谁能给我讲解先这段代码?
QTextStream stream(&fw);
stream << "##########################################################\n";
stream << "############ Storage Unit Label ##############\n#\n";
stream << "#Sequence number: " << _sul.sequenceNo << "\n";
stream << "#DLIS version: " << _sul.version << "\n";
stream << "#Structure: " << _sul.structure << "\n";
stream << "#Maximum record length: " << _sul.maxRecordLength << "\n";
我这里的疑问是 <<在这里起的是什么运算符号的作用??是吧后面的字符串写近Stream流里吗??