Mid$(sHexValue, InStr(sHexValue, "H") + 1) Else If InStr(sHexValue, "X") > 0 Then sHexValue = Mid$(sHexValue, InStr(sHexValue, "X") + 1) End If End If iLen = Len(sHexValue) For i = iLen To 1 Step -1 iVal = iVal + ((16 ^ (iLen - i)) * (InStr(cHexChars, Mid$(sHexValue, i, 1)) - 1)) Next i If Hex(iVal) <> sHexValue Then Err.Raise 5 'illegal function call Else HexToNumber = iVal End If End Function Public Function Word(ByVal LoWord As Integer, _ ByVal HiWord As Integer) As Long '------------------------------------------------------------- ' Packs two integers into a long. '------------------------------------------------------------- ' API declarations: '------------------------------------------------------------- ' Private Declare Sub CopyMemory Lib "kernel32" _ ' Alias "RtlMoveMemory" (pDest As Any, pSource As Any, _ ' ByVal ByteLen As Long) '------------------------------------------------------------- Dim dw As Long CopyMemory dw, LoWord, 2& CopyMemory ByVal VarPtr(dw) + 2, HiWord, 2& Word = dw End Function Public Function HiWord(ByVal dw As Long) As Integer '------------------------------------------------------------- ' Extracts the HIWORD from a long. '------------------------------------------------------------- ' API declarations: '------------------------------------------------------------- ' Private Declare Sub CopyMemory Lib "kernel32" _ ' Alias "RtlMoveMemory" (pDest As Any, pSource As Any, _ ' ByVal ByteLen As Long) '------------------------------------------------------------- CopyMemory HiWord, ByVal VarPtr(dw) + 2, 2& End Function Public Function LoWord(ByVal dw As Long) As Integer '------------------------------------------------------------- ' Extracts the LOWORD from a long. '------------------------------------------------------------- ' API declarations: '------------------------------------------------------------- ' Private Declare Sub CopyMemory Lib "kernel32" _ ' Alias "RtlMoveMemory" (pDest As Any, pSource As Any, _ ' ByVal ByteLen As Long) '------------------------------------------------------------- CopyMemory LoWord, dw, 2& End Function

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