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CWnd::SendMessage

Visual Studio 2010

Sends the specified message to this window.

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LRESULT SendMessage(
   UINT message,
   WPARAM wParam = 0,
   LPARAM lParam = 0 
);
message

Specifies the message to be sent.

wParam

Specifies additional message-dependent information.

lParam

Specifies additional message-dependent information.

The result of the message processing; its value depends on the message sent.

The SendMessage member function calls the window procedure directly and does not return until that window procedure has processed the message. This is in contrast to the PostMessage member function, which places the message into the window's message queue and returns immediately.

C++
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void CAboutDlg::OnPaint()
{
   // This code, normally emitted by the Application Wizard for a dialog-
   // based project for the dialog's WM_PAINT handler, runs only if the 
   // window is iconic. The window erases the icon's area, then
   // paints the icon referenced by m_hIcon.
   if (IsIconic())
   {
      CPaintDC dc(this); // device context for painting

      SendMessage(WM_ICONERASEBKGND, (WPARAM)dc.GetSafeHdc(), 0);

      // Center icon in client rectangle
      int cxIcon = GetSystemMetrics(SM_CXICON);
      int cyIcon = GetSystemMetrics(SM_CYICON);
      CRect rect;
      GetClientRect(&rect);
      int x = (rect.Width() - cxIcon + 1) / 2;
      int y = (rect.Height() - cyIcon + 1) / 2;

      // Draw the icon
      dc.DrawIcon(x, y, m_hIcon);
   }
   else
   {
      CDialog::OnPaint();   
   }
}

Header: afxwin.h

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