::SendMessage(hwnd, WM_SYSCOMMAND, 0xf008, MAKELONG(p.x, p.y));
::SetWindowPos(hdlg, NULL, p.x, p.y, 0, 0, SWP_NOSIZE | SWP_NOZORDER | SWP_NOACTIVATE);
::DestroyWindow(hwnd);

FN(WORD, capCreateCaptureWindowA, (String WindowName, int32 Style,int32 x, int32 y, int32 Width, int32 Height, int32 hParent, int32 ID));

/*
 * '--The capCreateCaptureWindow function creates a capture window--
 * Declare Function capCreateCaptureWindowA Lib "avicap32.dll" _
 *    (ByVal lpszWindowName As String, ByVal dwStyle As Integer, _
 *     ByVal x As Integer, ByVal y As Integer, ByVal nWidth As Integer, _
 *     ByVal nHeight As Short, ByVal hWnd As Integer, _
 *     ByVal nID As Integer) As Integer
 * 

c:/..../avicap32.dli:1:10: error: expected ')' before 'capCreateCaptureWindowA_type'
 FN(WORD, capCreateCaptureWindowA, (char *WindowName, long Style,long x, long y, long Width, long Height, long hParent, long ID));
          ^
C:\upp\uppsrc/Core/dli.h:42:23: note: in definition of macro 'FN_CN'
  typedef retval (call fn##_type) args; fn##_type *fn;

#define DLLFILENAME "avicap32.dll"
#define DLIMODULE   avicap32
#define DLIHEADER   <LM/avicap32.dli>
#define DLLCALL     LNPUBLIC
#include <Core/dli.h>

void	MyAppWindow::CapStart(void)
{
	HWND hwnd;

	hwnd = avicap32().capCreateCaptureWindowA("WebCam", WS_VISIBLE | WS_CHILD,0,0,640,480,picCapture.GetHWND(), 0);
}

In DLI file
FN_C(HWND, WINAPI, capCreateCaptureWindowA, 
	(const char *WindowName, UINT Style,UINT x, UINT y, UINT Width, UINT Height, HANDLE hParent, UINT ID))