我有一个应用程序,在随后的一个检测是否有一个进程的同名已经运行,如果是,激活正在运行的应用程序的窗口,然后退出.
问题是主窗口可能被隐藏(只有一个通知区域图标可见),从而让我没有窗口句柄.
在启动时,上一个实例的MainWindowHandle属性为0,所以我不能发送ShowWindow或PostMessage.
有什么办法可以发送可以被运行的应用程序拦截的消息,从而允许它显示其主窗口？
该应用程序是用C#编写的,我正在使用的代码来实现这一点.
[STAThread]
static void Main()
{
bool createdNew = true;
using (Mutex mutex = new Mutex(true,"MyMutexName",out createdNew))
{
if (createdNew)
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new MainForm());
}
else
{
Process current = Process.GetCurrentProcess();
foreach (Process process in Process.GetProcessesByName(current.ProcessName))
{
if (process.Id != current.Id)
{
Interop.WINDOWINFO pwi = new Interop.WINDOWINFO();
IntPtr handle = process.MainWindowHandle;
var isVisible = Interop.GetWindowInfo(handle,ref pwi);
if (!isVisible)
{
MessageBox.Show(Constants.APP_NAME + " is already running,check the notification area (near the clock).",Constants.APP_NAME,MessageBoxButtons.OK,MessageBoxIcon.Information);//temporary message,until I find the solution
//Interop.ShowWindow(handle,Interop.WindowShowStyle.ShowNormal);
//Interop.PostMessage(handle,Interop.WM_CUSTOM_ACTIVATEAPP,IntPtr.Zero,IntPtr.Zero);
}
else
Interop.SetForegroundWindow(handle);//this works when the window is visible
break;
}
}
}
}
}
}
解决方法
这是我如何做到这一点：
using System;
using System.Runtime.InteropServices;
using System.Threading;
using System.Windows.Forms;
public partial class MainForm : Form
{
#region Dll Imports
private const int HWND_BROADCAST = 0xFFFF;
private static readonly int WM_MY_MSG = RegisterWindowMessage( "WM_MY_MSG" );
[DllImport( "user32" )]
private static extern bool PostMessage(IntPtr hwnd,int msg,IntPtr wparam,IntPtr lparam);
[DllImport( "user32" )]
private static extern int RegisterWindowMessage(string message);
#endregion Dll Imports
static Mutex _single = new Mutex(true,"{4EABFF23-A35E-F0AB-3189-C81203BCAFF1}");
[STAThread]
static void Main()
{
// See if an instance is already running...
if (_single.WaitOne(TimeSpan.Zero,true)) {
// No...start up normally.
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
try {
Application.Run(new MainForm());
} catch (Exception ex) {
// handle exception accordingly
} finally {
_single.ReleaseMutex();
}
} else {
// Yes...Bring existing instance to top and activate it.
PostMessage(
(IntPtr) HWND_BROADCAST,WM_MY_MSG,new IntPtr(0xCDCD),new IntPtr(0xEFEF));
}
}
protected override void WndProc(ref Message m)
{
if (m.Msg == WM_MY_MSG) {
if ((m.WParam.ToInt32() == 0xCDCD) && (m.LParam.ToInt32() == 0xEFEF)) {
if (WindowState == FormWindowState.Minimized) {
WindowState = FormWindowState.Normal;
}
// Bring window to front.
bool temp = TopMost;
TopMost = true;
TopMost = temp;
// Set focus to the window.
Activate();
}
} else {
base.WndProc(ref m);
}
}
}
我希望我已经正确地转录了.我不得不放弃很多其他的东西,但我认为我有必要的.我为我工作,没有失败.如果你有问题,让我知道,我会看看我错过了什么.