C / C++ / MFC

17-Jun-03 1:28

I've run into a strange problem. I'm trying to replace the view for one of my documents (similar to in MS PowerPoint for having different views of the same document), but whenever I call DestroyWindow() on the view, it goes into an infinite loop. Stepping through with the debugger, I found that Windows is constantly sending three of the view's child windows the WM_GETDLGCODE message (it's a CFormView derived class), but only the ones that I created at runtime in the view's OnCreate() handler. Handling the WM_GETDLGCODE message did not stop the messages being sent.

Is this an issue with form views - do they not work correctly with dynamic controls? Or is there something else that could cause this?

Any suggestions are welcome Smile | :)

Ryan

Being little and getting pushed around by big guys all my life I guess I compensate by pushing electrons and holes around. What a bully I am, but I do enjoy making subatomic particles hop at my bidding - Roger Wright (2^nd April 2003, The Lounge)

Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late - John Nichol "Point Of Impact"

Ryan Binns17-Jun-03 2:15

17-Jun-03 2:15

Disregard this. The error is not with the controls. It's somewhere else, but I don't know where Frown | :(

Roger Allen17-Jun-03 2:20

Roger Allen

17-Jun-03 2:20

Are you calling DestroyWindow on the dynamically created children before the call to DestroyWindow on their parent?

Roger Allen
Sonork 100.10016

Were you different as a kid? Did you ever say "Ooohhh, shiny red" even once? - Paul Watson 11-February-2003

Ryan Binns17-Jun-03 2:25

17-Jun-03 2:25

No, in the view's OnDestroy() handler, which at the moment is not getting called.

I've managed to track it down a bit so it sometimes works, depending on which window has the focus at the time, and even then it sometimes works if the frame has the focus, and sometimes doesn't. I think a bit more detective work is needed.

Thanks anyway Smile | :)

Ryan Binns17-Jun-03 16:06

windows login, logout message?

17-Jun-03 16:06

I've fixed the problem but I think I've only stopped the symptoms, not the actual problem. The message sequence being sent was: WM_PARENTNOTIFY to the frame window, WM_SHOWWINDOW to the view (to say it's being hidden). The default handler for WM_SHOWWINDOW was sending all the WM_GETDLGCODE messages to the child windows. All I did was overrode OnShowWindow() and did not call the default. It works perfectly.

I have no idea why the default handler for WM_SHOWWINDOW would send all the messages, and why it was sending them continuously (not just once per window), but at least it works, even if it is a bit of a kludge Unsure | :~

DLL Injection Problems

ganon17-Jun-03 1:23

ganon

17-Jun-03 1:23

I'm current trying to develop a program which can control multiple instances of another program unattended. Simple windows messages won't suffice so I have gone down the track of code injection.

When I have previously used this method it has been straight foreward and i've found it possible to intercept any function I wish. With this program however, the target is written in delphi, I am specifically trying to intercept all of the menu command, especially TrackPopupMenu. Looking in the import table, the program imports them, and when looking through the disassembled code, it actually calls the function, however injection fails to intercept them.

I can hex it into the program to call a function contained within the dll, but this isnt the ideal way, since it wouldn't work if either of the files are changed, injection is a more generic way of doing it.

Is there any easy solution to this dilemma? Is it possible that the program has some protection which prevents the poisioning of its IAT? Or is it simply that Delphie doesn't work in the same way as a similar program in C.. :/

Any help appreciated Smile | :)

NT service

Jamshed Marker17-Jun-03 1:04

Jamshed Marker

17-Jun-03 1:04

I want to learn the basics of NT service. For this purpose i am in search of good and easy tutorial for a beginner. I found tons of tutorials on NT service here at CP, MSDN and other sites. But i am in search of a single good tutorial. Can anyone suggest me the best one in his opinion ?

Re: NT service

XiangYangLiu17-Jun-03 1:45

XiangYangLiu

17-Jun-03 1:45

For help on this site, if you want to write your own NT service, look at PJ Naughter's framework[^] or Nish's article[^].

The question is, what do you want to do with a NT service? It is not easy to figure out how to write a useful NT service. If all you want is make your program running without logon to the box, then my tool[^] may help you. Wink | ;)

Good luck.

OmarLodhi17-Jun-03 0:44

OmarLodhi

17-Jun-03 0:44

Dear All,

i am developing an application in VC++. i want my application to be notified when any user logs in or
logs out from the system. is their any way to do this
please help me.

thanks.

lodhi

Re: windows login, logout message?

Joan M17-Jun-03 1:09

Joan M

17-Jun-03 1:09

yes, buit you'll need to create a GINA.DLL in order to handle that, the login is handled by that DLL in order to make harder to attack/steal user accounts, its a security thing...

hope this helps.

Re: windows login, logout message?

Tarundeep Singh Kalra17-Jun-03 2:05

Tarundeep Singh Kalra

17-Jun-03 2:05

yes , you can do this by GINA dll , you can make your GINA that will have the resorce handle of ur application and you can log it..see MSDN for details
great topic.

Re: .EXE path

Uma Mahes17-Jun-03 0:37

Uma Mahes

17-Jun-03 0:37

use ExtractApppath function to get the
Path of .Exe

CString ExtractAppPath()
{
CString path_buffer;
char drive[_MAX_DRIVE];
char dir[_MAX_DIR];
char fname[_MAX_FNAME];
char ext[_MAX_EXT];

path_buffer = GetAppPath();
_splitpath( path_buffer,drive, dir, fname, ext );

CString AppFilepath = drive;
AppFilepath += dir;
return AppFilepath;
}

CString GetAppPath()
{
char Buffer[_MAX_PATH];

GetModuleFileName(0, Buffer, sizeof(Buffer));
return Buffer;
}

Regards,
Uma Mahes

Re: .EXE path

Rage17-Jun-03 0:42

Rage

17-Jun-03 0:42

GetCommandLine() and parse the CString.

~RaGE();

Re: .EXE path

Michael Andrew17-Jun-03 3:39

Michael Andrew

17-Jun-03 3:39

In addition to using the GetCommandLine() approach, GetModuleFileName() / GetModuleFileNameEx() are neat functions that one may use to find the path of the executing program, which avoids the need to split the path.

MA

Symantec C++ compiler

Member 40314716-Jun-03 23:30

Member 403147

16-Jun-03 23:30

Can we use Symantech C++ compiler version 7.5 on Windows 2000. I installed it on windows 2000 machine and not able to compile any thing. Any help is greatly appreciated.

thanks
Sri

Re: Symantec C++ compiler

David Crow17-Jun-03 3:00

David Crow

17-Jun-03 3:00

Sriramulu wrote:
...not able to compile any thing.

This is fairly vague. Does the compiler not work at all, or just with a particular project? Are there errors in the code that you are compiling?

Reverse Engineer for VISIO

Majid Shahabfar16-Jun-03 23:12

Majid Shahabfar

16-Jun-03 23:12

Hi,
I've used reverse engineer to create UML in VISIO.
now in VISIO is there any functionality for creating automatic flow chart and flow diagram of my project?
Thank u in advance.

UpTime of an application

John-theKing16-Jun-03 22:51

John-theKing

16-Jun-03 22:51

What is the effective way to find the uptime of an application? I have a server application and i want to ask the server its uptime. For this purpose i need to record the time when application starts and then subtract the current time from initial time to get the difference. I want this difference in the format "dd:hh:min:sec", how can i do so ?

skaanji16-Jun-03 23:09

skaanji

16-Jun-03 23:09

You can get current time using W32API function GetLocalTime(LPSYSTEMTIME);

Tarundeep Singh Kalra17-Jun-03 2:07

Tarundeep Singh Kalra

17-Jun-03 2:07

just an idea ..not sure whether right or wrong...what about gettickcount()

Ryan Binns17-Jun-03 2:41

17-Jun-03 2:41

tarundeep singh wrote:
what about gettickcount()

Smile | :)

It would work, but measuring uptime in milliseconds is probably overkill. Using GetSystemTime() will be more than adequate.

Ryan

Being little and getting pushed around by big guys all my life I guess I compensate by pushing electrons and holes around. What a bully I am, but I do enjoy making subatomic particles hop at my bidding - Roger Wright (2^nd April 2003, The Lounge)

Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late - John Nichol "Point Of Impact"

John-theKing17-Jun-03 2:49

John-theKing

17-Jun-03 2:49

tarundeep singh wrote:
gettickcount()

No, i can't use GetTickCount(), because its return value is of 4 bytes, and suppose my computer is up continuously for 2 months then these 4 bytes are not enough to get time difference.