PInvokeStackImbalance was detected

Question

0.00/5 (No votes)

See more:

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 :-

VB

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

Posted 10-Sep-14 19:10pm

JoshuaDsouza19

Updated 10-Sep-14 20:33pm

George Jonsson

v2

Add a Solution

2 solutions

Add a Solution

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Bernhard Hiller · Answer 1 · 2014-09-10T20:26:00

Solution 1

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?

Posted 10-Sep-14 20:26pm

Bernhard Hiller

Comments

Bernhard Hiller 12-Sep-14 2:27am

If you do not understand that, then the things you try are still beyond your capabilities. Sorry for these hard words, but they are true.

Member 10874152 15-Mar-15 6:02am

i'have check this "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?"

but it's don't work?

can you fix it ?

George Jonsson · Answer 2 · 2014-09-10T20:43:00

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.

C#

[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)[^]

PInvokeStackImbalance was detected

2 solutions

Solution 1

Solution 2

Add your solution here

Preview 0

PInvokeStackImbalance was detected

2 solutions

Solution 1

Solution 2

Add your solution here

Preview 0

Existing Members

...or Join us