Form1.cs

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.Xml;
using System.IO;
using System.Collections;

namespace APITEST
{
    public partial class Form1 : Form
    {
        #region 变量
        public IntPtr ip;
        private int t;
        private string tmp;

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

        [StructLayout(LayoutKind.Sequential)]
        public struct PointAPI
        {
            public int x;
            public int y;
        }
        #endregion

        #region API
        [DllImport("user32", EntryPoint = "FindWindowA", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
        public static extern int FindWindow([MarshalAs(UnmanagedType.VBByRefStr)] ref string lpClassName, [MarshalAs(UnmanagedType.VBByRefStr)] ref string lpWindowName);

        [DllImport("user32.dll", SetLastError = true)]
        private static extern int GetForegroundWindow();

        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern bool GetWindowRect(int hwnd, ref Form1.RECT lpRect);

        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern int GetWindow(int hwnd, int cmd);

        [DllImport("user32.dll", EntryPoint = "GetCursorPos")]
        public static extern int GetCursorPos(ref Form1.PointAPI lpPoint);

        [DllImport("user32.dll", EntryPoint = "SetCursorPos")]
        private static extern int SetCursorPos(int x, int y);

        [DllImport("user32.dll", EntryPoint = "mouse_event", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
        public static extern bool apimouse_event(int dwFlags, int dX, int dY, int cButtons, int dwExtraInfo);