Mixing
Send/Receive QImage with QTcpSocket
I'm working on a simple Qt application for video streaming over TCP. There is a device (server side) that start listening for incoming connections. When a new connection is created, the server start to send images to the client. On the other side, the client receive and display the images.
I've read a lot about IPC on Qt, datastream and transactions, but I'm yet struggling with reading the incoming data. I know that TCP divide a long block in several packets, that's the point I'm in trouble.
Here is my code for sending ..
void CameraServer::sendData(const QImage &img)
{
if (mTcpClient->state() == QTcpSocket::ConnectedState) {
QByteArray imgArray = QByteArray::fromRawData((const char*) img.bits(), img.byteCount());
// init
QByteArray data;
QDataStream outStream(&data, QIODevice::WriteOnly);
outStream.setDevice(mTcpClient);
outStream.setVersion(QDataStream::Qt_5_11);
// serialize
outStream << imgArray.size();
outStream << imgArray;
// send
mTcpClient.write(data);
mTcpClient->waitForBytesWritten();
mTcpClient->flush();
qDebug() << "Sent" << data.size() << "bytes";
}
.. and for reading.
void VCameraClient::readData()
{
qDebug() << "Received" << mTcpSocket->bytesAvailable() << "bytes";
if (size == 0) {
// read the image size
// toBeRead is a class private member
inputStream >> toBeRead;
}
// read partial data
// byteArr is a class private member
if (mTcpSocket->bytesAvailable() < toBeRead) {
byteArr.append(mTcpSocket->read(mTcpSocket->bytesAvailable()));
// update the size to be read
toBeRead -= byteArr.size();
}
// read completed
if (toBeRead <= 0) {
mframe = QImage((const uchar*) byteArr.data(), 640, 480, QImage::FormatRGB888);
emit newFrameRead(mFrame);
}
}
Could anyone help me, please? How to use QDataStream transactions properly?
ipc qimage qtcpsocket qtcpserver
asked Nov 19 '18 at 15:58
gont_
35
add a comment |
I'm working on a simple Qt application for video streaming over TCP. There is a device (server side) that start listening for incoming connections. When a new connection is created, the server start to send images to the client. On the other side, the client receive and display the images.
I've read a lot about IPC on Qt, datastream and transactions, but I'm yet struggling with reading the incoming data. I know that TCP divide a long block in several packets, that's the point I'm in trouble.
Here is my code for sending ..
void CameraServer::sendData(const QImage &img)
{
if (mTcpClient->state() == QTcpSocket::ConnectedState) {
QByteArray imgArray = QByteArray::fromRawData((const char*) img.bits(), img.byteCount());
// init
QByteArray data;
QDataStream outStream(&data, QIODevice::WriteOnly);
outStream.setDevice(mTcpClient);
outStream.setVersion(QDataStream::Qt_5_11);
// serialize
outStream << imgArray.size();
outStream << imgArray;
// send
mTcpClient.write(data);
mTcpClient->waitForBytesWritten();
mTcpClient->flush();
qDebug() << "Sent" << data.size() << "bytes";
}
.. and for reading.
void VCameraClient::readData()
{
qDebug() << "Received" << mTcpSocket->bytesAvailable() << "bytes";
if (size == 0) {
// read the image size
// toBeRead is a class private member
inputStream >> toBeRead;
}
// read partial data
// byteArr is a class private member
if (mTcpSocket->bytesAvailable() < toBeRead) {
byteArr.append(mTcpSocket->read(mTcpSocket->bytesAvailable()));
// update the size to be read
toBeRead -= byteArr.size();
}
// read completed
if (toBeRead <= 0) {
mframe = QImage((const uchar*) byteArr.data(), 640, 480, QImage::FormatRGB888);
emit newFrameRead(mFrame);
}
}
Could anyone help me, please? How to use QDataStream transactions properly?
ipc qimage qtcpsocket qtcpserver
asked Nov 19 '18 at 15:58
gont_
35
add a comment |
I'm working on a simple Qt application for video streaming over TCP. There is a device (server side) that start listening for incoming connections. When a new connection is created, the server start to send images to the client. On the other side, the client receive and display the images.
I've read a lot about IPC on Qt, datastream and transactions, but I'm yet struggling with reading the incoming data. I know that TCP divide a long block in several packets, that's the point I'm in trouble.
Here is my code for sending ..
void CameraServer::sendData(const QImage &img)
{
if (mTcpClient->state() == QTcpSocket::ConnectedState) {
QByteArray imgArray = QByteArray::fromRawData((const char*) img.bits(), img.byteCount());
// init
QByteArray data;
QDataStream outStream(&data, QIODevice::WriteOnly);
outStream.setDevice(mTcpClient);
outStream.setVersion(QDataStream::Qt_5_11);
// serialize
outStream << imgArray.size();
outStream << imgArray;
// send
mTcpClient.write(data);
mTcpClient->waitForBytesWritten();
mTcpClient->flush();
qDebug() << "Sent" << data.size() << "bytes";
}
.. and for reading.
void VCameraClient::readData()
{
qDebug() << "Received" << mTcpSocket->bytesAvailable() << "bytes";
if (size == 0) {
// read the image size
// toBeRead is a class private member
inputStream >> toBeRead;
}
// read partial data
// byteArr is a class private member
if (mTcpSocket->bytesAvailable() < toBeRead) {
byteArr.append(mTcpSocket->read(mTcpSocket->bytesAvailable()));
// update the size to be read
toBeRead -= byteArr.size();
}
// read completed
if (toBeRead <= 0) {
mframe = QImage((const uchar*) byteArr.data(), 640, 480, QImage::FormatRGB888);
emit newFrameRead(mFrame);
}
}
Could anyone help me, please? How to use QDataStream transactions properly?
ipc qimage qtcpsocket qtcpserver
asked Nov 19 '18 at 15:58
gont_
35
I'm working on a simple Qt application for video streaming over TCP. There is a device (server side) that start listening for incoming connections. When a new connection is created, the server start to send images to the client. On the other side, the client receive and display the images.
I've read a lot about IPC on Qt, datastream and transactions, but I'm yet struggling with reading the incoming data. I know that TCP divide a long block in several packets, that's the point I'm in trouble.
Here is my code for sending ..
void CameraServer::sendData(const QImage &img)
{
if (mTcpClient->state() == QTcpSocket::ConnectedState) {
QByteArray imgArray = QByteArray::fromRawData((const char*) img.bits(), img.byteCount());
// init
QByteArray data;
QDataStream outStream(&data, QIODevice::WriteOnly);
outStream.setDevice(mTcpClient);
outStream.setVersion(QDataStream::Qt_5_11);
// serialize
outStream << imgArray.size();
outStream << imgArray;
// send
mTcpClient.write(data);
mTcpClient->waitForBytesWritten();
mTcpClient->flush();
qDebug() << "Sent" << data.size() << "bytes";
}
.. and for reading.
void VCameraClient::readData()
{
qDebug() << "Received" << mTcpSocket->bytesAvailable() << "bytes";
if (size == 0) {
// read the image size
// toBeRead is a class private member
inputStream >> toBeRead;
}
// read partial data
// byteArr is a class private member
if (mTcpSocket->bytesAvailable() < toBeRead) {
byteArr.append(mTcpSocket->read(mTcpSocket->bytesAvailable()));
// update the size to be read
toBeRead -= byteArr.size();
}
// read completed
if (toBeRead <= 0) {
mframe = QImage((const uchar*) byteArr.data(), 640, 480, QImage::FormatRGB888);
emit newFrameRead(mFrame);
}
}
Could anyone help me, please? How to use QDataStream transactions properly?
ipc qimage qtcpsocket qtcpserver
ipc qimage qtcpsocket qtcpserver
asked Nov 19 '18 at 15:58
gont_
35
asked Nov 19 '18 at 15:58
gont_
35
edited Nov 20 '18 at 16:18
asked Nov 19 '18 at 15:58
gont_
35
asked Nov 19 '18 at 15:58
gont_
35
asked Nov 19 '18 at 15:58
gont_
35
35
add a comment |
add a comment |
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