Refresh Window in Visual C++

Question

I've a Visual C++ project but I don't be able to refresh the window and redraw itself. I've used

RedrawWindow();
m_ProgressDlg->RedrawWindow();

and also

UpdateData(false);
m_ProgressDlg->UpdateData(false);

but never seems go well.

How can I do?

Answer 1

::InvalidateRect(hwnd, NULL, TRUE) WinAPI function (or wnd->InvalidateRect(NULL) method) should do the trick: it invalidates client area and causes the system to send WM_PAINT to the window to redraw it. If you want immediate redraw, you should also call UpdateWindow() just after invalidation.

Answer 2

Looks like you're using MFC.

I believe your app is busy and not processing messages from the queue, so it's not processing the WM_PAINT that would update the window.

Use the RDW_UPDATENOW parameter with RedrawWindow to force the repaint, even when your window is busy.

Answer 3

You could use UpdateWindow in conjunction with InvalidateRect to get an immediate redraw.

Answer 4

But in release version it doesn't function correctly also if with openeed worspace it seem to go

Answer 5

For client area use InvalidateRect + UpdateWindow. If you want to redraw the non-client area of the window, try calling SetWindowPos with SWP_DRAWFRAME | SWP_NOSIZE | SWP_NOMOVE | SWP_NOACTIVATE.