c# - 使用 C# 更改浏览器大小

Question

我可以从 C# 更改浏览器宽度吗？

我想做类似的事情：

var window = window.open("page.html");
window.resize(100,100);

但在 C# 中，是这样的：

Process p = Process.GetProcessesByName("page.html")[0];
p.resize(100,100);

可能吗？

Answer 1

一旦获得了应用程序（例如浏览器）的主窗口句柄，就可以使用 Windows APISetWindowPos()来更改其大小。

您可以从某个地方获取窗口句柄，Process.MainWindowHandle或者通过调用某些 Windows API 方法（例如FindWindow().

这是一个例子。要对其进行测试，请先打开Notepad而不打开文件，使其标题正好是"Untitled - Notepad". 这是必需的FindWindow()，因此示例代码中会找到它。

如果您运行代码，它应该移动并调整记事本窗口的大小。它可能会在 Visual Studio 后面结束，因为那将是活动窗口，因此您需要模仿 Visual Studio 以查看记事本的去向。

P/Invoke 声明是从PInvoke.Net获得的。

using System;
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using System.Runtime.InteropServices;
using System.Security;


namespace Demo
{
    class Program
    {
        [Flags]
        public enum SetWindowPosFlags: uint
        {
            // ReSharper disable InconsistentNaming

            /// <summary>
            ///     If the calling thread and the thread that owns the window are attached to different input queues, the system posts the request to the thread that owns the window. This prevents the calling thread from blocking its execution while other threads process the request.
            /// </summary>
            SWP_ASYNCWINDOWPOS = 0x4000,

            /// <summary>
            ///     Prevents generation of the WM_SYNCPAINT message.
            /// </summary>
            SWP_DEFERERASE = 0x2000,

            /// <summary>
            ///     Draws a frame (defined in the window's class description) around the window.
            /// </summary>
            SWP_DRAWFRAME = 0x0020,

            /// <summary>
            ///     Applies new frame styles set using the SetWindowLong function. Sends a WM_NCCALCSIZE message to the window, even if the window's size is not being changed. If this flag is not specified, WM_NCCALCSIZE is sent only when the window's size is being changed.
            /// </summary>
            SWP_FRAMECHANGED = 0x0020,

            /// <summary>
            ///     Hides the window.
            /// </summary>
            SWP_HIDEWINDOW = 0x0080,

            /// <summary>
            ///     Does not activate the window. If this flag is not set, the window is activated and moved to the top of either the topmost or non-topmost group (depending on the setting of the hWndInsertAfter parameter).
            /// </summary>
            SWP_NOACTIVATE = 0x0010,

            /// <summary>
            ///     Discards the entire contents of the client area. If this flag is not specified, the valid contents of the client area are saved and copied back into the client area after the window is sized or repositioned.
            /// </summary>
            SWP_NOCOPYBITS = 0x0100,

            /// <summary>
            ///     Retains the current position (ignores X and Y parameters).
            /// </summary>
            SWP_NOMOVE = 0x0002,

            /// <summary>
            ///     Does not change the owner window's position in the Z order.
            /// </summary>
            SWP_NOOWNERZORDER = 0x0200,

            /// <summary>
            ///     Does not redraw changes. If this flag is set, no repainting of any kind occurs. This applies to the client area, the nonclient area (including the title bar and scroll bars), and any part of the parent window uncovered as a result of the window being moved. When this flag is set, the application must explicitly invalidate or redraw any parts of the window and parent window that need redrawing.
            /// </summary>
            SWP_NOREDRAW = 0x0008,

            /// <summary>
            ///     Same as the SWP_NOOWNERZORDER flag.
            /// </summary>
            SWP_NOREPOSITION = 0x0200,

            /// <summary>
            ///     Prevents the window from receiving the WM_WINDOWPOSCHANGING message.
            /// </summary>
            SWP_NOSENDCHANGING = 0x0400,

            /// <summary>
            ///     Retains the current size (ignores the cx and cy parameters).
            /// </summary>
            SWP_NOSIZE = 0x0001,

            /// <summary>
            ///     Retains the current Z order (ignores the hWndInsertAfter parameter).
            /// </summary>
            SWP_NOZORDER = 0x0004,

            /// <summary>
            ///     Displays the window.
            /// </summary>
            SWP_SHOWWINDOW = 0x0040,

            // ReSharper restore InconsistentNaming
        }

        [DllImport("user32.dll")]
        [return: MarshalAs(UnmanagedType.Bool)]
        static extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int x, int y, int cx, int cy, SetWindowPosFlags uFlags);

        [SuppressMessage("Microsoft.Security", "CA2118:ReviewSuppressUnmanagedCodeSecurityUsage"), SuppressUnmanagedCodeSecurity]
        [DllImport("User32", CharSet=CharSet.Auto, SetLastError=true)]
        public static extern IntPtr FindWindow
        (
            [MarshalAs(UnmanagedType.LPTStr)] string lpClassName,  // class name
            [MarshalAs(UnmanagedType.LPTStr)] string lpWindowName  // window name
        );

        void run()
        {
            IntPtr notepadWindow = FindWindow(null, "Untitled - Notepad");

            if (notepadWindow != IntPtr.Zero)
                SetWindowPos(notepadWindow, IntPtr.Zero, 0, 0, 400, 400, SetWindowPosFlags.SWP_SHOWWINDOW);
        }

        static void Main()
        {
            new Program().run();
        }
    }
}