Linux C ++，Qt中system（）的参数

Question

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

system() seems not to deal my parameter correctly.

eg what system() recieved was not the same with what I sent

//it based 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

Answer 1

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

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

Answer 2

如果您使用的是Qt，那么最好使用QProcess而不是system ，请参见此处

Answer 3

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.