【VB技巧】VB管道执行CMD命令并截取输出

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VB 管道执行CMD命令并截取输出模块:

Option Explicit

Public Declare Function CreateProcess Lib "kernel32" Alias "CreateProcessA" (ByVal lpApplicationName As String, ByVal lpCommandLine As String, lpProcessAttributes As SECURITY_ATTRIBUTES, lpThreadAttributes As SECURITY_ATTRIBUTES, ByVal bInheritHandles As Long, ByVal dwCreationFlags As Long, lpEnvironment As Any, ByVal lpCurrentDirectory As String, lpStartupInfo As STARTUPINFO, lpProcessInformation As PROCESS_INFORMATION) As Long
Public Declare Function CloseHandle Lib "kernel32.dll" (ByVal hObject As Long) As Long
Public Declare Function ReadFile Lib "kernel32" (ByVal hFile As Long, lpBuffer As Any, ByVal nNumberOfBytesToRead As Long, lpNumberOfBytesRead As Long, lpOverlapped As Long) As Long
Public Declare Function WaitForSingleObject Lib "kernel32" (ByVal hHandle As Long, ByVal dwMilliseconds As Long) As Long
Public Declare Function CreatePipe Lib "kernel32" (phReadPipe As Long, phWritePipe As Long, lpPipeAttributes As SECURITY_ATTRIBUTES, ByVal nSize As Long) As Long
Public Type STARTUPINFO
    cb                              As Long
    lpReserved                      As String
    lpDesktop                       As String
    lpTitle                         As String
    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 Long
    hStdInput                       As Long
    hStdOutput                      As Long
    hStdError                       As Long
End Type
Public Type PROCESS_INFORMATION
    hProcess                        As Long
    hThread                         As Long
    dwProcessId                     As Long
    dwThreadId                      As Long
End Type
Public Type SECURITY_ATTRIBUTES
    nLength                         As Long
    lpSecurityDescriptor            As Long
    bInheritHandle                  As Long
End Type
Public Const NORMAL_PRIORITY_CLASS  As Long = &H20&
Public Const STARTF_USESTDHANDLES   As Long = &H100&
Public Const STARTF_USESHOWWINDOW   As Long = &H1&
Public Const SW_HIDE                As Long = 0&
Public Const INFINITE               As Long = &HFFFF&

Public Function RunCommand(commandline As String) As String
    Dim si As STARTUPINFO                                                       'used to send info the CreateProcess
    Dim pi As PROCESS_INFORMATION                                               'used to receive info about the created process
    Dim retval As Long                                                          'return value
    Dim hRead As Long                                                           'the handle to the read end of the pipe
    Dim hWrite As Long                                                          'the handle to the write end of the pipe
    Dim sBuffer(0 To 63) As Byte                                                'the buffer to store data as we read it from the pipe
    Dim lgSize As Long                                                          'returned number of bytes read by readfile
    Dim sa As SECURITY_ATTRIBUTES
    Dim strResult As String                                                     'returned results of the command line
    'set up security attributes structure
    With sa
        .nLength = Len(sa)
        .bInheritHandle = 1&                                                    'inherit, needed for this to work
        .lpSecurityDescriptor = 0&
    End With
    'create our anonymous pipe an check for success
    ' note we use the default buffer size
    ' this could cause problems if the process tries to write more than this buffer size
    retval = CreatePipe(hRead, hWrite, sa, 0&)
    If retval = 0 Then
        MsgBox "错误提示:创建管道失败!"
        RunCommand = ""
        Exit Function
    End If
    'set up startup info
    With si
        .cb = Len(si)
        .dwFlags = STARTF_USESTDHANDLES Or STARTF_USESHOWWINDOW                 'tell it to use (not ignore) the values below
        .wShowWindow = SW_HIDE
        .hStdOutput = hWrite                                                    'pass the write end of the pipe as the processes standard output
    End With
    'run the command line and check for success
    retval = CreateProcess(vbNullString, commandline & vbNullChar, sa, sa, 1&, NORMAL_PRIORITY_CLASS, ByVal 0&, vbNullString, si, pi)
    If retval Then
        'wait until the command line finishes
        ' trouble if the app doesn't end, or waits for user input, etc
        WaitForSingleObject pi.hProcess, INFINITE
        'read from the pipe until there's no more (bytes actually read is less than what we told it to)
        Do While ReadFile(hRead, sBuffer(0), 64, lgSize, ByVal 0&)
            'convert byte array to string and append to our result
            strResult = strResult & StrConv(sBuffer(), vbUnicode)
            'TODO = what's in the tail end of the byte array when lgSize is less than 64???
            Erase sBuffer()
            If lgSize 64 Then Exit Do
            DoEvents
        Loop
        'close the handles of the process
        CloseHandle pi.hProcess
        CloseHandle pi.hThread
    Else
        MsgBox "错误提示:创建进程失败!" & vbCrLf
    End If
    'close pipe handles
    CloseHandle hRead
    CloseHandle hWrite
    'return the command line output
    RunCommand = Replace(strResult, vbNullChar, "")
End Function

用法:RunCommand("cmd.exe")

文章来源于lcx.cc:【VB技巧】VB管道执行CMD命令并截取输出

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