QT使用ifstream读取含中文路径的txt文件

#include <QCoreApplication>
#include<iostream>
#include<iomanip>
#include<fstream>
#include<QTextCodec>
#include<qdebug>
using namespace std;
int main(int argc, char *argv[])
{
 QCoreApplication a(argc, argv);
 QTextCodec::setCodecForLocale(QTextCodec::codecForName("GBK"));
 QString qq="C:\\Users\\威\\Desktop\\a.txt";
 char*  ch;
 QByteArray ba = qq.toLocal8Bit();  // must
 ch=ba.data();
 cout<<ch<<endl;
ifstream in(ch);
if (!in)
{
cout << "erro" <<endl;
}
for(string str;getline(in,str);){
   cout<<str<<endl;
 
}
    return a.exec();
}
参考链接：https://blog.csdn.net/qq_33148269/article/details/77685343