| weiweiqiao |
2017-06-19 21:07 |
关于Qt中tcp/udp编程的问题
如题，我在看《CppGuiProgrammingWithQt4》书介绍tcp/udp编程时，对于tcp使用类似下列code进行读取，- QDataStream in(&tcp_socket_);
in.setVersion(QDataStream::Qt_5_0);
forever {
//读取数据流，获取整个数据的长度信息
if (0 == next_block_size_) {
if (tcp_socket_.bytesAvailable() < sizeof(quint16)) {
break;
}
in >> next_block_size_;
}
//当整个数据流被读取后跳出
if (tcp_socket_.bytesAvailable() < next_block_size_) {
break;
}
QDate date;
QTime departure_time;
QTime arrival_time;
quint16 duration;
quint8 changes;
QString train_type;
in >> date >> departure_time >> duration >> changes >> train_type;
- QByteArray data_block;
do {
data_block.resize(pendingDatagramSize());
readDatagram(data_block.data(), data_block.size());
} while (hasPendingDatagrams());
QDataStream in(&data_block, QIODevice::ReadOnly);
in.setVersion(QDataStream::Qt_5_0);
in >> cat_62_;
if (CAT_62_INDEX != cat_62_) {
return;
}
in >> block_size_;
if (data_block.size() != block_size_) {
return;
}
QByteArray block_data;
in >> block_data;
if (block_data.size() != (block_size_ - 3)) {
return;
}
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