C / C++ / MFC

Error happen when open file while migrate VC++ 6 to VS2008

20-Jul-12 2:29

TopCoder23 wrote:
char strchr[32] = "the quick fox";

I would consider a different variable name as strchr is the name of a CRT function.

TopCoder23 wrote:
if((strchr[i] >= 97) && (strchr[i] <= 122))

What about:

if (islower(strchr[i]))
    strchr[i] = toupper(strchr[i]);

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Re: c++ code

Software_Developer20-Jul-12 3:30

Software_Developer

20-Jul-12 3:30

You're right about strchr() . and islower(). http://www.cplusplus.com/reference/clibrary/cstring/strchr/[^]

Andraw11118-Jul-12 9:16

Re: Error happen when open file while migrate VC++ 6 to VS2008

18-Jul-12 9:16

Hi,dear all,

I have a project created using C++ 6.0. Now I need to update it to VS2008, now I have a problem when I try to open a file.

In C++ 6.0
#include <fstream.h>
ifstream INPFile(INPFileName, ios::nocreate);

In VS2008

#include <fstream>
ifstream INPFile(INPFileName, ios::nocreate);

the second line get the following error:
Error 23 error C2039: 'nocreate' : is not a member of 'std::basic_ios<_Elem,_Traits>'

Error 24 error C2065: 'nocreate' : undeclared identifier

If I change the second line to the following:

ifstream INPFile(INPFileName)

then get new error as following
error 2248: 'std::basic_ios<_Elem,_Traits>::basic_ios' : cannot access private member declared in class 'std::basic_ios<_Elem,_Traits>'

How can I solve this issue?

Thanks!

Albert Holguin18-Jul-12 9:47

Albert Holguin

18-Jul-12 9:47

This talks about the reason for the first error:
http://www.devx.com/tips/Tip/14544[^]

After your change however, the error about the private member doesn't make sense, you probably need to show a bit more of your code.

Re: Error happen when open file while migrate VC++ 6 to VS2008

Andraw11118-Jul-12 10:01

Re: Error happen when open file while migrate VC++ 6 to VS2008

18-Jul-12 10:01

Albert, thanks for your quick reply.

My project has around 50 files, I already search all header files to check if any function pass fstream as argument, and modify them all to be passed as reference instead of as object.

I don't understand why if I use following code:

ifstream fin(OutputF, ios::in,ios::nocreate);

I got error like "C2039: 'nocreate' : is not...", but if I modify it to:
ifstream fin(OutputF, ios::in,ios::_Nocreate);
I got other kind of error messge:
"error C2248: 'std::basic_ios<_Elem,_Traits>::basic_ios' : cannot access private.."

Thanks!

Albert Holguin18-Jul-12 11:35

Albert Holguin

18-Jul-12 11:35

Wait, if you're doing an ifstream (input), why are you specifiying "no create" at all? That doesn't make sense, it's not going to get created if it can't find it. That's only even applicable at all if you're opening in read/write or write modes.

Re: Error happen when open file while migrate VC++ 6 to VS2008

Richard MacCutchan18-Jul-12 21:59

Richard MacCutchan

18-Jul-12 21:59

I do not think the nocreate option exists anymore, and it should not be necessary on an input stream. You need to use the latest definitions as described here[^].

One of these days I'm going to think of a really clever signature.

Re: Error happen when open file while migrate VC++ 6 to VS2008

Andraw11119-Jul-12 3:29

Re: Error happen when open file while migrate VC++ 6 to VS2008

19-Jul-12 3:29

Thanks, Albert and Richard,

Both of you are right, yes, there is no nocreate.

I solve it by remove it, but the main reason I got the " cannot access private member ..." error is that I have some functions that pass ifstream object as value, they should be passed by reference.

Thanks again!

Andraw11119-Jul-12 5:40

Re: Error happen when open file while migrate VC++ 6 to VS2008

19-Jul-12 5:40

Hi,

I solve my issue posted yesterday, but today has another problem related to it.

When I migrate another small project from C++ to VS2008, I double check all the function delcaration to make sure fstream object is passed by reference or pointer, but when I compile program, I still got two error messages, they are same and the only two errors.

C2248: 'std::basic_ios<_Elem,_Traits>::basic_ios' : cannot access private member declared in class 'std::basic_ios<_Elem,_Traits>'

In this case how should I find where the error come from?

Andraw11119-Jul-12 6:17

Re: Error happen when open file while migrate VC++ 6 to VS2008

19-Jul-12 6:17

I found some functions that pass std::istream or std::istrstream by value, not by reference, is that the reason to cause the problem?

Andraw11119-Jul-12 6:25

Re: Error happen when open file while migrate VC++ 6 to VS2008

19-Jul-12 6:25

Yes, they also need to be passed by reference, now can be compile now.

jschell20-Jul-12 7:15

jschell

20-Jul-12 7:15

I would suppose that passing the fstream by value in 6.0 was wrong too. It might have worked but only by luck.

A fstream is a representation of a computer resource. Passing by value implicitly duplicates the representation without duplicating the actual resource. Thus it represents a broken design/implementation.

search for a word in a text file

byank18-Jul-12 2:14

18-Jul-12 2:14

PLease show me how to search for a word in a text file using a listbox, String objects and Indexof, after i opened it in a richtextbox ,in visual C++, please help!!

David Crow18-Jul-12 2:18

18-Jul-12 2:18

byank wrote:
PLease show me how to search for a word in a text file using a listbox...

What does a listbox have to do with searching a file?

Are you using MFC or Win32?

byank19-Jul-12 11:00

19-Jul-12 11:00

it's just that i've seen here on codeproject the code for searching words in a text files using vb, i think. I need it in c++. thanks

David Crow20-Jul-12 2:24

20-Jul-12 2:24

I understand that, but what does a listbox have to do with anything? It just seems to be "noise" in the overall problem.

Have you tried:

open the file
while not EOF
    read line from file
    if line contains text, exit loop
end
close file

The details deopend on whether you are using MFC, STL, Win32, or some combination thereof.

Shaunak De20-Jul-12 3:17

Shaunak De

20-Jul-12 3:17

If you are searching for a string in a text file do this:

C++

 CString oneLine;     //initialize a CString 
 bool flag = FALSE;   //flag for result
 CStdioFile  fS (_path_, CFile::modeRead ); //open the file
 int lineNumber = 0;   //hold the line number
 while( fS.readLine(oneLine))  //readLine returns false if EOF
  {
    if( oneLine.Find(L"String")!= -1 )  //Find returns -1 if no match
    { flag = TRUE; break; }
   lineNumber++;   //iterate lineNumber
  }
//lineNumber will hold the line in which the string was found. To get exact character place store what Find returns somewhere.

See also:
Find
CStdioFile

David Crow20-Jul-12 4:51

20-Jul-12 4:51

Shaunak De wrote:
If you are searching for a string in a text file...

Which I'm not, but thanks anyway, though. Wink | ;)

byank20-Jul-12 7:28

20-Jul-12 7:28

tahnks for your help ...i need this code in visual c++ and i use visual c++ 2008/2010. could you help me with this? I place the word that i want to search in a textbox and after i click on a button(search) i want to see where the word is. The file is loaded in a richtextbox . thanks a lot

Software_Developer18-Jul-12 3:40

Software_Developer

18-Jul-12 3:40

C++.NET [here] and [here] .

byank19-Jul-12 11:05