C / C++ / MFC

Re: Reading from a text file using MFC

13-Dec-07 0:42

CStdioFile::ReadString
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.

Johpoke13-Dec-07 0:53

Johpoke

13-Dec-07 0:53

http://www.codeproject.com/file/importstringvalues.asp[^]

//Johannes

Re: Reading from a text file using MFC

Derick Magagula13-Dec-07 1:24

Derick Magagula

13-Dec-07 1:24

Thanks Johpoke it worked, and thanks to the other guys too for their responses. Laugh | :laugh:

conversion from hex to Readable format

Chandrasekharan P12-Dec-07 23:43

Chandrasekharan P

12-Dec-07 23:43

i have a file which contains hex values. i want to convert that to human readable form. please give me some leads.

rajneshmalik13-Dec-07 0:09

rajneshmalik

13-Dec-07 0:09

try itoa function for more help LOOK MSDN

CPallini13-Dec-07 0:33

13-Dec-07 0:33

Chandrasekharanp wrote:
i have a file which contains hex values. i want to convert that to human readable form. please give me some leads

hex format is human readable. Do you mean a binary file (as opposite to text one)?

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.

Chandrasekharan P13-Dec-07 0:35

Chandrasekharan P

13-Dec-07 0:35

ya right... i am sorry for the wrong query.. i need to read it from a file and convert that to ascii and then print it to another file.

CPallini13-Dec-07 0:58

13-Dec-07 0:58

Oh,that's not difficult, for instance:
Supposing ANSI build and error handling left to the reader

FILE * fpin = fopen("MyBinaryFile.foo","rb");
FILE * fpout = fopen("MytextFile.txt","w");
int c;
int count = 0;
while ( (c=getc(fpin)) != EOF )
{
  fprintf(fpout, "%02x ", c);
  if (count % 16 == 15)   fprintf(fpout, "\n");
  count++;
}
fclose(fpin);
fclose(fpout);

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.

Chandrasekharan P13-Dec-07 1:22

Chandrasekharan P

13-Dec-07 1:22

thanks GURU!!!!!!

You're welcome

CPallini13-Dec-07 1:55

13-Dec-07 1:55

Chandrasekharanp wrote:
thanks GURU!!!!!!

Oh, I'm not.

Anyway, you're welcome.
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.

Convert char* to CString

rajanponnalagu12-Dec-07 23:39

rajanponnalagu

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.

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)

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.

CPallini13-Dec-07 0:11

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.

CPallini13-Dec-07 0:29

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.