C / C++ / MFC

15-Aug-06 22:18

hi all i want to implement windows hooks in service.i had implemented the hooks at the standard application(as DLL) it works fine.but the problem is that it did not worked for the service. i mean callback function is not called when service executed.
tell me what i do. any help is welcomed.

Tasleem Arif

Milton Karimbekallil15-Aug-06 23:36

Re: callback in windows service [modified]

15-Aug-06 23:36

Nt services are running in a difrent window station and desktop called -Service0x0-3e7$\default. All our applications are under Winsta0\default. So there may not be any applications running with an associated window object to invoke the hooked WindoProc.

Try by changing the service type to SERVICE_INTERACTIVE_PROCESS so that the service will run under Winsta0\default desktop.

cheers...Milton KB

_tasleem15-Aug-06 23:56

15-Aug-06 23:56

i think u did not understand my question.
i had implemented hooks as dll and used in desktop application and it works fine.when i use the same dll from service then it did not work i mean setwidows hooks is called and the callback function in response to hook is not called.
and my service is controlled by the SCM and present in services list in the controll panel->admntool->services.
how to do that in i mean changing service type.

-- modified at 6:05 Wednesday 16th August, 2006

Tasleem Arif

Milton Karimbekallil16-Aug-06 0:43

16-Aug-06 0:43

I had understood what exactly u meant. Ur windows hook is not working in a service app while it works fine in a desktop application. This is what I understood before and now as well. The answer is same as before.

Hope you are aware of the fact that the Desktop window is the parent window of all other windows we create using Createwindow() API. Actually this desktop what we are seeing is just one among a number of other desktops which Windows OS keeps invisible(some of them are visible as well. eg: logon desktop). This is a mystery to most of us. Actually there is something called a window station and a window station can have n number of desktops in it. A window station is a secure kernel object that contains a clipboard, a private atom table, a set of desktops, and a set of windows.
see the info http://www.pluralsight.com/wiki/default.aspx/Keith.GuideBook/WhatIsAWindowStation.html[^]

All our applications (including your desktop application what you were talking about) are running under a desktop called Winsta0\default.

But NT Services are running in a different window station and desktop called Service0x0-3e7$\default.

Your hook will not get invoked as there are no windows in the service desktop. So try by changing the service type to SERVICE_INTERACTIVE_PROCESS so that the service will run under Winsta0\default desktop and you will start getting the notifications in the windows hook.

cheers Milton KB

_tasleem16-Aug-06 1:31

16-Aug-06 1:31

thanks for such a descriptive answer, how can i change the service type to SERVICE_INTERFACTIVE_PROCESS only change the create service paramter to this or had to call different api calls for that purpose.
one thing Thank U very Much Again. Smile | :)

Tasleem Arif

Milton Karimbekallil16-Aug-06 3:18

16-Aug-06 3:18

Yes u can use SERVICE_INTERFACTIVE_PROCESS in ur CreateService call.

cheers..Milton KB

_tasleem17-Aug-06 2:01

How to disable USB Enhanced Host Controller by using VC++ code?

17-Aug-06 2:01

it did not work callback function is not called through this technique as well.i had found an article related to the interactive servies at the codeproject.com here is its link
it was showing the icon in the tray what i did is replace the code of showing icons with the method of calling/registering hook's dll. The func of dll that hook the windows.but it did not work 2.Now i had one method use the timer to check whether it will be called or not.
i dont have any thing in mind what to do next.

Tasleem Arif

momer15-Aug-06 22:16

momer

15-Aug-06 22:16

Hi! Sir,

You know that we can disable USB Enhanced Host Controller by hand.That is,
right click my computer,select property,select hardware,click Device Manager,
click General Serial Bus Controller,right click USB Enhanced Host Controller,
select Disable,so,we disabled this device.

Now my question is: how to disable USB Enhanced Host Controller by VC code?
Couse i wanna my usb device run under usb1.1 but not usb2.0,so i have to disable
USB Enhanced Host Controller in my vc code before attach my usb device to pc.

Thanks for any help!

All the blesses we enjoy are the fruits of labor,toil,study and self-denail.

problem with LoadFrame

sach!!15-Aug-06 22:06

sach!!

15-Aug-06 22:06

Hi!

While executing a code ported from VC6 to VC8, I an getting unhandled exception. When I debugged my code I found that LoadFrame() is causing a probelm saying::

First-chance exception at 0x104817fd (msvcp80d.dll) in KPVault.exe: 0xC0000005: Access violation writing location 0x0000424b.<br />
Unhandled exception at 0x104817fd (msvcp80d.dll) in KPVault.exe: 0xC0000005: Access violation writing location 0x0000424b.

I am calling LoadFrame as

CMainFrame* pFrame = new CMainFrame;<br />
pFrame->LoadFrame(IDR_MAINFRAME,<br />
		WS_OVERLAPPEDWINDOW | FWS_ADDTOTITLE, NULL,<br />
		NULL);

I checked all my resources named as IDR_MAINFRAME. Those are a String, Menu, Acceralator, Icon and a Toolbar.

VC6 build for the same code runs just fine. Then What is causing this problem??

Thx.

Linker Error

tom groezer15-Aug-06 22:02

tom groezer

15-Aug-06 22:02

Hi,
I'm getting the following linker error while building a project on x64| Debug. There is no problem while build on XP|Debug.The definition of HtmlHelp is found in windowsddk folder in XP. Is there anything I need to do in terams of finding the corresponding definition on x64. In case I do need to where I can get the definition.

<classname>.obj : error LNK2019: unresolved external symbol HtmlHelpA referenced in function "public: int __cdecl <classname>::LinkToHTMLHelp(unsigned long)" (?LinkToHTMLHelp@CTapas@@QEAAHK@Z)
1>Debug/hpqtap08.dll : fatal error LNK1120: 1 unresolved externals

Thanks

Re: Linker Error

Rage15-Aug-06 23:05

Rage

15-Aug-06 23:05

You get this because the function is not defined for 64bit, probably the prototype is surrounded by #ifdef WINxx or something like that. Find where the 64b version is located, and include it.

~RaGE();

I think words like 'destiny' are a way of trying to find order where none exists. - Christian Graus

Re: Linker Error

tom groezer16-Aug-06 19:57

tom groezer

16-Aug-06 19:57

The prototype of the function is defined as below in the file htmlhelp.h under winxpsdk/include (SDK code) path.

HWND WINAPI HtmlHelp(
HWND hwndCaller,
LPCSTR pszFile,
UINT uCommand,
DWORD_PTR dwData
);
I dont have the cpp file with me and have no idea which extra lib if any is to be included for the x64 platform to execute the build.

Thanks
Ashutosh

Re: Linker Error

tom groezer16-Aug-06 19:57

tom groezer

16-Aug-06 19:57

MFC (database) please help !

Bravoone_200615-Aug-06 22:00

15-Aug-06 22:00

how can i load from my database data to my CListCtrl fast ?because now i must wait up to 10 min to load the data !
i now (WM_TIMER and virtual list that is not a solution for me because i have all the code rady ! must be something ...

this is the code :
the FillList4 is loaded in my oninit dialog !

void CMyList::FillList4()
{

CNote *pNote = new CNote();
pNote->Open();

CString sNrInregistrare;

if (pNote->GetRecordCount())
pNote->MoveFirst();
int x = 0;
while(!pNote->IsEOF())

{
int nItem = m_list4.InsertItem(x, pNote->m_name);
m_list4.SetItemText(nItem, 1, pNote->m_city);
pNote->MoveNext();
x++;
}
pNote->Close();
}

! Remember that : i have 4 CListCtrl to load with data 1 table have ~1000 and ~1500 data
Please help me because i don t have any ideea at all !
Thanks !!!!! Smile | :)

Bravoone

Milton Karimbekallil15-Aug-06 22:34

15-Aug-06 22:34

It looks really weird. What is the hardware configuration of the machine where it took 10 minutes to load this 1000 or 1500 records?

Comment out the data access code and insert the same number of hard coded strings in a loop into the ListCtrls. Check what the time for this is. If it takes less time, then we can confirm that the issue is with db access, may be indexing is missing.

Try this and see what the result is.

cheers..Milton KB

Bravoone_200615-Aug-06 23:22

15-Aug-06 23:22

the computer ...hm... is p4 2,6Ghz , 1Gb memory ,nVidia Gforce 5500 128 M
the computer is not the problem !

Because i need this program to work to p2 233 Mhz ,64 M !
On both computers it takes ~10 min to load the data on my lists ( i have 6 tables - 1 table have ~1000 - 1500 maybe 3000 records ) and all will be loaded ! its a kill ! i don t have any ideea how can i do ...
i remind you must work with my code !
Please help me!!!!!!!!!!!!!1

Bravoone

Bravoone_200615-Aug-06 23:28

15-Aug-06 23:28

the index its coll ,the database works fine (visualfoxpro db ((DBC))

Bravoone

Milton Karimbekallil16-Aug-06 0:54

16-Aug-06 0:54

It looks ur hardware is more than enough and it should not take that much time. So issue is in ur CNote. its better u change that code with ADO or try whatever google link kakan mentioned.

cheers..Milton KB

kakan15-Aug-06 23:29

kakan

15-Aug-06 23:29

The problem might be in your class CNote. What does it look like?

Bravoone_200615-Aug-06 23:40

15-Aug-06 23:40

CNote is CRecordset class default generated by microsoft visual c++

Bravoone

Bravoone_200615-Aug-06 23:41

Re: MFC (database) please help ! [modified]

15-Aug-06 23:41

i have the database on ODBC !

Bravoone

kakan15-Aug-06 23:51

kakan

15-Aug-06 23:51

I Googled around for "CRecordset slow" and found this at http://forums.mysql.com/read.php?45,99701,99721#msg-99721[^]

The text:
Resolved:

Apparently, for whatever reason, Microsoft's CRecordset C/C++ class is literally copying the entire table over to the local client with the CRecordset::Open function.

This is probably why the original coders were using a dynaset when we were using MSACCESS, but when I switched over to MYSQL, dynaset's were not supported with the MySQL/ODBC drivers so I used snapshots instead.

I changed the logic to use a direct SQL command and its lightning fast now.

Try my Google search (and variations). I guess you will find the reason (and the solution) of your problems.

-- modified at 5:52 Wednesday 16th August, 2006
Don't ask me how to run a direct SQL query from your program, Iv'e never done it. But there is heaps of samples out there.

Bravoone_200616-Aug-06 2:58

16-Aug-06 2:58

ok i have find something but it must... change my all code and ... if is another way ?! Please help me !!!!!!!!!!!!!!!!!!!!

i need an example ! please !

Bravoone