cmd.exe immediately closes after calling with CreateProcess

I am trying to execute a batch file using CreateProcess function, but the cmd.exe immediately closes without opening the executing the batch file.

An argument (path of a directory) is also passed.

The c++ code is :

int main()
{
    std::wstring cmdPath;
    std::wstring batchFile;
    batchFile = L"\"B:\\code\\Batch\\all_files.bat\"";
    std::wstring args = L"\"B:\\code\\Batch\"";

    {
        wchar_t cmdP[500] = L"  ";
        GetEnvironmentVariable(L"COMSPEC", cmdP, 500);
        cmdPath = cmdP;
    }

    std::wstring CmdLine = L"/c " + batchFile + L" " + args;

    STARTUPINFO si;
    PROCESS_INFORMATION pi;

    ZeroMemory(&si, sizeof(si));
    si.cb = sizeof(si);
    ZeroMemory(&pi, sizeof(pi));
    if (!
        CreateProcess
        (
            cmdPath.c_str(),
            const_cast<LPWSTR>(CmdLine.c_str()),
            NULL, NULL, FALSE,
            CREATE_NEW_CONSOLE,
            NULL, NULL,
            &si,
            &pi
        )
        )
    {
        std::cout << "bad";
        std::cin.get();
        return 1;
    }
    std::cout << "yay......\n";
    std::cin.get();
    return 0;
}

And the Batch file is

echo hello.

set directory=%~1

cd %directory%

dir > files.txt

pause

exit 0

The Output

yay......

is got but the file files.txt nor the output of echo hello. is got.

The answer it seemed was the need to enclose the whole command line (except \c) with quotes.

hence the program becomes :

int main()
{
    std::wstring cmdPath;
    std::wstring batchFile;
    batchFile = L"\"B:\\Source code\\Batch\\all_files.bat\"";
    std::wstring args = L"\"B:\\Source code\\Batch\"";

    {
        wchar_t cmdP[500] = L"  ";
        GetEnvironmentVariable(L"COMSPEC", cmdP, 500);
        cmdPath = cmdP;
    }

    std::wstring CmdLine = L"/c " + std::wstring(L"\"") + batchFile + L" " + args + L"\"";

    STARTUPINFO si;
    PROCESS_INFORMATION pi;

    ZeroMemory(&si, sizeof(si));
    si.cb = sizeof(si);
    ZeroMemory(&pi, sizeof(pi));
    if (!
        CreateProcess
        (
            cmdPath.c_str(),
            const_cast<LPWSTR>(CmdLine.c_str()),
            NULL, NULL, FALSE,
            CREATE_NEW_CONSOLE,
            NULL, NULL,
            &si,
            &pi
        )
        )
    {
        std::cout << "bad";
        std::cin.get();
        return 1;
    }
    std::cout << "yay......\n";
    std::cin.get();
    return 0;
}

EDIT: for the final code I changed /k back to /c