zoukankan      html  css  js  c++  java
  • C#进程间通信--API传递参数(SendMessage)

    注:本文为个人学习摘录,原文地址:http://blog.chinaunix.net/uid-26790551-id-3180355.html   
     
    我们不仅可以传递系统已经定义好的消息,还可以传递自定义的消息(只需要发送消息端和接收消息端对自定义的消息值统一即可)。下面的发送和接收端同时演示了系统消息和自定义的消息。消息统一采用4位16进制的数。
    1.系统消息使用的是0x0100(WM_KEYDOWN);0x0000--0x0400是系统自定义的消息,其中0x0000为WM_NULL,0x0400为WM_USER。0x0400以后的数值我们可以作为自定义的消息值。(见附录)
    2.自定义消息Message,代码如下:
     

    点击(此处)折叠或打开

    1. class Message
    2.     {
    3.         public const int USER = 0x0400;
    4.         public const int WM_TEST = USER + 101;
    5.         public const int WM_MSG = USER + 102;
    6.     }

    3.接收端和发送端
    接收端Form1:
     

    点击(此处)折叠或打开

    1. public partial class Form1 : Form
    2.     {
    3.         public Form1()
    4.         {
    5.             InitializeComponent();
    6.         }
    7.         [DllImport("User32.dll", EntryPoint = "SendMessage")]
    8.         private static extern int SendMessage(IntPtr hWnd, int msg, uint wParam, uint lParam);
    9.         //[DllImport("MessageDLL.dll", EntryPoint = "StartSendMessage")]//MessageDLL找不到
    10.         //private static extern int StartSendMessage(IntPtr hWnd);
    11.         //自己触发自定义消息
    12.         private void button1_Click(object sender, EventArgs e)
    13.         {
    14.             SendMessage(this.Handle, Message.WM_TEST, 100, 200);
    15.         }
    16.         private void button2_Click(object sender, EventArgs e)
    17.         {
    18.             //StartSendMessage(this.Handle);
    19.         }
    20.         //响应和处理自定义消息
    21.         protected override void DefWndProc(ref System.Windows.Forms.Message m)
    22.         {
    23.             string message;
    24.             switch (m.Msg)
    25.             {
    26.                 case Message.WM_TEST://处理消息
    27.                     message = string.Format("收到从应用程序发出的消息!参数为:{0}, {1}", m.WParam, m.LParam);
    28.                     MessageBox.Show(message);
    29.                     break;
    30.                 //case Message.WM_MSG:
    31.                 // message = string.Format("收到从DLL发出的消息!参数为:{0}, {1}", m.WParam, m.LParam);
    32.                 // MessageBox.Show(message);
    33.                 // break;
    34.                 default:
    35.                     base.DefWndProc(ref m);
    36.                     break;
    37.             }
    38.         }
    39.         private void Form1_KeyDown(object sender, KeyEventArgs e)
    40.         {
    41.             this.label1.Text = e.KeyValue.ToString();
    42.         }
    43.     }

    发送端Form2:button1启动接收端,button2关闭接收端,button3传递系统消息和自定义的消息。
     

    点击(此处)折叠或打开

    1. public partial class Form1 : Form
    2.     {
    3.         [DllImport("User32.dll", EntryPoint = "SendMessage")]
    4.         private static extern int SendMessage(IntPtr hWnd, int msg, int wParam, int lParam);
    5.         //[DllImport("MessageDLL.dll", EntryPoint = "StartSendMessage")]//MessageDLL找不到
    6.         //private static extern int StartSendMessage(IntPtr hWnd);
    7.         //internal string local = "this is a local internal";
    8.         public Form1()
    9.         {
    10.             InitializeComponent();
    11.         }
    12.         //ClassLibrary1.Class1 cla = new ClassLibrary1.Class1();
    13.         ProcessStartInfo startInfo = new ProcessStartInfo();
    14.         Process pro = new Process();
    15.         private void Form1_Load(object sender, EventArgs e)
    16.         {
    17.             startInfo.FileName = @"F:ProjectsWindowsFormsApplication1WindowsFormsApplication1inDebugWindowsFormsApplication1.exe";
    18.             pro.StartInfo = startInfo;
    19.         }
    20.         private void button1_Click(object sender, EventArgs e)
    21.         {
    22.             pro.Start();
    23.         }
    24.         private void button2_Click(object sender, EventArgs e)
    25.         {
    26.             pro.Kill();
    27.         }
    28.         private void button3_Click(object sender, EventArgs e)
    29.         {
    30.             IntPtr hWnd = pro.MainWindowHandle;
    31.             int data = Convert.ToInt32(this.textBox1.Text);
    32.             SendMessage(hWnd, 0x0100, data, 0);
    33.             SendMessage(hWnd, Message.WM_TEST, 300, 300);
    34. }

    4.界面显示:
    点击button1:
     
    左侧窗体为发送端,右侧窗体为接收端。
    左侧窗体在文本框中输入数值,然后点击button2后,左右窗体显示如下:
     
     
    4.关于消息驱动
    现在VS上已经由事件驱动取代了消息驱动,不过像消息驱动还是在进程间通信常用的。此外本来试着通过控制台应用程序向窗体发送消息,没有发送成功(如果有高人解决了,麻烦告诉me一下下哈)。不过一般消息发送与处理都是窗口之间进行的。
    5.附录:系统消息
     
    6.链接资料网站
  • 相关阅读:
    Render Props
    react16新特性
    typescript
    calc
    类数组
    promise fullfill状态时 value是一个promise,那么此promise.then()里面收到的是什么
    M个同样的苹果放N个同样的盘子,允许有盘子空着, 问有多少种放法?
    history
    js创建二维数组
    钉钉-E应用开发初体验(企业内部应用)
  • 原文地址:https://www.cnblogs.com/Herzog3/p/6370821.html
Copyright © 2011-2022 走看看