C / C++ / MFC

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

David Crow

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?

"One man's wage rise is another man's price increase." - Harold Wilson

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

"Show me a community that obeys the Ten Commandments and I'll show you a less crowded prison system." - Anonymous

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

David Crow

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

David Crow

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