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哪位高手请回答在vb中怎样表示一个无符号数啊?
发表于: 2005-1-21 00:06 7921

哪位高手请回答在vb中怎样表示一个无符号数啊?

2005-1-21 00:06
7921
哪位高手请回答在sp2下默认的是带符号数.在vb中怎样表示一个无符号数啊?原来的正数都变成了负数.

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雪    币: 324
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VB中只有Byte型数据是无符号的。其它类型都是有符号的。在使用时,只有程序员自己进行无符号数的处理。比如对于Long型,您可以用诸如“TempLong = (TempLong And &H7FFFFFFF)”的语句将符号位屏蔽,然后进行运算,最后再对结果的符号位进行适当处理。
2005-1-21 08:31
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雪    币: 15136
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最初由 chywan 发布
VB中只有Byte型数据是无符号的。其它类型都是有符号的。在使用时,只有程序员自己进行无符号数的处理。比如对于Long型,您可以用诸如“TempLong = (TempLong And &H7FFFFFFF)”的语句将符号位屏蔽,然后进行运算,最后再对结果的符号位进行适当处理。


谢谢!!能举个例子就更好了,如 硬盘号"8C5E20A8",正确的十进制应为" 2354978984" ,但sp2下却为"-1939988312",怎样处理?
2005-1-21 09:47
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直接从RING3获取硬盘序列号
'****************************************************************
'原作: Bardo
'出处: 《东方热讯》网站
'网址: www.easthot.net
'****************************************************************
'(如需转载,请不在删除以上信息,否则视为侵权!)
'****************************************************************

    要这个有什么用?可以生成与硬件相关的注册码。控制软件不重复使用!那么,很多多人认为VB实现不了。自然没有找到方法,一定是实现不了。然而,感谢WWW,我们能在上面找到VC的源码,DELPHI的源码。但是VB的就是见不到。为此,我决定将VC的源码改成VB的,以下即是:

'VC原作说明部分(再发行时,请注意采用注解的方式,请不要删除的方式侵权,谢谢!)
'*************************************************************************
'通常情况下,我们通过=&HEC命令对IDE端口进行监测.获取硬盘信息.
'一般情况下,我们就写个VXD或者DRIVER来完成.但是现在,通过MS的S.M.A.R.T.接口,
'我们可以直接从RING3调用API DeviceIoControl()来获取硬盘信息.下面乃是我的例程:
'另外,也有编译好的版本供大家平时使用.欢迎下载.
'/*+++
'HDID.CPP
'Written by Lu Lin
'http://lu0.126.com
'2000.11.3
'---*/
'*************************************************************************
'VB程序编制: BARDO
'本来我想写一个只取盘动物理序列号的。但是考虑到大家学习的方便。还是将原来的代码
'全部翻译了出来。如果你需要单一的只查一个主硬盘的序列号的程序,欢迎到本站下载。
'
'网站:东方热讯:http://www.easthot.net
'邮件:sales@easthot.net
'2003.01.23
'*************************************************************************
Option Explicit
'以下这一行是必须的,困为要做结构复制。而结构中有数组。所以,没有它则会错位
Option Base 0

Private Const DFP_GET_VERSION = &H74080
Private Const DFP_SEND_DRIVE_COMMAND = &H7C084
Private Const DFP_RECEIVE_DRIVE_DATA = &H7C088

'#pragma pack(1)
Private Type TGETVERSIONOUTPARAMS   '{
    bVersion As Byte  'Binary driver version.
    bRevision As Byte 'Binary driver revision.
    bReserved As Byte  'Not used.
    bIDEDeviceMap As Byte 'Bit map of IDE devices.
    fCapabilities As Long 'Bit mask of driver capabilities.
    dwReserved(4) As Long 'For future use.
End Type

Private Type TIDEREGS
    bFeaturesReg As Byte   'Used for specifying SMART "commands".
    bSectorCountReg As Byte  'IDE sector count register
    bSectorNumberReg As Byte  'IDE sector number register
    bCylLowReg As Byte    'IDE low order cylinder value
    bCylHighReg As Byte   'IDE high order cylinder value
    bDriveHeadReg As Byte   'IDE drive/head register
    bCommandReg As Byte   'Actual IDE command.
    bReserved As Byte    'reserved for future use.  Must be zero.
End Type

Private Type TSENDCMDINPARAMS
    cBufferSize As Long   'Buffer size in bytes
    irDriveRegs As TIDEREGS   'Structure with drive register values.
    bDriveNumber As Byte   'Physical drive number to send  'command to (0,1,2,3).
    bReserved(2) As Byte   'Reserved for future expansion.
    dwReserved(3) As Long   'For future use.
    ''BYTE  bBuffer(1)   'Input buffer.
End Type

Private Type TDRIVERSTATUS
    bDriverError As Byte  'Error code from driver, 'or 0 if no error.
    bIDEStatus  As Byte  'Contents of IDE Error register.
           'Only valid when bDriverError 'is SMART_IDE_ERROR.
    bReserved(1) As Byte   'Reserved for future expansion.
    dwReserved(1) As Long   'Reserved for future expansion.
End Type

Private Type TSENDCMDOUTPARAMS
    cBufferSize As Long      'Size of bBuffer in bytes
    DRIVERSTATUS As TDRIVERSTATUS   'Driver status structure.
    bBuffer(511) As Byte   'Buffer of arbitrary length
             'in which to store the data read from the drive.
End Type

'下面的结构是要从另一结构复制数据过来的,所以,必须是字节数与VC的完全一致
'而不能用兼容变量,但这里的我们还是用了兼容变量,Integer,因为此结构中这一
'类型的的变量程序中没有用到,如果要用到,建议改为Byte类型。因为VB没有USHORT

Private Type TIDSECTOR
    wGenConfig As Integer
    wNumCyls As Integer
    wReserved As Integer
    wNumHeads As Integer
    wBytesPerTrack As Integer
    wBytesPerSector As Integer
    wSectorsPerTrack As Integer
    wVendorUnique(2) As Integer
    sSerialNumber(19) As Byte
    wBufferType As Integer
    wBufferSize As Integer
    wECCSize As Integer
    sFirmwareRev(7) As Byte
    sModelNumber(39) As Byte
    wMoreVendorUnique As Integer
    wDoubleWordIO As Integer
    wCapabilities As Integer
    wReserved1 As Integer
    wPIOTiming As Integer
    wDMATiming As Integer
    wBS As Integer
    wNumCurrentCyls As Integer
    wNumCurrentHeads As Integer
    wNumCurrentSectorsPerTrack As Integer
    ulCurrentSectorCapacity(3) As Byte   '这里只能用byte,因为VB没有无符号的LONG型变量
    wMultSectorStuff As Integer
    ulTotalAddressableSectors(3) As Byte '这里只能用byte,因为VB没有无符号的LONG型变量
    wSingleWordDMA As Integer
    wMultiWordDMA As Integer
    bReserved(127) As Byte
End Type

'/*+++
'Global vars
'---*/
Private vers As TGETVERSIONOUTPARAMS
Private in_data As TSENDCMDINPARAMS
Private out_data As TSENDCMDOUTPARAMS
Private h As Long
Private i As Long
Private j As Byte

Private Type OSVERSIONINFO
    dwOSVersionInfoSize As Long
    dwMajorVersion As Long
    dwMinorVersion As Long
    dwBuildNumber As Long
    dwPlatformId As Long
    szCSDVersion As String * 128
End Type

Private Declare Function GetVersionEx Lib "kernel32" Alias "GetVersionExA" _
          (LpVersionInformation As OSVERSIONINFO) As Long

Private Const VER_PLATFORM_WIN32S = 0
Private Const VER_PLATFORM_WIN32_WINDOWS = 1
Private Const VER_PLATFORM_WIN32_NT = 2

Private Declare Function CreateFile Lib "kernel32" _
    Alias "CreateFileA" (ByVal lpFileName As String, _
    ByVal dwDesiredAccess As Long, ByVal dwShareMode As Long, _
    ByVal lpSecurityAttributes As Long, _
    ByVal dwCreationDisposition As Long, _
    ByVal dwFlagsAndAttributes As Long, ByVal hTemplateFile As Long) _
    As Long

Private Const CREATE_NEW = 1
Private Const GENERIC_READ = &H80000000
Private Const GENERIC_WRITE = &H40000000
Private Const OPEN_EXISTING = 3
Private Const FILE_SHARE_READ = &H1
Private Const FILE_SHARE_WRITE = &H2

Private Type OVERLAPPED
    Internal As Long
    InternalHigh As Long
    offset As Long
    OffsetHigh As Long
    hEvent As Long
End Type

Private Declare Function DeviceIoControl Lib "kernel32" _
    (ByVal hDevice As Long, ByVal dwIoControlCode As Long, _
    lpInBuffer As Any, ByVal nInBufferSize As Long, _
    lpOutBuffer As Any, ByVal nOutBufferSize As Long, _
    lpBytesReturned As Long, lpOverlapped As OVERLAPPED) As Long

Private Declare Function CloseHandle Lib "kernel32" (ByVal hObject As Long) As Long

Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" ( _
         hpvDest As Any, hpvSource As Any, ByVal cbCopy As Long)

Private Sub CopyRight()
'VC原版权代码(再发行时,请注意采用注解的方式,请不要删除的方式侵权,谢谢!)
'****************************************************************************
' cerr<<endl<<"HDD identifier v1.0 for WIN95/98/Me/NT/2000. written by Lu Lin"<<endl
' cerr<<"For more information, please visit Inside Programming: http:'lu0.126.com"<<endl
' cerr<<"2000.11.3"<<endl<<endl
'****************************************************************************
Dim StrMsg As String
StrMsg = StrMsg & "直接从RING3调用API DeviceIoControl()来获取硬盘信息的VB程序 "
StrMsg = StrMsg & vbCrLf & "VC源作板权信息如下:"
StrMsg = StrMsg & vbCrLf & "***********************************************************"
StrMsg = StrMsg & vbCrLf & "HDD identifier v1.0 for WIN95/98/Me/NT/2000. written by Lu Lin"
StrMsg = StrMsg & vbCrLf & "For more information, please visit Inside Programming: http://lu0.126.com"
StrMsg = StrMsg & vbCrLf & "2000.11.3"
StrMsg = StrMsg & vbCrLf & "***********************************************************"
StrMsg = StrMsg & vbCrLf & "VB程序编制:BARDO"
StrMsg = StrMsg & vbCrLf & "网站:东方热讯:http://www.easthot.net"
StrMsg = StrMsg & vbCrLf & "邮件:sales@easthot.net"
StrMsg = StrMsg & vbCrLf & "2003.01.23"
MsgBox StrMsg
End Sub

Sub ChangeByteOrder(szString() As Byte, uscStrSize As Long)
    Dim i As Long
    Dim temp As String
     For i = 0 To uscStrSize - 1 Step 2
        temp = szString(i)
        szString(i) = szString(i + 1)
        szString(i + 1) = temp
     Next i
End Sub

Private Function hdid9x() As String

'We start in 95/98/Me
h = CreateFile("\\.\Smartvsd", 0, 0, 0, CREATE_NEW, 0, 0)
If h = 0 Then
    hdid9x = "open smartvsd.vxd failed"
    Exit Function
End If

Dim olp As OVERLAPPED
Dim lRet As Long
lRet = DeviceIoControl(h, DFP_GET_VERSION, ByVal 0&, 0, vers, Len(vers), ByVal i, olp)
If lRet = 0 Then
        hdid9x = "DeviceIoControl failed:DFP_GET_VERSION"
        CloseHandle (h)
        Exit Function
End If

'If IDE identify command not supported, fails
If (vers.fCapabilities And 1) <> 1 Then
    hdid9x = "Error: IDE identify command not supported."
    CloseHandle (h)
    Exit Function
End If

'Display IDE drive number detected
Dim sPreOutStr As String
sPreOutStr = DetectIDE(vers.bIDEDeviceMap)
hdid9x = sPreOutStr

'Identify the IDE drives
For j = 0 To 3
    Dim phdinfo As TIDSECTOR
    Dim s(40) As Byte
   
    If (j And 1) = 1 Then
        in_data.irDriveRegs.bDriveHeadReg = &HB0
    Else
        in_data.irDriveRegs.bDriveHeadReg = &HA0
    End If
    If (vers.fCapabilities And (16 \ (2 ^ j))) = (16 \ (2 ^ j)) Then
        'We don't detect a ATAPI device.
        hdid9x = "Drive " & CStr(j + 1) & " is a ATAPI device, we don't detect it"
    Else
          in_data.irDriveRegs.bCommandReg = &HEC
          in_data.bDriveNumber = j
          in_data.irDriveRegs.bSectorCountReg = 1
          in_data.irDriveRegs.bSectorNumberReg = 1
          in_data.cBufferSize = 512
         
          lRet = DeviceIoControl(h, DFP_RECEIVE_DRIVE_DATA, in_data, Len(in_data), out_data, Len(out_data), ByVal i, olp)
         
          If lRet = 0 Then
              hdid9x = "DeviceIoControl failed:DFP_RECEIVE_DRIVE_DATA"
              CloseHandle (h)
              Exit Function
          End If
         
          Dim StrOut As String
         
          CopyMemory phdinfo, out_data.bBuffer(0), Len(phdinfo)
         
          CopyMemory s(0), phdinfo.sModelNumber(0), 40
          s(40) = 0
          ChangeByteOrder s, 40
         
          StrOut = ByteArrToString(s, 40)
         
          hdid9x = hdid9x & vbCrLf & "Module Number:" & StrOut
          CopyMemory s(0), phdinfo.sFirmwareRev(0), 8
          s(8) = 0
          ChangeByteOrder s, 8
         
          StrOut = ByteArrToString(s, 8)
         
          hdid9x = hdid9x & vbCrLf & "Firmware rev:" & StrOut
          CopyMemory s(0), phdinfo.sSerialNumber(0), 20
          s(20) = 0
          ChangeByteOrder s, 20
         
          StrOut = ByteArrToString(s, 20)
         
          hdid9x = hdid9x & vbCrLf & "Serial Number:" & StrOut
         
          CopyMemory s(0), phdinfo.ulTotalAddressableSectors(0), 4
         
          s(5) = 0
          Dim dblStrOut As Double
          dblStrOut = ByteArrToLong(s)
          hdid9x = hdid9x & vbCrLf & "Capacity:" & dblStrOut / 2 / 1024 & "M"
      End If
Next j

'Close handle before quit
CloseHandle (h)
CopyRight

End Function

Private Function hdidnt() As String
Dim hd As String * 80
Dim phdinfo As TIDSECTOR
Dim s(40) As Byte
Dim StrOut As String

hdidnt = ""
'We start in NT/Win2000

For j = 0 To 3  '这里取四个硬盘的信息,因为正常PC不超过四个硬盘
     hd = "\\.\PhysicalDrive" & CStr(j)
     hdidnt = hdidnt & vbCrLf & hd
     h = CreateFile(hd, GENERIC_READ Or GENERIC_WRITE, _
          FILE_SHARE_READ Or FILE_SHARE_WRITE, 0, OPEN_EXISTING, 0, 0)
     
     Dim olpv As OVERLAPPED
     
     Dim lRet As Long
     lRet = DeviceIoControl(h, DFP_GET_VERSION, ByVal 0&, 0, vers, Len(vers), ByVal i, olpv)
     
     If lRet = 0 Then
         CloseHandle (h)
     Else
            'If IDE identify command not supported, fails
            If (vers.fCapabilities And 1) <> 1 Then
                  hdidnt = "Error: IDE identify command not supported."
                  CloseHandle (h)
                  Exit Function
            End If
            'Identify the IDE drives
            If (j And 1) = 1 Then
                in_data.irDriveRegs.bDriveHeadReg = &HB0
            Else
                in_data.irDriveRegs.bDriveHeadReg = &HA0
            End If
            If (vers.fCapabilities And (16 \ (2 ^ j))) <> 0 Then
                'We don't detect a ATAPI device.
                hdidnt = hdidnt & vbCrLf & "Drive " & CStr(j + 1) & " is a ATAPI device, we don't detect it"
            Else
                  
                  in_data.irDriveRegs.bCommandReg = &HEC
                  in_data.bDriveNumber = j
                  in_data.irDriveRegs.bSectorCountReg = 1
                  in_data.irDriveRegs.bSectorNumberReg = 1
                  in_data.cBufferSize = 512
                  
                  Dim olpr As OVERLAPPED
                  
                  lRet = DeviceIoControl(h, DFP_RECEIVE_DRIVE_DATA, in_data, Len(in_data), out_data, Len(out_data), ByVal i, olpr)
                  If lRet <= 0 Then
                       hdidnt = hdidnt & vbCrLf & "DeviceIoControl failed:DFP_RECEIVE_DRIVE_DATA"
                       CloseHandle (h)
                       
                  Else
               
                     CopyMemory phdinfo, out_data.bBuffer(0), Len(phdinfo)
                     
                     CopyMemory s(0), phdinfo.sModelNumber(0), 40
                     s(40) = 0
                     ChangeByteOrder s, 40
                     
                     StrOut = ByteArrToString(s, 40)
                     
                     hdidnt = hdidnt & vbCrLf & "Module Number:" & StrOut
                     CopyMemory s(0), phdinfo.sFirmwareRev(0), 8
                     s(8) = 0
                     ChangeByteOrder s, 8
                     
                     StrOut = ByteArrToString(s, 8)
                     
                     hdidnt = hdidnt & vbCrLf & "Firmware rev:" & StrOut
                     CopyMemory s(0), phdinfo.sSerialNumber(0), 20
                     s(20) = 0
                     ChangeByteOrder s, 20
                     
                     StrOut = ByteArrToString(s, 20)
                     
                     hdidnt = hdidnt & vbCrLf & "Serial Number:" & StrOut
                     
                     CopyMemory s(0), phdinfo.ulTotalAddressableSectors(0), 4
                     s(5) = 0
                     Dim dblStrOut As Double
                     dblStrOut = ByteArrToLong(s)
                     
                     hdidnt = hdidnt & vbCrLf & "Capacity:" & dblStrOut / 2 / 1024 & "M"
                     CloseHandle (h)
                  End If
            End If
       End If
Next j
CopyRight

End Function

Sub Main()

Dim verinfo As OSVERSIONINFO
Dim Ret As Long
verinfo.dwOSVersionInfoSize = Len(verinfo)
Ret = GetVersionEx(verinfo)
Dim OutStr As String
Select Case verinfo.dwPlatformId
Case VER_PLATFORM_WIN32S
    MsgBox "Win32s is not supported by this programm."
    End
Case VER_PLATFORM_WIN32_WINDOWS
    OutStr = hdid9x
    MsgBox OutStr
    End
Case VER_PLATFORM_WIN32_NT
    OutStr = hdidnt
    MsgBox OutStr
    End
End Select

End Sub

Private Function DetectIDE(bIDEDeviceMap As Byte) As String
    If (bIDEDeviceMap And 1) Then
        If (bIDEDeviceMap And 16) Then
             DetectIDE = DetectIDE & "ATAPI device is attached to primary controller, drive 0."
        Else
             DetectIDE = DetectIDE & "IDE device is attached to primary controller, drive 0."
        End If
    End If
    If (bIDEDeviceMap And 2) Then
        If (bIDEDeviceMap And 32) Then
             DetectIDE = DetectIDE & "ATAPI device is attached to primary controller, drive 1."
        Else
             DetectIDE = DetectIDE & "IDE device is attached to primary controller, drive 1."
        End If
    End If
    If (bIDEDeviceMap And 4) Then
        If (bIDEDeviceMap And 64) Then
             DetectIDE = DetectIDE & "ATAPI device is attached to secondary controller, drive 0."
        Else
             DetectIDE = DetectIDE & "IDE device is attached to secondary controller, drive 0."
        End If
    End If
    If (bIDEDeviceMap And 8) Then
        If (bIDEDeviceMap And 128) Then
             DetectIDE = DetectIDE & "ATAPI device is attached to secondary controller, drive 1."
        Else
             DetectIDE = DetectIDE & "IDE device is attached to secondary controller, drive 1."
        End If
    End If
End Function

Private Function ByteArrToString(inByte() As Byte, ByVal strlen As Integer) As String
    Dim i As Integer
    For i = 0 To strlen
        If inByte(i) = 0 Then
           Exit For
        End If
        ByteArrToString = ByteArrToString & Chr(inByte(i))
    Next i
End Function

Private Function ByteArrToLong(inByte() As Byte) As Double
    Dim i As Integer
    For i = 0 To 3
        ByteArrToLong = ByteArrToLong + CDbl(inByte(i)) * (256 ^ i)
    Next i
   
End Function
2005-1-21 10:38
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雪    币: 15136
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thank you larblue,I'll try it!!
2005-1-21 10:49
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