c# 两个exe如何传递参数?

[wangxiao2008]

我有两个exe都在运行中,分别为a.exe和b.exe
当点击a.exe的一个按钮时,需要给b.exe传递一个参数
怎么传呢?穿过去b.exe中怎么接收呢?

[wangxiao2008]

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;
}
}
}

[qqlpp]

不如把a做成dll吧..

[sun_fz]

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.

[sun_fz]

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");

[ZengHD]

SendMessagae
WM_COPYDATA

[wangxiao2008]

[Quote=引用 4 楼 ZengHD 的回复:]
SendMessagae
WM_COPYDATA
[/Quote]
详细点儿...

[prince1985s]

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

[sun_fz]

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”。

[ZengHD]

        
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);
        } 

[lzqsmst]

mark

[ghl1984]

学习了

[elainte]

好东西！

[hwj3227]

好东西

[丁心驿]

不是很懂 顶一下！
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