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。
资料来源
https://www.codeproject.com/Articles/2976/Detect-if-another-process-is-running-and-bring-it
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Alfred V. Aho、Jeffrey D. Ullman、John E. Hopcroft / Addison Wesley / 1983-1-11 / USD 74.20
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