windows 使用 WM_SHOWWINDOW 代替 ShowWindow() 显示窗口
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Using WM_SHOWWINDOW to Show a Window instead of ShowWindow()
提问by Synetech
I'm trying to use the SendMessage function of a hotkey utility (or NirCMD, etc.) to get a hidden window to pop up. I can for example get windows to close by sending 0x0010 (WM_CLOSE), but when I try sending 0x0018 (WM_SHOWWINDOW) with a wParam of 1 and an lParam of 0, nothing happens.
我正在尝试使用热键实用程序（或 NirCMD 等）的 SendMessage 函数来弹出隐藏窗口。例如，我可以通过发送 0x0010 (WM_CLOSE) 来关闭窗口，但是当我尝试发送 wParam 为 1 且 lParam 为 0 的 0x0018 (WM_SHOWWINDOW) 时，没有任何反应。
I've looked around, and the few places where someone complained that WM_SHOWWINDOW did not work, they happily took the suggestion to use ShowWindow() instead.
我环顾四周，在有人抱怨 WM_SHOWWINDOW 不起作用的几个地方，他们很高兴地接受了改用 ShowWindow() 的建议。
However I don't have ShowWindow() available; I can only send Windows messages. But ShowWindow() is not magic, surely it works by SendMessage-ing a WM_SHOWWINDOW or something under the covers.
但是我没有 ShowWindow() 可用；我只能发送 Windows 消息。但是 ShowWindow() 不是魔术，它肯定是通过 SendMessage 来工作的，它是一个 WM_SHOWWINDOW 或隐藏的东西。
How can I get a window to display itself by sending it a message?
如何通过向窗口发送消息来让窗口自行显示？
Thanks.
谢谢。
回答by Anders
回答by Peter Ruderman
WM_SHOWWINDOW is a notification, not a command. From MSDN:
WM_SHOWWINDOW 是通知，而不是命令。来自 MSDN：
The WM_SHOWWINDOW message is sent to a window when the window is about to be hidden or shown.
当窗口即将被隐藏或显示时，WM_SHOWWINDOW 消息被发送到窗口。
I don't believe there is any message that you can use to make a window show itself. Actually, the very idea seems a little strange to me. The window manager is the system component responsible for showing and hiding windows. To show a window, you must use one of the window manager APIs.
我不相信有任何消息可以用来让窗口显示出来。实际上，这个想法对我来说似乎有点奇怪。窗口管理器是负责显示和隐藏窗口的系统组件。要显示窗口，您必须使用窗口管理器 API 之一。
回答by Bitterblue
I think there is no wayto achieve that with SendMessage(WM_SYSCOMMAND didn't work for me). I tried actually in C#. You click the button, the window will be minimized via ShowWindow()and then you can see what messages are sent:
我认为没有办法通过SendMessage（WM_SYSCOMMAND 对我不起作用）来实现这一点。我实际上在 C# 中尝试过。您单击按钮，窗口将通过以下方式最小化ShowWindow()，然后您可以看到发送了哪些消息：
using System;
using System.Runtime.InteropServices;
using System.Windows.Forms;
namespace WindowsFormsApplication1
{
public class Form1: Form
{
[DllImport("user32.dll", SetLastError = true)]
public static extern bool ShowWindow(IntPtr window, int showCommand);
private const int SW_MINIMIZE = 6;
private bool print = false;
public Form1()
{
Button button = new Button();
button.Click += onButtonsClick;
Controls.Add(button);
}
private void onButtonsClick(object sender, EventArgs e)
{
print = true;
ShowWindow(Handle, SW_MINIMIZE);
print = false;
}
protected override void WndProc(ref Message m)
{
if (print)
Console.WriteLine(m.Msg.ToString() + "\t0x" + m.Msg.ToString("x4") + "\t" + m.WParam + "\t" + m.LParam);
base.WndProc(ref m);
}
}
}
