Method execute_process

cpp-subprocess/subprocess.hpp:1642–1816

inline void Popen::execute_process() noexcept(false)
{
#ifdef __USING_WINDOWS__
  if (this->shell_) {
    throw OSError("shell not currently supported on windows", 0);
  }

  void* environment_string_table_ptr = nullptr;
  env_vector_t environment_string_vector;
  if(this->env_.size()){
	  environment_string_vector = util::CreateUpdatedWindowsEnvironmentVector(env_);
	  environment_string_table_ptr = (void*)environment_string_vector.data();
  }

  if (exe_name_.length()) {
    this->vargs_.insert(this->vargs_.begin(), this->exe_name_);
    this->populate_c_argv();
  }
  this->exe_name_ = vargs_[0];

  std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>> converter;
  std::wstring argument;
  std::wstring command_line;
  bool first_arg = true;

  for (auto arg : this->vargs_) {
    if (!first_arg) {
      command_line += L" ";
    } else {
      first_arg = false;
    }
    argument = converter.from_bytes(arg);
    util::quote_argument(argument, command_line, false);
  }

  // CreateProcessW can modify szCmdLine so we allocate needed memory
  wchar_t *szCmdline = new wchar_t[command_line.size() + 1];
  wcscpy_s(szCmdline, command_line.size() + 1, command_line.c_str());
  PROCESS_INFORMATION piProcInfo;
  STARTUPINFOW siStartInfo;
  BOOL bSuccess = FALSE;
  DWORD creation_flags = CREATE_UNICODE_ENVIRONMENT | CREATE_NO_WINDOW;

  // Set up members of the PROCESS_INFORMATION structure.
  ZeroMemory(&piProcInfo, sizeof(PROCESS_INFORMATION));

  // Set up members of the STARTUPINFOW structure.
  // This structure specifies the STDIN and STDOUT handles for redirection.

  ZeroMemory(&siStartInfo, sizeof(STARTUPINFOW));
  siStartInfo.cb = sizeof(STARTUPINFOW);

  siStartInfo.hStdError = this->stream_.g_hChildStd_ERR_Wr;
  siStartInfo.hStdOutput = this->stream_.g_hChildStd_OUT_Wr;
  siStartInfo.hStdInput = this->stream_.g_hChildStd_IN_Rd;

  siStartInfo.dwFlags |= STARTF_USESTDHANDLES;