How can I include a Timeout with ReadFile - winapi

Question

I have redone some code which was hanging when the result of the szFullCommand returned too much data with WaitForSingleObject. Now I'm getting all of the data into the returned bytes, but how do I tell "ReadFile" to stop? The only marker at the end of the output is a CR/LF pair, but those are all throughout the returned data so I can't really watch for that. Any ideas?
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