c# 两个exe如何传递参数?

启动a.exe时,给运行中的b.exe发一个消息,
具体怎么发消息到baidu上查一下就有了.

如果用a.exe去启动b.exe的话,可以使用
System.Diagnostics.Process.Start(b.exe","这里是要传过去的参数");

这个就要看楼主的具体需求了，我提供一个思路吧
1。如果是在a.exe中的某按钮点击时启动b.exe,则可以通过process进程类的argumens直接传递；2。若是两个exe都在运行过程中，则楼主所说的情况就是常见的两个进程之间互相通信的情况了。对于这个我常常是用windows api来实现，就是在a.exe中调用findWindow与sendMessage两个api函数来发送相应的消息，而b.exe重写窗口的消息处理方法来对消息进行判断处理

第一个项目包含一个Windows Form(Form1),在Form1上有一个Button和一个TextBox。    第二个项目包含一个Windows Form(Form1),在Form1上有两个Button，分别用来测试第一个应用程序中Button的Click事件和修改第一个应用程序中TextBox的值。    第一个应用程序中Form的代码如下:    using System;
    using System.Drawing;
    using System.Collections;
    using System.ComponentModel;
    using System.Windows.Forms;
    public class Form1 : System.Windows.Forms.Form {
    private System.Windows.Forms.Button button1;
    private System.Windows.Forms.TextBox textBox1;
    private System.ComponentModel.Container components = null;
    [STAThread]
    static void Main() {
    Application.Run(new Form1());
    }
    public Form1()    {
    InitializeComponent();
    }
    protected override void Dispose( bool disposing )    {
    if( disposing )    {
    if(components != null)    {
    components.Dispose();
    }
    }
    base.Dispose( disposing );
    }
    #region Windows 窗体设计器生成的代码
    private void InitializeComponent()    {
    this.button1 = new System.Windows.Forms.Button();
    this.textBox1 = new System.Windows.Forms.TextBox();
    this.SuspendLayout();
    //
    // button1
    //
    this.button1.Location = new System.Drawing.Point(32, 24);
    this.button1.Name = "button1";
    this.button1.TabIndex = 0;
    this.button1.Text = "button1";
    this.button1.Click += new System.EventHandler(this.button1_Click);
    //
    // textBox1
    //
    this.textBox1.Location = new System.Drawing.Point(32, 64);
    this.textBox1.Name = "textBox1";
    this.textBox1.TabIndex = 1;
    this.textBox1.Text = "textBox1";
    //
    // Form1
    //
    this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
    this.ClientSize = new System.Drawing.Size(292, 266);
    this.Controls.Add(this.textBox1);
    this.Controls.Add(this.button1);
    this.Name = "Form1";
    this.Text = "Form1";
    this.ResumeLayout(false);
    }
    #endregion
    private void button1_Click(object sender, System.EventArgs e) {
    MessageBox.Show("This is button1 click!");
    }
    }    第二个应用程序中Form的代码如下:    using System;
    using System.Text;
    using System.Drawing;
    using System.Collections;
    using System.ComponentModel;
    using System.Windows.Forms;
    using System.Runtime.InteropServices;
    public class TestForm1 : System.Windows.Forms.Form {
    private System.Windows.Forms.Button button1;
    private System.Windows.Forms.Button button2;
    private System.ComponentModel.Container components = null;
    [STAThread]
    static void Main() {
    Application.Run(new TestForm1());
    }
    public TestForm1()    {
    InitializeComponent();
    }
    protected override void Dispose( bool disposing )    {
    if( disposing )    {
    if(components != null)    {
    components.Dispose();
    }
    }
    base.Dispose( disposing );
    }
    #region Windows 窗体设计器生成的代码
    private void InitializeComponent()    {
    this.button1 = new System.Windows.Forms.Button();
    this.button2 = new System.Windows.Forms.Button();
    this.SuspendLayout();
    //
    // button1
    //
    this.button1.Location = new System.Drawing.Point(32, 24);
    this.button1.Name = "button1";
    this.button1.TabIndex = 0;
    this.button1.Text = "button1";
    this.button1.Click += new System.EventHandler(this.button1_Click);
    //
    // button2
    //
    this.button2.Location = new System.Drawing.Point(32, 64);
    this.button2.Name = "button2";
    this.button2.TabIndex = 0;
    this.button2.Text = "button2";
    this.button2.Click += new System.EventHandler(this.button2_Click);
    //
    // TestForm1
    //
    this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
    this.ClientSize = new System.Drawing.Size(292, 266);
    this.Controls.Add(this.button1);
    this.Controls.Add(this.button2);
    this.Name = "TestForm1";
    this.Text = "TestForm1";
    this.ResumeLayout(false);
    }
    #endregion
    private void button1_Click(object sender, System.EventArgs e) {
    IntPtr hwnd_win ;
    IntPtr hwnd_button ;
    hwnd_win = FindWindow("WindowsForms10.Window.8.app3","Form1");
    hwnd_button = FindWindowEx(hwnd_win ,new IntPtr(0) ,"WindowsForms10.BUTTON.app3","button1");
    const int BM_CLICK = 0x00F5;
    Message msg = Message.Create(hwnd_button ,BM_CLICK ,new IntPtr(0),new IntPtr(0));
    PostMessage(msg.HWnd ,msg.Msg ,msg.WParam ,msg.LParam);
    }
    private void button2_Click(object sender, System.EventArgs e) {
    const int WM_CHAR = 0x0102;
    IntPtr hwnd_win ;
    IntPtr hwnd_textbox ;
    hwnd_win = FindWindow("WindowsForms10.Window.8.app3","Form1");
    hwnd_textbox = FindWindowEx(hwnd_win ,new IntPtr(0) ,"WindowsForms10.EDIT.app3","textBox1");
    string strtext = "测试aaa";
    UnicodeEncoding encode = new UnicodeEncoding();
    char[] chars = encode.GetChars(encode.GetBytes(strtext));
    Message msg ;
    foreach (char c in chars ) {
    msg = Message.Create(hwnd_textbox ,WM_CHAR ,new IntPtr(c),new IntPtr(0));
    PostMessage(msg.HWnd ,msg.Msg ,msg.WParam ,msg.LParam);
    }
    }
    [DllImport("user32.dll")]
    public static extern IntPtr FindWindow(string lpClassName, string lpWindowName);
    [DllImport("user32.dll")]
    public static extern IntPtr FindWindowEx(IntPtr hwndParent,IntPtr hwndChildAfter,string lpszClass,string lpszWindow);
    [DllImport("user32.dll",CharSet=CharSet.Unicode)]
    public static extern IntPtr PostMessage(IntPtr hwnd,int wMsg,IntPtr wParam,IntPtr lParam);
    }    以上代码可以在VS.NET中编译运行，也可以使用csc.exe编译,如使用一下命令行：    F:>csc.exe Form1.cs    F:>csc.exe TestForm1.cs    编译后生成两个.exe文件。    首先运行第一个程序，显示Form1窗体，然后运行第二个程序，显示TestForm1窗体。    在TestForm1窗体上点击button1按钮（向Form1窗体上的button1发送消息）此时显示对话框提示“This is button1 click!”。    在TestForm1窗体上点击button2按钮（向Form1窗体上的textBox1发送消息）此时在Form1上的textBox1上显示“测试aaa”。

发送端public struct CopyDataStruct
        {
            public IntPtr dwData;
            public int cbData;            [MarshalAs(UnmanagedType.LPStr)]
            public string lpData;
        }          [DllImport("User32.dll")]
        public static extern int SendMessage(int hWnd, uint Msg, int wParam, ref CopyDataStruct lParam);        private const int WM_COPYDATA = 0x004A;        [DllImport("User32.dll")]
        private static extern int FindWindow(string lpClassName, string lpWindowName);         private void button1_Click(object sender, EventArgs e)
        {
            string strURL = "http://hi.csdn.net/zenghd";
            CopyDataStruct cds;
            cds.dwData = (IntPtr)1;
            cds.lpData = strURL;
            cds.cbData = System.Text.Encoding.Default.GetBytes(strURL).Length + 1;
            SendMessage(FindWindow(null,"B" ), WM_COPYDATA, 0, ref cds);   // 这里要修改成接收窗口的标题
        }接收端：
        public struct CopyDataStruct
        {
            public IntPtr dwData;
            public int cbData;            [MarshalAs(UnmanagedType.LPStr)]
            public string lpData;
        }          private const int WM_COPYDATA = 0x004A;
        protected override void WndProc(ref System.Windows.Forms.Message e)
        {
            if (e.Msg == WM_COPYDATA)
            {
                CopyDataStruct cds = (CopyDataStruct)e.GetLParam(typeof(CopyDataStruct));
                MessageBox.Show(cds.lpData);
            }            base.WndProc(ref e);
        }

首先,在发送方，用FindWindow找到接受方的句柄，然后向接受方发送WM_COPYDATA消息。
接受方在DefWndProc事件中处理这条消息。由于中文编码是两个字节, 所以传递中文时候字节长度要搞清楚。
protected override void DefWndProc(ref  System.Windows.Forms.Message m)
{
    switch (m.Msg)
    {
    case WinMessageUtil.WM_COPYDATA:
        string str = WinMessageUtil.ReceiveMessage(ref m);
        break;
    default:
        break;
    }
    base.DefWndProc(ref  m);
}using System;
using System.Runtime.InteropServices;
using System.Diagnostics;namespace Speeding.Util
{
    //WM_COPYDATA消息所要求的数据结构
    public struct CopyDataStruct
    {
        public IntPtr dwData;
        public int cbData;        [MarshalAs(UnmanagedType.LPStr)]
        public string lpData;
    }    /// <summary>
    /// 本类封装了一些进程间通讯的细节
    /// </summary>
    public class WinMessageUtil
    {
        public const int WM_COPYDATA = 0x004A;        //通过窗口的标题来查找窗口的句柄
        [DllImport("User32.dll", EntryPoint = "FindWindow")]
        private static extern int FindWindow(string lpClassName, string lpWindowName);        //在DLL库中的发送消息函数
        [DllImport("User32.dll", EntryPoint = "SendMessage")]
        private static extern int SendMessage
            (
            int hWnd,                        // 目标窗口的句柄
            int Msg,                        // 在这里是WM_COPYDATA
            int wParam,                    // 第一个消息参数
            ref  CopyDataStruct lParam        // 第二个消息参数
            );        /// <summary>
        /// 发送消息，只能传递一个自定义的消息ID和消息字符串，想传一个结构，但没成功
        /// </summary>
        /// <param name="destProcessName">目标进程名称，如果有多个，则给每个都发送</param>
        /// <param name="msgID">自定义数据，可以通过这个来决定如何解析下面的strMsg</param>
        /// <param name="strMsg">传递的消息，是一个字符串</param>
        public static void SendMessage(string destProcessName, int msgID, string strMsg)
        {
            if (strMsg == null)
                return;            //按进程名称查找，同名称的进程可能有许多，所以返回的是一个数组
            Process[] foundProcess = Process.GetProcessesByName(destProcessName);
            foreach (Process p in foundProcess)
            {
                int toWindowHandler = p.MainWindowHandle.ToInt32();
                if (toWindowHandler != 0)
                {
                    CopyDataStruct cds;
                    cds.dwData = (IntPtr) msgID;   //这里可以传入一些自定义的数据，但只能是4字节整数
                    cds.lpData = strMsg;            //消息字符串
                    cds.cbData = System.Text.Encoding.Default.GetBytes(strMsg).Length + 1;  //注意，这里的长度是按字节来算的                    //发送方的窗口的句柄, 由于本系统中的接收方不关心是该消息是从哪个窗口发出的，所以就直接填0了
                    int fromWindowHandler = 0;
                    SendMessage(toWindowHandler, WM_COPYDATA, fromWindowHandler, ref  cds);
                }
            }
        }        /// <summary>
        /// 接收消息，得到消息字符串
        /// </summary>
        /// <param name="m">System.Windows.Forms.Message m</param>
        /// <returns>接收到的消息字符串</returns>
        public static string ReceiveMessage(ref  System.Windows.Forms.Message m)
        {
            CopyDataStruct cds = (CopyDataStruct) m.GetLParam(typeof(CopyDataStruct));
            return cds.lpData;
        }
    }
}

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c# 两个exe如何传递参数?

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