QTcpSocket does not send data immediately

[igorosberg]

Hello everyone,

could someone tell me the reason for the code below does not send the data? I think that the data is being buffered, rather than sent

QByteArray data;
 
	int type_msg = 6;
	data.append( (char*)&type_msg, sizeof(int) );
 
	string video_server_address;
	in >> video_server_address;
 
	int num_char_video_server_address = video_server_address.size();
	data.append( (char*)&num_char_video_server_address, sizeof(int) );
 
	data.append( QString(video_server_address.c_str()) );
 
	int num_bytes_write = clientSocket->write( data.data(), data.size() );
	clientSocket->flush();
 
	while( clientSocket->bytesToWrite() > 0 ){
		num_bytes_write += clientSocket->write( data.data()+num_bytes_write, data.size()-num_bytes_write );
		clientSocket->flush();
		clientSocket->waitForBytesWritten();
	}

QByteArray data;
		
	int type_msg = 6;
	data.append( (char*)&type_msg, sizeof(int) );
	
	string video_server_address;
	in >> video_server_address;
	
	int num_char_video_server_address = video_server_address.size();
	data.append( (char*)&num_char_video_server_address, sizeof(int) );
	
	data.append( QString(video_server_address.c_str()) );
	
	int num_bytes_write = clientSocket->write( data.data(), data.size() );
	clientSocket->flush();

	while( clientSocket->bytesToWrite() > 0 ){
		num_bytes_write += clientSocket->write( data.data()+num_bytes_write, data.size()-num_bytes_write );
		clientSocket->flush();
		clientSocket->waitForBytesWritten();
	}

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before this code a lot of data has been sent successfully the same way, but these last 17 bytes were not received by the client

clientSocket is a variable whose type is QTcpSocket.

Thanks