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Add multi-instance detection to YAMDCC config editor
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If the config editor is already running, this will cause the existing instance to be focused. Note that this multi-instance detection system won't work with previous commits/versions of the YAMDCC config editor.
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@Sparronator9999
Sparronator9999 committed Jan 7, 2025
1 parent 40a3d74 commit 18c695a
Showing 1 changed file with 109 additions and 69 deletions.
178 changes: 109 additions & 69 deletions YAMDCC.ConfigEditor/Program.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -15,9 +15,12 @@
// YAMDCC. If not, see <https://www.gnu.org/licenses/>.

using System;
using System.Diagnostics;
using System.Globalization;
using System.IO;
using System.Runtime.InteropServices;
using System.ServiceProcess;
using System.Threading;
using System.Windows.Forms;
using YAMDCC.Common;
using YAMDCC.Common.Dialogs;
Expand All @@ -26,6 +29,8 @@ namespace YAMDCC.ConfigEditor
{
internal static class Program
{
private const int SW_RESTORE = 9;

/// <summary>
/// The main entry point for the application.
/// </summary>
Expand Down Expand Up @@ -55,101 +60,130 @@ private static void Main()
return;
}

// Make sure the application data directory structure is set up
// because apparently windows services don't know how to create
// directories:
Directory.CreateDirectory(Paths.Logs);

if (!Utils.ServiceExists("yamdccsvc"))
// multi-instance detection
// NOTE: GUID is used to prevent conflicts with potential
// identically named but different program
// based on: https://stackoverflow.com/a/184143
using (Mutex mutex = new(true, "{10572c4f-894e-4837-b31c-356d70c44e19}", out bool createdNew))
{
if (File.Exists("yamdccsvc.exe"))
// this instance is the first to open; proceed as normal:
if (createdNew)
{
if (MessageBox.Show(
Strings.GetString("dlgSvcNotInstalled"),
"Service not installed",
MessageBoxButtons.YesNo,
MessageBoxIcon.Information) == DialogResult.Yes)
// Make sure the application data directory structure is set up
// because apparently windows services don't know how to create
// directories:
Directory.CreateDirectory(Paths.Logs);

if (!Utils.ServiceExists("yamdccsvc"))
{
ProgressDialog dlg = new(Strings.GetString("dlgSvcInstalling"), (e) =>
if (File.Exists("yamdccsvc.exe"))
{
e.Result = false;
if (Utils.InstallService("yamdccsvc"))
if (MessageBox.Show(
Strings.GetString("dlgSvcNotInstalled"),
"Service not installed",
MessageBoxButtons.YesNo,
MessageBoxIcon.Information) == DialogResult.Yes)
{
if (Utils.StartService("yamdccsvc"))
ProgressDialog dlg = new(Strings.GetString("dlgSvcInstalling"), (e) =>
{
e.Result = true;
}
else
e.Result = false;
if (Utils.InstallService("yamdccsvc"))
{
if (Utils.StartService("yamdccsvc"))
{
e.Result = true;
}
else
{
Utils.ShowError(Strings.GetString("dlgSvcStartCrash"));
}
}
else
{
Utils.ShowError(Strings.GetString("dlgSvcInstallFail"));
}
});
dlg.ShowDialog();

if (dlg.Result is bool b && b)
{
Utils.ShowError(Strings.GetString("dlgSvcStartCrash"));
// Start the program when the service finishes starting:
Start();
}
}
else
{
Utils.ShowError(Strings.GetString("dlgSvcInstallFail"));
}
});
dlg.ShowDialog();

if (dlg.Result is bool b && b)
return;
}
else
{
// Start the program when the service finishes starting:
Start();
Utils.ShowError(Strings.GetString("dlgSvcNotFound"));
return;
}
}
return;
}
else
{
Utils.ShowError(Strings.GetString("dlgSvcNotFound"));
return;
}
}

// Check if the service is stopped:
ServiceController yamdccSvc = new("yamdccsvc");
try
{
ServiceControllerStatus status = yamdccSvc.Status;
if (status == ServiceControllerStatus.Stopped)
{
if (MessageBox.Show(
Strings.GetString("dlgSvcStopped"),
"Service not running", MessageBoxButtons.YesNo,
MessageBoxIcon.Information) == DialogResult.Yes)
// Check if the service is stopped:
ServiceController yamdccSvc = new("yamdccsvc");
try
{
ProgressDialog dlg = new(Strings.GetString("dlgSvcStarting"), (e) =>
ServiceControllerStatus status = yamdccSvc.Status;
if (status == ServiceControllerStatus.Stopped)
{
if (Utils.StartService("yamdccsvc"))
if (MessageBox.Show(
Strings.GetString("dlgSvcStopped"),
"Service not running", MessageBoxButtons.YesNo,
MessageBoxIcon.Information) == DialogResult.Yes)
{
e.Result = false;
ProgressDialog dlg = new(Strings.GetString("dlgSvcStarting"), (e) =>
{
if (Utils.StartService("yamdccsvc"))
{
e.Result = false;
}
else
{
Utils.ShowError(Strings.GetString("dlgSvcStartCrash"));
e.Result = true;
}
});
dlg.ShowDialog();

if (dlg.Result is bool b && b)
{
return;
}
}
else
{
Utils.ShowError(Strings.GetString("dlgSvcStartCrash"));
e.Result = true;
return;
}
});
dlg.ShowDialog();

if (dlg.Result is bool b && b)
{
return;
}
}
else
finally
{
return;
yamdccSvc?.Close();
}

// Start the program when the service finishes starting:
Start();
}
else
{
// YAMDCC is already running, focus
// (and restore, if minimised) its window:
Process current = Process.GetCurrentProcess();
foreach (Process process in Process.GetProcessesByName(current.ProcessName))
{
if (process.Id != current.Id)
{
if (process.MainWindowHandle != IntPtr.Zero)
{
ShowWindow(process.MainWindowHandle, SW_RESTORE);
SetForegroundWindow(process.MainWindowHandle);
}
break;
}
}
}
}
finally
{
yamdccSvc?.Close();
}

// Start the program when the service finishes starting:
Start();
}

private static void Start()
Expand Down Expand Up @@ -187,5 +221,11 @@ private static void Start()

Application.Run(new MainWindow());
}

[DllImport("user32.dll")]
private static extern bool SetForegroundWindow(IntPtr hWnd);

[DllImport("user32.dll")]
private static extern bool ShowWindow(IntPtr hWnd, int nCmdShow);
}
}

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