Why are some textboxes not accepting Control + A shortcut to select all by default

Question

I have found a few textboxes here and there in my program that accepts Control+A shortcut to select the entire text \"by default\" with \"no coding\".

I don\'t know

Answer 1

This question wants an answer that cannot be given in the form of code avoidance, as the Win32 API at the core of the other methods doesn't allow it. If other methods DO allow it, they are just writing the code for you. :)

So the real question is: What is the smallest, neatest way to do it? This worked for me:

First, there is no need to handle WM_KEYDOWN! And no need to test for the Ctrl key already down either. I know that most examples here (and CodeProject and many other places) all say there is, but it does not cure the beep that results whenever a WM_CHAR arises that is not handled.

Instead, try handling WM_CHAR and doing the Ctrl+A selection there:

LRESULT CALLBACK Edit_Prc(HWND hwnd,UINT msg,WPARAM wParam,LPARAM lParam){
  if(msg==WM_CHAR&&wParam==1){SendMessage(hwnd,EM_SETSEL,0,-1); return 1;}
  else return CallWindowProc((void*)WPA,hwnd,msg,wParam,lParam);
}

Remember to subclass the EDIT control to this Edit_Prc() using WPA=SetWindowLong(...) where WPA is the window procedure address for CallWindowProc(...)