CRT and C++ Differences from Windows Desktop (Compact 2013)
10/26/2015
This section provides an overview of how the CRT and C++ libraries in Windows Embedded Compact 2013 differ from the CRT and C++ libraries in Windows desktop. For complete documentation of the CRT and C++ libraries included with Visual Studio 2013 and Visual Studio 2015, see the following sources on MSDN:
Console input and output
Compact 2013 does not support input or output to a console. This affects the functions listed in the following table.
Function |
Impact |
|---|---|
stdin, stdout, stderr |
Not supported |
_dup, _dup2 |
Supports file input/output only. |
freopen, freopen_s, _wfreopen, _wfreopen_s |
Does not support the keyword CON (redirect back to console) |
Static CRT linking
Compact 2013 does not static links to CRT libraries. This affects the functions listed in the following table.
Function |
Impact |
|---|---|
__getmainargs, __wgetmainargs |
These functions must be linked with the setargv.obj or Wsetargv.obj file in order to operate correctly. For more information about these files, see Expanding Wildcard Arguments on MSDN. |
_CrtDbgReportW in debug builds only
The function _CrtDbgReportW is available only when you build an OS design in the debug configuration. This function has the following return values:
- In OS images built with the debug configuration
- The function outputs a message through OutPutDebugStringW
- If the report type is set to _CRT_ASSERT, the function starts the debugger. If the report type is set to _CRT_WARN or _CRT_ERROR, the function does not start the debugger.
- The function returns 0.
- In OS images built with the retail configuration, The function always returns an error (-1).
Per-thread locale
Compact 2013 does not support pre-thread locale. This directly affects the function _configthreadlocale, but it may also cause issues in program structure.
Unsupported functions
Compact 2013 does not support the functions in the following list.
- _chdrive
- _configthreadlocale (Per thread locale is not supported.)
- _dupenv_s (also _dupenv_s, _wdupenv_s)
- _fstat (also _fstat32, _fstat32i64, _fstat64, _fstat64i32)
- _fullpath (also _fullpath, _wfullpath)
- _getcwd (also _getcwd, _wgetcwd)
- _getdcwd (also _getdcwd, _wgetdcwd)
- _getdiskfree
- _getdrive
- _getdrives
- _open_osfhandle
- _pipe
- _putenv (also _putenv, _wputenv)
- _putenv_s (also _putenv_s, _wputenv_s)
- _searchenv (also _searchenv, _wsearchenv)
- _searchenv_s (also _searchenv_s, _wsearchenv_s)
- _set_doserrno
- _stat (also _stat32, _stat32i64, _stat64, _stat64i32)
- _tempnam (also _tempnam, _wtempnam)
- _wstat (also _wstat32, _wstat32i64, _wstat64, _wstat64i32)
- getenv (getenv, _wgetenv)
- getenv_s (getenv_s, _wgetenv_s)