Re: FindWindow with class name - how do I set the class name? - C / C++ / MFC Discussion Boards

melwyn9-Dec-03 5:21

9-Dec-03 5:21

I have been the former a few times. Sometimes I just go for an interview to test my skills and get some interesting puzzles to solve Smile | :)

Re: Circular linked list puzzle

melwyn9-Dec-03 5:18

melwyn

9-Dec-03 5:18

No, not Microsoft, but it is in the top 5 software companies in the world.
Btw, do you know other Microsoft interview questions? Smile | :)

FindWindow with class name - how do I set the class name?

srev8-Dec-03 3:23

srev

8-Dec-03 3:23

Hi,

I've an application which another app needs to get a handle to. I plan to use FindWindow but the window name obviously changes (ie has "- untitled" appended to name). Therefore I guess I need to get it by class name. How can I specify a name for the class of the window?

I've looked at modifying it in PreCreateWindow but it seems really complex. Can anyone suggest a simple way of doing this?

(I used Microsoft Spy++ to get the current class of the app window but it says this nonsense: Afx:00400000:b:00010013:00000006:03720353. I'd prefer something more easy to read!)

Thanks,

Simon

Re: FindWindow with class name - how do I set the class name?

srev8-Dec-03 5:08

srev

8-Dec-03 5:08

Okay,

So I kept going at this and I think I managed to register the window class...but now the app won't open. It gives me a message: "Failed to create empty document." What's that about?

S

Re: FindWindow with class name - how do I set the class name?

Mike Dimmick8-Dec-03 5:13

Mike Dimmick

8-Dec-03 5:13

That's one of MFC's self-generated window classes. It tries to cut down on the number of unique classes by generating a class name derived from some of the options in WNDCLASS. The sequence is Afx: followed by

Instance handle (base address of executable/DLL)
Style bits (here CS_HREDRAW | CS_VREDRAW | CS_DBLCLKS)
Cursor handle
Background brush handle (COLOR_WINDOW + 1)
Icon handle

You'll need to call AfxRegisterClass to register your own class and use that instead.

BOOL CMyWnd::PreCreateWindow(CREATESTRUCT& cs)
{
   WNDCLASS wc = { 0 };
  
   wc.style = CS_HREDRAW | CS_VREDRAW;
   wc.lpfnWndProc = DefWindowProc;
   wc.hInstance = AfxGetInstanceHandle();
   wc.hIcon = ::LoadIcon( IDR_MAINFRAME );
   wc.hCursor = AfxGetApp()->LoadStandardCursor( IDC_ARROW );
   wc.hbrBackground = (HBRUSH) ( COLOR_WINDOW + 1 );
   wc.lpszMenuName = NULL;
   wc.lpszClassName = _T( "Your Class Name Here" );
 
   if ( !AfxRegisterClass( &wc ) )
      return FALSE;
 
   cs.lpszClass = wc.lpszClassName;
 
   return TRUE;
}

should do the trick.

Re: FindWindow with class name - how do I set the class name?

srev8-Dec-03 5:34

srev

8-Dec-03 5:34

Mike,

Thanks so much for your time and advice. This seems a much clearer way of doing things. The only problem is I get this error message on compile relating to the line:

wc.lpfnWndProc = DefWindowProc;

error:
cannot convert from 'LRESULT (__thiscall CWnd::* )(UINT,WPARAM,LPARAM)' to 'WNDPROC'

Any idea how to deal with this?

Re: FindWindow with class name - how do I set the class name?

Mike Dimmick8-Dec-03 5:45

Mike Dimmick

8-Dec-03 5:45

Oops! It's picked up CWnd::DefWindowProc, but it should be ::DefWindowProc (i.e. the Windows function of that name). Add the :: before.

Most other examples say to use AfxWndProc, but the MFC source itself (in AfxRegisterWndClass) uses DefWindowProc, so that's what I suggested.

Re: FindWindow with class name - how do I set the class name?

srev8-Dec-03 5:56

srev

8-Dec-03 5:56

Mike,

That's solved all my problems! Thanks so much for your help.

All the best,

Simon

how to replace icon resource from ico file.

Xiaodi_Liu8-Dec-03 3:02

Xiaodi_Liu

8-Dec-03 3:02

Now I can replace icon resource in a .exe file from other .exe file.
I copy code from MSDN about UpdateResource.

But I can not update icon resource from a icon file.

Re: how to replace icon resource from ico file.

David Crow8-Dec-03 8:07

David Crow

8-Dec-03 8:07

In almost the same way. When copying from one EXE to another, you used LoadImage()/LoadResource() followed by LockResource() to get a pointer to the icon's data. You then called UpdateResource() with that pointer. When using an ICO file, the only difference is to use CreateFile() to open the ICO file, followed by ReadFile() to get a pointer to pass to UpdateResource(). Make sense?

Five birds are sitting on a fence.
Three of them decide to fly off.
How many are left?

Window HWND

Ares28-Dec-03 1:22

Ares2

8-Dec-03 1:22

Hello!

How to get handler to window, when i have its ID and its name?

Re: Window HWND

Fredrik Skog8-Dec-03 1:56

Fredrik Skog

8-Dec-03 1:56

HWND hWnd = ::FindWindow(NULL, "Window name");

Cheers,
Fredrik

"Felix qui potuit rerum cognoscere causas."

How to set/change file permissions on NTFS folder on Win2000

Valera2411768-Dec-03 0:42

Valera241176

8-Dec-03 0:42

Using MSDN documentation I can do it with functions SetFileSecurity or SetNamedSecurityInfo but for the folder these permissions do not visible in 'securyty' property sheet of IE(right mouse click on folder->properties). Inspite of this they work fine. How to make them visible there ?
I found VBasic example HOWTO: Set Security on a NTFS Folder Programmatically.
There they set permissions 'for the folder' and for the files... Some one face such a problem.
Appreciate any information. Sleepy | :zzz:

Who knows where to find the source code for ripping CD and encoding track to MP3, OGG, WMA etc?

zhaopzhi8-Dec-03 0:23

zhaopzhi

8-Dec-03 0:23

Just as the suject.

Rap off for you,for me,for our human.

Re: Who knows where to find the source code for ripping CD and encoding track to MP3, OGG, WMA etc?

BaldwinMartin8-Dec-03 3:12

BaldwinMartin

8-Dec-03 3:12

Blade

Best Wishes and Happy Holiday's,
ez_way

Re: Who knows where to find the source code for ripping CD and encoding track to MP3, OGG, WMA etc?

ZoogieZork8-Dec-03 9:10

ZoogieZork

8-Dec-03 9:10

Complete Open Source CD ripper and encoder:
CDex: http://cdexos.sourceforge.net/[^]

For just the encoding part:
LAME (MP3 encoder): http://lame.sourceforge.net/[^]
Ogg Vorbis: http://www.xiph.org/ogg/vorbis/[^]

- Mike

Compiling under Xp for NT

Onkie8-Dec-03 0:20

Onkie

8-Dec-03 0:20

Hi,

I've made a dll for use within a PowerBuilder application. When I compile this dll under Windows Xp it runs well under Windows Xp and Windows 2000. On Windows NT however, it crashes. The problem is due to the fact that, when compiled under Xp the size of the MENUITEMSTRUCT I use is set to 48 while it's 44 on NT. How can I change the coding so it runs on both Xp and NT.

This is the code I use for setting the size:

MENUITEMINFO info
info.cbSize = sizeof MENUITEMINFO;

Thanks in advance,
Aart

Re: Compiling under Xp for NT

Mike Dimmick8-Dec-03 6:14

Mike Dimmick

8-Dec-03 6:14

As long as _WIN32_WINNT is defined to be less than 0x0500, you should be all right.

The hbmpItem member should only be included if _WIN32_WINNT is greater than or equal to 0x0500 (i.e. if you're targetting Windows 2000 or later).

CString to CComBSTR to use for IDirectorySearch

bjolletts7-Dec-03 23:30

bjolletts

7-Dec-03 23:30

Im writing a program that searches an ActiveDirectory database and want the program to take a search argument like "moderator" through a dialog window and the program will search for everyone that is a moderator.

So my search function takes a CString as a parameter

But to use it in the search it must be a LPWSTR (pszSearchFilter).

HRESULT ExecuteSearch(LPWSTR pszSearchFilter, LPWSTR* pAttributeNames, DWORD dwNumberAttributes, PADS_SEARCH_HANDLE phSearchHandle);

I havetried to builda CString that looks like this:
L"(&(objectClass=user)(title=moderator))";

And then it must be converted to LPWSTR or CComBSTR or whatever that works ... any ideas how ?

Thanks in advance !

Re: CString to CComBSTR to use for IDirectorySearch

Mike Beckerleg8-Dec-03 2:42

Mike Beckerleg

8-Dec-03 2:42

Try converting the CString into a _bstr_t

CString searchParameter("the search string");
_bstr_t bstr(searchParameter);

Mike

Re: CString to CComBSTR to use for IDirectorySearch

Jonathan Craig8-Dec-03 2:45

Jonathan Craig

8-Dec-03 2:45

You should be able to do it like this...

CString str("Hack on!");
BSTR bstr = str.AllocSysString();
 
CComBSTR bstrTemp;
bstrTemp.Attach(bstr);

Hack on... Smile | :)

Jonathan Craig
www.mcw-tech.com

Re: CString to CComBSTR to use for IDirectorySearch

bjolletts8-Dec-03 3:21

bjolletts

8-Dec-03 3:21

Thanks guys, got it to work thanks to your tips !

MDI application

Anthony_Yio7-Dec-03 23:00

Anthony_Yio

7-Dec-03 23:00

I have a application developed in MDI.
The strange thing is that it will cause my system utilizing 100% of the CPU usage.

I have checked the OnIdle(), OnTimer and OnUpdateCommandUI but it is not the cause of the problem

Sonork 100.41263:Anthony_Yio

Re: MDI application

David Crow8-Dec-03 8:10

David Crow

8-Dec-03 8:10

You will need to trim the code down to the minimum required to reproduce the problem. Or, you can create a new MDI application and add code to it until the problem appears.

Five birds are sitting on a fence.
Three of them decide to fly off.
How many are left?

How to Comine two numbers, not addition.

Anonymous7-Dec-03 22:41

Anonymous

7-Dec-03 22:41

Please help me. i am a MFC beginner , and i don't know how to combine two numbers in a dialog box. for example: when a and b are entered into Box1 and Box2, In Box3 will show "ab", NOT "a+b" . Please........HELP.

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