[dchapyshev] 33171: - Don't be loaded more than one copy of the application (based on mutex)

Author: dchapyshev
Date: Sun Apr 27 12:14:58 2008
New Revision: 33171

URL: http://svn.reactos.org/svn/reactos?rev=33171&view=rev
Log:
- Don't be loaded more than one copy of the application (based on mutex)

Modified:
    trunk/reactos/base/applications/kbswitch/kbswitch.c

Modified: trunk/reactos/base/applications/kbswitch/kbswitch.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/base/applications/kbswitch…
==============================================================================
--- trunk/reactos/base/applications/kbswitch/kbswitch.c [iso-8859-1] (original)
+++ trunk/reactos/base/applications/kbswitch/kbswitch.c [iso-8859-1] Sun Apr 27 12:14:58
2008
@@ -9,6 +9,9 @@
 #include "kbswitch.h"
 
 #define WM_NOTIFYICONMSG (WM_USER + 248)
+
+TCHAR szKbSwitcherName[] = _T("kbswitcher");
+
 
 static BOOL
 GetLayoutID(LPTSTR szLayoutNum, LPTSTR szLCID);
@@ -370,6 +373,11 @@
 {
     WNDCLASS WndClass = {0};
     MSG msg;
+    HANDLE hMutex;
+
+    hMutex = CreateMutex(NULL, FALSE, szKbSwitcherName);
+    if ((!hMutex) || (GetLastError() == ERROR_ALREADY_EXISTS))
+        return 1;
 
     hInst = hInstance;
     hProcessHeap = GetProcessHeap();
@@ -383,12 +391,12 @@
     WndClass.hCursor       = NULL;
     WndClass.hbrBackground = NULL;
     WndClass.lpszMenuName  = NULL;
-    WndClass.lpszClassName = _T("kbswitch");
+    WndClass.lpszClassName = szKbSwitcherName;
 
     if (!RegisterClass(&WndClass))
         return 1;
 
-    CreateWindow(_T("kbswitch"), NULL, 0, 0, 0, 1, 1, HWND_DESKTOP, NULL,
hInstance, NULL);
+    CreateWindow(szKbSwitcherName, NULL, 0, 0, 0, 1, 1, HWND_DESKTOP, NULL, hInstance,
NULL);
 
     while(GetMessage(&msg,NULL,0,0))
     {
@@ -396,5 +404,7 @@
         DispatchMessage(&msg);
     }
 
+    CloseHandle(hMutex);
+
     return 0;
 }