Appliction instances synchronization
I wanna know how to synchronize some instances of my application. Imagine that apllication reads ini-file, prepare GUI controls and waits for user action. Second/third application instance can edit ini-file so first instance can interprets ini-file in non correct way. So the question is how to send notification from one instance and how to recieve that message in another instances.
ASKER
I'll wait for tomorrow. But I'm know all (or almost all) about Mutex functions. I want to notify and recieve notification at run-time. Read question more carefull. Waiting for tomorrow (or for your code)...
1.
>>I'm know all (or almost all) about Mutex
so , you don't need my code, but:
HANDLE hMutex = CreateMutex(NULL,TRUE, "wkadip_mutex");
if (hMutex)//real one? MUTEX_ALL_ACCESS
{
if (GetLastError() != ERROR_ALREADY_EXISTS)
{
.....
App.Run();
}
}
CloseHandle(hMutex);
2. For
>>can interprets ini-file in non correct way
You can simple use LockFile Api!
>>I'm know all (or almost all) about Mutex
so , you don't need my code, but:
HANDLE hMutex = CreateMutex(NULL,TRUE, "wkadip_mutex");
if (hMutex)//real one? MUTEX_ALL_ACCESS
{
if (GetLastError() != ERROR_ALREADY_EXISTS)
{
.....
App.Run();
}
}
CloseHandle(hMutex);
2. For
>>can interprets ini-file in non correct way
You can simple use LockFile Api!
ASKER
Sorry, I can't accept this answer. I don't want lock file. I want to know if one instance changed it. Other words: imagine dialog-based application with only one check-box control. You can run more than one instances. Check-box state changing in one instance must chagne state in all another. How can I do that?
ASKER CERTIFIED SOLUTION
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When receiving the WM_COMMAND with BN_CLICKED notification for the first control , send the second window a message ( or Set an event that will release a thread waiting ) to change the check box .
ASKER
This is not an answer I waited for. But it gave me a start point to find answer by meself.
with Api CreateMutex,OpenMutex,
ReleaseMutex. I use this metod
for test existance of same instance,
you can test open some file:
say CreateMutex(and test by opened) befor open , and ReleaseMutex after close.
I hope, it helps. Alex.
BTWE: If you want i can send you my code (tomorrow).