请教：在VB中，使用shell调用了一个批处理，如何判断是否执行完成

[derbywgz]

在VB当中，使用shell调用了两个bat文件

需要在第一个bat文件执行完成后，执行第二个

目前的情况是，第一个执行了，没有执行完成，就开始执行第二个了，导致出现结果不正确

请高手赐教，谢谢！！

[samtyty]

Public Const SYNCHRONIZE = &H100000
Public Const INFINITE = &HFFFFFFFF

Declare Function OpenProcess Lib "kernel32" (ByVal dwDesiredAccess As Long, ByVal bInheritHandle As Long, ByVal dwProcessId As Long) As Long
Declare Function CloseHandle Lib "kernel32" (ByVal hObject As Long) As Long

Declare Function WaitForSingleObject Lib "kernel32" (ByVal hHandle As Long, ByVal dwMilliseconds As Long) As Long



    Dim pId As Long, pHnd As Long ' 分别声明 Process Id 及 Process Handle 变数
    Dim CVtemp As String, CVarray As Variant
    pId = Shell(App.Path & "\" & sim, 0) ' Shell 传回 Process Id
    pHnd = OpenProcess(SYNCHRONIZE, 0, pId) ' 取得 Process Handle
    If pHnd <> 0 Then
        Call WaitForSingleObject(pHnd, INFINITE) ' 无限等待，直到程序结束
        Call CloseHandle(pHnd)
    End If

这是我自己一个程序中的代码，你凑合着看看，自己修改一下吧，
关键是这一句吧：Call WaitForSingleObject(pHnd, INFINITE) ' 无限等待，直到程序结束

[chinaboyzyq]

你在第一个批处理文件的末尾加第二个bat不就行，
干嘛用两次shell呢？

[samtyty]

Public Const SYNCHRONIZE = &H100000
Public Const INFINITE = &HFFFFFFFF

Declare Function OpenProcess Lib "kernel32" (ByVal dwDesiredAccess As Long, ByVal bInheritHandle As Long, ByVal dwProcessId As Long) As Long
Declare Function CloseHandle Lib "kernel32" (ByVal hObject As Long) As Long

Declare Function WaitForSingleObject Lib "kernel32" (ByVal hHandle As Long, ByVal dwMilliseconds As Long) As Long



    Dim pId As Long, pHnd As Long ' 分别声明 Process Id 及 Process Handle 变数
    Dim CVtemp As String, CVarray As Variant
    pId = Shell(App.Path & "\" & sim, 0) ' Shell 传回 Process Id
    pHnd = OpenProcess(SYNCHRONIZE, 0, pId) ' 取得 Process Handle
    If pHnd <> 0 Then
        Call WaitForSingleObject(pHnd, INFINITE) ' 无限等待，直到程序结束
        Call CloseHandle(pHnd)
    End If

这是我自己一个程序中的代码，你凑合着看看，自己修改一下吧，
关键是这一句吧：Call WaitForSingleObject(pHnd, INFINITE) ' 无限等待，直到程序结束

[chinaboyzyq]

你在第一个批处理文件的末尾加第二个bat不就行了，
干嘛用两次shell两个bat呢？

[derbywgz]

及时将批处理合并了，还是要判断批处理执行的结果，这样

还是要等待批处理执行完成

[samtyty]

估计楼主是等第一个bat执行完后，从里面获取一些结果，然后执行第二个bat，我的程序就是要等执行完后，从输出的结果中提取一些参数，然后进行下一步计算

[derbywgz]

是要等第一个批处理的结果

Public Const SYNCHRONIZE = &H100000
Public Const INFINITE = &HFFFFFFFF

这个定义在VB中怎么是红色的？？

[chinaboyzyq]

不知道你批处理里面调用的是什么？

[chinaboyzyq]

[Quote=引用 6 楼 samtyty 的回复:]
估计楼主是等第一个bat执行完后，从里面获取一些结果，然后执行第二个bat，我的程序就是要等执行完后，从输出的结果中提取一些参数，然后进行下一步计算
[/Quote]

可不可以用timer控件比如10秒一判断，如果有想要的结果则进行第二个BAT，没有就不执行，我觉得这样简单些。

[derbywgz]

用定时器倒是不错
不过没有用过定时器，怎么用呢，请指教，谢谢！

[chinaboyzyq]

添加timer控件，设置它的设置它的Interval 为10000,这是10秒，1000为1秒

双击timer控件，然后添加你的判断程序。

[derbywgz]

如何启动定时器？

就是说我在执行完批处理后，启动定时器？

[神马都能聊]

用findwindow找dos窗口是否可用呢？

[chinaboyzyq]

[Quote=引用 12 楼 derbywgz 的回复:]
如何启动定时器？

就是说我在执行完批处理后，启动定时器？
[/Quote]

定时器默认从程序启动时开始启动。
当然你可先关闭它，用tiemr1.enabled=false关闭，用timer1.enabled=ture打开。

[fzx4936]

1楼的代码基本上可以做为同步调用检查的通用模块了

[lqnoway]

以下是老外写的一个类，用来获得dos命令的执行结果。

Option Explicit
'DOSOutputs.cls
'The CreatePipe function creates an anonymous pipe,
'and returns handles to the read and write ends of the pipe.
Private Declare Function CreatePipe Lib "kernel32" ( _
    phReadPipe As Long, _
    phWritePipe As Long, _
    lpPipeAttributes As Any, _
    ByVal nSize As Long) As Long

'Used to read the the pipe filled by the process create
'with the CretaProcessA function
Private Declare Function ReadFile Lib "kernel32" ( _
    ByVal hFile As Long, _
    ByVal lpBuffer As String, _
    ByVal nNumberOfBytesToRead As Long, _
    lpNumberOfBytesRead As Long, _
    ByVal lpOverlapped As Any) As Long

'Structure used by the CreateProcessA function
Private Type SECURITY_ATTRIBUTES
    nLength As Long
    lpSecurityDescriptor As Long
    bInheritHandle As Long
End Type

'Structure used by the CreateProcessA function
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 Long
    hStdInput As Long
    hStdOutput As Long
    hStdError As Long
End Type

'Structure used by the CreateProcessA function
Private Type PROCESS_INFORMATION
    hProcess As Long
    hThread As Long
    dwProcessID As Long
    dwThreadID As Long
End Type

'This function launch the the commend and return the relative process
'into the PRECESS_INFORMATION structure
Private Declare Function CreateProcessA Lib "kernel32" ( _
    ByVal lpApplicationName As Long, _
    ByVal lpCommandLine As String, _
    lpProcessAttributes As SECURITY_ATTRIBUTES, _
    lpThreadAttributes As SECURITY_ATTRIBUTES, _
    ByVal bInheritHandles As Long, _
    ByVal dwCreationFlags As Long, _
    ByVal lpEnvironment As Long, _
    ByVal lpCurrentDirectory As Long, _
    lpStartupInfo As STARTUPINFO, _
    lpProcessInformation As PROCESS_INFORMATION) As Long

'Close opened handle
Private Declare Function CloseHandle Lib "kernel32" ( _
    ByVal hHandle As Long) As Long

'Consts for the above functions
Private Const NORMAL_PRIORITY_CLASS = &H20&
Private Const STARTF_USESTDHANDLES = &H100&
Private Const STARTF_USESHOWWINDOW = &H1


Private mCommand As String          'Private variable for the CommandLine property
Private mOutputs As String          'Private variable for the ReadOnly Outputs property

'Event that notify the temporary buffer to the object
Public Event ReceiveOutputs(CommandOutputs As String)

'This property set and get the DOS command line
'It's possible to set this property directly from the
'parameter of the ExecuteCommand method
Public Property Let CommandLine(DOSCommand As String)
    mCommand = DOSCommand
End Property

Public Property Get CommandLine() As String
    CommandLine = mCommand
End Property

'This property ReadOnly get the complete output after
'a command execution
Public Property Get Outputs()
    Outputs = mOutputs
End Property

Public Function ExecuteCommand(Optional CommandLine As String) As String
    Dim proc As PROCESS_INFORMATION     'Process info filled by CreateProcessA
    Dim ret As Long                     'long variable for get the return value of the
                                        'API functions
    Dim start As STARTUPINFO            'StartUp Info passed to the CreateProceeeA
                                        'function
    Dim sa As SECURITY_ATTRIBUTES       'Security Attributes passeed to the
                                        'CreateProcessA function
    Dim hReadPipe As Long               'Read Pipe handle created by CreatePipe
    Dim hWritePipe As Long              'Write Pite handle created by CreatePipe
    Dim lngBytesread As Long            'Amount of byte read from the Read Pipe handle
    Dim strBuff As String * 256         'String buffer reading the Pipe

    'if the parameter is not empty update the CommandLine property
    If Len(CommandLine) > 0 Then
        mCommand = CommandLine
    End If
    
    'if the command line is empty then exit whit a error message
    If Len(mCommand) = 0 Then
        MsgBox "Command Line empty", vbCritical
        Exit Function
    End If
    
    'Create the Pipe
    sa.nLength = Len(sa)
    sa.bInheritHandle = 1&
    sa.lpSecurityDescriptor = 0&
    ret = CreatePipe(hReadPipe, hWritePipe, sa, 0)
    
    If ret = 0 Then
        'If an error occur during the Pipe creation exit
        MsgBox "CreatePipe failed. Error: " & Err.LastDllError, vbCritical
        Exit Function
    End If
    
    'Launch the command line application
    start.cb = Len(start)
    start.dwFlags = STARTF_USESTDHANDLES Or STARTF_USESHOWWINDOW
    'set the StdOutput and the StdError output to the same Write Pipe handle
    start.hStdOutput = hWritePipe
    start.hStdError = hWritePipe
    'Execute the command
    ret& = CreateProcessA(0&, mCommand, sa, sa, 1&, _
        NORMAL_PRIORITY_CLASS, 0&, 0&, start, proc)
        
    If ret <> 1 Then
        'if the command is not found ....
        MsgBox "File or command not found", vbCritical
        Exit Function
    End If
    
    'Now We can ... must close the hWritePipe
    ret = CloseHandle(hWritePipe)
    mOutputs = ""
    
    'Read the ReadPipe handle
    Do
        ret = ReadFile(hReadPipe, strBuff, 256, lngBytesread, 0&)
        mOutputs = mOutputs & Left(strBuff, lngBytesread)
        'Send data to the object via ReceiveOutputs event
        RaiseEvent ReceiveOutputs(Left(strBuff, lngBytesread))
    Loop While ret <> 0
    
    'Close the opened handles
    ret = CloseHandle(proc.hProcess)
    ret = CloseHandle(proc.hThread)
    ret = CloseHandle(hReadPipe)
    
    'Return the Outputs property with the entire DOS output
    ExecuteCommand = mOutputs
End Function

[derbywgz]

多谢各位，我使用了最简单的，定时器方式

[evilteam]

定时器的方法不好！
一楼的最科学了····