Question

I’ve problem with Editing EDIT window (both by writing or sending text to it).
Here’s my code.

Few days ago i had problem for which solution was deleting MSG handling loop from new windows.
Everything would be fine, but it caused another problem. I can’t edit EDIT windows.
When that handling loop is in new window Editing works, when not it doesn’t.

Parent window – MainWindow
Child windows – ChatWindow

There’s very few tutorials about Winapi, so sometimes i have to use code that i don’t fully understand(like 2 Wndproc methods to handle window action’s)

Thank’s for your time

Answer 1

OK here’s the problem, this

ChatWindow::ChatWindow()
{
    ...
    window = CreateWindowEx( WS_EX_CLIENTEDGE, 
        NazwaKlasy,windowTitle,WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT, CW_USEDEFAULT,DEFAULT_WIDTH , 
        DEFAULT_HEIGHT, NULL, NULL, hIns, this );
    ...

and this

okna.push_back(ChatWindow(dwSel,(char*)chBuffer));

In the ChatWindow constructor you store the this pointer (see the last parameter to CreateWindowEx). But when you save the ChatWindow object you save a copy in the okna vector. So the address of the ChatWindow object passed to CreateWindowEx is not the same as the address of the ChatWindow object in your vector.

Instead of std::vector<ChatWindow> okna; you should have a vector of pointers std::vector<ChatWindow*> okna;. That should fix the problem.

The basic issue with your design is that your window objects are not copyable because you are telling Windows what the this pointer is. You should add a private copy constructor and assignment operator to stop you copying them by mistake, like this.

class NewWindow
{
private:
  NewWindow(const NewWindow&); // prevent copying
  NewWindow& operator=(const NewWindow&); // prevent copying
};

Oh, and I second what Jerry says, get a copy of Petzold.