Winform调用系统计算器、记事本

    

______________________________________________C#调用系统计算器____________________________________________

  

          ProcessStartInfo Info = new ProcessStartInfo();
            Info.FileName = "calc.exe ";//"calc.exe"为计算器，"notepad.exe"为记事本
            Process Proc = Process.Start(Info);

 

______________________________________________C#调用系统计算器，并获得值____________________________________

 

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.Diagnostics;
using System.Runtime.InteropServices;

namespace CSharpWin04
{
    public partial class Form3 : Form
    {
        public Form3()
        {
            InitializeComponent();
        }

        Process pcalc = null;
        //启动计算器
        private void button1_Click(object sender, EventArgs e)
        {
            pcalc = Process.Start("calc.exe");
        }

        //获取文本框的结果
        [DllImport("user32.dll", EntryPoint = "FindWindow")]
        public static extern IntPtr FindWindow(string lpClassName, stringlpWindowName);
        [DllImport("user32.dll", EntryPoint = "FindWindowEx")]
        public static extern IntPtr FindWindowEx(IntPtr hWnd1, IntPtr hWnd2, stringlpsz1, string lpsz2);
        [DllImport("User32 ")]
        public static extern bool SendMessage(IntPtr hWnd, int Msg, int wParam, IntPtr lParam);
        public const int WM_GETTEXT = 0xD;
        private void button2_Click(object sender, EventArgs e)
        {
            if (pcalc == null || pcalc.HasExited) return;
            IntPtr hEdit = FindWindowEx(pcalc.MainWindowHandle, IntPtr.Zero,"Edit", null);
            string w = " ";
            IntPtr ptr = Marshal.StringToHGlobalAnsi(w);
            if (SendMessage(hEdit, WM_GETTEXT, 100, ptr))
            {
                MessageBox.Show(Marshal.PtrToStringAnsi(ptr));
            }
        }
    }
}