Casio PA-2400W - Manual (Page 33)

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BOOL CallSip( HWND hWnd, WPARAM wId)
{
HWND hSip;
UINT CmdMessage = WM_USER;
hSip = FindWindow( ClassName_TSR, NULL); // Find "SipTsr"
if ( hSip == NULL) {
MessageBox( hWnd, TEXT("Error: FindWindow failed!"),
TEXT("SIPanel Sample"), MB_OK);
return FALSE;
}
switch( wId) {
case IDC_BTN_TEXT:
CmdMessage++;
case IDC_BTN_TEN:
CmdMessage++;
break;
default:
return FALSE;
}
SendMessage( hSip, CmdMessage, 0, 0); // Send message to SipTsr
return TRUE;
}