c# - 如何最小化/最大化打开的应用程序

Question

我有打开的应用程序列表。为了获得这个列表，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; }
    }
}

调用它我使用了下面的代码

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，我的任务是读取所选窗口的标题、获取进程句柄以及最大化/最小化或关闭窗口。我该怎么做。

Answer 1

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);

然后在你的代码中使用这个:

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

---

虽然看起来您已经通过使用 EnumWindows 获得了窗口句柄，但在这种情况下您只需要:

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

i 是窗口的索引。

---

关闭您将使用的窗口:

[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

---

或者你可以使用:

Process [] proc Process.GetProcessesByName("process name");
proc[0].Kill();

---

或者你可以使用:

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);