Re: String to Number - C / C++ / MFC Discussion Boards

Waldermort21-Mar-06 19:48

21-Mar-06 19:48

Ok, I just tested what I thought and I was half right. atoi will stop at the first non-numerical char, so if your string start with letter you have to remove them.

char *txt = "MX2001";
char *buffer = new char[10];
int pos = 0;
int result;
// strip the non-numerical chars
for (int i=0;i<strlen(txt);i++) {
    if ((txt[i] > 0x29)&&(txt[i] < 0x40)) { // if numerical
        buffer[pos] = txt[i];
        pos++;
    }
}
buffer[pos] = 0x00; // add a terminating null
result = atoi(buffer);

Or if your string is fairly constant and always the first two are letter you could

result = atoi(&txt[2]);

-- modified at 1:50 Wednesday 22nd March, 2006

Don't forget to use delete or you will have memory leaks;

Re: String to Number

Aqueel21-Mar-06 19:45

Aqueel

21-Mar-06 19:45

Here is a way to do that.
1. Get length of your CString.
2. Declare a char array of that length and copy your CString to that array.
3. Now the number can easily be extracted from that array.

Here is the code to copy CString to char array

int size = myCString.GetLength();  <br />
   char *array =(char*)malloc(size + 1);<br />
   strcpy(array, myCString);

If problem remains, do let us know.
Good Luck

We Believe in Excellence
www.aqueelmirza.cjb.net

Thanks All Prob Solved

<color>Aljechin 21-Mar-06 20:08

<color>Aljechin

21-Mar-06 20:08

Thank you all. Actually I had been a little dumb. I forgot I was doing a unicode build and should have used _wtoi function and not the atoi function Big Grin | :-D

.

Thanks for all of your kind replies.

Aljechin

Re: Thanks All Prob Solved

Nibu babu thomas21-Mar-06 20:23

Nibu babu thomas

21-Mar-06 20:23

Aljechin should have used _wtoi function and not the atoi function .

Always try to use tchar version of functions. Like _ttoi. This way you don't have to worry whether it's unicode or not.

Nibu thomas
Software Developer

Re: Thanks All Prob Solved

Waldermort21-Mar-06 20:26

Waldermort

21-Mar-06 20:26

Your welcome.

I wish more people would say thankyou after they have been helped and more people to state what they did wrong or how they fixed the problem. The message boards (not only this site) are filled with questions and no answers or gratitude. It makes searching for a solution a hard task.

Re: Thanks All Prob Solved

Aqueel21-Mar-06 21:25

Aqueel

21-Mar-06 21:25

You can always rank helpful replies (bottom right)

We Believe in Excellence
www.aqueelmirza.cjb.net

-- modified at 3:25 Wednesday 22nd March, 2006

Re: String to Number

lawrence200021-Mar-06 22:42

lawrence2000

21-Mar-06 22:42

CString str=_T("MX1200" );
int position;
for(int i=0 , str.length(),i++)
if (str.getat(i) <= '9') and (str.getat(i) >= '0')
{
position =i;
//exit;
}
str =str.left(position);
int yourInteger =atoi(LPCTSTR(str));

Re: String to Number

Hamid_RT21-Mar-06 23:43

Hamid_RT

21-Mar-06 23:43

maybe it is some helpful to you

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vclib/html/_crt_data_conversion.asp[^]

Contents of pch

MFCRookie21-Mar-06 18:57

MFCRookie

21-Mar-06 18:57

Hi All,
I had been trying out different websites/books to find out as to what the precompiled header file actually contains but I haven't found any answer.

If any one out there knows what goes in there and would bother to answer this question, I would be highly obliged. Smile | :)

Re: Contents of pch

Nibu babu thomas21-Mar-06 19:01

Nibu babu thomas

21-Mar-06 19:01

MFCRookie wrote:
If any one out there knows what goes in there and would bother to answer this question, I would be highly obliged.

Well what about stdafx.h.

These files are used to build a precompiled header file Projname.pch and a precompiled types file Stdafx.obj.

These files are located in the Projname directory. In Solution Explorer, Stdafx.h is in the Header Files folder, and Stdafx.cpp is located in the Source Files folder.

stdafx.h
An include file for standard system include files and for project-specific include files that are used frequently but are changed infrequently.

stdafx.cpp
Contains the preprocessor directive #include "stdafx.h" and adds include files for precompiled types. Precompiled files of any type, including header files, support faster compilation times by restricting compilation only to those files that require it. Once your project is built the first time, you will notice much faster build times on subsequent builds because of the presence of the precompiled header files.

Nibu thomas
Software Developer

Re: Contents of pch

MFCRookie21-Mar-06 19:25

MFCRookie

21-Mar-06 19:25

Hi Nibu,
Thanks for your response. I would just like to instantiate on this info that you have provided. Could you please tell me whether my understanding is correct? Sorry to keep bugging you.

Let us assume that there is only one line in stdafx.h and that is #include stdio.h. Now, stdio.h contains a function fopen. Taking fopen just for example. Now, is it true that the pch will contain object code for fopen? If yes, then what will stdafx.obj contain? Will it just be the object version of the line
FILE* fopen(const char* filename, const char* mode)?

Re: Contents of pch

Ștefan-Mihai MOGA21-Mar-06 20:46

Ștefan-Mihai MOGA

21-Mar-06 20:46

I think that stdio.obj will contain the object code for fopen function and your stdafx.obj will contain only a reference to that function, if any. Good coding and good luck! Smile | :)

Re: Contents of pch

Rick York21-Mar-06 21:04

Rick York

21-Mar-06 21:04

The PCH file contains a tokenized representation of the contents of all headers that were processed. This means all prototypes, definitions, declarations, enumerations, and macros. There is no object code in it. You can thing of it as the results of what is typically the first two passes of a compiler - the preprocessor and tokenizer.

Re: Contents of pch

MFCRookie21-Mar-06 21:16

MFCRookie

21-Mar-06 21:16

Hi Rick,
Thanks a lot. Looks like this is what I was looking out for.

Thanks once again. Rose | [Rose]

Difference...

HakunaMatada21-Mar-06 18:39

HakunaMatada

21-Mar-06 18:39

What is the difference between the two below

if( NULL != lpDispatch )

and

if( lpDispatch != NULL )

where LPDISPATCH lpDispatch ;

Thanks.. Smile | :)

---
With best regards,
A Manchester United Fan

The Genius of a true fool is that he can mess up a foolproof plan!

Re: Difference...

Nibu babu thomas21-Mar-06 18:45

Nibu babu thomas

21-Mar-06 18:45

Save My Soul - (SMS) wrote:
What is the difference between the two below

if( NULL != lpDispatch )

and

if( lpDispatch != NULL )

where LPDISPATCH lpDispatch ;

Thanks..

To avoid making the following mistake...

if(lpDispath = NULL)
   ;//this will never execute

But if we use

if(NULL = lpDispath)
   ;//compiler will give an error, like assigning to constant.

This is one of a kind of silly but serious bugs. It becomes difficult to trace them. So programmers play safe with this kind of coding. Helps but not always.

Nibu thomas
Software Developer

Re: Difference...

Aqueel21-Mar-06 18:49

Aqueel

21-Mar-06 18:49

No difference in turms of result they both produce. In both cases NULL and IpDispatch are being compared with each other.

We Believe in Excellence
www.aqueelmirza.cjb.net

Re: Difference...

Waldermort21-Mar-06 19:56

Waldermort

21-Mar-06 19:56

It's handy to use NULL first sometimes. If you have a fairly long if statement, maybe you are checking the return value of a dialog, sometimes the line will scroll of your page. If you had the NULL at the end, it would be out of view, whereas having it first it is in view.

It simply makes scrolling through your code a little easier.

MFC/C++ control in a dll

MrNed21-Mar-06 18:30

MrNed

21-Mar-06 18:30

I have a (hopefully) simple problem. I want to create a custom control in C++, with or without MFC, that i can compile into a dll and use that control elsewhere eg other MFC apps and a .NET app. Whats the easiest way to do this?

Re: MFC/C++ control in a dll

Nibu babu thomas21-Mar-06 19:18

Nibu babu thomas

21-Mar-06 19:18

MrNed wrote:
Whats the easiest way to do this?

By Creating an MFC Extension Dll.

Nibu thomas
Software Developer

Re: MFC/C++ control in a dll

MrNed21-Mar-06 23:38

MrNed

21-Mar-06 23:38

But that project creates a CWinApp class. How do I say create a CButton derived class and use that as the custom control elsewhere?

Retrieve MSDN favourites

Anilkumar K V21-Mar-06 17:58

Anilkumar K V

21-Mar-06 17:58

Is there any way to get the list of favourites items we added to MSDN library installed in System?
(Like storing the book mark in IE?).

This will be useful when we format/reinstall OS

Re: Retrieve MSDN favourites

Ștefan-Mihai MOGA21-Mar-06 20:41

Ștefan-Mihai MOGA

21-Mar-06 20:41

Well, I saw that the list of favourites from MSDN and the one from IE are the same. Do you have separate lists? Thanks in advance for your answer.

Re: Retrieve MSDN favourites

Anilkumar K V5-Apr-06 21:55

Anilkumar K V

5-Apr-06 21:55

what i was asked abt to store MSDN( installed on PC) favaourite

IE uses different list!!!

Group box text

Anil_vvs21-Mar-06 17:42

Anil_vvs

21-Mar-06 17:42

Hi All,

Can anyone tell me how to set group box text at runtime?

Thanks and Regards,
Anil

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