Как работать с PathCombine ?

#include <windows.h>
#include <Shlwapi.h>

TCHAR myPath[MAX_PATH];
GetTempPath(MAX_PATH, myPath);

const std::string fname = "MyDirectory"; // Если правильно

BOOL DirectoryExists(LPCTSTR szPath)
{
    DWORD dwAttrib = GetFileAttributes(szPath);
 
    return (dwAttrib != INVALID_FILE_ATTRIBUTES && (dwAttrib & FILE_ATTRIBUTE_DIRECTORY));
}
void createDirectoryRecursively(std::wstring path)
{
    unsigned int pos = 0;
    do
    {
        pos = path.find_first_of(L"\\/", pos + 1);
        CreateDirectory(path.substr(0, pos).c_str(), NULL);
    } while (pos != std::string::npos);
}

std::wstring directory = PathCombine(NULL, myPath, fname); // ошибка в fname: 
if (DirectoryExists(directory.c_str()) == FALSE)
createDirectoryRecursively(directory);

std::wstring directory = PathCombine(NULL, myPath, fname); // ошибка в fname:

const std::wstring fname = L"MyDirectory";
std::wstring directory = PathCombine(NULL, myPath, fname.c_str());

const std::wstring fname = L"MyDirectory";

std::wstring directory = PathCombine(NULL, myPath, fname.c_str());

#include "Shlwapi.h"

std::wstring directory = std::wstring(myPath) + fname;

std::wstring directory = PathCombine(NULL,myPath, TEXT("MyDirectory"));