为什么这将在32位运行，而不是64位？ （编译器选项中的x86 vs x64）

Question

我正在使用以下代码进行迭代，并在标题栏中找到包含特定字符串的窗口。我有两个包含相同信息的项目，但出于某种原因 - 它在针对x64时有效，但FindWindowLike总是在x86上返回0。我需要这个在x86中运行。

我在Windows 7 x64上开发它，但它需要在我的机器和XPx32上运行。我无法理解的是为什么它在x64上编译/运行而不是x32（考虑到我的目标是用户 32 .dll）

代码如下：

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

    <DllImport("user32.dll", EntryPoint:="FindWindow", SetLastError:=True, CharSet:=CharSet.Auto)> Private Shared Function FindWindowByClass(ByVal lpClassName As String, ByVal zero As IntPtr) As IntPtr
    End Function

    <DllImport("user32.dll", EntryPoint:="FindWindow", SetLastError:=True, CharSet:=CharSet.Auto)> Private Shared Function FindWindowByCaption(ByVal zero As IntPtr, ByVal lpWindowName As String) As IntPtr
    End Function

    <DllImport("user32.dll", CharSet:=CharSet.Auto, ExactSpelling:=True)> Public Shared Function IsWindow(ByVal hWnd As IntPtr) As Boolean
    End Function

    Private Declare Function GetDC Lib "user32.dll" (ByVal hwnd As IntPtr) As IntPtr
    Private Declare Function ReleaseDC Lib "user32.dll" (ByVal hwnd As IntPtr, ByVal hdc As IntPtr) As IntPtr
    Public Declare Function GetDesktopWindow Lib "user32" () As Long
    Public Declare Function GetWindow Lib "user32" (ByVal hwnd As Long, ByVal wCmd As Long) As Long
    Public Declare Function GetWindowText Lib "user32" Alias "GetWindowTextA" (ByVal hwnd As Long, ByVal lpString As String, ByVal cch As Long) As Long
    Public Declare Function GetClassName Lib "user32" Alias "GetClassNameA" (ByVal hwnd As Long, ByVal lpClassName As String, ByVal nMaxCount As Long) As Long
    Public Const GW_HWNDFIRST = 0
    Public Const GW_HWNDLAST = 1
    Public Const GW_HWNDNEXT = 2
    Public Const GW_HWNDPREV = 3
    Public Const GW_OWNER = 4
    Public Const GW_CHILD = 5
    Public listWindows As New List(Of String)

Private Function FindWindows() As Long
        Dim hWndStart As Long = 0
        Dim WindowText As String = "*message*"
        Dim Classname As String = "*"
        Dim hwnd As Long
        Dim sWindowText As String
        Dim sClassname As String
        Dim r As Long

        'Hold the level of recursion and
        'hold the number of matching windows
        Static level As Integer

        'Initialize if necessary. This is only executed 
        'when level = 0 and hWndStart = 0, normally 
        'only on the first call to the routine.
        If level = 0 Then
            If hWndStart = 0 Then hWndStart = GetDesktopWindow()
        End If

        'Increase recursion counter      
        level = level + 1

        'Get first child window
        hwnd = GetWindow(hWndStart, GW_CHILD)

        Do Until hwnd = 0

            'Search children by recursion
            Call FindWindows()

            'Get the window text and class name
            sWindowText = Space$(255)
            r = GetWindowText(hwnd, sWindowText, 255)
            sWindowText = Microsoft.VisualBasic.Left(sWindowText, r)
            sClassname = Space$(255)
            r = GetClassName(hwnd, sClassname, 255)
            sClassname = Microsoft.VisualBasic.Left(sClassname, r)

            'Check if window found matches the search parameters
            If (sWindowText Like WindowText) And (sClassname Like Classname) Then
                If listWindows.Contains(hwnd & "||||" & sClassname & "||||" & sWindowText) = False Then
                    listWindows.Add(hwnd & "||||" & sClassname & "||||" & sWindowText)
                End If
                FindWindows = hwnd

                'uncommenting the next line causes the routine to
                'only return the first matching window.
                'Exit Do

            End If

            'Get next child window
            hwnd = GetWindow(hwnd, GW_HWNDNEXT)

        Loop

        'Reduce the recursion counter
        level = level - 1
End Function

Answer 1

您的功能定义错误。在C LONG中是32位宽，但在C＃和VB.NET中long在32位和64位系统上都是64位宽。此外，您的窗口句柄参数应为IntPtr s。

Private Declare Function GetDC Lib "user32.dll" (ByVal hwnd As IntPtr) As IntPtr
Private Declare Function ReleaseDC Lib "user32.dll" (ByVal hwnd As IntPtr, ByVal hdc As IntPtr) As IntPtr
Private Declare Function GetDesktopWindow Lib "user32" () As IntPtr
Private Declare Function GetWindow Lib "user32" (ByVal hwnd As IntPtr, ByVal wCmd As Integer) As IntPtr
Private Declare Function GetWindowText Lib "user32" Alias "GetWindowTextA" (ByVal hwnd As IntPtr, ByVal lpString As String, ByVal cch As Integer) As Integer
Private Declare Function GetClassName Lib "user32" Alias "GetClassNameA" (ByVal hwnd As IntPtr, ByVal lpClassName As String, ByVal nMaxCount As Integer) As Integer

请注意，您不应将String传递给GetWindowText和GetClassName。试试StringBuilder。

Answer 2

另一条建议是结束目标32＆amp; 64位系统。以下是GetWindowLong的示例：

Public Shared Function GetWindowLong(ByVal hWnd As HandleRef, ByVal nIndex As Integer) As IntPtr
    If (IntPtr.Size = 4) Then
        Return NativeMethods.GetWindowLong32(hWnd, nIndex)
    End If
    Return NativeMethods.GetWindowLongPtr64(hWnd, nIndex)
End Function

正如nobugz所说，你可以看看pinvoke.net。我更喜欢使用反射器，并确切地看到框架如何处理它。