问题描述
我有在随后开始检测是否有具有相同名称已经在运行,如果是这样处理的应用,激活运行的应用程序的窗口,然后退出。
的问题是,在主窗口可以被隐藏(只有一个通知区域图标可见),从而留下我没有窗口句柄。
在启动时,previous实例的 MainWindowHandle
属性为0,所以我不能发送的ShowWindow
或 PostMessage的
。
有没有什么办法可以发送可通过运行应用程序截获的消息,从而使其能够显示其主窗口?
该应用程序是用C#中,code我使用的是实现这一目标如下:
[STAThread]
静态无效的主要()
{
布尔createdNew = TRUE;
使用(互斥互斥=新的mutex(真的,MyMutexName,出createdNew))
{
如果(createdNew)
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(假);
Application.Run(新的MainForm());
}
其他
{
过程电流= Process.GetCurrentProcess();
的foreach(工艺过程Process.GetProcessesByName(current.ProcessName))
{
如果(process.Id!= current.Id)
{
Interop.WINDOWINFO PWI =新Interop.WINDOWINFO();
IntPtr的处理= process.MainWindowHandle;
VAR ISVISIBLE = Interop.GetWindowInfo(手柄,参考PWI);
如果(!ISVISIBLE)
{
的MessageBox.show(Constants.APP_NAME +已经在运行,检查通知区域(时钟附近)。
Constants.APP_NAME,MessageBoxButtons.OK,MessageBoxIcon.Information); //临时的消息,直到我找到解决方案
//Interop.ShowWindow(handle,Interop.WindowShowStyle.ShowNormal);
//Interop.PostMessage(handle,Interop.WM_CUSTOM_ACTIVATEAPP,IntPtr.Zero,IntPtr.Zero);
}
其他
Interop.SetForegroundWindow(手柄); //这个作品时,窗口可见
打破;
}
}
}
}
}
}
以下是我已经做到了这一点:
使用系统;
使用了System.Runtime.InteropServices;
使用的System.Threading;
使用System.Windows.Forms的;
公共部分类的MainForm:表
{
#区域导入DLL
私人const int的HWND_BROADCAST = 0xFFFF的;
私人静态只读INT WM_MY_MSG = RegisterWindowMessage(WM_MY_MSG);
[的DllImport(USER32)]
私有静态的extern BOOL PostMessage的(IntPtr的HWND,INT味精,IntPtr的WPARAM,IntPtr的LPARAM);
[的DllImport(USER32)]
私人静态外部INT RegisterWindowMessage(字符串消息);
#endregion导入DLL
静态互斥_single =新的互斥(真的,{4EABFF23-A35E-F0AB-3189-C81203BCAFF1});
[STAThread]
静态无效的主要()
{
//查看是否有实例已在运行...
如果(_single.WaitOne(TimeSpan.Zero,真)){
//不......正常启动。
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(假);
尝试 {
Application.Run(新的MainForm());
}赶上(例外前){
//处理异常相应
} 最后 {
_single.ReleaseMutex();
}
} 其他 {
//是......把现有的实例顶部并激活它。
PostMessage的(
(IntPtr的)HWND_BROADCAST,
WM_MY_MSG,
新的IntPtr(0xCDCD)
新的IntPtr(0xEFEF));
}
}
保护覆盖无效的WndProc(参考消息M)
{
如果(m.Msg == WM_MY_MSG){
如果((m.WParam.ToInt32()== 0xCDCD)及及(m.LParam.ToInt32()== 0xEFEF)){
如果(的WindowState == FormWindowState.Minimized){
的WindowState = FormWindowState.Normal;
}
//把窗口前面。
布尔TEMP =最顶层;
最顶层=真;
最顶层=温度;
//将焦点设置窗口。
激活();
}
} 其他 {
base.WndProc(REF米);
}
}
}
我希望我已经正确的转录本。我不得不离开了很多其他的东西,但我想我得到了什么是必要的。我有什么对我的作品没有失败。如果你有问题,让我知道,我会看看有什么我已经错过了。
I have an application that on a subsequent start detects if there's a process with the same name already running and, if so, activates the running app's window and then exits.
The problem is that the main window could be hidden (only a notification area icon visible), thus leaving me with no window handle.
At startup, previous instance's MainWindowHandle
property is 0, so I can't send ShowWindow
or PostMessage
.
Is there any way I can send a message that can be intercepted by the running app, thus allowing it to display its main window?
The application is written in C#, the code I'm using to achieve this below.
[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;
}
}
}
}
}
}
Here's how I've done this:
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);
}
}
}
I hope I've transcribed this correctly. I had to leave out a lot of other stuff, but I think I got what is necessary. What I have works for me without fail. If you have a problem, let me know, and I'll see what I've missed.
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