如何在ReadFile中包含Timeout

Question

我重做了一些代码，当szFullCommand的结果用WaitForSingleObject返回太多数据时，这些代码挂起。现在我将所有数据都输入到返回的字节中，但是如何告诉“ReadFile”停止？输出结尾的唯一标记是CR / LF对，但这些都是返回的数据，所以我无法真正注意到这一点。有什么想法吗？

    Option Explicit

    Private Type SECURITY_ATTRIBUTES
        nLength As Long
        lpSecurityDescriptor As Long
        bInheritHandle As Long
    End Type

    Private Type PROCESS_INFORMATION
        hProcess As Long
        hThread As Long
        dwProcessId As Long
        dwThreadId As Long
    End Type

    Private Type STARTUPINFO
        cb As Long
        lpReserved As Long
        lpDesktop As Long
        lpTitle As Long
        dwX As Long
        dwY As Long
        dwXSize As Long
        dwYSize As Long
        dwXCountChars As Long
        dwYCountChars As Long
        dwFillAttribute As Long
        dwFlags As Long
        wShowWindow As Integer
        cbReserved2 As Integer
        lpReserved2 As Byte
        hStdInput As Long
        hStdOutput As Long
        hStdError As Long
    End Type

    Private Const WAIT_LONG             As Long = 60000
    Private Const WAIT_INFINITE         As Long = (-1&)
    Private Const STARTF_USESHOWWINDOW  As Long = &H1
    Private Const STARTF_USECOUNTCHARS  As Long = &H8
    Private Const STARTF_USESTDHANDLES  As Long = &H100
    Private Const SW_HIDE               As Long = 0&
    Private Const SW_SHOWNORMAL         As Long = 1

    Private Declare Function CreatePipe Lib "kernel32" (phReadPipe As Long, phWritePipe As Long, lpPipeAttributes As SECURITY_ATTRIBUTES, ByVal nSize As Long) As Long
    Private Declare Function CreateProcess Lib "kernel32" Alias "CreateProcessA" (ByVal lpApplicationName As Long, ByVal lpCommandLine As String, lpProcessAttributes As Any, lpThreadAttributes As Any, ByVal bInheritHandles As Long, ByVal dwCreationFlags As Long, lpEnvironment As Any, ByVal lpCurrentDriectory As String, lpStartupInfo As STARTUPINFO, lpProcessInformation As PROCESS_INFORMATION) As Long
    Private Declare Function ReadFile Lib "kernel32" (ByVal hFile As Long, lpBuffer As Any, ByVal nNumberOfBytesToRead As Long, lpNumberOfBytesRead As Long, lpOverlapped As Any) As Long
    Private Declare Function CloseHandle Lib "kernel32" (ByVal hObject As Long) As Long
    Private Declare Function WaitForSingleObject Lib "kernel32" (ByVal hHandle As Long, ByVal dwMilliseconds As Long) As Long
    Private Declare Function GetExitCodeProcess Lib "kernel32" (ByVal hProcess As Long, lpExitCode As Long) As Long
    Private Declare Sub GetStartupInfo Lib "kernel32" Alias "GetStartupInfoA" (lpStartupInfo As STARTUPINFO)
    Private Declare Function GetFileSize Lib "kernel32" (ByVal hFile As Long, lpFileSizeHigh As Long) As Long

    Public Function Redirect(szBinaryPath As String, szCommandLn As String) As String
        Dim tSA_CreatePipe              As SECURITY_ATTRIBUTES
        Dim tSA_CreateProcessPrc        As SECURITY_ATTRIBUTES
        Dim tSA_CreateProcessThrd       As SECURITY_ATTRIBUTES
        Dim tSA_CreateProcessPrcInfo    As PROCESS_INFORMATION
        Dim tStartupInfo                As STARTUPINFO
        Dim hRead                       As Long
        Dim hWrite                      As Long
        Dim bRead                       As Long
        Dim abytBuff()                  As Byte
        Dim lngResult                   As Long
        Dim szFullCommand               As String
        Dim lngExitCode                 As Long
        Dim lngSizeOf                   As Long
        Dim intReturn                   As Integer
        Dim byteRead(100000)            As Byte
        Dim byteTemp                    As Byte
        Dim intByteCounter              As Integer
        Dim intStillProcessing          As Integer
        Dim intCounter                  As Integer

        tSA_CreatePipe.nLength = Len(tSA_CreatePipe)
        tSA_CreatePipe.lpSecurityDescriptor = 0&
        tSA_CreatePipe.bInheritHandle = True

        tSA_CreateProcessPrc.nLength = Len(tSA_CreateProcessPrc)
        tSA_CreateProcessThrd.nLength = Len(tSA_CreateProcessThrd)

        If (CreatePipe(hRead, hWrite, tSA_CreatePipe, 0&) <> 0&) Then
            tStartupInfo.cb = Len(tStartupInfo)
            GetStartupInfo tStartupInfo

            With tStartupInfo
                .hStdOutput = hWrite
                .hStdError = hWrite
                .dwFlags = STARTF_USESHOWWINDOW Or STARTF_USESTDHANDLES
                .wShowWindow = SW_HIDE
            End With

            szFullCommand = """" & szBinaryPath & """" & " " & szCommandLn
            frmCszKUpNS.FullCommand.Text = szFullCommand

            lngResult = CreateProcess(0&, szFullCommand, tSA_CreateProcessPrc, tSA_CreateProcessThrd, _
                                      True, 0&, 0&, vbNullString, tStartupInfo, tSA_CreateProcessPrcInfo)

            ' All of this works great until there is no data left from the output of the command
            ' Then the ReadFile line hangs forever
            intByteCounter = 0
            intStillProcessing = 1
            While intStillProcessing = 1
                If ReadFile(hRead, byteTemp, 1, bRead, ByVal 0&) Then
                    byteRead(intByteCounter) = byteTemp
                Else
                    intStillProcessing = 0
                End If
                intByteCounter = intByteCounter + 1
            Wend

            ReDim abytBuff(intByteCounter)
            For intCounter = 0 To intByteCounter
                abytBuff(intCounter) = byteRead(intCounter)
            Next intCounter
            Redirect = StrConv(abytBuff, vbUnicode)

            Call GetExitCodeProcess(tSA_CreateProcessPrcInfo.hProcess, lngExitCode)
            CloseHandle tSA_CreateProcessPrcInfo.hThread
            CloseHandle tSA_CreateProcessPrcInfo.hProcess

            If (lngExitCode <> 0&) Then Err.Raise vbObject + 1235&, "GetExitCodeProcess", "Non-zero Application exist code"
                CloseHandle hWrite
                CloseHandle hRead
            Else
                Err.Raise vbObject + 1236&, "CreateProcess", "CreateProcess Failed, Code: " & Err.LastDllError
            End If
        End If
    End Function