回车触发button按钮，不是在同一个窗体，用C#可以实现吗？

Question

想要实现回车后触发button按钮click事件，不是在textbox中回车，是第一次点击button后窗体会最小化，同时实现click事件，现在想要在不再次打开窗体的情况下在当前页面回车之后会再次触发button事件

Answer 1

你的意思是button就是个开关，点一下开启截图功能，然后通过Enter键进行截图是吗？全局键盘钩子了解一下。

// 钩子调用代码

        private void button1_Click(object sender, EventArgs e)
        {
            // 设置钩子回调
            KeyPress_o.EnterDoEvent = CaptureScreen;
            // 开始全局键盘hook
            KeyPress_o.Hook_Start();
            this.WindowState = FormWindowState.Minimized;
        }

        protected override void OnFormClosed(FormClosedEventArgs e)
        {
            // 关闭全局键盘hook
            KeyPress_o.Hook_Clear();
            base.OnFormClosed(e);
        }

        // 截屏函数自己写
        void CaptureScreen() {
            MessageBox.Show("CaptureScreen");
        }

// 全局键盘钩子代码

using System;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.Diagnostics;

namespace WebClick_Tool
{
    public class KeyPress_o
    {
        [StructLayout(LayoutKind.Sequential)]
        public class KeyBoardHookStruct
        {
            public int vkCode;
            public int scanCode;
            public int flags;
            public int time;
            public int dwExtraInfo;
        }
        //委托 
        public delegate int HookProc(int nCode, int wParam, IntPtr lParam);
        static int hHook = 0;
        public const int WH_KEYBOARD_LL = 13;
        //LowLevel键盘截获，如果是WH_KEYBOARD＝2，并不能对系统键盘截取，Acrobat Reader会在你截取之前获得键盘。 
        static HookProc KeyBoardHookProcedure;

        public delegate void EnterDo();
        public static EnterDo EnterDoEvent;

        //设置钩子 
        [DllImport("user32.dll")]
        public static extern int SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId);
        [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
        //抽掉钩子 
        public static extern bool UnhookWindowsHookEx(int idHook);
        [DllImport("user32.dll")]
        //调用下一个钩子 
        public static extern int CallNextHookEx(int idHook, int nCode, int wParam, IntPtr lParam);
        [DllImport("kernel32.dll")]
        public static extern int GetCurrentThreadId();
        [DllImport("kernel32.dll")]
        public static extern IntPtr GetModuleHandle(string name);

        public static void Hook_Start()
        {
            if (hHook == 0)
            {
                KeyBoardHookProcedure = new HookProc(KeyBoardHookProc);
                hHook = SetWindowsHookEx(WH_KEYBOARD_LL, KeyBoardHookProcedure,
                        GetModuleHandle(Process.GetCurrentProcess().MainModule.ModuleName), 0);
                //如果设置钩子失败. 
                if (hHook == 0)
                {
                    Hook_Clear();
                }
            }
        }

        /// <summary>
        /// 取消钩子事件
        /// </summary>
        public static void Hook_Clear()
        {
            bool retKeyboard = true;
            if (hHook != 0)
            {
                retKeyboard = UnhookWindowsHookEx(hHook);
                hHook = 0;
            }
        }

        public static int KeyBoardHookProc(int nCode, int wParam, IntPtr lParam)
        {
            if (nCode >= 0)
            {
                KeyBoardHookStruct kbh = (KeyBoardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyBoardHookStruct));
                Keys k = (Keys)Enum.Parse(typeof(Keys), kbh.vkCode.ToString());
                switch (k)
                {
                    case Keys.Enter:
                        if (kbh.flags == 0)
                        {
                            if (EnterDoEvent != null) EnterDoEvent();
                        }
                        return 1;
                }
            }
            return CallNextHookEx(hHook, nCode, wParam, lParam);
        }
    }
}