CWnd::SendMessage
Visual Studio 2005
Sends the specified message to this window.
LRESULT SendMessage( UINT message, WPARAM wParam = 0, LPARAM lParam = 0 );
Parameters
- message
-
Specifies the message to be sent.
- wParam
-
Specifies additional message-dependent information.
- lParam
-
Specifies additional message-dependent information.
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.
// In a dialog-based app, if you add a minimize button to your
// dialog, you will need the code below to draw the icon.
void CMyDlg::OnPaint()
{
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 represented by handle m_hIcon
dc.DrawIcon(x, y, m_hIcon);
}
else
{
CDialog::OnPaint();
}
}
