Question

how to write CString to text file?

Asked by: tobal99z

Hope someone can help me!
I'm pulling my hair out (what little I have left!)

How can I write a CString to a text file?

I'm getting some funny numeric output.

ofstream::myfs
myfs.open("xxx");
CString mycs = CString("blahblah")
myfs << mycs;
myfs.close();

Emergency! Help!

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Asked On
2008-08-30 at 12:37:49ID23691378
Tags

C++

,

Visual Studio 2008

Topic

C++ Programming Language

Participating Experts
3
Points
500
Comments
6

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Answers

 

by: jkrPosted on 2008-08-30 at 13:05:21ID: 22353059

The simple soultion would be to access the character buffer directly using 'CString::operator LPCTSTR():

ofstream::myfs
myfs.open("xxx");
CString mycs = CString("blahblah")
myfs << (LPCTSTR) mycs;
myfs.close();

                                              
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by: tobal99zPosted on 2008-08-30 at 13:15:52ID: 22353091

It works if I change the setting:

"Character Set = Not Set"

instead of UNICODE

this makes me nervous. Is this ok? Should I do something else?

Are CString still good to use in C++?

Thanks!

 

by: jkrPosted on 2008-08-30 at 14:13:35ID: 22353248

Well, actually I'd prefer std::string (http://www.sgi.com/tech/stl/basic_string.html) over CString. If you need UNICODE (are you going to support other, e.g. asian languages) you can use the UNICODE versions of these STL streams, e.g.

wofstream::myfs; // "wofstream" instead
myfs.open("xxx");
CString mycs = CString("blahblah")
myfs << (LPCTSTR) mycs;
myfs.close();

                                              
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by: jkrPosted on 2008-08-30 at 14:20:08ID: 22353259

 

by: LordOfPortsPosted on 2008-08-30 at 14:58:48ID: 22353348

Another option you have is to use ofstream to open the file in binary mode, and use ofstream's write method http://www.cplusplus.com/reference/iostream/ostream/write.html

This will work for CString featuring Unicode characters as well.

CString mycs = _T("Hello World");
 
ofstream myfs("C:\\CString_unicode.txt", ofstream::binary);
 
if(myfs.is_open()) {
	myfs.write((char *)mycs.GetBuffer(0), mycs.GetLength() * sizeof(TCHAR));
	myfs.close();
}

                                              
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by: itsmeandnobodyelsePosted on 2008-09-03 at 12:27:13ID: 22380979

>>>> It works if I change the setting: "Character Set = Not Set" instead of UNICODE this makes me nervous. Is this ok?

If you set the MFC project to UNICODE the CString class turns to unicode as well, what means that the LPCTSTR type (what is the pointer type of the internal character array CString returns when using the cast jkr showed you above) actually is a 'const wchar_t *'  where wchar_t is a 'short int', so it is a pointer to a short int. When streaming that to a ofstream, it prints the pointer value (what you called the funny numeric output).

Things get different, when you were using wofstream as jkr showed. Then, with UNICODE set all is fine as the wofstream can handle a 'wchar_t *' type. But actually the code goes wrong again, if you switch back from UNICODE to ANSI.

I personally would recommend to not using CString and STL streaming classes together. There is a CStringFile class which could be used instead of ofstream/wofstream in case you want to use CString. Or - might be better - you would go the way jkr prefers and use STL string classes only. In case you have to convert a CString you would need code like

    CString str("xyz");
    std::string s;
    if (sizeof(TCHAR) == 1)
         s = (const char*)str;
    else
    {
          s = std::string('\0', str.GetLength()+1);
          wcstombs(&s[0], (LPCWSTR)str, s.size());
    }

to convert from either char or wchar_t.
         

20120131-EE-VQP-002

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