2

Time ago I asked this question, it was solved here:

But now, and for unknown reason, the C# or Vb.Net code provided there is not working, and I don't understand why not.

I did some modifications to the original code provided there, but I tested the originals and didn't worked.

What happens is that I can't undide a hidden process, I'm not sure where I'm failing. At first view I think that the handle I get with FindWindowEx does not really corresponds to the handle I want.

These are my P/Invoking function signatures and the showwindow enumeration:

<DllImport("user32.dll", SetLastError:=True, CharSet:=CharSet.Auto, 
           BestFitMapping:=False, ThrowOnUnmappablechar:=True)>
Friend Shared Function FindWindow(
                 ByVal lpClassName As String,
                 ByVal lpWindowName As String
) As IntPtr
End Function

<DllImport("User32.dll", SetLastError:=True, CharSet:=CharSet.Auto, 
           BestFitMapping:=False, ThrowOnUnmappablechar:=True)>
Friend Shared Function FindWindowEx(
                 ByVal hwndParent As IntPtr,
                 ByVal hwndChildAfter As IntPtr,
                 ByVal strClassName As String,
                 ByVal strWindowName As String
) As IntPtr
End Function

<DllImport("user32.dll")>
Friend Shared Function GetWindowThreadProcessId(
                 ByVal hWnd As IntPtr,
                 ByRef processId As Integer
) As Integer
End Function

<DllImport("User32", SetLastError:=False)>
Friend Shared Function ShowWindow(
                 ByVal hwnd As IntPtr,
                 ByVal nCmdShow As ProcessUtil.WindowState
) As <MarshalAs(UnmanagedType.Bool)> Boolean
End Function

Public Enum WindowState As Integer
    Hide = 0
    Normal = 1
    ShowMinimized = 2
    Maximize = 3
    ShowMaximized = Maximize
    ShowNoActivate = 4
    Show = 5
    Minimize = 6
    ShowMinNoActive = 7
    ShowNA = 8
    Restore = 9
    ShowDefault = 10
    ForceMinimize = 11
End Enum

The function:

Public Function SetWindowState(ByVal p As Process,
                               ByVal windowState As ProcessUtil.WindowState) As Boolean

    Dim pHandle As IntPtr = IntPtr.Zero
    Dim pid As Integer

    ' If window is visible then...
    If (p.MainWindowHandle <> IntPtr.Zero) Then
        Return ProcessUtil.NativeMethods.ShowWindow(p.MainWindowHandle, windowState)

    Else ' window is hidden.

        ' Check all open windows (not only the process we are looking), 
        ' begining from the child of the desktop.
        While (pid <> p.Id)

            ' Get child handle of window who's handle is "pHandle".
            pHandle = NativeMethods.FindWindowEx(IntPtr.Zero, pHandle, Nothing, Nothing)

            ' Get PID from "pHandle".
            NativeMethods.GetWindowThreadProcessId(pHandle, pid)

        End While

        Return NativeMethods.ShowWindow(pHandle, windowState)

    End If

End Function

And the way that I'm trying to test the function, where first I hide the window of notepad process, then I try to unhide it.

Dim p As Process = Process.GetProcessesByName("notepad").First
ProcessUtil.SetWindowState(p, ProcessUtil.WindowState.Hide)

' I find again the process to renew the "p.MainWindowHandle" as IntPtr.Zero.
p = Process.GetProcessesByName("notepad").First
ProcessUtil.SetWindowState(p, ProcessUtil.WindowState.Restore)
4

2 に答える 2

2

メモ帳の問題は、3 つのウィンドウ ( spy++、クラス名) があることです。

1.「メモ帳」
2.「MSCTFIME UI」
3.「IME」

2番目のハンドル（とにかく取得しました）、MSCTFIME UIを取得しているため、表示できません。正しいハンドルを取得するには、クラス名メモ帳を指定する必要があります。

pHandle = FindWindowEx(IntPtr.Zero, pHandle, "Notepad", Nothing)
于 2015-11-07T07:42:27.310 に答える