QUdpSocket : simple communication between 2 Qt applications
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Did you try the way I suggested ? Did that work ?
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hi @dheerendra ,
I don't understand,
i my server i have nothing to read, i only want to write. The reciver (2nd app) has to read (sk.receiveDatagram() ). am i missing something or you misunderstood my question ..?@LeLev
@dheerendra's code is the code to put into your client.
OIC, he wrote "server" --- it must have been a slip, he meant "client" :) -
That worked thank you very much
void skReady(){ QByteArray buffer; buffer.resize(static_cast<int>(sk->pendingDatagramSize())); QHostAddress sender("127.0.0.1"); quint16 senderPort=65111; qDebug()<<sk->readDatagram(buffer.data(), buffer.size(),&sender, &senderPort); } -
Some confusion with where to place my code. Code has to be placed in App2(receiver) & not in the sender(App1)
- Client is writing data. So what you have in sender is fine.
- Receiver - You should place the code I suggested.
Then tell me.
Dheerendra
@Community Service
Certified Qt Specialist
http://www.pthinks.com -
Some confusion with where to place my code. Code has to be placed in App2(receiver) & not in the sender(App1)
- Client is writing data. So what you have in sender is fine.
- Receiver - You should place the code I suggested.
Then tell me.
@dheerendra
I'm only used to TCP. Never thought about terminology for UDP! I would have called the [UDP] server the side which is writing, not client, but maybe you know better than I :)
https://stackoverflow.com/questions/9951875/who-is-the-server-and-who-is-the-client-in-udp -
OK. Client & Server is only terminology.
- Server is the one which is waiting for connection.
- Client is the one which is initiating the connection.
Once connection is established client/server terminology w.r.t data transfer is blurred as both will start transferring the data.
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You need to read the datagram. Try the following in server
int main(int argc, char *argv[]) { QApplication a(argc, argv); QUdpSocket sk; sk.bind(QHostAddress::Any,65222); QObject::connect(&sk,&QUdpSocket::readyRead,[&sk](){ qDebug() << Q_FUNC_INFO << endl; sk.receiveDatagram(); }); return a.exec(); }@dheerendra i am using QT widget application to receive udp packets from another PC. my udp source is a labview VI. i am able to receive the data which i am sending .it is displaying in the debug window but not displaying in the user interface window.i tried textedit and listwidget. but not displaying anything. this is my first QT pgm. plz help.
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@dheerendra i am using QT widget application to receive udp packets from another PC. my udp source is a labview VI. i am able to receive the data which i am sending .it is displaying in the debug window but not displaying in the user interface window.i tried textedit and listwidget. but not displaying anything. this is my first QT pgm. plz help.
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@reshu
Raise a new topic for this (and you will need to show some code beyond what you have asked here before anyone can help you). It has nothing to do with thisQUdpSocketissue. -
@reshu
So when you go to https://forum.qt.io/category/10/general-and-desktop you do not see a big blue New Topic button at the top of the page?You seemed to be able to raise https://forum.qt.io/topic/113963/udp-data-reception ?
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@reshu
So when you go to https://forum.qt.io/category/10/general-and-desktop you do not see a big blue New Topic button at the top of the page?You seemed to be able to raise https://forum.qt.io/topic/113963/udp-data-reception ?
