C# API操作实例

/*c#在调用c++方法或者window api时不能象调用c#本身写的dll类库那样直接通过引用dll就可以调用相应的方法, 而是要把要引用的dll放到bin中,现通过[DllImport("User32.dll")]引用*/

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

using System.Runtime.InteropServices;

namespace API

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

    }

        [DllImport("User32.dll")]

        public static extern int MessageBoxA(int h, string m, string c, int type);

        [DllImport("User32.dll")]

        public static extern int MessageBox(int h, string m, string c, int type);

        [DllImport("User32.dll")]

        public static extern int GetDoubleClickTime();

        // public static extern int SendMessageA(int h, int m, int c, int type);

        private void button1_Click(object sender, EventArgs e)

        {

             MessageBoxA(0, "API Message Box", "API Demo", 0);

             MessageBox(0, "API Message Box", "API Demo", 0);

            MessageBox(0,GetDoubleClickTime().ToString(), "API Demo", 0);

            System.Windows.Forms.MessageBox.Show("111");

            // SendMessageA(0, 11, 22, 0);

        }

    }

}