C / C++ / MFC

4-Oct-02 5:05

I created a dialog template using the resource editor, I've change its style to Child and No Border. Now I want to create a class for this template, which inherit from CDialogBar.

The problem is: when use ClassWizard to do this, there is no CDialogBar in the selection for the base class. If I select CDialog there and replace CDialog using CDialogBar manually, later when I want to add any function to my dialogbar class, class wizard will pop those for CDialog.

What do you do? Thanks a lot!

Tomasz Sowinski4-Oct-02 5:16

4-Oct-02 5:16

Probably there are 'CDialog' references in MFC-generated code (message map etc). Also, you can delete .clw file - it will be recreated by ClassWizard.

What exactly do you want to override in CYourDialogBar?

Tomasz Sowinski -- http://www.shooltz.com

*** Si fractum non sit, noli id reficere. ***

lucy4-Oct-02 5:36

4-Oct-02 5:36

For example, I have an edit box in my dialog bar. Some time ago, I have created an edit class which will allow the edit box to accept numbers only.

Now, I want to subclass the CEdit using my CNumEdit.

When the edit box is in a dialog, I do this in OnInitDialog(). Which is what classwizard will point me to. But instead, I should do it in Create() since CDialogBar don't have OnInitDialog().

Maybe I should use the "Class Info" tab of the class Wizard to select "Window" message only, since I know CDialogBar is not dialog, but a CWnd instead.

Tomasz Sowinski4-Oct-02 5:48

4-Oct-02 5:48

I belive CDialogBar will get WM_INITDIALOG. Lack of entry in message list in ClassWizard is just a VC IDE problem. You can always add the entry to message map manually - just have a look at some CDialog-derived class in your program.

Tomasz Sowinski -- http://www.shooltz.com

*** Si fractum non sit, noli id reficere. ***

lucy4-Oct-02 5:46

4-Oct-02 5:46

no, it doesn't. WTF | :WTF:

When I compiled the code, VC++ will complain that OnInitDialog is not a member of CDialogBar, and it leads me to see the declaration. It is not there indeed. Eek! | :eek:

Tomasz Sowinski4-Oct-02 5:59

4-Oct-02 5:59

So just don't call CDialogBar::OnInitDialog in CYourDlgBar::OnInitDialog Smile | :)

However, if all you need is edit subclassing, just provide your own Create. Catching WM_INITDIALOG doesn't make sense if all you need is this single operation.

Tomasz Sowinski -- http://www.shooltz.com

*** Si fractum non sit, noli id reficere. ***

lucy4-Oct-02 5:57

4-Oct-02 5:57

I wonder what you usually do when you want a dialog bar in your application? How do you create the class when you are done with the dialog template? Confused | :confused:

Tomasz Sowinski4-Oct-02 6:20

4-Oct-02 6:20

lucy wrote:
How do you create the class when you are done with the dialog template?

I'd just create the class without IDE help. Or - I'd select 'generic CWnd' and replace CWnd with CDialogBar later in .h and .cpp.

Tomasz Sowinski -- http://www.shooltz.com

*** Si fractum non sit, noli id reficere. ***

lucy4-Oct-02 6:17

What do you put in stdafx.h ?

4-Oct-02 6:17

got it. Thank you!

IDL Question

Ryan B.4-Oct-02 5:02

Ryan B.

4-Oct-02 5:02

I have a large data strucutre that is used in an embedded C application. I have replicated the strucutre in VC++ and put a class wrapper around it. This data structure contains mostly basic data types. However there are a few fields that are fixed length arrays (char []) as string placeholders.

I need to transport this structure to VBA. I have used IDL in order to solve this before. But I was wondering if you guys have any other reccommendations. ?

We are using an excel spread sheet as a tag list for our product. I will use this data to generate a binary file that will be used by our embedded software to configure hardware at run-time.

Any suggestions would be appreciated, until then Im using IDL.

Ryan Baillargeon

Maximilien4-Oct-02 4:58

Maximilien

4-Oct-02 4:58

I know that we ususally put standard MFC includes, but what other things ?

.h files that are never really touched ? .h files that are really global ? even if it offers interface to classes from files that don't need it ( or want it ) ?

Problem is that when I need to add a .h in the stdafx.h it recompiles everything! no a good thing ! ( will recompile the precompile header )

I usually try to limit the stuff that I put in the stdafx.h, and limit the includes in the .h files of my projects, and use a much as possible forward declaration, and put the includes in the .cpp files.

any thoughts, suggestions, ideas ?

Thanks.

Max.

Re: What do you put in stdafx.h ?

Tomasz Sowinski4-Oct-02 5:02

Re: What do you put in stdafx.h ?

4-Oct-02 5:02

You'll need to find some compromise. While you could put lots of stuff into precompiled header, this could slow down the build process. Of course, there's no point at all in including stuff you'll *never* use, but if you have large header with templates used by 1 of 300 source files in the project... then probably you should measure build times.

Tomasz Sowinski -- http://www.shooltz.com

*** Si fractum non sit, noli id reficere. ***

Daniel Turini4-Oct-02 4:59

Daniel Turini

4-Oct-02 4:59

All headers needed by all .cpp files go both to the stdafx and the file. This way, I can both improve code reuse and compiling speed.

"In an organization, each person rises to the level of his own incompetence." Peter's Principle

Re: What do you put in stdafx.h ?

Michael P Butler4-Oct-02 5:03

Michael P Butler

4-Oct-02 5:03

In the stdafx.h I usually put,

My own set of library include files
include files that will need to be used across multiple source files
Header files that don't change very often.

Michael

"I've died for a living in the movies and tv.
But the hardest thing I'll ever do is watch my leading ladies,
Kiss some other guy while I'm bandaging my knee."
-- The Unknown Stuntman

recognize classes

Zizilamoroso4-Oct-02 4:17

Zizilamoroso

4-Oct-02 4:17

In java, I can do something like this:

Object o=GetSomeObject();
if(o instanceof MyObject)
   ...
else
   ...

where MyObject is an Object-derived class.

What's the c++ equivalent for this?

using: [VISUAL STUDIO 6.0] [WIN98/2]

Re: recognize classes

Daniel Turini4-Oct-02 4:26

Daniel Turini

4-Oct-02 4:26

If your compiler has RTTI, you can use dynamic_cast, typeid and type_info.
VC does, if you have RTTI enabled.

"In an organization, each person rises to the level of his own incompetence." Peter's Principle

Query Com Ports.

Anthony98874-Oct-02 3:47

Anthony9887

4-Oct-02 3:47

Is there an API function to query the available com ports on the system.

Thanks

Re: Query Com Ports.

Scott H. Settlemier4-Oct-02 4:20

Scott H. Settlemier

4-Oct-02 4:20

I don't think so. I usually check the registry like so:

set<CString> Ports;
HKEY hSerialComm=0;
RegOpenKeyEx(HKEY_LOCAL_MACHINE,"HARDWARE\\DEVICEMAP\\SERIALCOMM",0,KEY_READ,&hSerialComm)==ERROR_SUCCESS||(hSerialComm=0);
DWORD nValues,nLongestName,nLargestValue;
if (hSerialComm && ::RegQueryInfoKey(hSerialComm,0,0,0,0,0,0,&nValues,&nLongestName,&nLargestValue,0,0)==ERROR_SUCCESS && nValues && nLongestName && nLargestValue)
{
   CString _Name,_Value;
   char* Name=_Name.GetBuffer(nLongestName+1);
   char* Value=_Value.GetBuffer(nLargestValue+1);
   DWORD NameLen,ValueLen,Type;
   for (int i=0;nValues;++i) // need to enumerate until ERROR_NO_MORE_ITEMS
   {
   	NameLen=nLongestName+1;
   	ValueLen=nLargestValue+1;
	LONG Result=::RegEnumValue(hSerialComm,i,Name,&NameLen,0,&Type,(BYTE*)Value,&ValueLen);
	if (Result==ERROR_NO_MORE_ITEMS)
		break;
	else if (Result!=ERROR_SUCCESS)
	{
		break;
	}
	else
	{ // successfully got a value
		--nValues;
		if (Ports.find(Value)==Ports.end())
			Ports.insert(Value);
	}
   }
   _Name.ReleaseBuffer(0);
   _Value.ReleaseBuffer(0);
}
if (hSerialComm)
   RegCloseKey(hSerialComm);

Additionally, I will simply just try to open the first few
ports by typical name. (e.g. COM1 ... COM8)

HWND list

The_Server4-Oct-02 2:23

The_Server

4-Oct-02 2:23

Hi, all...
==========

Can anyone write a function that returns a list of explorer HWNDs ??

for example:
I have 4 winodows running ....
1- "my computer" (HWND= 0x00AA)
2- "c:\folder1\folder2\" (HWND= 0x00BB)
3- app1 (HWND= 0x00CC)
4- app2 (HWND= 0x00DD)

How can I scan all the HWNDs and identify
explorer windows (HWNDs: 0x00AA & 0x00BB in the example)???

Suspicious | :suss:

Thanks in advance Suspicious | :suss:

Tomasz Sowinski4-Oct-02 3:04

4-Oct-02 3:04

You can enumerate all toplevel windows with EnumWindows and check window class with a call to GetClassName for each HWND you get. You'd have to check Explorer windows class name in Spy++. I'm not sure this name remains unchanged between Win9x/NT/2K/XP.

Your other option is searching for process started by explorer.exe, getting its PID and checking the PID for each HWND with GetWindowThreadProcessId. The problem with this approach is that there's no single process enumeration API working across all 32 bit Windows platforms.

Tomasz Sowinski -- http://www.shooltz.com

*** Si fractum non sit, noli id reficere. ***

User 66584-Oct-02 3:11

User 6658

4-Oct-02 3:11

This is the code I used in one of my apps:

EnumWindows(IEEnumProc, 0);

and the enum proc:

BOOL CALLBACK IEEnumProc(HWND hWnd, LPARAM lParam)
{
	char szClass[256];
	GetClassName(hWnd,szClass,256);
	if(strcmp(szClass,"IEFrame") == 0)
	{
	   // hWnd is a InternetExplorer window
	}

	return TRUE;
}

regards
Greg

modified 12-Sep-18 21:01pm.

Tomasz Sowinski4-Oct-02 3:14

4-Oct-02 3:14

But he's after Windows Explorer, not IE. Class name is 'CabinetWClass', at least on my XP box.

Tomasz Sowinski -- http://www.shooltz.com

*** Si fractum non sit, noli id reficere. ***

User 66584-Oct-02 3:19

User 6658

4-Oct-02 3:19

yes, you're right. It must be CabinetWClass instead of IEFrame.

I thought he wants to find IE windows, not explorer windows Blush | :O

modified 12-Sep-18 21:01pm.