windows - SEEK_FAILURE 如果文件超过 4.1 GB，SetFilePointer 失败怎么办

Question

If SetFilePointer(hFile, 0&, ByVal 0&, FILE_END) _
    = INVALID_SET_FILE_POINTER Then

此调用引发了 HBF_SEEK_FAILURE 错误 (45603) 在某个时间点。

解码后的 API 错误信息为:

Seek Error 
Error 87 
Wrong parameter

我认为当文件大小超过 4.1 GB 时它会失败。

我该怎么做才能解决这个问题？

我读过 here，如果文件超过 4 GB，则此错误是有效响应。那么我应该忽略它吗？

根据建议，我现在使用的是 Ex 版本，但是我得到了 Wrong DLL Calling Convention 错误:

Public Sub SeekEnd()
    RaiseErrorIfClosed
        
    If SetFilePointerEx(hFile, 0&, ByVal 0&, FILE_END) _
        = INVALID_SET_FILE_POINTER Then
            RaiseError HBF_SEEK_FAILURE
    End If
End Sub

谢谢!

Answer 1

简单的解决方案；改为调用 SetFilePointerEx。

如果你想继续对大文件使用 SetFilePointer，那么你应该将 lpDistanceToMoveHigh 参数设置为一个有效的指针(在这种特定情况下它可能指向一个值为 0 的值)。

设置 lpDistanceToMoveHigh 后，您可以像这样检查返回值:

If SetFilePointer(...) = INVALID_SET_FILE_POINTER _
AndAlso If Not Err.LastDLLError = 0
  ' Handle error
Else
  ' Success
End If

这里是使用SetFilePointerEx的版本

Private Declare Function SetFilePointerEx Lib "kernel32" ( _
        ByVal hFile As Long, _
        ByVal liDistanceToMove As Currency, _
        ByRef lpNewFilePointer As Currency, _
        ByVal dwMoveMethod As Long) As Boolean

Public Function SeekEOF() As Currency
'++++++ NEW
' Seek to a base 0 EOF and return the pointer position
' The returned value is the new ABSOLUTE pointer positon.
    Dim RetVal As Long
    Dim tmpPosition As Currency
    Dim returnedPosition As Currency
    RaiseErrorIfClosed
    tmpPosition = 0@
    RetVal = SetFilePointerEx(hFile, (tmpPosition), returnedPosition, FILE_END) ' seek relative to the END of the file. thius returns a pointer to the final byte ?
    If RetVal = 0 Then  ' failed
        RaiseError HBFH_SEEK_FAILURE
    End If
    fCurrentPointerPosition = (returnedPosition) * 10000@
    If fCurrentPointerPosition <> Me.fileSize() Then 'gosh, what could have happened ? BASE 0 compared to BASE 1 position should=file size (ie 1 past the last byte!)
        RaiseError HBFH_SEEK_FAILURE
    End If
    SeekEOF = fCurrentPointerPosition ' returns the BASE 0 absolute pointer positon which is 1 past the last byte
End Function