使用C#在应用程序间发送消息
首先建立两个C#应用程序项目。
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:
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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:
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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：
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F:>csc.exe Form1.cs
F:>csc.exe TestForm1.cs
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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”。
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/12639172/viewspace-545025/ ，如需转载，请注明出处，否则将追究法律责任。
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