C++实现获取汉字拼音首字母

中英文数字字母标点混合的情况，会自动过滤中文汉字和英文字母外的内容，如果取不到某个字符的拼音首字母就自动跳过。测试了下，基本上可以用。不过不是很完美，对某些汉字没办法取到首字母，比如现在很火的 “囧”，多音字也没办法处理。

//根据汉字字符串返回首字母字符串
#include <Windows.h>
class GB2Alpha
{
public:

    GB2Alpha()
    {
        pAlpha = NULL;
    }

    ~GB2Alpha()
    {
        if (pAlpha)
        {
            delete[] pAlpha;
            pAlpha = NULL;
        }
    }

    //得到实际的拼音首字母buffer
    const char* GetAlpha(const char* pStr)
    {
        if (pAlpha)
        {
            delete pAlpha;
            pAlpha = NULL;
        }
        if (!pStr)
        {
            return NULL;
        }

        char   chr[3];
        wchar_t   wchr   =   0;

        unsigned int nlen = strlen(pStr);
        pAlpha = new char[nlen+1];
        memset(pAlpha,0x00,nlen+1);

        int nIndex = 0; //首字母数组的长度索引

        for (int i = 0;i< nlen ;)
        {
            char tmpchar = '\0';

            if (pStr[i] > 0) //非汉字
            {
                if (pStr[i] >= 'a' && pStr[i] <= 'z')
                {
                    tmpchar = (char)(pStr[i] - 'a' + 'A');
                    pAlpha[nIndex++] = tmpchar;
                }
                if (pStr[i] >= 'A' && pStr[i] <= 'Z')
                {
                    tmpchar = pStr[i];
                    pAlpha[nIndex++] = tmpchar;
                }
                i++;
            }
            else //汉字
            {
                memset(chr,   0x00,   sizeof(chr));
                chr[0]   =   pStr[i++];
                chr[1]   =   pStr[i++];
                chr[2]   =   '\0';

                wchr   =   0;
                wchr   =   (chr[0]   &   0xff)   <<   8;
                wchr   |=  (chr[1]   &   0xff);

                tmpchar = convert(wchr);
                if(tmpchar != '\0')
                {
                    pAlpha[nIndex++] = tmpchar;
                }
            }
        }
        return pAlpha;
    }

private:
    //汉字首字母转换表
    char   convert(wchar_t   n)
    {
        if   (In(0xB0A1,0xB0C4,n))   return   'A';
        if   (In(0XB0C5,0XB2C0,n))   return   'B';
        if   (In(0xB2C1,0xB4ED,n))   return   'C';
        if   (In(0xB4EE,0xB6E9,n))   return   'D';
        if   (In(0xB6EA,0xB7A1,n))   return   'E';
        if   (In(0xB7A2,0xB8c0,n))   return   'F';
        if   (In(0xB8C1,0xB9FD,n))   return   'G';
        if   (In(0xB9FE,0xBBF6,n))   return   'H';
        if   (In(0xBBF7,0xBFA5,n))   return   'J';
        if   (In(0xBFA6,0xC0AB,n))   return   'K';
        if   (In(0xC0AC,0xC2E7,n))   return   'L';
        if   (In(0xC2E8,0xC4C2,n))   return   'M';
        if   (In(0xC4C3,0xC5B5,n))   return   'N';
        if   (In(0xC5B6,0xC5BD,n))   return   'O';
        if   (In(0xC5BE,0xC6D9,n))   return   'P';
        if   (In(0xC6DA,0xC8BA,n))   return   'Q';
        if   (In(0xC8BB,0xC8F5,n))   return   'R';
        if   (In(0xC8F6,0xCBF0,n))   return   'S';
        if   (In(0xCBFA,0xCDD9,n))   return   'T';
        if   (In(0xCDDA,0xCEF3,n))   return   'W';
        if   (In(0xCEF4,0xD188,n))   return   'X';
        if   (In(0xD1B9,0xD4D0,n))   return   'Y';
        if   (In(0xD4D1,0xD7F9,n))   return   'Z';
        return   '\0';
    }

    bool   In(wchar_t   start,   wchar_t   end,   wchar_t   code)
    {
        if   (code   >=   start   &&   code   <=   end)
        {
            return   true;
        }
        return   false;
    }

protected:
    char* pAlpha;
};