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From: laserbeak43 on 2 Jul 2008 13:45
Hi,
I'm learning windows programming by reading Petzold's old book and I
have some code that gives me an error saying: "IDM_BKGND_WHITE
undeclared identifier" I can't argue with it cause i don't know where
this identifier came from and it's not in the MSDN help. does anyone
have any idea?

// "MenuDemo.c" Line 56 of this file(in the body of the WndProc
function)says: "IDM_BKGND_WHITE undeclared identifier"

#include <windows.h>
#include "resource.h"

#define ID_TIMER 1

LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;

TCHAR szAppName[] = TEXT ("MenuDemo") ;

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

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 = szAppName ;
wndclass.lpszClassName = szAppName ;

if (!RegisterClass (&wndclass))
{
MessageBox (NULL, TEXT ("This program requires Windows
NT!"),
szAppName, MB_ICONERROR) ;
return 0 ;
}

hwnd = CreateWindow (szAppName, TEXT ("Menu Demonstration"),
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT,
CW_USEDEFAULT, CW_USEDEFAULT,
NULL, NULL, hInstance, NULL) ;

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

while (GetMessage (&msg, NULL, 0, 0))
{
TranslateMessage (&msg) ;
DispatchMessage (&msg) ;
}
return msg.wParam ;
}

LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam,
LPARAM lParam)
{
static int idColor [5] = { WHITE_BRUSH, LTGRAY_BRUSH, GRAY_BRUSH,
DKGRAY_BRUSH, BLACK_BRUSH };
static int iSelection = IDM_BKGND_WHITE;
HMENU hMenu;

switch(message)
{
case WM_COMMAND:
hMenu = GetMenu (hwnd);

switch(LOWORD(wParam))
{
case IDM_FILE_NEW:
case IDM_FILE_OPEN:
case IDM_FILE_SAVE:
case IDM_FILE_SAVE_AS:
MessageBeep(0);
return 0;

case IDM_APP_EXIT:
SendMessage (hwnd, WM_CLOSE, 0, 0);
return 0;

case IDM_EDIT_UNDO:
case IDM_EDIT_CUT:
case IDM_EDIT_COPY:
case IDM_EDIT_PASTE:
case IDM_EDIT_CLEAR:
MessageBeep(0);
return 0;

case IDM_BKGND_WHITE:
case IDM_BKGND_LTGRAY:
case IDM_BKGND_GRAY:
case IDM_BKGND_DKGRAY:
case IDM_BKGND_BLACK:

CheckMenuItem(hMenu, iSelection, MF_UNCHECKED);
iSelection = LOWORD(wParam);
CheckMenuItem(hMenu, iSelection, MF_CHECKED);
SetClassLong(hwnd, GCL_HBRBACKGROUND,
(LONG)GetStockObject(idColor[LOWORD(wParam) - IDM_BKGND_WHITE)));

InvalidateRect(hwnd, NULL, TRUE);
return 0;

case IDM_TIMER_START:
if(SetTimer(hwnd, ID_TIMER, 1000, NULL))
{
EnableMenuItem(hMenu, IDM_TIMER_START, MF_GRAYED);
EnableMenuItem(hMenu, IDM_TIMER_STOP, MF_ENABLED);
}
return 0;

case IDM_TIMER_STOP:
KillTimer(hwnd, ID_TIMER);
EnableMenuItem(hmenu, IDM_TIMER_START, MF_ENABLED);
EnableMenuItem(hmenu, IDM_TIMER_STOP, MF_GRAYED);
return 0;

case IDM_APP_HELP:
MessageBox(hwnd, TEXT("Help not yet implemented!"), szAppName,
MB_ICONEXCLAMATION | MB_OK);
return 0;

case IDM_APP_ABOUT:
MessageBox(hwnd, TEXT("Menu Demonstration Program\n")
TEXT("(c)yamama, '93 til infinity"),
szAppName, MB_ICONINFORMATION | MB_OK);
return 0;
}
break;

case WM_TIMER:
MessageBeep(0);
return 0;

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

//resource.h
//{{NO_DEPENDENCIES}}
// Microsoft Visual C++ generated include file.
// Used by menudemo.rc
//
#define IDR_MENU1 101
#define ID_FILE_NEW40001 40001
#define ID_FILE_OPEN40002 40002
#define ID_FILE_SAVE40003 40003
#define ID_FILE_SAVEAS 40004
#define ID_FILE_EXIT 40005
#define ID_EDIT_UNDO40006 40006
#define ID_EDIT_CUT40007 40007
#define ID_EDIT_COPY40008 40008
#define ID_EDIT_PASTE40009 40009
#define ID_EDIT_DELETE 40010
#define ID_BACKGROUND_WHITE 40011
#define ID_BACKGROUND_LIGHTGRAY 40012
#define ID_BACKGROUND_GRAY 40013
#define ID_BACKGROUND_DARKGRAY 40014
#define ID_BACKGROUND_BLACK 40015
#define ID_TIMER_START 40016
#define ID_TIMER_STOP 40017
#define ID_HELP_HELP 40018
#define ID_HELP_ABOUTMENUDEMO 40019

// Next default values for new objects
//
#ifdef APSTUDIO_INVOKED
#ifndef APSTUDIO_READONLY_SYMBOLS
#define _APS_NEXT_RESOURCE_VALUE 102
#define _APS_NEXT_COMMAND_VALUE 40020
#define _APS_NEXT_CONTROL_VALUE 1001
#define _APS_NEXT_SYMED_VALUE 101
#endif
#endif
From: Alf P. Steinbach on 2 Jul 2008 15:02
* laserbeak43:
> Hi,
> I'm learning windows programming by reading Petzold's old book and I
> have some code that gives me an error saying: "IDM_BKGND_WHITE
> undeclared identifier" I can't argue with it cause i don't know where
> this identifier came from and it's not in the MSDN help. does anyone
> have any idea?

It's intended to be defined in "resource.h". And normally that file is
maintained by your resource editor.

Good luck with learning both Windows programming and C,


Cheers,

- Alf

--
A: Because it messes up the order in which people normally read text.
Q: Why is it such a bad thing?
A: Top-posting.
Q: What is the most annoying thing on usenet and in e-mail?
From: laserbeak43 on 2 Jul 2008 16:43
I see. so what's the difference between "ID_BACKGROUND_WHITE " and
"IDM_BKGND_WHITE "
Oh! i see!!! resource.h and .rc only added the ID prefix and not IDM.
I was told just to let these files do their thing and don't bother it
but it seems i'll have to edit it.
wow, couldn't have been more wrong, visual studio totally mangled
everything, just doing what it's expected to do i guess.
hmm i get no errors now but the screen is just white and there should
be menus....

thanks!!
Malik :)

On Jul 2, 3:02 pm, "Alf P. Steinbach" <al...(a)start.no> wrote:
> It's intended to be defined in "resource.h". And normally that file is
> maintained by your resource editor.
>
> Good luck with learning both Windows programming and C,
>
> Cheers,
>
> - Alf
From: laserbeak43 on 2 Jul 2008 22:30
OK, been at this all day, but i can't seem to figure out why i'm
getting just a white window. Does anyone think they could give me some
suggestions?

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
#include <windows.h>
#include "resource.h"

#define ID_TIMER 1

LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;

TCHAR szAppName[] = TEXT ("MenuDemo") ;

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

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 = szAppName ;
wndclass.lpszClassName = szAppName ;

if (!RegisterClass (&wndclass))
{
MessageBox (NULL, TEXT ("This program requires Windows
NT!"),
szAppName, MB_ICONERROR) ;
return 0 ;
}

hwnd = CreateWindow (szAppName, TEXT ("Menu Demonstration"),
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT,
CW_USEDEFAULT, CW_USEDEFAULT,
NULL, NULL, hInstance, NULL) ;

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

while (GetMessage (&msg, NULL, 0, 0))
{
TranslateMessage (&msg) ;
DispatchMessage (&msg) ;
}
return msg.wParam ;
}

LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam,
LPARAM lParam)
{
static int idColor [5] = { WHITE_BRUSH, LTGRAY_BRUSH,
GRAY_BRUSH,
DKGRAY_BRUSH, BLACK_BRUSH } ;
static int iSelection = IDM_BKGND_WHITE ;
HMENU hMenu ;

switch (message)
{
case WM_COMMAND:
hMenu = GetMenu (hwnd) ;

switch (LOWORD (wParam))
{
case IDM_FILE_NEW:
case IDM_FILE_OPEN:
case IDM_FILE_SAVE:
case IDM_FILE_SAVE_AS:
MessageBeep (0) ;
return 0 ;

case IDM_APP_EXIT:
SendMessage (hwnd, WM_CLOSE, 0, 0) ;
return 0 ;

case IDM_EDIT_UNDO:
case IDM_EDIT_CUT:
case IDM_EDIT_COPY:
case IDM_EDIT_PASTE:
case IDM_EDIT_CLEAR:
MessageBeep (0) ;
return 0 ;

case IDM_BKGND_WHITE: // Note: Logic below
case IDM_BKGND_LTGRAY: // assumes that IDM_WHITE
case IDM_BKGND_GRAY: // through IDM_BLACK are
case IDM_BKGND_DKGRAY: // consecutive numbers in
case IDM_BKGND_BLACK: // the order shown here.

CheckMenuItem (hMenu, iSelection, MF_UNCHECKED) ;
iSelection = LOWORD (wParam) ;
CheckMenuItem (hMenu, iSelection, MF_CHECKED) ;

SetClassLong (hwnd, GCL_HBRBACKGROUND, (LONG)
GetStockObject
(idColor [LOWORD (wParam) -
IDM_BKGND_WHITE])) ;

InvalidateRect (hwnd, NULL, TRUE) ;
return 0 ;

case IDM_TIMER_START:
if (SetTimer (hwnd, ID_TIMER, 1000, NULL))
{
EnableMenuItem (hMenu, IDM_TIMER_START,
MF_GRAYED) ;
EnableMenuItem (hMenu, IDM_TIMER_STOP,
MF_ENABLED) ;
}
return 0 ;

case IDM_TIMER_STOP:
KillTimer (hwnd, ID_TIMER) ;
EnableMenuItem (hMenu, IDM_TIMER_START, MF_ENABLED) ;
EnableMenuItem (hMenu, IDM_TIMER_STOP, MF_GRAYED) ;
return 0 ;

case IDM_APP_HELP:
MessageBox (hwnd, TEXT ("Help not yet implemented!"),
szAppName, MB_ICONEXCLAMATION | MB_OK) ;
return 0 ;

case IDM_APP_ABOUT:
MessageBox (hwnd, TEXT ("Menu Demonstration Program\n")
TEXT ("(c) Charles Petzold, 1998"),
szAppName, MB_ICONINFORMATION | MB_OK) ;
return 0 ;
}
break ;

case WM_TIMER:
MessageBeep (0) ;
return 0 ;

case WM_DESTROY:
PostQuitMessage (0) ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//resource.h
//{{NO_DEPENDENCIES}}
// Microsoft Visual C++ generated include file.
// Used by menudemo.rc
//
#define MenuDemo 101
#define IDM_FILE_NEW 40001
#define IDM_FILE_OPEN 40002
#define IDM_FILE_SAVE 40003
#define IDM_FILE_SAVE_AS 40004
#define IDM_APP_EXIT 40005
#define IDM_EDIT_UNDO 40006
#define IDM_EDIT_CUT 40007
#define IDM_EDIT_COPY 40008
#define IDM_EDIT_PASTE 40009
#define IDM_EDIT_CLEAR 40010
#define IDM_BKGND_WHITE 40011
#define IDM_BKGND_LTGRAY 40012
#define IDM_BKGND_GRAY 40013
#define IDM_BKGND_DKGRAY 40014
#define IDM_BKGND_BLACK 40015
#define IDM_TIMER_START 40016
#define IDM_TIMER_STOP 40017
#define IDM_APP_HELP 40018
#define IDM_APP_ABOUT 40019

// Next default values for new objects
//
#ifdef APSTUDIO_INVOKED
#ifndef APSTUDIO_READONLY_SYMBOLS
#define _APS_NEXT_RESOURCE_VALUE 102
#define _APS_NEXT_COMMAND_VALUE 40020
#define _APS_NEXT_CONTROL_VALUE 1001
#define _APS_NEXT_SYMED_VALUE 101
#endif
#endif
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//resource.rc
// Microsoft Visual C++ generated resource script.
//
#include "resource.h"

#define APSTUDIO_READONLY_SYMBOLS
//////////////////////////// /////////////////////////////////////////////////
//
// Generated from the TEXTINCLUDE 2 resource.
//
#include "afxres.h"

/////////////////////////////////////////////////////////////////////////////
#undef APSTUDIO_READONLY_SYMBOLS

/////////////////////////////////////////////////////////////////////////////
// English (U.S.) resources

#if !defined(AFX_RESOURCE_DLL) || defined(AFX_TARG_ENU)
#ifdef _WIN32
LANGUAGE LANG_ENGLISH, SUBLANG_ENGLISH_US
#pragma code_page(1252)
#endif //_WIN32

#ifdef APSTUDIO_INVOKED
/////////////////////////////////////////////////////////////////////////////
//
// TEXTINCLUDE
//

1 TEXTINCLUDE
BEGIN
"resource.h\0"
END

2 TEXTINCLUDE
BEGIN
"#include ""afxres.h""\r\n"
"\0"
END

3 TEXTINCLUDE
BEGIN
"\r\n"
"\0"
END

#endif // APSTUDIO_INVOKED


/////////////////////////////////////////////////////////////////////////////
//
// Menu
//

MenuDemo MENU
BEGIN
POPUP "&File"
BEGIN
MENUITEM "&New", IDM_FILE_NEW
MENUITEM "&Open", IDM_FILE_OPEN
MENUITEM "&Save", IDM_FILE_SAVE
MENUITEM "Save &As...", IDM_FILE_SAVE_AS
MENUITEM SEPARATOR
MENUITEM "E&xit", IDM_APP_EXIT
END
POPUP "&Edit"
BEGIN
MENUITEM "&Undo", IDM_EDIT_UNDO
MENUITEM SEPARATOR
MENUITEM "C&ut", IDM_EDIT_CUT
MENUITEM "&Copy", IDM_EDIT_COPY
MENUITEM "&Paste", IDM_EDIT_PASTE
MENUITEM "De&lete", IDM_EDIT_CLEAR
END
POPUP "&Background"
BEGIN
MENUITEM "&White", IDM_BKGND_WHITE,
CHECKED
MENUITEM "&Light Gray", IDM_BKGND_LTGRAY
MENUITEM "&Gray", IDM_BKGND_GRAY
MENUITEM "&Dark Gray", IDM_BKGND_DKGRAY
MENUITEM "&Black", IDM_BKGND_BLACK
END
POPUP "&Timer"
BEGIN
MENUITEM "&Start", IDM_TIMER_START
MENUITEM "S&top", IDM_TIMER_STOP, GRAYED
END
POPUP "&Help"
BEGIN
MENUITEM "&Help...", IDM_APP_HELP
MENUITEM "&About MenuDemo...", IDM_APP_ABOUT
END
END


#endif // English (U.S.) resources
/////////////////////////////////////////////////////////////////////////////



#ifndef APSTUDIO_INVOKED
/////////////////////////////////////////////////////////////////////////////
//
// Generated from the TEXTINCLUDE 3 resource.
//


/////////////////////////////////////////////////////////////////////////////
#endif // not APSTUDIO_INVOKED

From: laserbeak43 on 2 Jul 2008 22:42
hmm, playing around with the debugger right now, and it dawned on me,
there's no WM_CREATE case in WndProc(). Could this be why? no, it
can't be, cause the window still gets created. tried changing
IDM_BKGND_WHITE to IDM_BKGND_DKGRAY, and nothing happened, it's still
white. so i'm not sure what's going on here.
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