Re: Non-GUI Application with small memory consumption... - C / C++ / MFC Discussion Boards

Re: Non-GUI Application with small memory consumption... [modified]

Moak22-Mar-08 4:42

Moak

22-Mar-08 4:42

Shy Agam wrote:
My goal is to make the Mem Usage column display 320k or less...

Even though that is not the memory that the application will consume?

Who is repsonsible for those requirements, would he consider using a root kit that hides the presence of the process from the task manager? Just kidding... you are misinterpreting the data returned from the task manager. What you see there is something like the size of the virtual address space in use which includes system DLLs... but no empty WinMain() application will use up 320K free system memory, how could an empty program waste multiple KB? See How big is my program[^].

Hope it helps Smile | :)

My Webchat

modified on Saturday, March 22, 2008 10:53 AM

Re: Non-GUI Application with small memory consumption...

Shy Agam22-Mar-08 4:50

Shy Agam

22-Mar-08 4:50

Moak wrote:
Who is repsonsible for those requirements, would he consider using a root kit that hides the presence of the process from the task manager? Just kidding...

Hehe... That was funny... Smile | :)

There's an existing app which consumes about 300k.
It's basically the same as the one I'm supposed to write, but it lacks some basic must-have features/abilities, and needs some improvements...

The goal is to keep this kind of memory usage, but improve the app, in order not to "pay a large price" for the improvements...

Re: Non-GUI Application with small memory consumption...

Moak22-Mar-08 4:56

Moak

22-Mar-08 4:56

Shy Agam, I modified my last answer with a link to an article here on CP. Please have a look.

/M

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Re: Non-GUI Application with small memory consumption...

Shy Agam22-Mar-08 5:09

Shy Agam

22-Mar-08 5:09

I read the article... Thanks...

Re: Non-GUI Application with small memory consumption...

rp_suman22-Mar-08 4:38

rp_suman

22-Mar-08 4:38

Moak could be right, task manager may show not only the program size but linked DLLs etc..

You make sure, the memory size means runtime memory shown by task manager or just the exe file size.
Whats the exe file size?

Best Regards,
Suman

btw, my vc 2005 trial version has been expired, so I could not try, just telling ideas

Re: Non-GUI Application with small memory consumption...

Shy Agam22-Mar-08 5:08

Shy Agam

22-Mar-08 5:08

It doesn't matter... I was put on certain constraints... I have to enforce them...

Maybe I can remove dependencies from my app...(?)
According to previous posts, it should affact the MemUsage column...

Re: Non-GUI Application with small memory consumption...

rp_suman22-Mar-08 5:15

rp_suman

22-Mar-08 5:15

Hi,

All the best to solve the problem!!

Please let me know when you find solution

Best Regards,
Suman

Re: Non-GUI Application with small memory consumption...

David Crow24-Mar-08 6:26

David Crow

24-Mar-08 6:26

Shy Agam wrote:
I was put on certain constraints... I have to enforce them...

That's all well and good, but you must use the right tool to measure with. Task Manager is not that tool.

"Normal is getting dressed in clothes that you buy for work and driving through traffic in a car that you are still paying for, in order to get to the job you need to pay for the clothes and the car and the house you leave vacant all day so you can afford to live in it." - Ellen Goodman

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

DateTime in MFC application

Sushma K21-Mar-08 23:47

Sushma K

21-Mar-08 23:47

Hello All,

How to get present Date Time in MFC application?

Thanks

Re: DateTime in MFC application

CPallini22-Mar-08 0:14

CPallini

22-Mar-08 0:14

CTime::GetCurrentTime() [^]
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

Re: DateTime in MFC application

Sushma K22-Mar-08 0:36

Sushma K

22-Mar-08 0:36

Thanks, GetCurrentTime() works but the function does not show up in the member list.

Re: DateTime in MFC application

CPallini22-Mar-08 2:35

CPallini

22-Mar-08 2:35

Sushma K wrote:
but the function does not show up in the member list.

Why bother about?

Re: DateTime in MFC application

Paresh Chitte23-Mar-08 23:40

Paresh Chitte

23-Mar-08 23:40

Delete *.ncb files from your project folder.

Regards,
Paresh.

Re: DateTime in MFC application

Rajkumar R22-Mar-08 0:17

Rajkumar R

22-Mar-08 0:17

Date And Time MFC[^]

Stack register/pointer problem

ForNow21-Mar-08 11:25

ForNow

21-Mar-08 11:25

Hi,

I writting a C++/DLL interface to a C/DLL

I export this function in the C++ DLL and import it in the C DLL

The problem, I am passing The C++ DLL function 3 paramters

The First thing I do in this function is Build a C++ object

via new function/method (hope I using the the right

terminalogy)

What happens my second parm in the fuction gets overlaid

With the size of the object as that is (I guess the first parm to

the the new method/function)

How do I know this?? I step thru this in disassembly mode

example of what I am taking about

objptr is declared in Global storage above DLLMAIN

if that make a difference

__declspec(export) cplusplus(char *a, int b, int c)
{

objptr = new OBJECT(a,b,c);

Re: Stack register/pointer problem

Arman S.21-Mar-08 13:14

Arman S.

21-Mar-08 13:14

As far as I could understand you have problems with argument values of your exported/imported function...
Anyway, I see a problem here; you should declare your function as extern "C" when both exporting and importing it (to overcome differences between C and C++ when calling the same function in both)

Your example should be:

extern "C" __declspec(export) cplusplus(char *a, int b, int c)
{

--
=====
Arman

Re: Stack register/pointer problem

ForNow22-Mar-08 14:35

ForNow

22-Mar-08 14:35

in my declaration of the fuction I am

However in the actual code do I need to preface the function with extern "C" too ???

Thankx

Re: Stack register/pointer problem

Arman S.23-Mar-08 0:11

Arman S.

23-Mar-08 0:11

Yes (I think you mean the definition by saying 'actual code'). Something like so;

// mydll.h
extern "C" __declspec(dllexport) int myFunc();

// mydll.cpp
extern "C" __declspec(dllexport) int myFunc()
{
// the body
}

// Inside the client..
extern "C" __declspec(dllimport) int myFunc();

--
=====
Arman

Re: Stack register/pointer problem

ForNow23-Mar-08 2:08

ForNow

23-Mar-08 2:08

I think that (extern "C") and the fact that I was using LOCAL variables between calls to the exported functions might have been the problem (as it now works). Let me explains what I mean by the former

What I had was the follwing
#define MYEXPORT extern "C"

MYEXPORT int a(int c) <--- call DLL export func a
{
int b

.
.
.

return b

}

MYEXPORT int d(int b) <--- Call DLL export function d
{
.
.
.
.
return

Since since "b" was a local variable in a {defined on the stack after the input and output variables

it is storage are is not perserved between Calls

What I did was declare b as "static" I think then b's storage area gets declared in a different area as a Global variable maybe off the the Data Segment register

Anyway this seemed to make it work

Let me know if any of whay I am saying makes sense

Thankx

How to reference tlb file in VC++

Jahnson K21-Mar-08 11:21

Jahnson K

21-Mar-08 11:21

Hi All,

I have generated a tlb file through idl for the implementation of COM.
I want to use this COM object in my VC++ code.
Anybody know how to reference tlb file in VC++ code.
For VB I can directly reference the tlb file, but I dont dont know is there any way we can reference tlb file in my VC++ code and start using the methods inside COM object

Thanks in Advance
JK

Reply·

Re: How to reference tlb file in VC++

Arman S.21-Mar-08 13:46

Arman S.

21-Mar-08 13:46

Using .tlb in C++ is not so straightforward as in VB, but possible.

Generally, the following example may guide you how to use type libraries in VC++;

#import "MyPath\MyTypeLib.tlb" rename_namespace("SmthLooksMeNice") using namespace SmthLooksMeNice;
#include <objbase.h>

int main()
{
CoInitialize(NULL);


// Assume your COM object is named MyComObjectName
// and there is an interface IMyComObject.
// #import generated a smart pointer over that interface.
IMyComObjectPtr pObject(_uuidof(MyComObjectName));

BSTR temp = pObject->SomeProp;
pObject->DoSmth();
//...
CoUninitialize();
return 0;
}

--
=====
Arman

Re: How to reference tlb file in VC++

Jahnson K25-Mar-08 7:46

Jahnson K

25-Mar-08 7:46

Hi Arman,

Thanks for the sample code
I did import my tlb file with rename_namespace("MYNAMESPACE") option
I got following two compilation errors
1) error C2664: '_com_issue_errorex' : cannot convert parameter 2 from MYNAMESPACE::MYCLASS *const ' to 'IUnknown *'
2) error C2504: 'AnyObject' : base class undefined

I tried import using following command
#import "C:\temp\Mytlb.tlb" rename_namespace("MYNAMESPACE") raw_interface_only

The first compliation error went off but the second error
error C2504: 'AnyObject' : base class undefined
still exists.

When I see my tlh file my class is deriving from AnyObject base class.
I am not sure why it is deriving from AnyObject?
Is there any base class called "AnyObject" in C++? If yes what are the include files i need to include? Please help me.

Thanks in advance.

Regards
JK

Re: How to reference tlb file in VC++

Jahnson K27-Mar-08 13:02

Jahnson K

27-Mar-08 13:02

Hi Arman,

I found out the solution for error C2504: 'AnyObject' : base class undefined
My tlb is dependent on some other tlb so, what i did is I #import the base tlb before importing my tlb. It complies fine. There are no errors.

But, I am not able to get pointer to my COM object, when I am running following sample code

CoInitialize(NULL);
IMyComObject pObject(_uuidof(MyComObjectName));

I am getting following error in CoCreateInstance method
0x80040154 Class Not Registered

I checked the registry, there is an entry for my typelib.

I am not sure why it is not able find the class.

Any suggestions/help please..

Thanks in advance
JK

Using resources with subclassed controls.

Amaroqwlf21-Mar-08 8:22

Amaroqwlf

21-Mar-08 8:22

Is it possible to use resources with subclassed controls? If so, how? After creating a control with hControl = CreateWindow( ... ), is there a function I can call that will use a resource to format it (or a different function to use besides CreateWindow)? I only know how to use resources with menus and dialog boxes at this point. I've looked through many examples and I've tried many searches, but I've yet to see this done. As such, I'm asking the question here.

Re: Using resources with subclassed controls.

Mark Salsbery21-Mar-08 8:41

Mark Salsbery

21-Mar-08 8:41

I'm not sure what you mean here.

Have you subclassed an existing Windows common control or do you have your own window class,
which isn't a subclass?

And by resources, do you mean a custom control on a dialog resource?

Assuming you do mean a control on a dialog resource...

For a subclassed Windows common control, you use the common control class on the dialog and
subclass it after the dialog is created, which is the only time you can subclass it - when the control actually exists.

For a custom window/control class on a dialog, you can place a "Custom Control" (from the toolbox in the dialog editor)
on the dialog. Then in its properties, set the appropriate values, especially the window class. This window class will need
to be registered when you create the dialog or dialog creation will fail.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

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