将char转换为wchar_t

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
#include <locale.h>

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

#include <iostream>
#include <sstream>
#include <fstream>
#include <string>

void Init()  
{  
  const char *locale = "zh_CN.utf8";  
    // 根据环境变量设置locale  
  setlocale(LC_CTYPE, locale);  
}  
  
int to_wchar(wchar_t* &dest, char* &src,int n)  
{    
  return mbstowcs(dest, src, n);  
} 

int main(int args, char **argv)
{

  int handle=open(argv[1], O_CREAT|O_RDWR,S_IREAD|S_IWRITE);
  int dsize = lseek(handle, 0, SEEK_END);

  printf("dsize:%d\n", dsize);


  Init();

  std::ifstream fin(argv[1], std::ios::in);
  const static int MAXCL = 1024*3;
  char *line = new char[MAXCL];
  wchar_t *wline = new wchar_t[MAXCL];
  while(fin.getline(line, MAXCL))
  {
    int clen = strlen(line);
    int wlen = to_wchar(wline, line, clen);
    
    printf("len:%d\twlen:%d\tvalue:%s\n", clen, wlen, line);
    

    for (int i=0; i<wlen; i++)
    {
      printf("%d\t%X\n", i, wline[i]);
    }
    
    
  }

  fin.clear();
  fin.close();
  return 0;
}

#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <wchar.h>
#include <locale.h>
#include <iostream>

using namespace std;

void Init()
{
  const char *locale = "zh_CN.utf8";
  // 根据环境变量设置locale
  setlocale(LC_CTYPE, locale);
}

int to_wchar(wchar_t* &dest, char* &src,int n)
{  
  return mbstowcs(dest, src, n);
}

int main()
{
  char* str1 = "abc123";
  char* str2 = "abc124";
  wchar_t *w_str1 ;
  wchar_t *w_str2 ;
  
  w_str1 = new wchar_t[20];
  w_str2 = new wchar_t[20];
  
  
  Init();
 
 
  to_wchar(w_str1,str1, strlen(str1));
  to_wchar(w_str2,str2,strlen(str2));
  
  //wcout <<"wsize: "<<sizeof(w_str[0]) <<w_str[0] << "--" << w_str[1] << "--" << w_str[2]<<endl;

  wcout<<"w_str: "<<w_str1<<endl;
  wcout<<"w_str: "<<w_str2<<endl;
  
  wcout<<"cmp: "<<wcsncmp(w_str1, w_str2, 3)<<endl;
  
  delete(w_str1);
  delete(w_str2);  
  
  return 0;
}