while (GetMessage(&msg, NULL, 0, 0))如何接收WM_QUIT

妳應該檢測WM_DESTROY或者WM_CLOSE，根據妳的需要應該是檢測WM_DESTROY

點小叉叉所引發的消息鏈是這樣的：

點叉叉，收到壹個WM_CLOSE消息，壹般這個消息自己不處理，所以送入DefWindowProc，默認的WM_CLOSE處理是送出壹個WM_DESTROY消息，然後妳收到，這個時候的壹般處理是PostQuitMessage，送出壹個WM_QUIT消息，GetMessage收到WM_QUIT就返回0，所以while就直接結束了，接下來的邏輯無法完成。

這是MSDN上對GetMessage返回值的解釋：

Return

Value

If

the

function

retrieves

a

message

other

than

WM_QUIT,

the

return

value

is

nonzero.

If

the

function

retrieves

the

WM_QUIT

message,

the

return

value

is

zero.

If

there

is

an

error,

the

return

value

is

-1.

For

example,

the

function

fails

if

hWnd

is

an

invalid

window

handle

or

lpMsg

is

an

invalid

pointer.

To

get

extended

error

information,

call

GetLastError.