检测到PInvokeStackImbalance [英] PInvokeStackImbalance was detected

问题描述

我昨天收到错误。错误是（检测到PInvokeStackImbalance

消息：调用PInvoke函数'WebCam ScreenShot！WebCam_ScreenShot.Form1 :: SendMessage'使堆栈失衡。这很可能是因为托管PInvoke签名不匹配非托管目标签名。检查PInvoke签名的调用约定和参数是否与目标非托管签名匹配）。这是我的代码： -

 公共 类 Form1 
 私有  Sub  OpenPreviewWindow（）
  Dim  iHeight  As  整数 = picCapture.Height 
  Dim  iWidth  As  整数 = picCapture.Width 
 hHwnd = capCreateCaptureWindowA（iDevice，WS_VISIBLE 或 WS_CHILD， 0 ， 0 ， 640 ， 480 ，picCapture.Handle.ToInt32， 0 ）
    如果 SendMessage（hHwnd，WM_CAP_DRIVER_CONNECT，iDevice，< span class =c ode-digit> 0 ）然后  
 SendMessage（hHwnd，WM_CAP_SET_SCALE， True ， 0 ）
 SendMessage（hHwnd，WM_CAP_SET_PREVIEWRATE， 66 ， 0 ）
 SendMessage（hHwnd，WM_CAP_SET_PREVIEW， True ， 0 ）
 SetWindowPos（hHwnd，HWND_BOTTOM， 0 ， 0 ，picCapture。宽度，picCapture.Height，SWP_NOMOVE 或 SWP_NOZORDER）
 btnSave.Enabled =  True  
 btnStop.Enabled =  True  
 
 btnStart.Enabled =  False  
 其他 
 DestroyWindow（hHwnd）
 btnSave.Enabled =  False  
 结束 如果 
 结束  Sub  

请帮忙。带下划线的行是在vb中显示的错误。感谢提前

解决方案

引用：

...可能是因为托管PInvoke签名与非托管目标签名不匹配...

检查 hHwnd 的数据类型是否正确 - 它必须是 IntPtr 。

另外 iDevice mut是 IntPtr 。

And你有没有定义 WM_CAP_DRIVER_CONNECT 作为 UInteger ？

这有时是由于使用pinvoke声明中的错误调用约定。

你没有显示你的pinvoke方法的声明，所以这是猜测。



由于我不擅长VB，我不确定这是用这种语言声明的。

在c＃中你这样写。

 [DllImport（  user32.dll，CharSet = CharSet.Auto， CallingConvention。 StdCall ）] 
 静态  extern   IntPtr  SendMessage（ IntPtr  hWnd， UInt32 消息， IntPtr  wParam， IntPtr  lParam）; 

CallingConvention.StdCall 是默认值。



有关详细信息，请参阅此链接： pinvoke.net：SendMessage（ user32） [ ^ ]

I am getting an error from yesterday. The error is (PInvokeStackImbalance was detected
Message: A call to PInvoke function 'WebCam ScreenShot!WebCam_ScreenShot.Form1::SendMessage' has unbalanced the stack. This is likely because the managed PInvoke signature does not match the unmanaged target signature. Check that the calling convention and parameters of the PInvoke signature match the target unmanaged signature). This are My codes :-

Public Class Form1
   Private Sub OpenPreviewWindow()
        Dim iHeight As Integer = picCapture.Height
        Dim iWidth As Integer = picCapture.Width
        hHwnd = capCreateCaptureWindowA(iDevice, WS_VISIBLE Or WS_CHILD, 0, 0, 640, 480, picCapture.Handle.ToInt32, 0)
        If SendMessage(hHwnd, WM_CAP_DRIVER_CONNECT, iDevice, 0) Then
            SendMessage(hHwnd, WM_CAP_SET_SCALE, True, 0)
            SendMessage(hHwnd, WM_CAP_SET_PREVIEWRATE, 66, 0)
            SendMessage(hHwnd, WM_CAP_SET_PREVIEW, True, 0)
            SetWindowPos(hHwnd, HWND_BOTTOM, 0, 0, picCapture.Width, picCapture.Height, SWP_NOMOVE Or SWP_NOZORDER)
            btnSave.Enabled = True
            btnStop.Enabled = True

            btnStart.Enabled = False
        Else
            DestroyWindow(hHwnd)
            btnSave.Enabled = False
        End If
    End Sub

Please help in this. The underlined line is error showing in vb. Thanks on advance

解决方案

Quote:

... likely because the managed PInvoke signature does not match the unmanaged target signature ...

Check that the datatype of hHwnd is correct - it must be an IntPtr.
Also iDevice mut be an IntPtr.
And did you define WM_CAP_DRIVER_CONNECT as UInteger?

This is sometimes caused by using the wrong calling convention in the pinvoke declaration.
You don't show the declarations of your pinvoke methods, so this is a guess.

As I am not very good at VB I am not sure how this is declared in this language.
In c# you write like this.

[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention.StdCall)]
static extern IntPtr SendMessage(IntPtr hWnd, UInt32 Msg, IntPtr wParam, IntPtr lParam);

CallingConvention.StdCall is the default value.

See this link for more info: pinvoke.net: SendMessage (user32)[^]

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