私はまだこれを機能させることができていないのではないかと心配していますが、他の誰かが試してみることができるかもしれません. アイデアは、コンソールの std 入力で非同期 I/O を使用することでした (アプリのアイデアは、ユーザーがコンソール ウィンドウに直接書き込み、入力を読み取れるようにすることだと思います)。
すべての API をモジュール (MAsynchConsole) に分離しました。
Option Explicit
Private Const GENERIC_READ As Long = &H80000000
Private Const GENERIC_WRITE As Long = &H40000000
Private Const OPEN_EXISTING As Long = 3&
Private Const FILE_FLAG_OVERLAPPED As Long = &H40000000
Private Const FILE_SHARE_READ As Long = &H1
Private Const FILE_FLAG_NO_BUFFERING As Long = &H20000000
Private Type OVERLAPPED
Internal As Long
InternalHigh As Long
OffsetOrPointer As Long
OffsetHigh As Long
hEvent As Long
End Type
Private Type OVERLAPPED_ENTRY
lpCompletionKey As Long
lpOverlapped As Long ' pointer to OVERLAPPED
Internal As Long
dwNumberOfBytesTransferred As Long
End Type
Private Declare Function AllocConsole Lib "kernel32" () As Long
Private Declare Function CancelIo Lib "Kernel32.dll" ( _
ByVal hFile As Long _
) As Long
Private Declare Function CreateFile Lib "Kernel32.dll" Alias "CreateFileW" ( _
ByVal lpFileName As Long, _
ByVal dwDesiredAccess As Long, _
ByVal dwShareModen As Long, _
ByRef lpSecurityAttributes As Any, _
ByVal dwCreationDisposition As Long, _
ByVal dwFlagsAndAttributes As Long, _
ByVal hTemplateFile As Long _
) As Long
Private Declare Function FreeConsole Lib "kernel32" () As Long
Private Declare Function GetStdHandle Lib "kernel32" ( _
ByVal nStdHandle As Long _
) As Long
Private Declare Function ReadFile Lib "Kernel32.dll" ( _
ByVal hFile As Long, _
ByVal lpBuffer As Long, _
ByVal nNumberOfBytesToRead As Long, _
ByRef lpNumberOfBytesRead As Long, _
ByRef lpOverlapped As OVERLAPPED _
) As Long
Private Declare Function ReadFileEx Lib "Kernel32.dll" ( _
ByVal hFile As Long, _
ByVal lpBuffer As Long, _
ByVal nNumberOfBytesToRead As Long, _
ByRef lpOverlapped As OVERLAPPED, _
ByVal lpCompletionRoutine As Long _
) As Long
Private Declare Function CloseHandle Lib "kernel32" (ByVal hObject As Long) As Long
Private m_hStdIn As Long
Private m_uOverlapped As OVERLAPPED
Private m_sUnicodeBuffer As String
Private m_oReadCallback As IReadCallback
Public Sub CloseConsole()
CancelIo m_hStdIn
Set m_oReadCallback = Nothing
m_sUnicodeBuffer = vbNullString
CloseHandle m_hStdIn
FreeConsole
End Sub
Private Sub FileIOCompletionRoutine( _
ByVal dwErrorCode As Long, _
ByVal dwNumberOfBytesTransfered As Long, _
ByRef uOverlapped As OVERLAPPED _
)
On Error GoTo ErrorHandler
m_oReadCallback.DataRead "FileIOCompletionRoutine"
m_oReadCallback.DataRead "dwErrorCode = " & CStr(dwErrorCode)
If dwErrorCode Then
MsgBox "Error = " & CStr(dwErrorCode)
CloseConsole
Exit Sub
End If
m_oReadCallback.DataRead "dwNumberOfBytesTransfered = " & CStr(dwNumberOfBytesTransfered)
m_oReadCallback.DataRead Left$(m_sUnicodeBuffer, dwNumberOfBytesTransfered)
Exit Sub
ErrorHandler:
'
End Sub
Public Sub OpenConsoleForInput(ByRef the_oReadCallback As IReadCallback)
Dim sFileName As String
On Error GoTo ErrorHandler
Set m_oReadCallback = the_oReadCallback
AllocConsole
'm_hStdIn = GetStdHandle(-10&)
sFileName = "CONIN$"
'm_hStdIn = CreateFile(StrPtr(sFileName), GENERIC_READ, FILE_SHARE_READ, ByVal 0&, OPEN_EXISTING, 0&, 0&)
m_hStdIn = CreateFile(StrPtr(sFileName), GENERIC_READ Or GENERIC_WRITE, FILE_SHARE_READ, ByVal 0&, OPEN_EXISTING, FILE_FLAG_OVERLAPPED, 0&)
m_oReadCallback.DataRead "m_hStdIn = " & CStr(m_hStdIn)
m_oReadCallback.DataRead "LastError = " & CStr(Err.LastDllError)
m_sUnicodeBuffer = Space$(8192)
Exit Sub
ErrorHandler:
Err.Raise Err.Number, Err.Source, Err.Description
End Sub
Public Sub Read()
Dim nRet As Long
Dim nBytesRead As Long
On Error GoTo ErrorHandler
m_oReadCallback.DataRead "About to call ReadFileExe"
'm_uOverlapped.OffsetHigh = 0&
'm_uOverlapped.OffsetOrPointer = 0&
'nRet = ReadFile(m_hStdIn, StrPtr(m_sUnicodeBuffer), LenB(m_sUnicodeBuffer), nBytesRead, m_uOverlapped)
nRet = ReadFileEx(m_hStdIn, StrPtr(m_sUnicodeBuffer), LenB(m_sUnicodeBuffer), m_uOverlapped, AddressOf FileIOCompletionRoutine)
m_oReadCallback.DataRead "nRet = " & CStr(nRet)
m_oReadCallback.DataRead "nBytesRead = " & CStr(nBytesRead)
If nRet = 0 Then
m_oReadCallback.DataRead "Err.LastDllError = " & CStr(Err.LastDllError)
Else
m_oReadCallback.DataRead StrConv(Left$(m_sUnicodeBuffer, nBytesRead), vbUnicode)
End If
Exit Sub
ErrorHandler:
Err.Raise Err.Number, Err.Source, Err.Description
End Sub
これは、インターフェイス (IReadCallback) に依存してメイン GUI と通信します。
Option Explicit
Public Sub DataRead(ByRef out_sData As String)
'
End Sub
これは私のサンプル フォーム (FAsynchConsoleTest) で、タイマー (Timer) と RichTextBox (txtStdIn) を使用します。
Option Explicit
Implements IReadCallback
Private Sub Form_Load()
MAsynchConsole.OpenConsoleForInput Me
Timer.Enabled = True
End Sub
Private Sub Form_Unload(Cancel As Integer)
MAsynchConsole.CloseConsole
End Sub
Private Sub IReadCallback_DataRead(out_sData As String)
txtStdIn.SelStart = Len(txtStdIn.Text)
txtStdIn.SelText = vbNewLine & out_sData
End Sub
Private Sub mnuTimerOff_Click()
Timer.Enabled = False
End Sub
Private Sub mnuTimerOn_Click()
Timer.Enabled = True
End Sub
Private Sub Timer_Timer()
MAsynchConsole.Read
End Sub
残念ながら、FILE_FLAG_OVERLAPPED を使用する CreateFile() は、非同期 I/O で使用できるファイル ハンドルを作成する必要があり、そのハンドルは有効に見えますが、ReadFileEx() は 0 を返し、GetLastError は 6 です。
//
// MessageId: ERROR_INVALID_HANDLE
//
// MessageText:
//
// The handle is invalid.
//
#define ERROR_INVALID_HANDLE 6L
興味深いことに、これがすべて発生している間、コンソールはフリーズします。
他に何かアイデアはありますか？ドキュメントは、コンソール デバイス名で CreateFile() を使用すると、パラメーターが無視されることを示唆しているようです。