获取中文首字母

头文件 

#ifndef INITIAL_H
#define INITIAL_H
#include <string>
using namespace std;
/**
 * @brief The Initial class
 * get the initial letters of a Chinese string
 */
class Initial
{
public:
    Initial();
    ~Initial();
    char *GetIntial(string str);
private:
    static char Convert(wchar_t n);
    static bool Input(wchar_t start, wchar_t end, wchar_t code);
private:
    char *m_buff;
};

#endif // INITIAL_H

cpp文件

#include "initial.h"

Initial::Initial()
{
    m_buff = NULL;
}

Initial::~Initial()
{
    if(m_buff != NULL)
    {
        delete m_buff;
    }
}

char *Initial::GetIntial(string str)
{
    char chr[3];
    wchar_t wchr = 0;
    m_buff = new char[str.length()/2];
    memset(m_buff, 0, sizeof(char)*str.length()/2+1);

    for(int i = 0, j = 0; i < (str.length()/2); ++i)
    {
        memset(chr, 0, sizeof(chr));
        chr[0] = str[j++];
        chr[1] = str[j++];
        chr[2] = '\0';

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

        m_buff[i] = Convert(wchr);
    }

    return m_buff;
}

char Initial::Convert(wchar_t n)
{
    if(Input(0xB0A1, 0xB0C4, n)) return 'a';
    if(Input(0XB0C5, 0XB2C0, n)) return 'b';
    if(Input(0xB2C1, 0xB4ED, n)) return 'c';
    if(Input(0xB4EE, 0xB6E9, n)) return 'd';
    if(Input(0xB6EA, 0xB7A1, n)) return 'e';
    if(Input(0xB7A2, 0xB8c0, n)) return 'f';
    if(Input(0xB8C1, 0xB9FD, n)) return 'g';
    if(Input(0xB9FE, 0xBBF6, n)) return 'h';
    if(Input(0xBBF7, 0xBFA5, n)) return 'j';
    if(Input(0xBFA6, 0xC0AB, n)) return 'k';
    if(Input(0xC0AC, 0xC2E7, n)) return 'l';
    if(Input(0xC2E8, 0xC4C2, n)) return 'm';
    if(Input(0xC4C3, 0xC5B5, n)) return 'n';
    if(Input(0xC5B6, 0xC5BD, n)) return 'o';
    if(Input(0xC5BE, 0xC6D9, n)) return 'p';
    if(Input(0xC6DA, 0xC8BA, n)) return 'q';
    if(Input(0xC8BB, 0xC8F5, n)) return 'r';
    if(Input(0xC8F6, 0xCBF0, n)) return 's';
    if(Input(0xCBFA, 0xCDD9, n)) return 't';
    if(Input(0xCDDA, 0xCEF3, n)) return 'w';
    if(Input(0xCEF4, 0xD188, n)) return 'x';
    if(Input(0xD1B9, 0xD4D0, n)) return 'y';
    if(Input(0xD4D1, 0xD7F9, n)) return 'z';
    return '\0';
}

bool Initial::Input(wchar_t start, wchar_t end, wchar_t code)
{
    if(code >= start && code <= end)
    {
        return true;
    }
    else
    {
        return false;
    }
}