C / C++ / MFC Discussion Boards

rajanponnalagu12-Dec-07 23:39

12-Dec-07 23:39

Hello,

I have one structure contains char * variable. I want to store the CString data to char* variable.

struct _iobuf {
char *_ptr;
int _cnt;
char *_base;
int _flag;
int _file;
int _charbuf;
int _bufsiz;
char *_tmpfname;
};

I have one CString variable like m_Username. I want to store m_Username to char *_base.

Could you please help me how to do.

Re: Convert char* to CString

Sunil Shindekar12-Dec-07 23:51

Sunil Shindekar

12-Dec-07 23:51

_base = m_userName.GetBuffer

or
_base = new char[]
strcpy(_base, m_userName.getbuffer)

Re: Convert char* to CString

rajanponnalagu13-Dec-07 0:08

rajanponnalagu

13-Dec-07 0:08

struct _iobuf {
char *_ptr;
int _cnt;
char *_base;
int _flag;
int _file;
int _charbuf;
int _bufsiz;
char *_tmpfname;
};
typedef struct _iobuf FILE;

FILE *fleCredentials;

fleCredentials = fopen("credentials.crd", "a+");
fprintf(fleCredentials, "%s ",(LPCTSTR)m_Username );

Problem:
========
Only one character of "m_Username" has to be stored in the "credentials.crd". I would like to store the fullname into the file.

Help to proceed further.

Re: Convert char* to CString

CPallini13-Dec-07 0:11

CPallini

13-Dec-07 0:11

Sunil Shindekar wrote:
_base = m_userName.GetBuffer

The above is a mistake, because, unless you want to lock the CString internal buffer forever, then you have to call ReleaseBuffer method, afterwards the _base pointer becomes garbage, please read documentation http://msdn2.microsoft.com/en-us/library/kt26tkzx(VS.71).aspx[^].

Sunil Shindekar wrote:
_base = new char[]
strcpy(_base, m_userName.getbuffer)

Better, but still mistakes. You don't need at all GetBuffer, to do this (and you aren't calling ReleaseBuffer afterwards), the LPCTSTR cast operator is enough.
Furthermore you don't specify character array size.
And, finally, you're supposing that it is an ANSI build.

Is It enough?

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.

Re: Convert char* to CString

CPallini13-Dec-07 0:29

CPallini

13-Dec-07 0:29

Provided it is an ANSI (not UNICODE build, you can
do:

CString strFoo("foo");
struct _iobuf iobuf;

iobuf._ptr = new[strFoo.GetLenght()+1];
if (iobuf._ptr)
{
 strcpy(iobuf._ptr, strFoo);
}
...
...

// don't forget to delete the buffer
if (iobuf._ptr)
{
  delete [] iobuf._ptr;
}

However, I suggest, if you can, to refactor a bit you project (i.e. avoiding such a mixing of string classes and character arrays.

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.

Re: Convert char* to CString

KarstenK13-Dec-07 2:20

KarstenK

13-Dec-07 2:20

I think it is an interface so he had to do such crappy things. But interface should have the buffer, because it wants the data, and knows when to release the memory to avoid leaks. Unsure | :~

Greetings from Germany

Temp folder path

neha.agarwal2712-Dec-07 23:11

neha.agarwal27

12-Dec-07 23:11

Hi all,

Can anybody tell me how can i get temp folder path.

Thanks in advance

Re: Temp folder path

toxcct12-Dec-07 23:24

toxcct

12-Dec-07 23:24

SHGetSpecialFolder()

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Re: Temp folder path

ThatsAlok12-Dec-07 23:36

ThatsAlok

12-Dec-07 23:36

neha.agarwal27 wrote:
Can anybody tell me how can i get temp folder path

GetTempPath

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Re: Temp folder path

Johpoke13-Dec-07 0:55

Johpoke

13-Dec-07 0:55

Or,

getenv("TEMP");

(type set in cmd for more vars)

//Johannes

How to get text from a text box control pertaining to cursor position

AmarjeetSinghMatharu12-Dec-07 22:52

AmarjeetSinghMatharu

12-Dec-07 22:52

Hello All,
I am changing the cursor position for inserting,updating and deleting the text in a text box control.
I am able to get the cursor position pertaining to the current cursor location though.

Please suggest me the way to find the text pertaining to the cursor.

Thanks and Regards.
Amar.

Re: How to get text from a text box control pertaining to cursor position

Nelek13-Dec-07 0:46

Nelek

13-Dec-07 0:46

From VC++ Help:

<br />
CEditView::GetSelectedText <br />
void GetSelectedText( CString& strResult ) const;<br />
<br />
Parameters<br />
strResult: A reference to the CString object that is to receive the selected text.<br />
<br />
Remarks<br />
Call GetSelectedText to copy the selected text into a CString object, up to the end of the selection or the character preceding the first carriage-return character in the selection.<br />

A tip... Try checking the help. Go to index view, write the name of the control and at the bottom of the help text usually is "CLASS MEMBERS" link. With all the possible things you can do by default with that control/class.

Greetings.
--------
M.D.V. Wink | ;)

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
“The First Rule of Program Optimization: Don't do it. The Second Rule of Program Optimization (for experts only!): Don't do it yet.” - Michael A. Jackson

Bad handshake in machine<-->PC communication

__yash__12-Dec-07 21:49

__yash__

12-Dec-07 21:49

Friends,
I wanted to know your suggestions on the following:
There is an MFC application with TCP/IP connections(CAsyncSocket) to connect to machines that send out a string when the user presses a button there.
Now what do you think is the probablity(Yes/No/%) that the string is not received by the software when they are connected on LAN??
Or
Is it that there is absolutely no chance of missing(I dont think so though)

Assumptions:
Physical connections, cabling are proper and never break.

Re: Bad handshake in machine<-->PC communication

David Crow13-Dec-07 4:23

David Crow

13-Dec-07 4:23

yashveer wrote:
Now what do you think is the probablity(Yes/No/%) that the string is not received by the software when they are connected on LAN??

The target machine will either receive the data or it won't.

yashveer wrote:
Is it that there is absolutely no chance of missing(I dont think so though)

There's always the possibility that the target machine could not receive the data.

"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

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Difference in OS

Chandrasekharan P12-Dec-07 21:22

Chandrasekharan P

12-Dec-07 21:22

is there any diffrence working on windows 2000 and windows NT.

Re: Difference in OS

CPallini12-Dec-07 21:49

CPallini

12-Dec-07 21:49

There are differences of course.
But for instance, there are more differences between Windows 2000 and Linux (i.e. IMHO you have to reformulate a bit your rather vague question).
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.

Re: Difference in OS

Chandrasekharan P12-Dec-07 22:00

Chandrasekharan P

12-Dec-07 22:00

ya i am aware of ht differences between Linux and windows 2000

i am working on Visual Studio 6.0. now i want to know what differnce does it make working on 2000 and NT. i hope u got the question.
and what is this IMHO?

Re: Difference in OS

CPallini12-Dec-07 22:08

CPallini

12-Dec-07 22:08

Well, usually, unless you're doing low level stuff, the differences are not so important. Anyway, for instance, compatibility of Win32 API is well documented for every function (under Requirements section).

Chandrasekharanp wrote:
and what is this IMHO

it stands for "In My Honest Opinion", internet slang, see [^]
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.

Re: Difference in OS

Chandrasekharan P12-Dec-07 22:16

Chandrasekharan P

12-Dec-07 22:16

thanks a lot for ur response.. and thanks for the slang... Blush | :O

You're welcome

CPallini12-Dec-07 22:25

CPallini

12-Dec-07 22:25

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.

Deny "Create File" Permission to a User

narayanagvs12-Dec-07 20:10

narayanagvs

12-Dec-07 20:10

Hi,

I am the administrator for my system.I have created a user.
What I need is , Can I deny the user from creating files and folders in my system?

If so, how can that be done programmatically?

Any suggestions would be appreciated.

Thanks
Satya

Today is a gift, that's why it is called the present.

Re: Deny "Create File" Permission to a User

Don Box12-Dec-07 21:40

Don Box

12-Dec-07 21:40

U'll need to add ACE. But it works in NTFS file system.

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template function v.s. template class [modified]

George_George12-Dec-07 19:43

George_George

12-Dec-07 19:43

Hello everyone,

I am feeling template function is more tricky than template class. For the reason that the compiler will do the matching automatically for template function, but for template class, developer can assign how to match.

Sometimes compiler is doing mysterious matching rules for template function, which makes us confused. Does anyone have the same senses?

Example,

1. for template function

we define

template <class T> void sort ( vector <T>& )

when we invoke like,

sort ( vector<int> )&, T will automatically matched by compiler to int -- we have no control. Sometimes, how compiler will do the matching is mysterious.

2. for template class

developer has full control. For example, when use some template class, developer can assign the type of parameter,

we define,

template <class T> class Foo
{
    // ...
}

when developer use it, we can explicitly assign the type, like Foo <int> or Foo <bool>.

Any comments or experiences or even disagreement is welcome.

thanks in advance,
George

modified on Thursday, December 13, 2007 2:19:41 AM

Re: template function v.s. template class

Nelek12-Dec-07 21:06

Nelek

12-Dec-07 21:06

George_George wrote:
when we invoke like,

sort ( vector < int > )&, T will automatically matched by compiler to int

And.... where is the problem? You are giving a < int > what do you expect? To have a double?

I dont really understand where the problem is..

George_George wrote:
when use some template class, developer can assign the type of parameter,

And you can do a conversion of type in the first lines of the function as well, don't you?

Greetings.
--------
M.D.V. Wink | ;)

Re: template function v.s. template class

George_George12-Dec-07 21:47

George_George

12-Dec-07 21:47

Sorry Nelek,

I have not made myself fully understood. My question is (after reorganization),

1. for template function, we can choose to use either implicit mode to let compiler deduce or explicit mode to assign type;

2. for template class, we have to use explicit mode to assign type?

regards,
George

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