qt 获取汉字拼音首字母

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QDebug>
#include <QTextCodec>
QString getChineseSpell(QString& src);
QString FirstLetter(int nCode);
char convert(int n);

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
QString str = tr("这是一个正确的例子");
QString character = getChineseSpell(str);
qDebug()<<character;
}

MainWindow::~MainWindow()
{
delete ui;
}

QString getChineseSpell(QString& src)
{
QTextCodec *codec4gbk = QTextCodec::codecForName("GBK"); //获取qt提供的gbk的解码器
QByteArray buf = codec4gbk->fromUnicode(src); //qt用的unicode，转成gbk
int size = buf.size();
quint16 *array = new quint16[size+1];
QString alphbats;

for( int i = 0, j = 0; i < buf.size(); i++, j++ )
{
if( (quint8)buf[i] < 0x80 ) //gbk的第一个字节都大于0x81，所以小于0x80的都是符号，字母，数字etc
continue;
array[j] = (((quint8)buf[i]) << 8) + (quint8)buf[i+1]; //计算gbk编码
i++;
alphbats.append( convert( array[j] ) ); //相当于查表，用gbk编码得到首拼音字母
}
delete [] array;
return alphbats;
}

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

char convert(int 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 '';
}