宽字符至多字符的相互转换方法

1. unicode宽字符至多字符的转换

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( // Bytes required for "hello" is 5, does not include null terminator

        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 );

   

    // 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( // Writes 5 bytes "hello", does not write a null terminator after that

        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 ;

}


2. 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
=0;

    }

}