char 转wchar_t 及wchar_t转char

原文来自 http://haofu123.blog.163.com/blog/static/178294920096243161997/

利用widechartomultibyte来转换的函数

通常适合于window平台上使用

#include <tchar.h>

#include <windows.h>

int _tmain(int argc, _tchar* argv[])

{

wchar_t pwstr[] =l"我是中国人";

wchar_t pwstr2[20];

    char *pcstr = (char *)malloc(sizeof(char)*(2 * wcslen(pwstr)+1));

    memset(pcstr , 0 , 2 * wcslen(pwstr)+1 );

    w2c(pcstr,pwstr,2 * wcslen(pwstr)+1) ;

    printf("%s\n",pcstr);

c2w(pwstr2,20,pcstr);

wprintf(l"%s",pwstr2);

    free(pcstr) ;

return 0;

}

//将wchar_t* 转成char*的实现函数如下：

char *w2c(char *pcstr,const wchar_t *pwstr, size_t len)

{

int nlength=wcslen(pwstr);

//获取转换后的长度

int nbytes = WideCharToMultiByte( 0, // specify the code page used to perform the conversion

0,         // no special flags to handle unmapped characters

pwstr,     // wide character string to convert

nlength,   // the number of wide characters in that string

NULL,      // no output buffer given, we just want to know how long it needs to be

0,

NULL,      // no replacement character given

NULL );    // we don't want to know if a character didn't make it through the translation

// make sure the buffer is big enough for this, making it larger if necessary

if(nbytes>len)   nbytes=len;

// 通过以上得到的结果，转换unicode 字符为ascii 字符

WideCharToMultiByte( 0, // specify the code page used to perform the conversion

0,         // no special flags to handle unmapped characters

pwstr,   // wide character string to convert

nlength,   // the number of wide characters in that string

pcstr, // put the output ascii characters at the end of the buffer

nbytes,                           // there is at least this much space there

NULL,      // no replacement character given

NULL );

return pcstr ;

}

//将char* 转成wchar_t*的实现函数如下：

//这是把asii字符转换为unicode字符，和上面相同的原理

void c2w(wchar_t *pwstr,size_t len,const char *str)

{

if(str)

    {

      size_t nu = strlen(str);

      size_t n =(size_t)multibytetowidechar(cp_acp,0,(const char *)str,(int)nu,null,0);

      if(n>=len)n=len-1;

      multibytetowidechar(cp_acp,0,(const char *)str,(int)nu,pwstr,(int)n);

   pwstr[n]=0;

    }

}

或者用此种方法更好一些：============我自已做的

//把ascii 字符转换为unicode字符

wchar_t* Cphone_hq::ctow(wchar_t *pwstr, const char *str)

{

wchar_t* buffer;

if(str)

    {

      size_t nu = strlen(str);

      size_t n =(size_t)MultiByteToWideChar(CP_ACP,0,(const char *)str,int(nu),NULL,0);

   buffer=0;

      buffer = new wchar_t[n+1];

      //if(n>=len) n=len-1;

   ::MultiByteToWideChar(CP_ACP,0,(const char *)str,int(nu),buffer,int(n));

   }

return buffer;

delete buffer;

}