C / C++ / MFC

Re: DAO vs CFile // Which is faster?

28-Sep-07 2:29

Nelek wrote:
What do you think it is better?

It matters not what we think. What matters is the empirical data that you gather to appease them both. You can't use here-say when comparing metrics. Code up both ways so that you can confidently say which way performs better.

"A good athlete is the result of a good and worthy opponent." - David Crow

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

Nelek28-Sep-07 2:42

Nelek

28-Sep-07 2:42

The problem is that I don't know about DAO. Sigh | :sigh:

Because of that I have asked.

If DAO is faster then I will learn and try it, if more or less are the same, I can use what I already know and don't delay it more than strictly needed.

Anyways thanks for answering.

Greetings.

--------
M.D.V.

If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?

Help me to understand what I'm saying, and I'll explain it better to you

Wink | ;)

Re: DAO vs CFile // Which is faster?

David Crow28-Sep-07 2:46

28-Sep-07 2:46

Nelek wrote:
If DAO is faster...

Whether it is or isn't, you won't actually know until you code something up to test with. DAO may be faster in scenario A, but slower in scenario B.

"A good athlete is the result of a good and worthy opponent." - David Crow

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

Dll creation problem

Karismatic28-Sep-07 0:26

Karismatic

28-Sep-07 0:26

Hey guys,

Can anybody tell me how to create a dll that ca be successfully fully loaded in some other language like vb and can be used there.

Regards,
Pankaj Sachdeva

"There is no future lies in any job"
"but"
"future lies in the person who holds the job"

Nelek28-Sep-07 0:30

Nelek

28-Sep-07 0:30

I have no idea (yet), I need to learn about DLLs too, So I was looking in the DLL section here in codeproject.

I think This link[^] and the other 3 articles of the same group can help you.

Is about writing a C++ from VC++ and VB. It has information about compatibilities and so on. Maybe is not what you exactly look for, but it has lot of comments/points tht will help you.

Karismatic28-Sep-07 0:40

Karismatic

28-Sep-07 0:40

Have you tried to make a atl com dll
i have tried by i am unable to use it successfully
like some of the functions are working and some other are not do you have any idea

Regards,
Pankaj Sachdeva

"There is no future lies in any job"
"but"
"future lies in the person who holds the job"

Nelek28-Sep-07 0:51

Nelek

28-Sep-07 0:51

no sorry, you are in a more advanced position as me at the moment

Sachinpatole28-Sep-07 1:27

Sachinpatole

28-Sep-07 1:27

u will have to use "_stdcall" calling convention while exporting the function from DLL.

Enable Spinbutton ctrl

rajaratk27-Sep-07 23:51

rajaratk

27-Sep-07 23:51

Hello,

In our application,there is one spinbuttoncntrl is used to increase or decrease the values. When I open the application, i can able to increase and decrease the value depending upon the default values like if default value is 8, i can able to increase from 3 to 5, 4 to 7 .

But when I close and open the application the spinbuttoncntrl is disabled. Please assist me how to solve this.

Thanks in advance
Ratheesh

Russell^'28-Sep-07 0:29

28-Sep-07 0:29

I don't know if I understand everything, but your seems a problem related to a bad initialization of that control.

Enable it in the VS IDE or programmatically using CWnd::EnableWindow() or CWnd::ShowWindow(SW_SHOW)
Confused | :confused:

Russell

rajaratk28-Sep-07 1:53

rajaratk

28-Sep-07 1:53

Thanks for your response. In a property sheet contains 5 tabs. First tab is General, this tab has the spinbuttoncntrl. When I open the application at firsttime, it enables and can able to increase and decrease the values.

But if i close the application and open it again, it shown as disabled.

Note: The 2nd tab also contains 5 spinbuttoncontrols, there i made some changes like increase and decrease also it enabled all the times. How?

Please assist me to resolve this issue.

David Crow28-Sep-07 2:32

28-Sep-07 2:32

rajaratk wrote:
When I open the application at firsttime, it enables and can able to increase and decrease the values.

But if i close the application and open it again, it shown as disabled.

This makes no sense. Why should one "open" be different than any other "open?" What are you doing when the application is opened? When that tab is activated?

"A good athlete is the result of a good and worthy opponent." - David Crow

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

Iain Clarke, Warrior Programmer

Iain Clarke, Warrior Programmer28-Sep-07 4:03

28-Sep-07 4:03

As David says, this makes no sense on its own.

Are you confusing Close / Open with Minimise / Maximise?

If not, then some action in your code is doing different things. Do you save values? Do a search in your code for the control ID of the spinbutton and see what you do with it.

Unless someone (ie, YOU) disables the control, it will be at whatever state it is set to be in the dialog resource. You need to track down where you disable it, and see why that is different in the two scenarios.

Iain.

How to convert a CString to WCHAR?

TooShy2Talk27-Sep-07 23:42

TooShy2Talk

27-Sep-07 23:42

Hello guyz,

I want to convert a CString to WCHAR but I don't know how to.
Can anybody help me with this?
Any comment will be much appreciated.
Thank you.

Naveen27-Sep-07 23:56

Naveen

27-Sep-07 23:56

TooShy2Talk wrote:
I want to convert a CString to WCHAR but I don't know how to.

It depends on whether you have defined _UNICODE in your application or not. i.e if _UNICODE is define, the CString internally keeps a wchar* itself. so you can simply copy from cstring to wchar_t[] usinf wcscpy() fucntion. If _UNICODE is not define, CString will be internally keeping a char* pointer and you have to covert this char* to wchar_t[] using MultiByteToWideChar() API.

nave

[OpenedFileFinder]

Russell^'28-Sep-07 0:19

28-Sep-07 0:19

CString -> CStringW ?

Russell

David Crow28-Sep-07 2:34

28-Sep-07 2:34

If Unicode is not defined, check out the A2W() macro. If Unicode is defined, you can simply use _tcscpy().

"A good athlete is the result of a good and worthy opponent." - David Crow

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

Notification no action has been taken on a website for toolbar

codeII28-Sep-07 2:54

codeII

28-Sep-07 2:54

Sindse ATL 7.0 and MFC 7.0
You can use CStringW (or CStringA )

This code is valid for both Unicode and Multibyte:

CString cMyCString("Test");
CStringW cMyCStringW( cMyCString );
(LPCWSTR) cMyCStringW;

Dhiraj kumar Saini27-Sep-07 23:31

Dhiraj kumar Saini

27-Sep-07 23:31

I am making a toolbar for a website. initially the toolbar is normal and when the user login the toolbar changes and takes the setting for the logged in user as is in the case of Yahoo.
If the user does not work on the website for 18 minutes i.e. if he takes no action he should be logged out and the toolbar should be in its initial state.
Now the problem for me is I am not able to track that no action has been taken on the website and the session of 18 minutes has expired and because of which I am not able to change my toolbar as a aresult of which what happens is that even if the user is logged out of the site after 18 minutes still my toolbar is having the settings for the logged in user.

I am using WIN32 ATL and WTL.

Please help me what to do.

Thanks in Advance.

Dhiraj Kumar Saini

Re: Notification no action has been taken on a website for toolbar

Iain Clarke, Warrior Programmer28-Sep-07 4:05

Iain Clarke, Warrior Programmer

28-Sep-07 4:05

I think this question would be better asked in a different forum, as it's not really a C++ coding issue - more of a html / webserver question.

Asking over in the Web Development forum would get people who know more than me looking at it!

Iain.

compare vc++ to matlab?

srvsah27-Sep-07 23:31

srvsah

27-Sep-07 23:31

I have worked in both matlab & VC++ , the same pgm takes so much time when it runs in matlab than in VC++. one of my pgm runs 8 hours in matlab but just 6 mints in VC++.... y is it so??

Russell^'27-Sep-07 23:47

27-Sep-07 23:47

Matlab is not an high performance software, it is build to be easy to be used, C++ is optimized during compiling.

If you want to run faster a Matlab routine you can try to write the code in a more optimized way (es. do not use 'for' loop when it is possible, but use matrix aritmetric like addictions or multiplications), then you can also try to compile it in a mex file.

But C++ will be always the fastest.
Smile | :)

Russell

srvsah27-Sep-07 23:53

srvsah

27-Sep-07 23:53

y it is so ? ya i have used matriz form . i wanna know exactly y matlab takes much complie time than VC++..??

Russell^'28-Sep-07 0:15

28-Sep-07 0:15

not compile time...but execution time.
there aren't special rules...the only way is try to mesure the execution time (use tic; toc; on matlab)to find what function is slower.
But the general tip is do not use the keyword for , while , if when possible.
Wink | ;)

Russell