如何检测非活动 Win32 应用程序中的最小化？

Question

My app should always minimize to the system tray, instead of to the task bar.

To do so, I handle WM_SYSCOMMAND / SC_MINIMIZE :

case WM_SYSCOMMAND:
    switch (wParam)
    {
        case SC_MINIMIZE:
            minimizeToTray();
            return FALSE;
        ...

This, however, does not cover events where the window gets minimized without a WM_SYSCOMMAND .

For example: I can minimize the window by using Win+D (show desktop).

To cover this case, I handle WM_ACTIVATE / WA_INACTIVE :

case WM_ACTIVATE:
{
    if (LOWORD(wParam) == WA_INACTIVE && HIWORD(wParam) != 0)
    {
        minimizeToTray();
    }
    ...

Which seems to only work if the window is active before showing the desktop.

---

Problems:

When the window is already inactive, no WM_ACTIVATE comes in to detect minimization. Which message tells me that the inactive window gets minimized?

EDIT: It seems that WM_WINDOWPOSCHANGED is the right place to check if the window is minimized, when it is not active.

Furthermore, when I activate some other app that is maximized, fully covering my own app, I also want to minimize to tray, but don't know if there's a message to handle in that case. The high word of the wParam for WM_ACTIVATE is 0 in that case (like it would also be if the window was just deactivated but still visible).

Answer 1

调用 IsIconic(hWnd) 以获取当前状态。