[Winform]检测exe是否已经运行，并将其置顶

栏目: ASP.NET · 发布时间: 7年前

内容简介：[Winform]检测exe是否已经运行，并将其置顶

摘要

在很多pc应用中，基本上都需要有这样的判断，保证在一个终端只运行一个winform的client。并且如果最小化了，用户再次双击桌面图标的时候，将client置顶显示。

解决方案

需要使用windows的API，可以很方便的实现这个目的。

代码如下：

using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
class AppMain
{
    [DllImport("user32.dll")] private static extern 
        bool SetForegroundWindow(IntPtr hWnd);
    [DllImport("user32.dll")] private static extern 
        bool ShowWindowAsync(IntPtr hWnd, int nCmdShow);
    [DllImport("user32.dll")] private static extern 
        bool IsIconic(IntPtr hWnd);

    private const int SW_HIDE = 0;
    private const int SW_SHOWNORMAL = 1;
    private const int SW_SHOWMINIMIZED = 2;
    private const int SW_SHOWMAXIMIZED = 3;
    private const int SW_SHOWNOACTIVATE = 4;
    private const int SW_RESTORE = 9;
    private const int SW_SHOWDEFAULT = 10;

    static void Main()
    {
        // get the name of our process
        string proc=Process.GetCurrentProcess().ProcessName;
        // get the list of all processes by that name
        Process[] processes=Process.GetProcessesByName(proc);
        // if there is more than one process...
        if (processes.Length > 1)
        {
            // Assume there is our process, which we will terminate, 
            // and the other process, which we want to bring to the 
            // foreground. This assumes there are only two processes 
            // in the processes array, and we need to find out which 
            // one is NOT us.

            // get our process
            Process p=Process.GetCurrentProcess();
            int n=0;        // assume the other process is at index 0
            // if this process id is OUR process ID...
            if (processes[0].Id==p.Id)
            {
                // then the other process is at index 1
                n=1;
            }
            // get the window handle
            IntPtr hWnd=processes[n].MainWindowHandle;
            // if iconic, we need to restore the window
            if (IsIconic(hWnd))
            {
                ShowWindowAsync(hWnd, SW_RESTORE);
            }
            // bring it to the foreground
            SetForegroundWindow(hWnd);
            // exit our process
            return;
        }
        // ... continue with your application initialization here.
    }
}

上面代码的意思是判断exe是否已经在进程列表中，如果存在则标识已经运行了客户端，如果存在获取窗口的句柄，并进行展示。