Re: Cstring, string ,and char[]

From:

David Wilkinson <no-reply@effisols.com>

Newsgroups:

microsoft.public.vc.mfc

Date:

Mon, 18 Jun 2007 09:58:51 -0500

Message-ID:

<OJEuBDbsHHA.1168@TK2MSFTNGP02.phx.gbl>

Asm23 wrote:

I have a problems on the file io.
when I use the dilog box to pick a txt file.
code is like below.

CFileDialog dlg(.......);
if(dlg.DoModal() == IDOK)
{ Cstring a;
      a= dlg.GetPathName();
}

the "a" will assigned a filename of the txt file.
a is a Cstring type variable.
but in standard c++ ,I use the

string p;
p=????;//p is the file full path.
inFile.open(p);
if (!inFile)
{
    cout << "Unable to open file";
    return;
}
where p is a standard string class.

My question is How can I traslate among Cstring ,string and char[].

Is there any common methods?
Thank you! everyone who read my post!

To go from CString to std::string you need to go through const char*.
CString has automatic conversion to const char* so you can do:

CString s1 = "I am a CString";
std::string ss1 = s1;

To go the other way you must use the c_str() method:

std::string ss2 = "I am a std::string";
CString s2 = ss2.c_str();

BTW, in Windows programming you should generally code "Unicode aware":

typedef std::basic_string<TCHAR> tstring;

CString s1 = _T("I am a CString");
tstring ss1 = s1;

tstring ss2 = _T("I am a tstring");
CString s2 = ss2.c_str();

--
David Wilkinson
Visual C++ MVP