Linux 下char转换为wchar_t

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LInux下使用mbstowcs函数可以将char转化为wchar_t
函数含义：convert a multibyte string to a wide char string
说明： The behaviour of mbstowcs depends on the LC_CTYPE category of the current locale
返回值： The mbstowcs() function returns the number of wide characters that make up the converted part of the wide-char-acter string, not including the terminating null wide character. If an invalid multibyte sequence was encountered, (size_t) -1 is returned.

注意：wcout 与cout不要混合使用，否则会导致wchar_t的输出问题

代码：

#include <string.h>#include <stdio.h>#include <stdlib.h>#include <wchar.h>#include <locale.h>#include <iostream>using namespace std;// 将char类型转化为wchar// src:  源// dest: 目标// locale: 环境变量的值，mbstowcs依赖此值来判断src的编码方式// 运行成功返回0 否则返回-1//int ToWchar(char* &src, wchar_t* &dest, const char *locale = "zh_CN.utf8"){  if (src == NULL) {    dest = NULL;    return 0;  }  // 根据环境变量设置locale  setlocale(LC_CTYPE, locale);  // 得到转化为需要的宽字符大小  int w_size = mbstowcs(NULL, src, 0) + 1;  // w_size = 0 说明mbstowcs返回值为-1。即在运行过程中遇到了非法字符(很有可能使locale  // 没有设置正确)  if (w_size == 0) {    dest = NULL;    return -1;  }  wcout << "w_size" << w_size << endl;  dest = new wchar_t[w_size];  if (!dest) {      return -1;  }  int ret = mbstowcs(dest, src, strlen(src)+1);  if (ret <= 0) {    return -1;  }  return 0;}int main(){  char* str = "中国123";  wchar_t *w_str ;  ToWchar(str,w_str);  wcout << w_str[0] << "--" << w_str[1] << "--" << w_str[2];  delete(w_str);  return 0;}

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