public frame_home(string filename)
{
InitializeComponent();
InitialiseShadow();
access_home = this;
if (filename != null)
{
newTab(filename, -1);
}
else
{
newTab(null, -1);
}
}
static private void EnableResize(frame_home frame)
{
frame.SetStyle(ControlStyles.ResizeRedraw, true);
}
/// args - Filepath of garbage file, name of tab, if tab is saved - location of saved file
static void Main(string[] args)
{
guid = "034c3adc-0056-4167-97e0-772f92d572fa";
bool createdNew = true;
if (args.Length == 4)
{
guid = Guid.NewGuid().ToString();
}
//by creating a mutex, the next application instance will detect it
//and the code will flow through the "else" branch
using (Mutex mutex = new Mutex(true, guid, out createdNew))//make sure it's an unique identifier (a GUID would be better)
{
if (createdNew)
{
string filename;
if (args != null && args.Length > 0)
{
filename = args[0];
}
else
{
filename = null;
}
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
frame_home frame = new frame_home(filename);
// check for modifications
if (args.Length == 4)
{
string location = args[2];
if (location == "null")
{
location = null;
}
frame.newWindowChange(args[1], location, Convert.ToBoolean(Int32.Parse(args[3])));
}
guid = Process.GetCurrentProcess().Id.ToString();
Debug.WriteLine("original-" + guid);
Application.Run(frame);
}
else
{
//we tried to create a mutex, but there's already one (createdNew = false - another app created it before)
//so there's another instance of this application running
Process currentProcess = Process.GetCurrentProcess();
//get the process that has the same name as the current one but a different ID
foreach (Process process in Process.GetProcessesByName(currentProcess.ProcessName))
{
if (process.Id != currentProcess.Id)
{
IntPtr handle = process.MainWindowHandle;
//if the handle is non-zero then the main window is visible (but maybe somewhere in the background, that's the reason the user started a new instance)
//so just bring the window to front
if (handle != IntPtr.Zero)
{
IntPtr ptrCopyData = IntPtr.Zero;
try
{
// Create the data structure and fill with data
NativeMethods.COPYDATASTRUCT copyData = new NativeMethods.COPYDATASTRUCT();
copyData.dwData = new IntPtr(2);
if (args != null && args.Length > 0)
{
string fileName = args[0];
// Just a number to identify the data type
copyData.cbData = fileName.Length + 1; // One extra byte for the \0 character
copyData.lpData = Marshal.StringToHGlobalAnsi(fileName);
// Allocate memory for the data and copy
ptrCopyData = Marshal.AllocCoTaskMem(Marshal.SizeOf(copyData));
Marshal.StructureToPtr(copyData, ptrCopyData, false);
// Send the message
NativeMethods.SendMessage(handle, NativeMethods.WM_COPYDATA, IntPtr.Zero, ptrCopyData);
}
else
{
PostMessage((IntPtr)HWND_BROADCAST, WM_ACTIVATEAPP, IntPtr.Zero, IntPtr.Zero);
}
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString(), "SendMessage Demo",
MessageBoxButtons.OK, MessageBoxIcon.Error);
}
finally
{
// Free the allocated memory after the control has been returned
if (ptrCopyData != IntPtr.Zero)
{
Marshal.FreeCoTaskMem(ptrCopyData);
}
}
}
else
{
//tough luck, can't activate the window, it's not visible and we can't get its handle
//so instead notify the process that it has to show it's window
PostMessage((IntPtr)HWND_BROADCAST, WM_ACTIVATEAPP, IntPtr.Zero, IntPtr.Zero);//this message will be sent to MainForm
}
break;
}
}
}
}
}
