QT做UDP组播,一行长度为248,全帧长度为248*128,从某个地址接收的每一包的行数不固定,每行末尾子帧同步码F1F330,副帧同步码0230DF,将接收的每一包都先判断每一行的长度是否是正确的以及子帧或副帧同步码是否正确,如果正确,用数组缓存起来,在判断收到副帧同步码时将全帧打包发送给另一地址,给出代码及注释
时间: 2024-03-27 15:40:57 浏览: 13
以下是一个根据你的要求进行修改后的示例代码,可以帮助你实现UDP组播接收和发送:
```cpp
#include <QtNetwork/QUdpSocket>
const int MAX_BUFFER_SIZE = 248 * 128;
void receiveData()
{
QUdpSocket udpSocket;
udpSocket.bind(QHostAddress::AnyIPv4, 12345, QUdpSocket::ShareAddress);
QByteArray frameBuffer;
int rowCount = 0;
while (true) {
QByteArray buffer;
buffer.resize(udpSocket.pendingDatagramSize());
QHostAddress sender;
quint16 senderPort;
udpSocket.readDatagram(buffer.data(), buffer.size(), &sender, &senderPort);
// 判断同步码
if (buffer.endsWith(QByteArray::fromHex("F1F330")) ||
buffer.endsWith(QByteArray::fromHex("0230DF"))) {
// 判断行数和长度
if (buffer.size() % 248 == 0 && buffer.size() <= MAX_BUFFER_SIZE) {
int newRowCount = buffer.size() / 248;
if (rowCount + newRowCount > 128) {
// 数据包错误,重置缓存
frameBuffer.clear();
rowCount = 0;
}
// 缓存数据
frameBuffer.append(buffer);
rowCount += newRowCount;
// 判断是否收到副帧同步码
if (buffer.endsWith(QByteArray::fromHex("0230DF"))) {
// 打包数据
QByteArray data = frameBuffer.left(rowCount * 248);
// 发送数据
QUdpSocket sendSocket;
sendSocket.writeDatagram(data, QHostAddress("192.168.1.255"), 12346);
// 重置缓存
frameBuffer.clear();
rowCount = 0;
}
}
}
}
}
void sendData()
{
QUdpSocket udpSocket;
udpSocket.bind(QHostAddress::AnyIPv4, 12346, QUdpSocket::ShareAddress);
while (true) {
// 接收数据
QByteArray buffer;
buffer.resize(udpSocket.pendingDatagramSize());
QHostAddress sender;
quint16 senderPort;
udpSocket.readDatagram(buffer.data(), buffer.size(), &sender, &senderPort);
// 处理数据
// ...
// 发送数据
udpSocket.writeDatagram(buffer, QHostAddress::Broadcast, 12345);
}
}
```
以上代码仅供参考,你需要根据实际情况进行修改。其中需要注意的是,如果要在Windows系统中使用组播,需要在代码中添加以下行:
```cpp
udpSocket.setSocketOption(QAbstractSocket::MulticastTtlOption, 1);
udpSocket.setSocketOption(QAbstractSocket::MulticastLoopbackOption, 0);
udpSocket.joinMulticastGroup(QHostAddress("224.0.0.1"));
```
这样才能正确地加入组播组并接收和发送数据。