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Comment by stinos | Hacker News Reader

It looks pretty usable indeed, I just wish they had insludes std::error_code implementations for everything. Last time I checked, getting proper error_codes (i.e. which can be compared against standard categories and which have good error description strings) for everything in the API was still some manual work.

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It's not too hard. Just write a simple wrapper around FormatMessage:

  DWORD errorCode = GetLastError();

  DWORD dwFlg = FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM |    FORMAT_MESSAGE_IGNORE_INSERTS;
  LPTSTR lpMsgBuf = NULL;
  FormatMessageA(dwFlg, 0, errorCode, 0, (LPTSTR)&lpMsgBuf, 0, NULL);

  // Error message is in lpMsgBuf so make sure to free afterwards.
  LocalFree(lpMsgBuf);

It's even easier since the MSVC STL std::error_code (std::system_category) already does that.

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