network-programming

问题 I was only able to set maximum of 20 seconds as the timeout parameter in select () API. Whatever value i gave above 20, select() is returning after 20 seconds itself... So i was trying to write a loop for the timeout of 1 minute like this int timeoutcount = 0; do { FD_ZERO(&fd); FD_SET(sock,&fd); timeout.tv_sec = 20; timeout.tv_usec = 0; rc = select (sock+1,&fd,null,null,&timeout); if(rc ==0) timeoutcount += 20; } while(rc ==0 && timeoutcount <60) please help me out...am i going in the

问题 I was only able to set maximum of 20 seconds as the timeout parameter in select () API. Whatever value i gave above 20, select() is returning after 20 seconds itself... So i was trying to write a loop for the timeout of 1 minute like this int timeoutcount = 0; do { FD_ZERO(&fd); FD_SET(sock,&fd); timeout.tv_sec = 20; timeout.tv_usec = 0; rc = select (sock+1,&fd,null,null,&timeout); if(rc ==0) timeoutcount += 20; } while(rc ==0 && timeoutcount <60) please help me out...am i going in the

问题 I was only able to set maximum of 20 seconds as the timeout parameter in select () API. Whatever value i gave above 20, select() is returning after 20 seconds itself... So i was trying to write a loop for the timeout of 1 minute like this int timeoutcount = 0; do { FD_ZERO(&fd); FD_SET(sock,&fd); timeout.tv_sec = 20; timeout.tv_usec = 0; rc = select (sock+1,&fd,null,null,&timeout); if(rc ==0) timeoutcount += 20; } while(rc ==0 && timeoutcount <60) please help me out...am i going in the

问题 I am trying to set some advanced properties for Network adapter e.g. Jumbo Packet, Receive/Transmit Buffers. I tried with Win32_NetworkAdapter, Win32_NetworkConnection, Win32_NetworkAdapterConfiguration WMI classes. None of them can do that. Can anyone help me? 回答1: "Jumbo Packet" support just means a big MTU (typically 9000 bytes). Maybe the SetMTU method of the Win32_NetworkAdapterConfiguration class, or the SetIFEntry() function (see the dwMtu field). The size of the transmit and receive

问题 I am trying to set some advanced properties for Network adapter e.g. Jumbo Packet, Receive/Transmit Buffers. I tried with Win32_NetworkAdapter, Win32_NetworkConnection, Win32_NetworkAdapterConfiguration WMI classes. None of them can do that. Can anyone help me? 回答1: "Jumbo Packet" support just means a big MTU (typically 9000 bytes). Maybe the SetMTU method of the Win32_NetworkAdapterConfiguration class, or the SetIFEntry() function (see the dwMtu field). The size of the transmit and receive

问题 I'm required to start a series of python scripts and/or other windows executables. Some of these require a Windows system, others require a Linux machine. Currently there are designated machines to run the OS-dependent programs. So I know where I want to start which program. Is there a way to start a python script (or a windows executable) from a python script, on the local network, on another computer (e.g. run 192.168.0.101:/dir/python_script_123.py ? The script, which should then run

问题 I can find any documentatin anywhere and would like to know what would be the best method of send multiple messages as fast as possible. for example if I had 300 devices recieivng messages from one server would it be better to send out one big message and have the devices pick out the parts that they need or send 300 messages but at 1/300 of the size. They would only be small stings so the 300 devies would only be getting 6 bytes each Does it make a difference? Thanks in advanced. 回答1: If the

问题 I want to setup my computer to run certain commands when I join or leave certain networks (ie: Start up Synergy when at work; Start up ssh when on the lan at home so I can sync, etc...). I found iwevent which outputs events to the wireless interface that I can watch. However I can't find an equivalent to watch when eth0 is connected or disconnected. I tried ip monitor but there's so much data outputted I can't make use of it sanely. Is there any command I can use to monitor state changes to

问题 I've begun using Boost.ASIO for some simple network programming, my understanding of the library is not a great deal, so please bear with me and my newbie question. At the moment in my project I only have 1 io_service object. Which use for all the async I/O operations etc. My understanding is that one can create multiple threads and pass the run method of an io_service instance to the thread to provide more threads to the io_service . My question: Is it good design to have multiple io_service

问题 I've begun using Boost.ASIO for some simple network programming, my understanding of the library is not a great deal, so please bear with me and my newbie question. At the moment in my project I only have 1 io_service object. Which use for all the async I/O operations etc. My understanding is that one can create multiple threads and pass the run method of an io_service instance to the thread to provide more threads to the io_service . My question: Is it good design to have multiple io_service