请问向一个进程外窗口发送WM_SHOWWINDOW消息为何无效?

[RockHwnd]

我得到一个窗口的句柄,然后向它发送WM_SHOWWINDOW,我想把他隐藏起来,但是却没有效果,请问可以这样做吗?
::SendMessage(hwnd,WM_SHOWWINDOW,FALSE,NULL);

请问如果不可以,那已知一个窗口的句柄要怎么做才能让他隐藏呢?

谢谢

[RockHwnd]

回Snow_Ice11111(雪上加冰):
我按你这样试过了,你也可以试试,无论是计算器,还是记事本,这样做都无效的,不知道为什么

[RockHwnd]

回ncucf(ncu晨风)
计算器程序应该不会不停的刷新的吧,我把它放在一边,但是还是没有效果,请麻烦各位帮忙看看了!!

[wuming2003]

The WM_SHOWWINDOW message is sent to a window when the window is about to be hidden or shown.

发WM_SHOWWINDOW应该是没用的，它只是窗口准备改变状态时，系统发出的消息，并不能控制窗口状态的改变。
正如ncucf(ncu晨风)说，使用showwindow(hwnd,SW_HIDE)应该是可以的。你会不会是获得的hwnd是错误的。

[RockHwnd]

问题解决了,正如无名所说的,谢谢了,结帖

[Snow_Ice11111]

HWND hwnd=::FindWindow(0,"ddd"); //隐藏"ddd"窗口
::PostMessage(hwnd,WM_SHOWWINDOW,FALSE,SW_OTHERZOOM);

[Snow_Ice11111]

wParam
Specifies whether a window is being shown. If wParam is TRUE, the window is being shown. If wParam is FALSE, the window is being hidden.
lParam
Specifies the status of the window being shown. If lParam is zero, the message was sent because of a call to the ShowWindow function; otherwise, lParam is one of the following values.
SW_OTHERUNZOOM
The window is being uncovered because a maximize window was restored or minimized.
SW_OTHERZOOM
The window is being covered by another window that has been maximized.
SW_PARENTCLOSING
The window's owner window is being minimized.
SW_PARENTOPENING
The window's owner window is being restored.

[ncucf]

呵呵，没有可靠的方法做到你要求的那一点，如果 远程进程在不停的刷新窗口，总是显示自己的话！

有一个方案：你用定时器不停的showwindow(hwnd,SW_HIDE)
还有一种方法，挂接远程进程的消息处理过程，过滤掉那些导致它不停的显示自己的消息！