Wednesday, December 9, 2009

HOWTO: Close Application on Minimize

This is a popular question lately: how do I close my application when the user clicks the "smart minimize button"? This button does exactly that - it minimizes your application and does not close it. Your main application window is minimized when it receives a WM_SIZE message with the SIZE_MINIMIZED constant in the wParam parameter. All you have to do is call PostMessage(WM_CLOSE) and you are done. Here's a sample WTL handler:

LRESULT CCloseOnMinFrame::OnSize(UINT /*uMsg*/,WPARAM wParam, LPARAM /*lParam*/, BOOL& bHandled){
if(wParam == SIZE_MINIMIZED) {
bHandled = TRUE;
return 0;
// Not handled here
bHandled = FALSE;
return 1;

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