I would suggest the opposite: do the real work in a separate thread (in this case, the upload of the files) and regularly send messages with the current status to the progress dialog (which is in the main thread).
Yes, in your case, the progress dialog won't be a modal dialog (althought you call DoModal) because it is started in a separate thread. So, the user will still be able to interract with the main UI during the file upload, which is in general what you don't want.
Also, you still need to send messages (or find another way to communicate between the threads) because your dialog isn't aware of the current status of the upload. So, it doesn't make a difference.
I am facing the problem of memory leak. In one of the application I am taking dynamic global object. And when I try to delete then in my WinMain() function before return 0; statement but it gives me assertion errror.
"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow Never mind - my own stupidity is the source of every "problem" - Mixture
The memory leak control implemented on the CRT overloads the new and delete operators to add some extra memory to contain some signatures that are tracked by a global data structure.
At end, is something is wrong between this structure and the related allocated memory a warning is reported.
In your case your obj pointer is also a global data. But since the initialization order of global data is not predictable (in the sense that it depends on the order the linker links the modules) probably your "new" call happens before the tracking structure is properly initialized (hence, it isn't tracked).
But the delete is. Hence the misleading and the resulting report.
Now allocation and deallocation are wrapped in ctor / dtor.
When thehandle is created the compiler will place an "atexit" to invoke the destructor.
Since the order of destruction is the inverse of the order of construction, you're so granted that either both new and delete are tracked or none of them is. Both case are coherent.
I see just now ThatsAlok writing "use auto_ptr".
In fact std::auto_ptr behave just like myhandle in respect to construction / destruction.
Your program is not causing any assertion, but the following is. May be you are doing something like this -
p = new char;
myclass *obj = new myclass();
myclass *obj2 = new myclass();