wchar_t 与 char的转换

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本文介绍如何使用 wcstombs 和 mbstowcs 函数族将宽字符与多字节字符相互转换。这些函数支持不同本地设置，并提供了更安全的版本来增强安全性。

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Converts a sequence of wide characters to a corresponding sequence of multibyte characters. More secure versions of these functions are available; see wcstombs_s, _wcstombs_s_l.

size_t wcstombs(
   char *mbstr,
   const wchar_t *wcstr,
   size_t count
);
size_t _wcstombs_l(
   char *mbstr,
   const wchar_t *wcstr,
   size_t count,
   _locale_t locale
);
template <size_t size>
size_t wcstombs(
   char (&mbstr)[size],
   const wchar_t *wcstr,
   size_t count
); // C++ only
template <size_t size>
size_t _wcstombs_l(
   char (&mbstr)[size],
   const wchar_t *wcstr,
   size_t count,
   _locale_t locale
); // C++ only

Parameters
mbstr
The address of a sequence of multibyte characters.

wcstr
The address of a sequence of wide characters.

count
The maximum number of bytes that can be stored in the multibyte output string.

locale
The locale to use.

Converts a sequence of multibyte characters to a corresponding sequence of wide characters. Versions of mbstowcs, _mbstowcs_l with security enhancements as described in Security Enhancements in the CRT.


errno_t mbstowcs_s( size_t pReturnValue, wchar_t wcstr, size_t sizeInWords, const char mbstr, size_t count ); errno_t _mbstowcs_s_l( size_t pReturnValue, wchar_t wcstr, size_t sizeInWords, const char mbstr, size_t count, _locale_t locale ); template <size_t size> errno_t mbstowcs_s( size_t pReturnValue, wchar_t (&wcstr)[size], const char mbstr, size_t count ); // C++ only template <size_t size> errno_t _mbstowcs_s_l( size_t pReturnValue, wchar_t (&wcstr)[size], const char mbstr, size_t count, _locale_t locale ); // C++ only

errno_t mbstowcs_s(
   size_t *pReturnValue,
   wchar_t *wcstr,
   size_t sizeInWords,
   const char *mbstr,
   size_t count 
);
errno_t _mbstowcs_s_l(
   size_t *pReturnValue,
   wchar_t *wcstr,
   size_t sizeInWords,
   const char *mbstr,
   size_t count,
   _locale_t locale
);
template <size_t size>
errno_t mbstowcs_s(
   size_t *pReturnValue,
   wchar_t (&wcstr)[size],
   const char *mbstr,
   size_t count 
); // C++ only
template <size_t size>
errno_t _mbstowcs_s_l(
   size_t *pReturnValue,
   wchar_t (&wcstr)[size],
   const char *mbstr,
   size_t count,
   _locale_t locale
); // C++ only