parameter of system() in linux C++,Qt

when I call system() with a long string(and it contains some Chinese characters),

system() seems not to deal my parameter correctly.

e.g. what system() recieved was not the same with what I sent

//it ba开发者_运维技巧sed on Qt

void work(QString order)
{
   system((const char*)order.toLocal8Bit());
   // in terminal, it shows a wrong command different with what it should be.
}

and when i call

work( "g++ "+nfile+name+".cpp -o "+nfile+name+" 2>"+nfile+"compiler.out" );

nfile represents a long path with some Chinese characters

If you are using Qt, then its better to use QProcess rather than system, see here

Convert the string to UTF-8 and pass that to system():

void work(const QString &order)
{
   system(order.toUtf8().constData());
}

According to the documentation for toLocal8Bit()

The returned byte array is undefined if the string contains characters not supported by the local 8-bit encoding.

I'm assuming the Chinese characters you're using aren't supported. You may wish to try toUtf8 instead.