Databases
StackOverflow2013
Postsdbo
POSend message to a Windows process (not its main window)
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POSend message to a Windows process (not its main window)
    primarykey
    data
    text
    <p>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.</p> <p>The problem is that the main window could be hidden (only a notification area icon visible), thus leaving me with no window handle.</p> <p>At startup, previous instance's <code>MainWindowHandle</code> property is 0, so I can't send <code>ShowWindow</code> or <code>PostMessage</code>.</p> <p>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?</p> <p>The application is written in C#, the code I'm using to achieve this below.</p> <pre><code>[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; } } } } } } </code></pre>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USchitza
    1. USchitza
    plurals
    1. This table or related slice is empty.
    1. PL
      singulars
      1. LTLinked
    2. PL
      singulars
      1. LTLinked
    3. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POSend message to a Windows process (not its main window)
      1. USRobert Harvey
      1. VTFavorite
    2. VO
      singulars
      1. POSend message to a Windows process (not its main window)
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. POSend message to a Windows process (not its main window)
      1. This table or related slice is empty.
      1. VTUpMod
    1. This table or related slice is empty.
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload