Re: How to copy string with NULL - C / C++ / MFC Discussion Boards

Re: How to copy string with NULL

Nemanja Trifunovic1-Jun-06 1:35

Nemanja Trifunovic

1-Jun-06 1:35

Aljechin wrote:
I need to copy a string which may contain NULL characters in between

How about std::copy[^]?

My programming blahblahblah blog. If you ever find anything useful here, please let me know to remove it.

Re: How to copy string with NULL

<color>Aljechin 1-Jun-06 1:47

<color>Aljechin

1-Jun-06 1:47

char szSource[23] = {"Before\0After"};<br />
char szDest[23];<br />
<br />
ptr = memcpy(szDest,szSource,22);<br />
printf("%s %d",szDest,strlen(szDest));

I went through that page, but not getting it. Can you show me a small code snippet of how do i copy that szSource into szDest? Sorry if a very elementary question.

Rose | [Rose]

Re: How to copy string with NULL

Cedric Moonen1-Jun-06 1:58

Cedric Moonen

1-Jun-06 1:58

What are you trying to do exactly ?
Is not because memcpy sucessfully copied the source into the destination that the '\0' character will be removed. It will still be present in the new string so as soon as you try to get its length or print the string, you will only have the begining of the string. This is totally logical.

Cédric Moonen
Software developer

Charting control

Re: How to copy string with NULL

<color>Aljechin 1-Jun-06 2:05

<color>Aljechin

1-Jun-06 2:05

What I am doing? PIP (Peripheral Interface Programming). I have generated a sequence of binary data which will be understood by a peripheral device. For example, we issue a print command from notepad. Its not the .txt file that is sent to the printer by the OS. But a series of printer-understood data is sent. My program generates such device-understandable data which could be just dumped into the port of the device and it will print some meaningful text or act accordingly. I have this binary (kinda junk) stored in unsigned char array. So, I am trying to figure out a way to do this. Smile | :)

Re: How to copy string with NULL

Cedric Moonen1-Jun-06 2:09

Cedric Moonen

1-Jun-06 2:09

So, what is the problem ? Your data is there but if you try to display it with a function that waits for a string, you won't be able to see past the zero char. Just send your buffer and it will work. You need to remember the size of your string of course because strlen won't work.

Cédric Moonen
Software developer

Charting control

Re: How to copy string with NULL

<color>Aljechin 1-Jun-06 20:47

<color>Aljechin

1-Jun-06 20:47

Thank you very much

Re: How to copy string with NULL

Nemanja Trifunovic1-Jun-06 2:26

Nemanja Trifunovic

1-Jun-06 2:26

Aljechin wrote:
char szSource[23] = {"Before\0After"};
char szDest[23];

ptr = memcpy(szDest,szSource,22);
printf("%s %d",szDest,strlen(szDest));

<br />
char szSource[23] = {"Before\0After"};<br />
char szDest[23];<br />
<br />
std::copy(szSource, szSource + 23, szDest);<br />

However, as Cedric already noted, don't expect that printf and strlen show the whole thing if you have embedded zeroes.

My programming blahblahblah blog. If you ever find anything useful here, please let me know to remove it.

Re: How to copy string with NULL

<color>Aljechin 1-Jun-06 20:41

<color>Aljechin

1-Jun-06 20:41

Thank you so much. I will try this.

Rose | [Rose]

Get file size in mega bytes

big_denny_2001-Jun-06 0:27

big_denny_200

1-Jun-06 0:27

Hi all

How can I get file size in mega bytes ?

Is there any good API, for this ?

I have a MFC prpject.

thank you.

Re: Get file size in mega bytes

ThatsAlok1-Jun-06 0:32

ThatsAlok

1-Jun-06 0:32

big_denny_200 wrote:
Hi all

How can I get file size in mega bytes ?

Is there any good API, for this ?

GetFileSizeEx() for reteriving size of File and convert that into MB by divinding it by 1024 *1024

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV
Support CRY- Child Relief and You

Re: Get file size in mega bytes

Hamid_RT1-Jun-06 1:15

Hamid_RT

1-Jun-06 1:15

Hi ThatsAlok,
How are you? Smile | :)

and StrFormatByteSizeA

whitesky

Re: Get file size in mega bytes

ThatsAlok1-Jun-06 1:54

ThatsAlok

1-Jun-06 1:54

WhiteSky wrote:
How are you?

Fine

WhiteSky wrote:
nd StrFormatByteSizeA

Will try!

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV
Support CRY- Child Relief and You

Re: Get file size in mega bytes

ThatsAlok1-Jun-06 1:55

ThatsAlok

1-Jun-06 1:55

WhiteSky wrote:
StrFormatByteSizeA

Thanks for Api!

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV
Support CRY- Child Relief and You

Re: Get file size in mega bytes

Hamid_RT1-Jun-06 2:12

Hamid_RT

1-Jun-06 2:12

yo're welcome Mr Alok Gupta Smile | :)

whitesky

Re: Get file size in mega bytes

ThatsAlok1-Jun-06 2:40

ThatsAlok

1-Jun-06 2:40

WhiteSky wrote:
welcome Mr Alok Gupta

Even Alok will do Smile | :)

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV
Support CRY- Child Relief and You

Re: Get file size in mega bytes

Sarath C1-Jun-06 1:02

Sarath C

1-Jun-06 1:02

open the file using CFile

then call "GetLength"

it will give u size in bytes divide it by (1024*1024) ( im not sure this calculation is correct) Smile | :)

Sa^Rath.

"Don't Do Different things... Do Things Differently..."

Re: Get file size in mega bytes

David Crow1-Jun-06 3:39

David Crow

1-Jun-06 3:39

SaRath C wrote:
open the file using CFile

Not a good idea as Open() is an expensive call, not to mention that it could easily fail if another process has the file open.

"The largest fire starts but with the smallest spark." - David Crow

Re: Get file size in mega bytes

Nibu babu thomas1-Jun-06 1:06

Nibu babu thomas

1-Jun-06 1:06

This[^] will help. Smile | :)

Nibu thomas
A Developer

Programming tips[^] My site[^]

how to use IWebBrowser2::NavigateError?

szcococut31-May-06 23:59

szcococut

31-May-06 23:59

my code:

BEGIN_EVENTSINK_MAP(CBrowserPage, CDialog)
//{{AFX_EVENTSINK_MAP(CBrowserPage)
ON_EVENT(CBrowserPage, IDC_EXPLORER1, 271 , NavigateError, VTS_DISPATCH VTS_PVARIANT VTS_PVARIANT VTS_PVARIANT VTS_PVARIANT VTS_PVARIANT VTS_PBOOL)
ON_EVENT(CBrowserPage, IDC_EXPLORER1, 252 /* NavigateComplete2 */, OnNavigateComplete2Explorer1, VTS_DISPATCH VTS_PVARIANT)
//}}AFX_EVENTSINK_MAP
END_EVENTSINK_MAP()

OnNavigateComplete2Explorer1 can work,
NavigateError can't work,why?
my ie is 6.0
thanks!

Re: how to use IWebBrowser2::NavigateError?

szcococut1-Jun-06 0:33

szcococut

1-Jun-06 0:33

had got it ,
ON_EVENT(CBrowserPage, IDC_EXPLORER1, 271 , NavigateErrorExplorer1,VTS_DISPATCH VTS_PVARIANT VTS_PVARIANT VTS_PVARIANT VTS_PBOOL)

can work
thanks

CString????-newbie

antonaras31-May-06 23:53

antonaras

31-May-06 23:53

Hi again buddies

Can anyone help me with a couple of questions on CString

i'm trying to use it for the first time

CString str("Ma%");//CString' : undeclared identifier(i include string)

also how can i convert a string to CString and vice versa

Thanks a lot

Re: CString????-newbie

toxcct31-May-06 23:56

toxcct

31-May-06 23:56

CString is a MFC (or ATL) class. if you don't have a MFC project, you won't see it.

did you create a console project ?

TOXCCT >>> GEII power

[VisualCalc 3.0 updated ][Flags Beginner's Guide new! ]

Re: CString????-newbie

Sarath C31-May-06 23:57

Sarath C

31-May-06 23:57

U need MFC support for the application.
CString is defined at "Afx.h"

if add support to for MFC, u can simply use the basic mfc classes.

These are the main include files.

#include <afxwin.h> // MFC core and standard components
#include <afxext.h> // MFC extensions

in a normal MFC application, this will be included at "StdAfx.h"

Sa^Rath

"D on't blindly follow rules you read somewhere without verifying that it makes sense for your situation!"

Re: CString????-newbie

Sarath C1-Jun-06 0:01

Sarath C

1-Jun-06 0:01

Converting string to CString

<br />
string stdStr = "Test";<br />
CString strText = stdStr.c_str();<br />

Sa^Rath

"D on't blindly follow rules you read somewhere without verifying that it makes sense for your situation!"

Re: CString????-newbie

antonaras1-Jun-06 0:19

antonaras

1-Jun-06 0:19

Thanks for the reply

Yes i'm doing a console application
SARATH can u pls write again the include files that i need to use
the code was cut off

Thanks again

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