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I think you are missing the DS_MODALFRAME style from your dialog template. And your message handlers could contain anything - we cannot see the code. As I already suggested to you, get rid of these big defines and put the source in your handler. You will then at least have a chance of finding out what is wrong, as will we. And a better place to learn how to code for Dialogs is at About Dialog Boxes - Win32 apps | Microsoft Docs[^.
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Thank you for your response, unfortunately not DS_MODALEFRAME is the problem
The problem is ( I think ), that when DialogBox function is called in WinMain, its associated procedure function Dlg_ProcDlg_Proc isn't executed.
Richard MacCutchan wrote: And your message handlers could contain anything - we cannot see the code.
Are you reffering to Dlg_OnInitDialog as message handlers? It's code is:
BOOL Dlg_OnInitDialog (HWND hwnd, HWND hwndFocus, LPARAM lParam)
{
RECT rc;
chSETDLGICONS(hwnd, IDI_DIRWALK, IDI_DIRWALK);
GetClientRect(hwnd, &rc);
SetWindowPos(GetDlgItem(hwnd, IDC_TREE), NULL, 0, 0, rc.right, rc.bottom, SWP_NOZORDER);
return(TRUE);
}
And the macro for chSETDLGICONS(hwnd, IDI_DIRWALK, IDI_DIRWALK);  is:
<pre lang="C++">
#define chINITSTRUCT(structure, fInitSize) \
(ZeroMemory(&(structure), sizeof(structure)), \
fInitSize ? (*(int*) &(structure) = sizeof(structure)) : 0)
#define chSETDLGICONS(hwnd, idiLarge, idiSmall) \
{ \
OSVERSIONINFO VerInfo; \
chINITSTRUCT(VerInfo, TRUE); \
GetVersionEx(&VerInfo); \
if ((VerInfo.dwPlatformId == VER_PLATFORM_WIN32_NT) && \
(VerInfo.dwMajorVersion <=3 && \
VerInfo.dwMinorVersion <= 51)) \
{ \
SetClassLong(hwnd, GCL_HICON, (LONG) \
LoadIcon(GetWindowInstance(hwnd), \
MAKEINTRESOURCE(idiLarge))); \
} \
else \
{ \
SendMessage(hwnd, WM_SETICON, TRUE, (LPARAM) \
LoadIcon(GetWindowInstance(hwnd), \
MAKEINTRESOURCE(idiLarge))); \
SendMessage(hwnd, WM_SETICON, FALSE, (LPARAM) \
LoadIcon(GetWindowInstance(hwnd), \
MAKEINTRESOURCE(idiSmall))); \
} \
}
But the program dosen't reach the Dlg_OnInitDialog, I placed a breakpoint there.
What do I miss? If it is really necessary for the clearness of the code I wll add and the macros in code.
And guys please don't get upset on me because I insist to solve this old kind of program, but I am curious about this different style of managing windows messages and please help me to go through.
Thank you 
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coco243 wrote: But the program dosen't reach the Dlg_OnInitDialog, I placed a breakpoint there.
Where is the code for chHANDLE_DLGMSG? I keep telling you to get rid of these ridiculous #define statements; they are just making it more difficult to see what is happening.
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Here it is the code: ( it was in the first post too, I will modify de macros )
#define chHANDLE_DLGMSG(hWnd, message, fn) \
case (message): \
return (SetDlgMsgResult(hwnd, uMsg, HANDLE_##message((hwnd), (wParam), (lParam), (fn))))
Thank you,
modified 19-Aug-22 8:13am.
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So you have a macro inside a macro which just makes it worse. I suggest you throw this code (and that book) away and write a proper inline handler. I have just tested your template and it loads the dialog and handles the WM_INITDIALOG message:
INT_PTR CALLBACK DlgProc(
HWND hDlg,
UINT uMessage,
WPARAM wParam,
LPARAM lParam
)
{
switch (uMessage)
{
case WM_INITDIALOG:
return OnInitDialog(hDlg, (HWND)wParam, lParam);
case WM_COMMAND:
return OnCommand(hDlg, LOWORD(wParam), (HWND)lParam, HIWORD(wParam));
}
return false; }
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I changed the Dlg_Proc as you have said to me.
But my problem is that the program doesn't reach to the DlgProc function to be called.
I don't know why, what to do? but DialogBox function from WinMain doesn't call DlgProc. I think that here is the problem.
When I play the program it doesn't do any thing. Just execute, nothing displaied, and that's it.
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So:
.cpp file
#include <windows.h> // tipul BOOL este definit in windows.h
#include "resource.h"
#include "WindowsX.h"
BOOL Dlg_OnInitDialog (HWND hwnd, HWND hwndFocus, LPARAM lParam)
{
RECT rc;
SendMessage(hwnd, WM_SETICON, TRUE, (LPARAM)LoadIcon(GetWindowInstance(hwnd),MAKEINTRESOURCE(IDI_DIRWALK)));
SendMessage(hwnd, WM_SETICON, FALSE, (LPARAM)LoadIcon(GetWindowInstance(hwnd),MAKEINTRESOURCE(IDI_DIRWALK)));
GetClientRect(hwnd, &rc);
SetWindowPos(GetDlgItem(hwnd, IDC_TREE), NULL, 0, 0, rc.right, rc.bottom, SWP_NOZORDER);
return(TRUE);
}
void Dlg_OnSize ( HWND hwnd, UINT state, int cx, int cy)
{
SetWindowPos(GetDlgItem(hwnd, IDC_TREE), NULL, 0, 0, cx, cy, SWP_NOZORDER);
}
INT_PTR CALLBACK Dlg_Proc (HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
switch (uMsg)
{
case WM_INITDIALOG:
SetDlgMsgResult(hwnd, uMsg, HANDLE_WM_INITDIALOG(hwnd, wParam, lParam, Dlg_OnInitDialog));
break;
}
return(FALSE);
}
int WINAPI WinMain(HINSTANCE hinstExe, HINSTANCE hinstPrev, LPSTR pszCmdLine, int nCmdShow)
{
DialogBox(hinstExe, MAKEINTRESOURCE(IDD_DIRWALK), NULL, Dlg_Proc);
return(0);
}
.rc file
#include "resource.h"
#define APSTUDIO_READONLY_SYMBOLS
#include "afxres.h"
#undef APSTUDIO_READONLY_SYMBOLS
#if !defined(AFX_RESOURCE_DLL) || defined(AFX_TARG_ENU)
LANGUAGE 9, 1
#ifdef APSTUDIO_INVOKED
IDI_DIRWALK ICON DISCARDABLE "DirWalk.Ico"
IDD_DIRWALK DIALOG DISCARDABLE 10, 18, 250, 250
STYLE WS_MINIMIZEBOX | WS_MAXIMIZEBOX | WS_POPUP|
WS_VISIBLE| WS_CAPTION | WS_SYSMENU | WS_THICKFRAME | DS_MODALFRAME
CAPTION "Directory Walk"
FONT 8, "System"
BEGIN
LISTBOX IDC_TREE,0,0,0,0,NOT LBS_NOTIFY |
LBX_NOINTEGRAL_HEIGHT | NOT WS_BORDER |
WS_VSCROLL | WS_HSCROLL | WS_GROUP |
WS_TABSTOP
END
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
#endif // English (United States) resources
#ifndef APSTUDIO_INVOKED
#endif // not APSTUDIO_INVOKED
resource file:
#define IDI_DIRWALK 400
#define IDC_TREE 401
#define IDD_DIRWALK 402
#ifdef APSTUDIO_INVOKED
#ifndef APSTUDIO_READONLY_SYMBOLS
#define _APS_NEXT_RESOURCE_VALUE 101
#define _APS_NEXT_COMMAND_VALUE 40001
#define _APS_NEXT_CONTROL_VALUE 1001
#define _APS_NEXT_SYMED_VALUE 101
#endif
#endif
Why my dialog box isn't displayed?
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In your Dlg_Proc() handler, all messages are returning FALSE. Handled messages should return TRUE.
"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"You can easily judge the character of a man by how he treats those who can do nothing for him." - James D. Miles
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Change this:
SetDlgMsgResult(hwnd, uMsg, HANDLE_WM_INITDIALOG(hwnd, wParam, lParam, Dlg_OnInitDialog));
to this
HANDLE_WM_INITDIALOG(hwnd, wParam, lParam, Dlg_OnInitDialog);
return TRUE;
You only need to set a dialog result when you exit for the last time. And unless you need the result in your calling code then it is best to do nothing.
I think this book is so far behind the times that it is teaching you the wrong things, and the wrong way to do things.
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In my opinion I can change the content of the Dlg_Proc for infinite because I don't know why, the program just don't
get to that Function Procedure.
And I don't know why you are ignoring me when I am telling you that my DialogBox function from WinMain doesn't starts
the Dlg_Proc procedure never. Please explain me that because I don't understand. All I want to do for now is to see
that my program stops at a breakpoint on the Dlg_Proc.
Are VC project settings? This is all the code that I have. I am missing something? Just please explain me why the DialogBox
doesn't starts its procedure.
I know to implplement dialog boxes, I have implemented a few, the problem in this topic is that I can't aproach this kind of message handling procedure. And I am sorry if I repeat myself and you try to explain me and I am not able to understand but... "Why the DialogBox from WinMain doesn't start the Dlg_Proc afferent procedure?"
Thank you,
modified 19-Aug-22 11:27am.
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The DialogBox does start, but because your code is invalid it terminates (almost) immediately. I have changed your DialogProc to the following just to make it work:
INT_PTR CALLBACK Dlg_Proc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
switch (uMsg)
{
case WM_INITDIALOG:
HANDLE_WM_INITDIALOG(hwnd, wParam, lParam, Dlg_OnInitDialog);
break;
case WM_COMMAND:
if (LOWORD(wParam) == IDCANCEL)
{
EndDialog(hwnd, IDCANCEL);
break;
}
return FALSE;
default:
return FALSE;
}
return TRUE;
}
But that is just to get the dialog to start and be able to close it. To do anything useful would require a lot of rewriting, or better still, start clean with up to date code.
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Richard MacCutchan wrote: The DialogBox does start, but because your code is invalid it terminates (almost) immediately. I have changed your DialogProc to the following just to make it work:
The DialogBox does start, but it's procedure Dlg_Proc doesn't start, you can modify this procedeure over and over for
one thousand times, is not the problem there. How invalid the code will be, if I put a break point inside of Dlg_Proc
should stop there, but the program never goes there.
Please listen to me, help me to understand why the MessageBox doesn't start DlgProc procedeure. Maybe are project setings or I don't know. The problem is that the Dlg_Proc is never reched and never executed.
Please take my code where I copied all my file apart .cpp .rc the resource file to see that I am right.
Something is missing to me, I don't know why. Maybe somwthing more is need it but please listen on what I am saying,
the problem is that the MessageBox function doesn't start the Dlg_Proc
modified 19-Aug-22 12:23pm.
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I told you how to fix it, copy the code from my previous message into your DialogProc. I know that works because I have tested it.
If it still does not work for you then there is something else that you are not showing us.
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Richard MacCutchan wrote: I told you how to fix it, copy the code from my previous message into your DialogProc.
I have a lot of respect for people who waste their time to help me, so obviously I tryied what you had said to me.
Richard MacCutchan wrote: If it still does not work for you then there is something else that you are not showing us.
I don't have nothing to not show, so I started over again:
I had created a new "empty" VC++ w32 project and added just these files below(those file are all I got to show ):
.cpp file:
#include <windows.h> // tipul BOOL este definit in windows.h
#include "resource.h"
#include "WindowsX.h"
BOOL Dlg_OnInitDialog (HWND hwnd, HWND hwndFocus, LPARAM lParam)
{
RECT rc;
SendMessage(hwnd, WM_SETICON, TRUE, (LPARAM)LoadIcon(GetWindowInstance(hwnd),MAKEINTRESOURCE(IDI_DIRWALK)));
SendMessage(hwnd, WM_SETICON, FALSE, (LPARAM)LoadIcon(GetWindowInstance(hwnd),MAKEINTRESOURCE(IDI_DIRWALK)));
GetClientRect(hwnd, &rc);
SetWindowPos(GetDlgItem(hwnd, IDC_TREE), NULL, 0, 0, rc.right, rc.bottom, SWP_NOZORDER);
return(TRUE);
}
void Dlg_OnSize ( HWND hwnd, UINT state, int cx, int cy)
{
SetWindowPos(GetDlgItem(hwnd, IDC_TREE), NULL, 0, 0, cx, cy, SWP_NOZORDER);
}
INT_PTR CALLBACK Dlg_Proc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
switch (uMsg)
{
case WM_INITDIALOG:
HANDLE_WM_INITDIALOG(hwnd, wParam, lParam, Dlg_OnInitDialog);
break;
case WM_COMMAND:
if (LOWORD(wParam) == IDCANCEL)
{
EndDialog(hwnd, IDCANCEL);
break;
}
return FALSE;
default:
return FALSE;
}
return TRUE;
}
int WINAPI WinMain(HINSTANCE hinstExe, HINSTANCE hinstPrev, LPSTR pszCmdLine, int nCmdShow)
{
DialogBox(hinstExe, MAKEINTRESOURCE(IDD_DIRWALK), NULL, Dlg_Proc);
return(0);
}
.rc file:
#include "resource.h"
#define APSTUDIO_READONLY_SYMBOLS
#include "afxres.h"
#undef APSTUDIO_READONLY_SYMBOLS
#if !defined(AFX_RESOURCE_DLL) || defined(AFX_TARG_ENU)
LANGUAGE 9, 1
#ifdef APSTUDIO_INVOKED
IDI_DIRWALK ICON DISCARDABLE "DirWalk.Ico"
IDD_DIRWALK DIALOG DISCARDABLE 10, 18, 250, 250
STYLE WS_MINIMIZEBOX | WS_MAXIMIZEBOX | WS_POPUP|
WS_VISIBLE| WS_CAPTION | WS_SYSMENU | WS_THICKFRAME | DS_MODALFRAME
CAPTION "Directory Walk"
FONT 8, "System"
BEGIN
LISTBOX IDC_TREE,0,0,0,0,NOT LBS_NOTIFY |
LBX_NOINTEGRAL_HEIGHT | NOT WS_BORDER |
WS_VSCROLL | WS_HSCROLL | WS_GROUP |
WS_TABSTOP
END
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
#endif // English (United States) resources
#ifndef APSTUDIO_INVOKED
#endif // not APSTUDIO_INVOKED
resource.h file:
#define IDI_DIRWALK 400
#define IDC_TREE 401
#define IDD_DIRWALK 402
#ifdef APSTUDIO_INVOKED
#ifndef APSTUDIO_READONLY_SYMBOLS
#define _APS_NEXT_RESOURCE_VALUE 101
#define _APS_NEXT_COMMAND_VALUE 40001
#define _APS_NEXT_CONTROL_VALUE 1001
#define _APS_NEXT_SYMED_VALUE 101
#endif
#endif
I repeat, I had created a new win32 VC++ empty project and added just these 3 files.
I have to make more settings in VC++ project? Are missing some .h header files that I have to add?
( While posting these, I observed your response Richard about the compiler resource object, thank you very much
for your time trying to help me, I will continue making a hybrid application with my knowledge to continue, in meantime I hope I will find and my need it explanations about this situation, because all I want is to know the basics and then
to start with tones of wrappers and lybraries and so on )
Thank you very much.
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One thing I did notice in your Dialog resource definition was the use of the style value LBX_NOINTEGRAL_HEIGHT. I cannot find a definition of that value anywhere in the Windows header file; I suspect it should be LBS_NOINTEGRAL_HEIGHT.
I don't have time to look at the rest of the above code today, but may be able to get to it tomorrow or next week.
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I would be grateful.
Thank you,
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I just built your program from the code in your previous message. I had to add a couple of minor things in the .rc file because of changes in the Win32 libraries. After building the code it runs successfully; i.e. it shows the main dialog with an empty ListView.
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Can you please tell me where these adjustments were? So I can take a look at me? Teach me how to fix that problems, where to look. Because it can be from the dialog resource to not load properly the DialogBox and not to go to the Dialog procedure from that reason.
Where can be the problem on me? ( I am using VS 2010 and I did't had problems with it until now).
Thank you,
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I do not think they will help since they are just there to simulate what is provided by VS2010. However you can add them to the beginning of the .rc file to see what happens:
#include <winresrc.h>
#define APSTUDIO_INVOKED
#define LBX_NOINTEGRAL_HEIGHT LBS_NOINTEGRALHEIGHT
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Hmmm....
When I am creating a new empty project, when I choose to add a new .rc file, in this .rc file it's added automatically some code in that file, I was glad to see that, BUT!!!  , it's appears that somewhere here was some problems or I wasn't pay attention on something, now I have copied exactly the content of the .rc file provided with the book, and now when I run the project, it's appearing an empty dialog box, it is emty, without the ListWiew, but it's a great start.
I will put tomorrow the content of the file from the book because I am very tired now, and for shure we will see the
critical diferences and for shure I will learn from that.
Whoa, I am so glad, we will find and figure out what the clue is, thank you Richard for your patience.
Thank you,
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Comed back with the differences:
Automated .rc file produced by VC with code introduced by me in bad position:
#include "resource.h"
#define APSTUDIO_READONLY_SYMBOLS
#include "afxres.h"
#undef APSTUDIO_READONLY_SYMBOLS
#if !defined(AFX_RESOURCE_DLL) || defined(AFX_TARG_ENU)
LANGUAGE 9, 1
#ifdef APSTUDIO_INVOKED
IDI_DIRWALK ICON DISCARDABLE "DirWalk.Ico"
<---*******THIS BOLDED TEXT IS IN THE APSTUDIO_INVOKED DEFINITION
<---***** it shouln not be here
<---***** THIS WAS THE FATAL ERROR
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V
IDD_DIRWALK DIALOG DISCARDABLE 10, 18, 250, 250
STYLE WS_MINIMIZEBOX | WS_MAXIMIZEBOX | WS_POPUP|
WS_VISIBLE| WS_CAPTION | WS_SYSMENU | WS_THICKFRAME | DS_MODALFRAME
CAPTION "Directory Walk"
FONT 8, "System"
BEGIN
LISTBOX IDC_TREE,0,0,0,0,NOT LBS_NOTIFY |
LBX_NOINTEGRAL_HEIGHT | NOT WS_BORDER |
WS_VSCROLL | WS_HSCROLL | WS_GROUP |
WS_TABSTOP
END
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
#endif // English (United States) resources
#ifndef APSTUDIO_INVOKED
#endif // not APSTUDIO_INVOKED
So, the dialog definition was placed wrong, inside the APSTUDIO definition and for this reason the DialogBox were failing.
That was the super thing that was busted my brains and others time.
And that LBX_NOINTEGRALHEIGHT generated from VC must transformed in LBS_NOINTEGRALHEIGHT, as you were saying Richard
I almost forgot, this is the code from the book:
#include "Resource.h"
#define APSTUDIO_READONLY_SYMBOLS
#include "afxres.h"
#undef APSTUDIO_READONLY_SYMBOLS
#if !defined(AFX_RESOURCE_DLL) || defined(AFX_TARG_ENU)
#ifdef _WIN32
LANGUAGE LANG_ENGLISH, SUBLANG_ENGLISH_US
#pragma code_page(1252)
#endif // _WIN32
IDI_DIRWALK ICON DISCARDABLE "DirWalk.Ico"
IDD_DIRWALK DIALOG DISCARDABLE 10, 18, 250, 250
STYLE WS_MINIMIZEBOX | WS_MAXIMIZEBOX | WS_POPUP |
WS_VISIBLE | WS_CAPTION | WS_SYSMENU | WS_THICKFRAME
CAPTION "Directory Walk"
FONT 8, "System"
BEGIN
LISTBOX IDC_TREE,0,0,0,0,NOT LBS_NOTIFY |
LBS_NOINTEGRALHEIGHT | NOT WS_BORDER |
WS_VSCROLL | WS_HSCROLL | WS_GROUP |
WS_TABSTOP
END
#ifdef APSTUDIO_INVOKED
1 TEXTINCLUDE DISCARDABLE
BEGIN
"Resource.h\0"
END
2 TEXTINCLUDE DISCARDABLE
BEGIN
"#include ""afxres.h""\r\n"
"\0"
END
3 TEXTINCLUDE DISCARDABLE
BEGIN
"\r\n"
"\0"
END
#endif // APSTUDIO_INVOKED
#endif // U.S. English Resources
#ifndef APSTUDIO_INVOKED
#endif // not APSTUDIO_INVOKED
Remains still the listbox, that is't displayed yet, I don't still know why but now I have hope.
Thank you,
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I just added your corrected .rc file to the project I have and it builds correctly. And when I run it, it shows the (empty) ListBox as expected.
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I have now modified the Dlg_OnInitDialog function as below and the ListBox gets populated with file and directory names.
BOOL Dlg_OnInitDialog(HWND hwnd, HWND hwndFocus, LPARAM lParam)
{
RECT rc;
char szPath[MAX_PATH];
SendMessage(hwnd, WM_SETICON, TRUE, (LPARAM)LoadIcon(GetWindowInstance(hwnd), MAKEINTRESOURCE(IDI_DIRWALK)));
SendMessage(hwnd, WM_SETICON, FALSE, (LPARAM)LoadIcon(GetWindowInstance(hwnd), MAKEINTRESOURCE(IDI_DIRWALK)));
GetClientRect(hwnd, &rc);
SetWindowPos(GetDlgItem(hwnd, IDC_TREE), NULL, 0, 0, rc.right, rc.bottom, SWP_NOZORDER);
strcpy(szPath, "< path to the directory to search >");
DlgDirList(hwnd, szPath, IDC_TREE, 0, DDL_DIRECTORY | DDL_READWRITE);
return(TRUE);
}
Note that the DlgDirList function needs to write into szPath so it must be created in the way I have shown.
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Yes,
My Listbox was empty and I was't observed that it was a Listbox.
Thank you, see you soon with new topics.
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I ran a further test and discovered that the resource compiler did not generate the correct output file. The resulting resource object was missing the dialog, so that was why your code immediately terminated. However, I cannot reproduce your environment as I do not have the old version of Visual Studio. So the corrections I made are to make use of the Visual Studio 2022 environment.
As I keep saying, stop wasting time with this out of date code (and book) and move on to the latest version of Visual Studio, and the associated documentation.
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