internal static bool CheckExists(string unicalName)
{
// http://snipplr.com/view/19272/ - C#, single-instance-check using mutex
// http://iridescence.no/post/CreatingaSingleInstanceApplicationinC.aspx
bool isOwnedHere;
s_AppStartMutex = new Mutex(true, unicalName, out isOwnedHere);
if (isOwnedHere)
{
return(false);
}
Process me = Process.GetCurrentProcess();
Process[] procList = Process.GetProcessesByName(me.ProcessName);
foreach (Process process in procList) // Debug note: Set Enable the Visual Studio Hosting Process = false.
{
if (process.Id != me.Id) // If the ProcessName matches but the Id doesn't, it's another instance of mine.
{
if (process.MainWindowHandle != IntPtr.Zero)
{
var wndRef = new HandleRef(process, process.MainWindowHandle);
UnsafeNativeMethods.ShowWindowAsync(wndRef, NativeMethods.SW_NORMAL);
UnsafeNativeMethods.SetForegroundWindow(wndRef);
}
else
{
var callback = new SafeNativeMethods.EnumThreadWindowsCallback(FindInvisibleWindow);
SafeNativeMethods.EnumWindows(callback, new IntPtr(process.Id));
GC.KeepAlive(callback);
}
break;
}
}
return(true);
}
internal override void RecreateHandleCore() {
//Debug.Assert( CanRecreateHandle(), "Recreating handle when form is not ready yet." );
NativeMethods.WINDOWPLACEMENT wp = new NativeMethods.WINDOWPLACEMENT();
FormStartPosition oldStartPosition = FormStartPosition.Manual;
if (!IsMdiChild && (WindowState == FormWindowState.Minimized || WindowState == FormWindowState.Maximized)) {
wp.length = Marshal.SizeOf(typeof(NativeMethods.WINDOWPLACEMENT));
UnsafeNativeMethods.GetWindowPlacement(new HandleRef(this, Handle), ref wp);
}
if (StartPosition != FormStartPosition.Manual) {
oldStartPosition = StartPosition;
// Set the startup postion to manual, to stop the form from
// changing position each time RecreateHandle() is called.
StartPosition = FormStartPosition.Manual;
}
EnumThreadWindowsCallback etwcb = null;
SafeNativeMethods.EnumThreadWindowsCallback callback = null;
if (IsHandleCreated) {
// First put all the owned windows into a list
etwcb = new EnumThreadWindowsCallback();
if (etwcb != null) {
callback = new SafeNativeMethods.EnumThreadWindowsCallback(etwcb.Callback);
UnsafeNativeMethods.EnumThreadWindows(SafeNativeMethods.GetCurrentThreadId(),
new NativeMethods.EnumThreadWindowsCallback(callback),
new HandleRef(this, this.Handle));
// Reset the owner of the windows in the list
etwcb.ResetOwners();
}
}
base.RecreateHandleCore();
if (etwcb != null) {
// Set the owner of the windows in the list back to the new Form's handle
etwcb.SetOwners(new HandleRef(this, this.Handle));
}
if (oldStartPosition != FormStartPosition.Manual) {
StartPosition = oldStartPosition;
}
if (wp.length > 0) {
UnsafeNativeMethods.SetWindowPlacement(new HandleRef(this, Handle), ref wp);
}
if (callback != null) {
GC.KeepAlive(callback);
}
}