C / C++ / MFC

Re: DAO vs CFile // Which is faster?

28-Sep-07 0:50

Hi,

What do u think is faster to compare a secuence of BYTES that can has [192, 4096] positions?

My boss did it with two BYTE BufferX[4096], one to hold the actual project code and the other to hold the PLC saved code in order to compare both of them on the fly. And he has said that he wants it to be done in another way because the performance was very slow.

The secuence of bytes has a logical strructure and I have already the code to write it in a file, I write using tokens of different length according to the meaning and the configuration of the actual project. And the Plc should have the same bytes in the same order.

I thought to make it using the functions I already have (and work) to create an "AktualProject.pc" and get the secuence of the PLC and create an "OnlineProject.pc". Then open both of them and compare byte per byte doing an iteration till the end of the files. When a difference come... error.

But a partner has told me it may be faster with DAO. Writing my the actual code to a row (or a column), the online code to another row (or column, I don't know what will be better) and then compare the contents of both using database requests.

What do you think it is better? My boss priority is quickness of the programm, but I have never used DAO before.

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 | ;)

David Crow28-Sep-07 2:29

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

Re: DAO vs CFile // Which is faster?

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.

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

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

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

Russell^'

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

Russell^'

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