C#通过热键控制显示器开关的方法

本文实例讲述了c#通过热键控制显示器开关的方法。分享给大家供大家参考。

具体实现方法如下：

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;

namespace openmonitor
{
    public partial class form1 : form
    {
        public form1()
        {
            initializecomponent();
            hotkey.registerhotkey(this.handle, 100, 0, keys.f4);
            hotkey.registerhotkey(this.handle,101,0,keys.f5);
        }

        class hotkey
        {
            // 如果函数执行成功，返回值不为0。
            // 如果函数执行失败，返回值为0。要得到扩展错误信息，调用getlasterror。
            [dllimport("user32.dll  ", setlasterror = true)]
            public static extern bool registerhotkey(
                   intptr hwnd, // 要定义热键的窗口的句柄
                    int id,    // 定义热键id（不能与其它id重复）  
                   keymodifiers fsmodifiers, // 标识热键是否在按alt、ctrl、shift、windows等键时才会生效
                   keys vk    // 定义热键的内容
                   );

            [dllimport("user32.dll  ", setlasterror = true)]
            public static extern bool unregisterhotkey(
                   intptr hwnd,  // 要取消热键的窗口的句柄
                    int id      // 要取消热键的id
                   );

            // 定义了辅助键的名称（将数字转变为字符以便于记忆，也可去除此枚举而直接使用数值）
            [flags()]
            public enum keymodifiers
            {
                none = 0,
                alt = 1,
                ctrl = 2,
                shift = 4,
                windowskey = 8
            }
        }

        protected override void wndproc(ref    message m)
        {
            const int wm_hotkey = 0x0312;
            // 按快捷键  
            switch (m.msg)
            {
                case wm_hotkey:
                    switch (m.wparam.toint32())
                    {
                        case 100:
                            monitorhelper.turnon();
                            break;
                        case 101:
                            monitorhelper.turnoff();
                            break;
                    }
                    break;
            }
            base.wndproc(ref    m);
        }

        class monitorhelper
        {
            public static void turnon()
            {
                sendmessage(hwnd_broadcast, wm_syscommand, sc_monitorpower, -1);
            }

            public static void turnoff()
            {
                sendmessage(hwnd_broadcast, wm_syscommand, sc_monitorpower, 2);
            }

            [dllimport("user32.dll")]
            public static extern int sendmessage(intptr hwnd, uint msg, int wparam, int lparam);

            private static readonly intptr hwnd_broadcast = new intptr(0xffff);
            private const uint wm_syscommand = 0x0112;
            private const int sc_monitorpower = 0xf170;
        }
    }
}

希望本文所述对大家的c#程序设计有所帮助。