Converting char to wchar_t - c++

Question

I'm trying to modify this function https://stackoverflow.com/a/35658917/19324589
from CStringA (i have no idea what data type is it) to std::wstring
char buf[1024] to wstring buf
'original' function:
char buf[1024];
DWORD dwRead = 0;
DWORD dwAvail = 0;
if (!::PeekNamedPipe(hPipeRead, NULL, 0, NULL, &dwAvail, NULL))
break;
if (!dwAvail) // No data available, return
break;
if (!::ReadFile(hPipeRead, buf, min(sizeof(buf) - 1, dwAvail), &dwRead, NULL) || !dwRead)
// Error, the child process might ended
break;
buf[dwRead] = 0;
strResult += buf;
my attempt:
when i modify buf from char to wstring, it stores only garbage after the ReadFile line.
std::wstring strResult;
// ...
std::wstring buf(1024, '\0');
DWORD dwRead = 0;
DWORD dwAvail = 0;
if (!::PeekNamedPipe(hPipeRead, NULL, 0, NULL, &dwAvail, NULL))
break;
if (!dwAvail) // No data available, return
break;
if (!::ReadFile(hPipeRead, buf.data(), min((buf.size() * sizeof(wchar_t)), dwAvail), &dwRead, NULL) || !dwRead)
// Error, the child process might ended
break;
strResult += buf;
I end up doing:
bool bProcessEnded = false;
std::string result;
for (; !bProcessEnded;)
{
// Give some timeslice (50 ms), so we won't waste 100% CPU.
bProcessEnded = WaitForSingleObject(pi.hProcess, 50) == WAIT_OBJECT_0;
// Even if process exited - we continue reading, if
// there is some data available over pipe.
for (;;)
{
char buf[1024];
DWORD dwRead = 0;
DWORD dwAvail = 0;
if (!::PeekNamedPipe(hPipeRead, NULL, 0, NULL, &dwAvail, NULL))
break;
if (!dwAvail) // No data available, return
break;
if (!::ReadFile(hPipeRead, buf, min((sizeof(buf) - 1), dwAvail), &dwRead, NULL) || !dwRead)
// Error, the child process might ended
break;
buf[dwRead] = 0;
result += buf;
}
} //for
CloseHandle(hPipeWrite);
CloseHandle(hPipeRead);
CloseHandle(pi.hProcess);
CloseHandle(pi.hThread);
return to_wstring(result);
In my use case buf is returning a data like already connected to 127.0.0.1:5555
I would like to understand what i'm doing wrong?