I'm using a Mutex to check for instances of an app already running and use a message box to inform the user if it's already running but I would like to just have it restore the window to focus (say if its minimized or behind other active windows).
I tried using ShowWindow with SW_RESTORE but that doesn't wanna work, anyone have any ideas?
This has been discussed here:
http://www.cprogramming.com/cboard/s...?threadid=8963
(How do you allow only one instance of an app?)
If you take 'Unregistered' sample code and insert 'No-One's'
sample code into it once GetLastError has returned ERROR_ALREADY_EXISTS then use ShowWindow on the returned handle from FindWindow that should do it.
Which is probably too surreal so (credit to Unregistered & No-One) :
where lpClassName is pointer to class name and lpWindow is pointer to window name.Code:HANDLE hMutex=CreateMutex(NULL, FALSE, "myAppMutex"); if (hMutex) { if (GetLastError() == ERROR_ALREADY_EXISTS) { HWND hwnd=FindWindow(lpClassName, lpWindow); if (hwnd) { ShowWindow(hwnd,SW_SHOW); UpdateWindow(hwnd); //for good measure } } }
I think that should about do it....but don't quote me on that!
This works, just add it to the beginning of WinMain.
Make sure to change the code to reflect your Window class. You don't have to include the SW_MINIMIZE ShowWindow, its just there to make sure the window shows no matter how many other maximized windows you have.Code:/* Vars */ HANDLE hMutex; // Mutex Handle HWND hwndShow; // Find Window HWND /* Create A Mutex To Register Program Is Running */ hMutex = CreateMutex( NULL, FALSE, "myMutex" ); /* If Program Is Already Running, Show Program & Stop */ if (hMutex) { if (GetLastError() == ERROR_ALREADY_EXISTS) { // Replace WINCLASS_HERE with name of your class hwndShow = FindWindow(WINCLASS_HERE, NULL); if (hwndShow) { // Minimize The Program So It Can Be Restored ShowWindow(hwndShow, SW_MINIMIZE); UpdateWindow(hwndShow); // Restore The Program In Its Original State ShowWindow(hwndShow, SW_RESTORE); UpdateWindow(hwndShow); } ExitProcess(1); } }
Last edited by Sindol; 01-24-2002 at 02:54 PM.
