如何最小化/最大化打开的应用程序

本文关键字：应用程序 最大化 最小化 | 更新日期: 2023-09-27 18:30:27

我有打开的应用程序列表。为了获得此列表，我使用了以下代码

 internal static class NativeMethods
{
    public static readonly Int32 GWL_STYLE = -16;
    public static readonly UInt64 WS_VISIBLE = 0x10000000L;
    public static readonly UInt64 WS_BORDER = 0x00800000L;
    public static readonly UInt64 DESIRED_WS = WS_BORDER | WS_VISIBLE;
    public delegate Boolean EnumWindowsCallback(IntPtr hwnd, Int32 lParam);
    public static List<WindowWrapper> GetAllWindows()
    {
        List<WindowWrapper> windows = new List<WindowWrapper>();
        StringBuilder buffer = new StringBuilder(100);
        EnumWindows(delegate(IntPtr hwnd, Int32 lParam)
        {
            if ((GetWindowLongA(hwnd, GWL_STYLE) & DESIRED_WS) == DESIRED_WS)
            {
                GetWindowText(hwnd, buffer, buffer.Capacity);
                WindowWrapper wnd = new WindowWrapper();
                wnd.handle = hwnd;
                wnd.title = buffer.ToString();
                windows.Add(wnd);
            }
            return true;
        }, 0);
        return windows;
    }
    [DllImport("user32.dll")]
    static extern Int32 EnumWindows(EnumWindowsCallback lpEnumFunc, Int32 lParam);
    [DllImport("user32.dll")]
    public static extern void GetWindowText(IntPtr hWnd, StringBuilder lpString, Int32 nMaxCount);
    [DllImport("user32.dll")]
    static extern UInt64 GetWindowLongA(IntPtr hWnd, Int32 nIndex);
}
public class WindowWrapper : IWin32Window
{
    internal IntPtr handle;
    internal String title;
    public IntPtr Handle
    {
        get { return handle; }
    }
    public String Title
    {
        get { return title; }
    }
}

要调用它，我使用了以下代码

foreach (var wnd in NativeMethods.GetAllWindows())
       {
               string caption = wnd.title;
               string handle = wnd.Handle
               // Add this caption and handle to list
       }

现在，用户将从列表中选择任何打开的窗口，我的任务是阅读所选窗口的标题，获取进程的句柄并最大化/最小化或关闭窗口。我该怎么做。

如何最小化/最大化打开的应用程序

您可以使用

findwindowbycaption获取句柄，然后使用showwindow最大化或最小化 

private const int SW_MAXIMIZE = 3;
private const int SW_MINIMIZE = 6;
// more here: http://www.pinvoke.net/default.aspx/user32.showwindow
[DllImport("user32.dll", EntryPoint = "FindWindow")]
public static extern IntPtr FindWindowByCaption(IntPtr ZeroOnly, string lpWindowName);
[DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool ShowWindow(IntPtr hWnd, int nCmdShow);

然后在您的代码中使用以下：

IntPtr hwnd = FindWindowByCaption(IntPtr.Zero, "The window title");
ShowWindow(hwnd, SW_MAXIMIZE);
<小时 />

尽管在这种情况下，您似乎已经通过使用EnumWindows拥有窗口句柄，但您只需要：

ShowWindow(windows[i].handle, SW_MAXIMIZE);

i是窗口的索引。

<小时 />

要关闭窗口，您将使用：

[DllImport("user32.dll", CharSet = CharSet.Unicode, SetLastError=true)]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool DestroyWindow(IntPtr hwnd);

在代码中：

DestroyWindow(hwnd) //or DestroyWindow(windows[i].handle)

这是 system.windows.forms.form.close() 的非托管版本

<小时 />

或者您可以使用：

Process [] proc Process.GetProcessesByName("process name");
proc[0].Kill();
<小时 />

或者您可以使用：

static uint WM_CLOSE = 0x0010;
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("user32.dll", SetLastError = true)]
static extern bool PostMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);

在代码中：

PostMessage(hWnd, WM_CLOSE, IntPtr.Zero, IntPtr.Zero);

您可以将本机方法ShowWindow与SW_MAXIMIZE一起使用，SW_MINIMIZE用于ncmdShow看看 http://msdn.microsoft.com/en-us/library/windows/desktop/ms633548（v=vs.85）.aspx

private const int SW_MAXIMIZE = 3;
private const int SW_MINIMIZE = 6;
[DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool ShowWindow(IntPtr hWnd, ShowWindowCommands nCmdShow);

// in your code
ShowWindow(wnd.Handle, SW_MAXIMIZE);

您可以使用 ShowWindowAsync

private const int SW_SHOWNORMAL = 1;
private const int SW_SHOWMINIMIZED = 2;
private const int SW_SHOWMAXIMIZED = 3;
[DllImport("user32.dll")]
private static extern bool ShowWindowAsync(IntPtr hWnd, int nCmdShow);

ShowWindowAsync(wnd.Handle, SW_SHOWMINIMIZED );

而且更好并且使用

    var openWindows = Process.GetProcesses().Where(process=> String.IsNullOrEmpty(process.MainWindowTitle)==false);

打开窗口

我已经在Porcess中测试了MainWindowTitle，它有助于在给定标题的窗口中搜索。 

 var handles = Process.GetProcesses().Where(x => x.MainWindowTitle == "Untitled - Notepad").Select(y=>y.Handle).ToList();
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