WinFrom 只启动一个exe，并且获得焦点

只启动一个exe方法：

 1 using System;

 2 using System.Collections.Generic;

 3 using System.Runtime.InteropServices;

 4 using System.Windows.Forms;

 5 

 6 namespace StringToImage

 7 {

 8     static class Program

 9     {

10         [DllImport("user32.dll")]

11         public static extern IntPtr FindWindow(String classname, String title);

12         [DllImport("user32.dll")]

13         public static extern void SetForegroundWindow(IntPtr hwnd);

14 

15         [STAThread]

16         static void Main()

17         {

18             Application.EnableVisualStyles();

19             Application.SetCompatibleTextRenderingDefault(false);

20 

21             string p = System.Diagnostics.Process.GetCurrentProcess().ProcessName;

22             System.Diagnostics.Process[] processes = System.Diagnostics.Process.GetProcessesByName(p);

23             if (processes.Length < 2)

24                 Application.Run(new Form1());

25             else

26             {

27                 //MessageBox.Show("程序已经运行!", "系统提示", MessageBoxButtons.OK, MessageBoxIcon.Information);

28                 IntPtr ptr = FindWindow(null, "文字转换成图片");//"文字转换成图片"为对应窗体的Text值

29                 if (ptr.ToString() != "0")//不等于0表示找到了窗体

30                     SetForegroundWindow(ptr);

31 

32                 Application.Exit();

33             }

34         }

35     }

36 }

View Code