C/C++ 获取汉字拼音首字母

#include <stdint.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>

bool between(uint32_t start,uint32_t end,uint32_t aim);
char get_first_letter(wchar_t wchar);
void get_first_letters(const char *szChinese,char piyinBuf[],const uint32_t maxBufLen,uint32_t &piyinBufLen);


int32_t main()
{
    char buf[1024] = {0};
    uint32_t len = 0;
    const char *szChinese = "qaz123获取汉字拼音";
    get_first_letters(szChinese,buf,1024,len);
    printf("%s
",buf);
    return 0;
}

void get_first_letters(const char *szChinese,char piyinBuf[],const uint32_t maxBufLen,uint32_t &piyinBufLen)
{
    uint8_t chr[3];
    piyinBufLen = 0;
    uint32_t chineseLen = strlen(szChinese);
    for (uint32_t i = 0; i < chineseLen && piyinBufLen < maxBufLen; ++i)
    {
        uint8_t c = szChinese[i];
        // 排除askii 码
        if (isascii(c))
        {
            piyinBuf[piyinBufLen++] = c;
        }
        else
        {
            chr[0] = szChinese[i];
            chr[1] = szChinese[++i];
            chr[2] = 0;
            wchar_t wchr = 0;
            wchr =  (chr[0]  &  0xff)  <<  8;
            wchr |= (chr[1]  &  0xff);
            piyinBuf[piyinBufLen++] = toupper(get_first_letter(wchr));
        }
    }
}

bool between(wchar_t start,wchar_t end,wchar_t aim)
{
    if (start <= aim && aim <= end)
    {
        return true;
    }
    return false;
}

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