Re: "edit" control is read only?

From:
=?Utf-8?B?Um9iYnk=?= <Robby@discussions.microsoft.com>
Newsgroups:
microsoft.public.vc.language
Date:
Sat, 15 Jul 2006 22:52:01 -0700
Message-ID:
<F1ADF72D-0FEE-4724-B862-22E089748BC9@microsoft.com>
Hi John!

okay... it works!

I took out the WS_CAPTION and I was able to access the edit control by
simply clicking on it, however my window just turned into a plain square! Not
very attractive I thought!

So I went back to our old post and I changed my CreateWindow() function to
an Owned window. I have not really done any owned windows before, so I took a
stab at it and I coded it like this:

hdCWdws[1] = CreateWindow( szCW2_ClassName,szCW2_Name,
    WS_CAPTION | WS_SYSMENU,
    10, 10, 700, 450,hwnd,NULL,
    (HINSTANCE) GetWindowLong(hwnd,GWL_HINSTANCE),NULL);

and it worked like a charm!

But what do you mean when you say:

"You supply the HWND of the owner the same way you supply the HWND of a
parent"

Do you mean as I did above. as in the 8th parameter "hwnd", this is the
handle to this window past in from windows! So as we refer to your statement,
is hwnd the owner ? Sorry if I am confused on this!

I put the ID as NULL, I don't know if this okay?

I tried it with all my applications circles and graphics and everything
seems to work fine!

So from now on would it be better to always use owned windows as opposed to
child windows?

Its late, and I am calling it a day! I thankyou very much for your support!
You have been very helpfull. I see that I have lots to learn.

Have a great day!

--
Kind regards
Roberto

"John Carson" wrote:

"Robby" <Robby@discussions.microsoft.com> wrote in message
news:1389860C-CB43-4800-8EE5-6E85257EF01D@microsoft.com

Hello John/newsgroups!

I have come down to 3 simple files containing pretty much the minimal
standard code required to get an edit control to work... here is the
actual code... I am still having the problem...Usually when you click
on an edit control, it supposed to automatically get the focus and we
should be able to type text in there! If I may politely ask someone
to take a glimpse at the following code and see why I can't edit the
edit control field by simply clicking on it!

==============================================Main.cpp
#include <windows.h>

//DECLARE CALLBACKS
LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM);
LRESULT CALLBACK WndProc_CW2 (HWND, UINT, WPARAM, LPARAM);

//Name and Class name of main window
static TCHAR *szMW_Name = TEXT ("MAIN APPLICATION 1");
static TCHAR szMW_ClassName[] = TEXT ("MW");

//Child window #2 (Programming GUI)
static TCHAR szCW2_ClassName[] = TEXT("CW2");

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInnstance,
PSTR szCmdLine, int iCmdShow)
{
HWND hwnd;
MSG msg;
WNDCLASS wndclass;

//-MAIN WINDOW CONFIGURATION
wndclass.style = CS_HREDRAW |CS_VREDRAW;
wndclass.lpfnWndProc = WndProc;
wndclass.cbClsExtra = 0;
wndclass.cbWndExtra = 0;
wndclass.hInstance = hInstance;
wndclass.hIcon = LoadIcon (NULL, IDI_APPLICATION);
wndclass.hCursor = LoadCursor (NULL, IDC_ARROW);
wndclass.hbrBackground = (HBRUSH) GetStockObject(WHITE_BRUSH);
wndclass.lpszMenuName = NULL;
wndclass.lpszClassName = szMW_ClassName;
//-REGISTRATION
RegisterClass (&wndclass);

// CHILD WINDOW #2 CONFIGURATION
wndclass.style = CS_HREDRAW |CS_VREDRAW;
wndclass.lpfnWndProc = WndProc_CW2;
wndclass.hIcon = LoadIcon (NULL, IDI_EXCLAMATION);
wndclass.hIcon = NULL;
wndclass.hbrBackground = (HBRUSH) GetStockObject(WHITE_BRUSH);
wndclass.lpszClassName = szCW2_ClassName;
//-REGISTRATION
RegisterClass(&wndclass); //Programming GUI

//-CREATE MAIN APPLICATION WINDOW
hwnd = CreateWindow (szMW_ClassName,szMW_Name,
WS_OVERLAPPEDWINDOW ,
20, 20, 750, 550, NULL,NULL, hInstance, NULL);

ShowWindow(hwnd, iCmdShow);
UpdateWindow (hwnd);

while (GetMessage (&msg, NULL, 0, 0)) //Window's queue loop
{
  TranslateMessage(&msg);
   DispatchMessage(&msg);
}
return (int) msg.wParam;
}
================================================

=======================================WndProc.cpp
#include <windows.h>

struct hdMW_WindowButtonsTAG
{
int iCTL_idx;
TCHAR *szMW_btC_Name;
int MW_btC_RectLeft;
int MW_btC_RectTop;
int MW_btC_RectRight;
int MW_btC_RectBottom;
int MW_btC_ID;
};

#define CW2_ID 2 //Child window ID
//Child window title bar name
static TCHAR *szCW2_Name = TEXT("Programming GUI");
//Child window class name
extern TCHAR szCW2_ClassName[] = TEXT("CW2");

LRESULT CALLBACK WndProc(HWND hwnd, UINT message,
                                            WPARAM wParam, LPARAM
lParam) {
int i;

//MAIN CONTROL PROPERTIES
hdMW_WindowButtonsTAG WindowButtons[] =
{
1,TEXT("< EXIT >"),650,450,80,40,1,
2,TEXT("< Connect! >"),10,30,180,30,2,
3,TEXT("< GUI >"),200,30,180,30,3,
};

//Child window handle(s)
static HWND hdCWdws[2];
static HWND hdMW_WindowButtons[3]; //Main window buttons

switch(message)
{
   case WM_CREATE:
   //MAIN WINDOW BUTTON CONTROLS
  for(i=0;i<3;i++)
{
hdMW_WindowButtons[i] = CreateWindow( TEXT
("button"),WindowButtons[i].szMW_btC_Name,
WS_CHILD | WS_VISIBLE |BS_PUSHBUTTON | WS_CLIPSIBLINGS,
WindowButtons[i].MW_btC_RectLeft,
WindowButtons[i].MW_btC_RectTop,
WindowButtons[i].MW_btC_RectRight,
WindowButtons[i].MW_btC_RectBottom,
hwnd,(HMENU)WindowButtons[i].MW_btC_ID,
(HINSTANCE) GetWindowLong(hwnd,GWL_HINSTANCE),NULL);
}
return 0;

case WM_COMMAND:

//IF EXIT BUTTON CLICKED THEN EXIT APPLICATION
if (LOWORD(wParam) == WindowButtons[0].MW_btC_ID)
{
DestroyWindow(hwnd); //End application
}
//CREATE CHILD WINDOW #2 WHEN BUTTON #2 PRESSED
else if (LOWORD(wParam) == WindowButtons[2].MW_btC_ID)
hdCWdws[1] = CreateWindow(
           szCW2_ClassName,szCW2_Name,
                        WS_CHILD | WS_CAPTION | WS_SYSMENU,
         10, 10, 700, 450,hwnd,(HMENU)CW2_ID,
                        (HINSTANCE)
GetWindowLong(hwnd,GWL_HINSTANCE),NULL);

 BringWindowToTop(hdCWdws[1]);

//SHOW CHILD WINDOW #2
ShowWindow(hdCWdws[1],SW_SHOW);
return 0;

case WM_DESTROY:
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hwnd,message,wParam,lParam);
}
=================================================

=========================================WndProc_CW2.cpp
#include <windows.h>

struct hdCW2_WindowButtonsTAG
{
int iCTL_idx;
TCHAR *szMW_btC_Name;
int MW_btC_RectLeft;
int MW_btC_RectTop;
int MW_btC_RectRight;
int MW_btC_RectBottom;
int MW_btC_ID;
};

LRESULT CALLBACK WndProc_CW2(HWND hwnd, UINT message,
                                                WPARAM wParam, LPARAM
lParam) {
static HWND HWND1;

switch(message)
{
case WM_CREATE:
HWND1 = CreateWindow( TEXT ("edit"), TEXT("zero"),
WS_CHILD | WS_VISIBLE | WS_BORDER |
ES_LEFT | ES_MULTILINE, 10,10,50,30, hwnd,(HMENU)800,
(HINSTANCE) GetWindowLong(hwnd,GWL_HINSTANCE),NULL);
return 0;

case WM_CLOSE: //Handler to do code on close
break;
}
return DefWindowProc(hwnd,message,wParam,lParam);
}

==================================================

All feedback greatly appreciated!


Your problem is that you have a caption bar on a child window. You can get
away with this to a limited degree (just as you can get away with child
windows that overlap to a degree), but it gives you problems when you want
to have a child of a child. I think it is just a bug in Windows.

You can easily confirm that if you remove the WS_CAPTION style from WINDOW
#2, then the problem goes away (add the WS_BORDER style, so you can see what
is happening).

Two possibilities:

1. Use owned windows rather than child windows, as per an earlier post of
mine.

2. Create a MDI application (Petzold, Chapter 19).

There are more elaborate options, like "faking" a title bar, but I don't
think you want to go there.

--
John Carson

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