c++ _bstr_t instead of use string

Question

I have some code to read file,but it is used std::string, i need to use _bstr_t the code follow can works fine. how to change the type?

   std::ifstream inFile("QdatPassWordconfig.config");
  std::string sPassWord; //(here, i need to use _bstr_t)
  std::string sTemp;
  if (inFile.is_open())
  {
      if(std::getline(inFile,sTemp)) 
      {
            cout<<sTemp<<endl;
            sPassWord=sTemp;
      }
  }

Some programmer dude · Accepted Answer · 2013-02-26T06:22:43.867

3

If you read the _bstr_t documentation, you will see that its assignment operator takes a normal const char *.

So it's probably just to assign to it:

_bstr_t sPassword;

// ...

sPassword = sTemp.c_str();

If you have trouble using normal narrow-character strings, you should convert all your code relating to this to use wide-character string, i.e. the classes with the w prefix:

std::wifstream inFile("QdatPassWordconfig.config");
_bstr_t sPassword;
std::wstring sTemp;

if (inFile.is_open())
{
    if(std::getline(inFile, sTemp)) 
    {
        std::wcout << sTemp << endl;

        sPassword = sTemp.c_str();
    }
}

edited Feb 26 '13 at 06:22

answered Feb 26 '13 at 06:04

Some programmer dude

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if sTemp="123", but only if the sTeml=L"123",then can work fine.how to add "L"? – jack.li Feb 26 '13 at 06:20
@jack.li You might have to use the wide-character functions and classes. – Some programmer dude Feb 26 '13 at 06:23
I am new with c++, so i don't know how to use wide-character to read file or write file? – jack.li Feb 26 '13 at 06:24
see my read and write file with std::string http://stackoverflow.com/questions/15080652/c-get-one-line-data-in-txt-file – jack.li Feb 26 '13 at 06:25
@jack.li Write wide-character strings as well? Or use narrow-character, and convert to wide-character strings when needed. If you wait a little I will _try_ to come up with some code for that. – Some programmer dude Feb 26 '13 at 06:40

c++ _bstr_t instead of use string

1 Answers1