C / C++ / MFC

LRESULT SendMessage(
  HWND hWnd,      // handle to destination window
  UINT Msg,       // message
  WPARAM wParam,  // first message parameter
  LPARAM lParam   // second message parameter
);

void OnButtonREceivingMessage
{
FunctionCalledInButtonHandler;
}

void FunctionCalledInButtonHandler() each time the message is sent
{
 BOOL bContinue = TRUE;
 CWaitDialog dlg (&bContinue);
         globalCounter +=1;
         int nPercent = globalCounter something;//oops I dont know the total number of records the database will loop through, in the VC app. I know it in the VB dll. So if the VB dll somehow transferred that info to the VC client, then I could calculate the percentage..
        
         dlg.SetPercentComplete (nPercent);
         dlg.Pump ();
     }
 }

long CMHandle = (long)(((CMainFrame*)AfxGetMainWnd())->m_wndStatusBar.m_WzdProgressCtrl).GetSafeHwnd();

code>pView->SendMessage(WM_COMMAND,IDC_BUTTONHIDDEN1,0);</code>

BM_CLICK
An application sends a BM_CLICK message to simulate the user clicking a button. This message causes the button to receive the WM_LBUTTONDOWN and WM_LBUTTONUP messages, and the button's parent window to receive a BN_CLICKED notification message.

To send this message, call the SendMessage function with the following parameters. 

SendMessage(
  (HWND) hWnd,         // handle to destination window 
  BM_CLICK,            // message to send
  (WPARAM) wParam,     // not used; must be zero
  (LPARAM) lParam      // not used; must be zero
);

CWnd* pWnd = ...;  // get target window/dialog/view
pWnd->SendMessage (WM_COMMAND, IDC_BUTTONHIDDEN1);

Call SendMessage(hBtnHandle, BM_CLICK, byval 0&, byval 0&)

Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As Long

Call SendMessage(hViewHandle, WM_COMMAND, IDC_HIDDEN_BUTTON_1, 0);