小弟刚刚接触VB,
程序要记录一些日志纪录在文本文件
Open filename For Append As #FileHandle1 '打开文件
Print #FileHandle1, "" '写入日志
Close #FileHandle1 '关闭文件每次要看日志的时候都要把程序结束日志才会写到文件里,郁闷啊........有人说 FlushViewOfFile API 可以把缓存中的内容写到文件中,
但参数不知道该怎么给 ,汗......各位帮忙看看该怎么解决,总不能写一次日志就open close一次吧,晕!!!!!!!!!!
程序要记录一些日志纪录在文本文件
Open filename For Append As #FileHandle1 '打开文件
Print #FileHandle1, "" '写入日志
Close #FileHandle1 '关闭文件每次要看日志的时候都要把程序结束日志才会写到文件里,郁闷啊........有人说 FlushViewOfFile API 可以把缓存中的内容写到文件中,
但参数不知道该怎么给 ,汗......各位帮忙看看该怎么解决,总不能写一次日志就open close一次吧,晕!!!!!!!!!!
'*****************************************************************
' Module for performing Direct Read/Write access to disk sectors
'
' Written by Arkadiy Olovyannikov ([email protected])
'*****************************************************************
Option Explicit Public Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (Destination As Any, Source As Any, ByVal Length As Long) Public Declare Sub Sleep Lib "kernel32" (ByVal dwMilliseconds As Long) '*************Win9x direct Read/Write Staff**********
Public Enum FAT_WRITE_AREA_CODE
FAT_AREA = &H2001
ROOT_DIR_AREA = &H4001
DATA_AREA = &H6001
End Enum Private Type DISK_IO
dwStartSector As Long
wSectors As Integer
dwBuffer As Long
End Type
Private Type DIOC_REGISTER
reg_EBX As Long
reg_EDX As Long
reg_ECX As Long
reg_EAX As Long
reg_EDI As Long
reg_ESI As Long
reg_Flags As Long
End Type Private Const VWIN32_DIOC_DOS_IOCTL = 1& 'Int13 - 440X functions
Private Const VWIN32_DIOC_DOS_INT25 = 2& 'Int25 - Direct Read Command
Private Const VWIN32_DIOC_DOS_INT26 = 3& 'Int26 - Direct Write Command
Private Const VWIN32_DIOC_DOS_DRIVEINFO = 6& 'Extended Int 21h function 7305h Private Const FILE_DEVICE_FILE_SYSTEM = &H9&
Private Const FILE_ANY_ACCESS = 0
Private Const FILE_READ_ACCESS = &H1
Private Const FILE_WRITE_ACCESS = &H2 Private Const GENERIC_READ = &H80000000
Private Const GENERIC_WRITE = &H40000000
Private Const FILE_SHARE_READ = &H1
Private Const FILE_SHARE_WRITE = &H2
Private Const OPEN_EXISTING = 3
Private Const INVALID_HANDLE_VALUE = -1& 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 Declare Function CloseHandle Lib "kernel32" (ByVal hObject As Long) As Long Private Declare Function DeviceIoControl Lib "kernel32" (ByVal hDevice As Long, ByVal dwIoControlCode As Long, ByRef lpInBuffer As Any, ByVal nInBufferSize As Long, ByRef lpOutBuffer As Any, ByVal nOutBufferSize As Long, ByRef lpBytesReturned As Long, ByVal lpOverlapped As Long) As Long '****************** NT direct Read/Write staff**************************************************
Private Declare Function SetFilePointer Lib "kernel32" (ByVal hFile As Long, ByVal lDistanceToMove As Long, lpDistanceToMoveHigh As Long, ByVal dwMoveMethod As Long) As Long Private Declare Function ReadFile Lib "kernel32" (ByVal hFile As Long, lpBuffer As Any, ByVal nNumberOfBytesToRead As Long, lpNumberOfBytesRead As Long, ByVal lpOverlapped As Long) As Long Private Declare Function WriteFile Lib "kernel32" (ByVal hFile As Long, lpBuffer As Any, ByVal nNumberOfBytesToWrite As Long, lpNumberOfBytesWritten As Long, ByVal lpOverlapped As Long) As Long Private Declare Function FlushFileBuffers Lib "kernel32" (ByVal hFile As Long) As Long Private Declare Function LockFile Lib "kernel32" (ByVal hFile As Long, ByVal dwFileOffsetLow As Long, ByVal dwFileOffsetHigh As Long, ByVal nNumberOfBytesToLockLow As Long, ByVal nNumberOfBytesToLockHigh As Long) As Long Private Declare Function UnlockFile Lib "kernel32" (ByVal hFile As Long, ByVal dwFileOffsetLow As Long, ByVal dwFileOffsetHigh As Long, ByVal nNumberOfBytesToUnlockLow As Long, ByVal nNumberOfBytesToUnlockHigh As Long) As Long Private Const FILE_BEGIN = 0 Public Function DirectReadDrive(ByVal sDrive As String, ByVal iStartSec As Long, ByVal iOffset As Long, ByVal cBytes As Long) As Variant
If IsWindowsNT Then
DirectReadDrive = DirectReadDriveNT(sDrive, iStartSec, iOffset, cBytes)
Else
If FSName = "FAT12" Or FSName = "FAT16" Then
DirectReadDrive = DirectReadFloppy9x(sDrive, iStartSec, iOffset, cBytes)
Else
DirectReadDrive = DirectReadDrive9x(sDrive, iStartSec, iOffset, cBytes)
End If
End If
End Function Public Function DirectWriteDrive(ByVal sDrive As String, ByVal iStartSec As Long, ByVal iOffset As Long, ByVal sWrite As String, Optional AreaCode As FAT_WRITE_AREA_CODE = DATA_AREA) As Boolean
If IsWindowsNT Then
DirectWriteDrive = DirectWriteDriveNT(sDrive, iStartSec, iOffset, sWrite)
Else
If FSName = "FAT12" Or FSName = "FAT16" Then
DirectWriteDrive = DirectWriteFloppy9x(sDrive, iStartSec, iOffset, sWrite)
Else
DirectWriteDrive = DirectWriteDrive9x(sDrive, iStartSec, iOffset, sWrite, AreaCode)
End If
End If
End Function '===Direct Read/Write floppy using Int25/26===
'Works only for FAT12/16 systems, but much more quicker
'Then Int21 7305 function Private Function DirectReadFloppy9x(ByVal sDrive As String, ByVal iStartSec As Long, ByVal iOffset As Long, ByVal cBytes As Long) As Variant
Dim hDevice As Long
Dim reg As DIOC_REGISTER
Dim nSectors As Long
Dim aOutBuff() As Byte
Dim abResult() As Byte
Dim nRead As Long
nSectors = Int((iOffset + cBytes - 1) / BytesPerSector) + 1
ReDim aOutBuff(nSectors * BytesPerSector)
ReDim abResult(cBytes - 1) As Byte
With reg
.reg_EAX = Asc(UCase(sDrive)) - Asc("A")
.reg_ESI = &H6000
.reg_ECX = nSectors
.reg_EBX = VarPtr(aOutBuff(0))
.reg_EDX = iStartSec
End With
hDevice = CreateFile("\\.\VWIN32", GENERIC_READ, FILE_SHARE_READ Or FILE_SHARE_WRITE, 0&, OPEN_EXISTING, 0&, 0&)
If hDevice = INVALID_HANDLE_VALUE Then Exit Function
Call DeviceIoControl(hDevice, VWIN32_DIOC_DOS_INT25, reg, Len(reg), reg, Len(reg), nRead, 0&)
CloseHandle hDevice
CopyMemory abResult(0), aOutBuff(iOffset), cBytes
DirectReadFloppy9x = abResult
End Function Private Function DirectWriteFloppy9x(ByVal sDrive As String, ByVal iStartSec As Long, ByVal iOffset As Long, ByVal sWrite As String) As Boolean
Dim hDevice As Long
Dim reg As DIOC_REGISTER
Dim nSectors As Long
Dim abBuff() As Byte
Dim ab() As Byte
Dim nRead As Long
nSectors = Int((iOffset + Len(sWrite) - 1) / BytesPerSector) + 1
abBuff = DirectReadFloppy9x(sDrive, iStartSec, 0, nSectors * BytesPerSector)
ab = StrConv(sWrite, vbFromUnicode)
CopyMemory abBuff(iOffset), ab(0), Len(sWrite)
With reg
.reg_EAX = Asc(UCase(sDrive)) - Asc("A")
.reg_ESI = &H6000
.reg_ECX = nSectors
.reg_EBX = VarPtr(abBuff(0))
.reg_EDX = iStartSec
End With
hDevice = CreateFile("\\.\VWIN32", GENERIC_READ, FILE_SHARE_READ Or FILE_SHARE_WRITE, 0&, OPEN_EXISTING, 0&, 0&)
If hDevice = INVALID_HANDLE_VALUE Then Exit Function
DirectWriteFloppy9x = DeviceIoControl(hDevice, VWIN32_DIOC_DOS_INT26, reg, Len(reg), reg, Len(reg), nRead, 0&) And Not (reg.reg_Flags And 1)
CloseHandle hDevice
End Function '====Direct Read/Write drive using Int21 function 7305h====
'works with FAT12/16/32
Private Function DirectReadDrive9x(ByVal sDrive As String, ByVal iStartSec As Long, ByVal iOffset As Long, ByVal cBytes As Long) As Variant
Dim hDevice As Long
Dim reg As DIOC_REGISTER
Dim dio As DISK_IO
Dim abDioBuff() As Byte
Dim nSectors As Long
Dim aOutBuff() As Byte
Dim abResult() As Byte
Dim nRead As Long
nSectors = Int((iOffset + cBytes - 1) / BytesPerSector) + 1
ReDim abResult(cBytes - 1) As Byte
ReDim aOutBuff(nSectors * BytesPerSector - 1)
With dio
.dwStartSector = iStartSec
.wSectors = CInt(nSectors)
.dwBuffer = VarPtr(aOutBuff(0))
End With
ReDim abDioBuff(LenB(dio) - 1)
CopyMemory abDioBuff(0), dio, LenB(dio)
CopyMemory abDioBuff(6), abDioBuff(8), 4&
With reg
.reg_EAX = &H7305 'function number
.reg_ECX = -1&
.reg_EBX = VarPtr(abDioBuff(0))
.reg_EDX = Asc(UCase(sDrive)) - Asc("A") + 1
End With
hDevice = CreateFile("\\.\VWIN32", GENERIC_READ, FILE_SHARE_READ Or FILE_SHARE_WRITE, 0&, OPEN_EXISTING, 0&, 0&)
If hDevice = INVALID_HANDLE_VALUE Then Exit Function
Call DeviceIoControl(hDevice, VWIN32_DIOC_DOS_DRIVEINFO, reg, Len(reg), reg, Len(reg), nRead, 0&)
CloseHandle hDevice
CopyMemory abResult(0), aOutBuff(iOffset), cBytes
DirectReadDrive9x = abResult
End Function Private Function DirectWriteDrive9x(ByVal sDrive As String, ByVal iStartSec As Long, ByVal iOffset As Long, ByVal sWrite As String, ByVal AreaCode As FAT_WRITE_AREA_CODE) As Boolean
Dim hDevice As Long, nSectors As Long
Dim nRead As Long
Dim reg As DIOC_REGISTER
Dim dio As DISK_IO
Dim abDioBuff() As Byte
Dim abBuff() As Byte
Dim ab() As Byte
Dim bLocked As Boolean
nSectors = Int((iOffset + Len(sWrite) - 1) / BytesPerSector) + 1
abBuff = DirectReadDrive9x(sDrive, iStartSec, 0, nSectors * BytesPerSector)
ab = StrConv(sWrite, vbFromUnicode)
CopyMemory abBuff(iOffset), ab(0), Len(sWrite)
With dio
.dwStartSector = iStartSec
.wSectors = CInt(nSectors)
.dwBuffer = VarPtr(abBuff(0))
End With
ReDim abDioBuff(LenB(dio) - 1)
CopyMemory abDioBuff(0), dio, LenB(dio)
CopyMemory abDioBuff(6), abDioBuff(8), 4&
With reg
.reg_EAX = &H7305 'function number
.reg_ECX = -1&
.reg_EBX = VarPtr(abDioBuff(0))
.reg_EDX = Asc(UCase(sDrive)) - Asc("A") + 1
.reg_ESI = AreaCode
End With
hDevice = CreateFile("\\.\VWIN32", GENERIC_READ Or GENERIC_WRITE, FILE_SHARE_READ Or FILE_SHARE_WRITE, 0&, OPEN_EXISTING, 0&, 0&)
If hDevice = INVALID_HANDLE_VALUE Then Exit Function
Dim i As Integer
For i = 0 To 3
If LockLogicalVolume(hDevice, Asc(UCase(sDrive)) - Asc("A") + 1, CByte(i), 0) Then
bLocked = True
Exit For
End If
Next i
If Not bLocked Then GoTo WriteError
DirectWriteDrive9x = DeviceIoControl(hDevice, VWIN32_DIOC_DOS_DRIVEINFO, reg, Len(reg), reg, Len(reg), nRead, 0&) And Not (reg.reg_Flags And 1)
Call UnlockLogicalVolume(hDevice, Asc(UCase(sDrive)) - Asc("A") + 1)
WriteError:
CloseHandle hDevice
End Function Private Function LockLogicalVolume(hVWin32 As Long, bDriveNum As Byte, bLockLevel As Byte, wPermissions As Integer) As Boolean
Dim fResult As Boolean
Dim reg As DIOC_REGISTER
Dim bDeviceCat As Byte ' can be either 0x48 or 0x08
Dim cb As Long
' Try first with device category 0x48 for FAT32 volumes. If it
' doesn 't work, try again with device category 0x08. If that
' doesn 't work, then the lock failed.
bDeviceCat = CByte(&H48)
ATTEMPT_AGAIN:
reg.reg_EAX = &H440D&
reg.reg_EBX = MAKEWORD(bDriveNum, bLockLevel)
reg.reg_ECX = MAKEWORD(CByte(&H4A), bDeviceCat)
reg.reg_EDX = wPermissions
fResult = DeviceIoControl(hVWin32, VWIN32_DIOC_DOS_IOCTL, reg, LenB(reg), reg, LenB(reg), cb, ByVal 0&) And Not (reg.reg_Flags And 1)
If (fResult = False) And (bDeviceCat <> CByte(&H8)) Then
bDeviceCat = CByte(&H8)
GoTo ATTEMPT_AGAIN
End If
LockLogicalVolume = fResult
End Function Private Function UnlockLogicalVolume(hVWin32 As Long, bDriveNum As Byte) As Boolean
Dim fResult As Boolean
Dim reg As DIOC_REGISTER
Dim bDeviceCat As Byte ' // can be either 0x48 or 0x08
Dim cb As Long
' Try first with device category 0x48 for FAT32 volumes. If it
' doesn 't work, try again with device category 0x08. If that
' doesn 't work, then the unlock failed.
bDeviceCat = CByte(&H48)
ATTEMPT_AGAIN:
reg.reg_EAX = &H440D&
reg.reg_EBX = bDriveNum
reg.reg_ECX = MAKEWORD(CByte(&H6A), bDeviceCat)
fResult = DeviceIoControl(hVWin32, VWIN32_DIOC_DOS_IOCTL, reg, LenB(reg), reg, LenB(reg), cb, ByVal 0&) And Not (reg.reg_Flags And 1)
If (fResult = False) And (bDeviceCat <> CByte(&H8)) Then
bDeviceCat = CByte(&H8)
GoTo ATTEMPT_AGAIN
End If
UnlockLogicalVolume = fResult
End Function '=============NT staff=============
'Read/Wrire drive with any file system Private Function DirectReadDriveNT(ByVal sDrive As String, ByVal iStartSec As Long, ByVal iOffset As Long, ByVal cBytes As Long) As Variant
Dim hDevice As Long
Dim abBuff() As Byte
Dim abResult() As Byte
Dim nSectors As Long
Dim nRead As Long
nSectors = Int((iOffset + cBytes - 1) / BytesPerSector) + 1
hDevice = CreateFile("\\.\" & UCase(Left(sDrive, 1)) & ":", GENERIC_READ Or GENERIC_WRITE, FILE_SHARE_READ Or FILE_SHARE_WRITE, 0&, OPEN_EXISTING, 0&, 0&)
If hDevice = INVALID_HANDLE_VALUE Then Exit Function
Call SetFilePointer(hDevice, iStartSec * BytesPerSector, 0, FILE_BEGIN)
ReDim abResult(cBytes - 1)
ReDim abBuff(nSectors * BytesPerSector - 1)
Call ReadFile(hDevice, abBuff(0), UBound(abBuff) + 1, nRead, 0&)
CloseHandle hDevice
CopyMemory abResult(0), abBuff(iOffset), cBytes
DirectReadDriveNT = abResult
End Function Private Function DirectWriteDriveNT(ByVal sDrive As String, ByVal iStartSec As Long, ByVal iOffset As Long, ByVal sWrite As String) As Boolean
Dim hDevice As Long
Dim abBuff() As Byte
Dim ab() As Byte
Dim nRead As Long
Dim nSectors As Long
nSectors = Int((iOffset + Len(sWrite) - 1) / BytesPerSector) + 1
hDevice = CreateFile("\\.\" & UCase(Left(sDrive, 1)) & ":", GENERIC_READ Or GENERIC_WRITE, FILE_SHARE_READ Or FILE_SHARE_WRITE, 0&, OPEN_EXISTING, 0&, 0&)
If hDevice = INVALID_HANDLE_VALUE Then Exit Function
abBuff = DirectReadDriveNT(sDrive, iStartSec, 0, nSectors * BytesPerSector)
ab = StrConv(sWrite, vbFromUnicode)
CopyMemory abBuff(iOffset), ab(0), Len(sWrite)
Call SetFilePointer(hDevice, iStartSec * BytesPerSector, 0, FILE_BEGIN)
Call LockFile(hDevice, LoWord(iStartSec * BytesPerSector), HiWord(iStartSec * BytesPerSector), LoWord(nSectors * BytesPerSector), HiWord(nSectors * BytesPerSector))
DirectWriteDriveNT = WriteFile(hDevice, abBuff(0), UBound(abBuff) + 1, nRead, 0&)
Call FlushFileBuffers(hDevice)
Call UnlockFile(hDevice, LoWord(iStartSec * BytesPerSector), HiWord(iStartSec * BytesPerSector), LoWord(nSectors * BytesPerSector), HiWord(nSectors * BytesPerSector))
CloseHandle hDevice
End Function Function MAKEWORD(ByVal bLo As Byte, ByVal bHi As Byte) As Integer
If bHi And &H80 Then
MAKEWORD = (((bHi And &H7F) * 256) + bLo) Or &H8000
Else
MAKEWORD = (bHi * 256) + bLo
End If
End Function
运行上面的代码还需要下面的bas库:http://www.vbcity.com/forums/attachment.asp?id=4000
1、Close #FileHandle1时,VB会自动通知系统将缓存写盘,没听说过还有你这种情况,你的代码肯定有问题。用API,把问题更是绕远了;2、TechnoFantasy(冰儿马甲www.applevb.com)为什么可以连续回复四次?而我最多只能三次?郁闷中