Windows 10，DPI缩放和全屏 [英] Windows 10, DPI scaling and fullscreen

问题描述

我有一个应用程序，该应用程序是Windows 8.1的PROCESS_PER_MONITOR_DPI_AWARE和Windows 10 v1703的DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2。在窗口模式下，我的窗口具有WS_OVERLAPPEDWINDOW样式，在全屏模式下，我将其切换为监视器大小的WS_POPUP。

I have an application which is PROCESS_PER_MONITOR_DPI_AWARE from Windows 8.1 and DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2 from Windows 10 v1703. My windows have the WS_OVERLAPPEDWINDOW style when in windowed mode, and I switch them to a monitor-sized WS_POPUP when fullscreening.

当我在同一台显示器上更改DPI时，会出现窗口-mode窗口在Windows 8.1和Windows 10 v1703上的WM_DPICHANGED消息中获取正确缩放的窗口大小。但是，当全屏显示时，Windows 8.1不会调整全屏窗口的大小（保持相同的尺寸），而Windows 10 v1703会调整大小。这意味着25dpi的2560x1440全屏窗口在Windows 8.1上为144 dpi时仍为2560x1440，但在Windows 10 v1703上将其调整为3840x2160。

When I change DPI on the same monitor, a windowed-mode window get a correctly-scaled window size in the WM_DPICHANGED message on both Windows 8.1 and Windows 10 v1703. When fullscreened however, Windows 8.1 doesn't resize a fullscreen window (it keeps the same dimensions) but Windows 10 v1703 does. This means that a 2560x1440 fullscreen window at 96 dpi stays 2560x1440 on Windows 8.1 when going to, say, 144 dpi, but gets resized to 3840x2160 on Windows 10 v1703.

是这是正常情况，即保持全屏窗口大小与接收WM_GETDPISCALEDSIZE消息时应该手动执行的大小一样，该消息过去在Windows 8.1上是自动完成的？

Is this normal i.e. is keeping a fullscreen window the same size something I should now be manually doing when receiving the WM_GETDPISCALEDSIZE message, which just used to be done automatically on Windows 8.1?

编辑：经过进一步测试，仅当窗口为全屏时，WM_GETDPISCALEDSIZE消息似乎才被发送（WS_POPUP有效，但仅当其大小与监视器相同时才显示）。因此，我什至无法覆盖此行为，对于全屏显示窗口，Windows 8.1的工作方式与Windows 10 v1703不同。

After further testing, the WM_GETDPISCALEDSIZE message doesn't even seem to be sent if the window is fullscreen, only if it's windowed (WS_POPUP works but only if the size isn't the same as the monitor). Therefore I can't even override this behaviour, and Windows 8.1 works different to Windows 10 v1703 for fullscreened windows.

推荐答案

尝试一下：

void ShowFullScreen(HWND hwnd)
{
  LONG exStyle = ::GetWindowLong(hwnd, GWL_EXSTYLE);
  LONG style   = ::GetWindowLong(hwnd, GWL_STYLE);

  ::SetWindowLong(hwnd, GWL_STYLE,
                        (style & ~WS_OVERLAPPEDWINDOW) | WS_POPUPWINDOW);
  ::SetWindowLong(hwnd, GWL_EXSTYLE, exStyle | WS_EX_TOPMOST);
  ::ShowWindow(hwnd, SW_SHOWMAXIMIZED);
}

对解决W8.1的问题是否有帮助？

Will it help to solve the problem on W8.1?

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