Question

我试图让form2相对于form1定位。我尝试过很多东西似乎没什么用。我想尝试一下：

http://www.pinvoke.net/default.aspx/user32/MoveWindow.html

作为Windows编程的新手，特别是C＃我正在查看语法/示例，我发现很难知道要为参数添加什么。我确实得到了一个更简单的p / invoke来工作：

using System.Runtime.InteropServices;
 ...
        public partial class Form1 : Form
        {
            public Form1()
            {    InitializeComponent();  }

            [DllImport("kernel32.dll")]
            [return: MarshalAs(UnmanagedType.Bool)]
            static extern bool CreateDirectory(string lpPathName,
               IntPtr lpSecurityAttributes);

            private void Form1_Load(object sender, EventArgs e)   { }

            private void button1_Click(object sender, EventArgs e)
            {   CreateDirectory(@"c:\test4", IntPtr.Zero);  }
        }
    ...

我正在猜测IntPtr是＆＃34;说＆＃34;我指着第一个节点 - 但只是一个猜测......

MoveWindow的C＃签名：

   [DllImport("user32.dll", SetLastError = true)]
    internal static extern bool MoveWindow(IntPtr hWnd, int X, int Y, int nWidth, int nHeight, bool bRepaint);

在网站上也有这方面的评论。＆＃34; IntPtr hWnd＆＃34; - 我需要将其与Form2（？）相关联，重新绘制吗？我试图表明我已经看过它并试图解决它 - 我知道我们是从系统中得到它的......我得到的xy但是得到了它＆＃34;与＆＃34; Form2我输了。帮助赞赏。

Answer 1

一般来说，你不需要像这样简单的PInvoke。

只要您从form1引用form2，就可以通过监听form1的LocationChanged事件轻松完成此操作。当form1移动时，您可以通过执行以下操作来移动form2：

var location = this.Location;
location.Offset(xoffset, yoffset);
form2.Location = location;

这通常足以确保将form2放在相对于form1的某个位置，并在移动form1时更新其位置。如果在首次创建表单时未调用LocationChanged事件，则可能必须设置form2的初始位置。

Answer 2

这样的事情应该有效。测试过了。你可以改变它以完全符合你想要做的事情，这根本不应该是一个问题。

    // Win32 RECT
    [StructLayout(LayoutKind.Sequential)]
    public struct RECT
    {
        public int Left;
        public int Top;
        public int Right;
        public int Bottom;
    }

    // GetWindowRect gets the win32 RECT by a window handle.
    [DllImport("user32.dll", SetLastError=true)]
    static extern bool GetWindowRect(IntPtr hwnd, out RECT lpRect);

    // MoveWindow moves a window or changes its size based on a window handle.
    [DllImport("user32.dll", SetLastError = true)]
    static extern bool MoveWindow(IntPtr hWnd, int X, int Y, int nWidth, int nHeight, bool bRepaint);

    // MoveForms moves one form to another using the win api.
    void MoveForms(Form fromForm, Form toForm)
    {
        IntPtr hWnd_from = fromForm.Handle; // fromForm window handle
        IntPtr hWnd_to = toForm.Handle; // toForm window handle

        RECT rect_from, rect_to; // RECT holders for fromForm and toForm
        if (GetWindowRect(hWnd_from, out rect_from) &&
            GetWindowRect(hWnd_to, out rect_to)) // if it gets the win32 RECT for both the fromForm and toForm do the following ...
        {
            int x_to = rect_to.Left; // toForm's X position
            int y_to = rect_to.Top; // toForm's Y position

            int width_from = rect_from.Right - rect_from.Left; // fromForm's width
            int height_from = rect_from.Bottom - rect_from.Top; // fromForm's height

            // Moves fromForm to toForm using the x_to, y_to for X/Y and width_from, height_from for W/H.
            MoveWindow(hWnd_from, x_to, y_to, width_from, height_from, true);
        }
    }

Pinvoke MoveWindow在C＃中

2 个答案: