C / C++ / MFC

HANDLE hMutexOneInstance = CreateMutex(NULL, FALSE, _T("Global\\MutexToAvoidMultipleInstances"));
 DWORD dLastErr = ::GetLastError();
 if(dLastErr == ERROR_ALREADY_EXISTS)
 {
           // Here you can use FindWindow based on your window calss/name to get the handle of
           // previous instance.
     CWnd * pPrevCWnd = PreviousInstance();//You have to implement.
     if(pPrevCWnd != NULL)   // If this isn't the first instance
     {
              // In this you should launch the previous window using functions that other replies have
              // suggested. One catch here is if previous instance has some modal dialog open you
              // should set focus to that window. Modal window handle can be retrieved using
              // GetLastActivePopup()[edit] Tried a sample but focus was moving to parent
               need to check more :)[/edit]
        LaunchPrevInstance(pPrevCWnd); // You have to implement..

     }
     else {
         AfxMessageBox("Only one instance is allowed.");
     }
     return FALSE;
 }

<br />
do u have any samples for insert text into frames ...? 

Failure is Success If we learn from it!!

Member 381289 wrote:

I want a console app if command line is present otherwise a GUI application

• A DLL that describe the applicatiomn data and semantics and related "commands"
• An Exe that links the DLL, that provides all the GUI stuff, invoking the DLL "commands"
• An Exe that links the DLL, that provides all the command line parsing stuff, once again invoking thos DLL "commands".

2 bugs found.
> recompile ...
65534 bugs found.

HMODULE hmod = GetModuleHandle(TEXT("OLComDll.dll"));  
  
TCHAR szPath[MAX_PATH + 1] = {0};  
  
DWORD dwLen = GetModuleFileHName(hmod, szPath, MAX_PATH);