Unicode string visual c++ constructor

Question

So, I'm using Visual Studio 2012 with project settings set to "use unicode".

I have this included to my file:

#include <string> using namespace std;

And when i try to do this

 //process.szExeFile - WCHAR[260] //name - PCSTR if (string(process.szExeFile) == string(name))

Visual studio throws an error C2665.

What am I doing wrong?

error C2665: std::basic_string<_Elem,_Traits,_Alloc>::basic_string: none of the 17 overloads can convert parameters — GuyInSombrero
– GuyInSombrero, Commented Mar 7, 2017 at 17:41
@BerNardEr: That's because PCSTR is unrelated to WCHAR[]. You need to understand the difference between 8 and 16 bit characters in Windows. — MSalters
– MSalters, Commented Mar 8, 2017 at 10:46

Community · Accepted Answer · 2017-05-23 12:25:19Z

What am I doing wrong?

When the project is set to "use unicode", the process.szExeFile field is of type WCHAR[]. The std::string class does not provide a constructor which accepts WCHAR[] (or wchar_t*) as input.

You are comparing a name variable as a non-Unicode string, so I assume you don't care about non-ASCII characters. If that is true, you may do this:

std::wstring exeStr(process.szExeFile); std::string exeStrA(exeStr.begin(), exeStr.end()); if (exeStrA == string(name))

If you care about non-ASCII characters, you should do it the other way around, converting your name string to Unicode, for example using wsctombs() (you can find an example here: How do I convert a string to a wstring using the value of the string?).

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