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Despite the fact the protocol is not documented by Microsoft, plenty of references are available to help build a good enough understanding of this protocol to be proficient in debugging it The history of LPC dates back to the first days of the Windows NT operating system, when the client-server architecture used at the core of the operating system called for a new communication protocol meeting strong performance requirements The LPC protocol is supported by a suite of APIs implemented directly by the Windows kernel and exposed to user mode code by a series of functions implemented inside ntdlldll, having the ntdll!Nt[operation]Port form To understand how the protocol is used, engineers must have a basic idea about its behavior The basic communication happens in several important steps, as follows 1 The server initiates the protocol with the creation of a named port by calling the ntdll!NtCreatePort API The port is called the connection port 2 The server listens on that connection port for new communication requests using the ntdll!NtListenPort API The server must have a thread waiting on the connection port all the time 3 The client initiates a new connection by sending a connection request to the server by using the ntdll!NtConnectPort API The request is sent to the port created in step 1 4 The server examines the connection request and, based on its policies, accepts the connection by using the ntdll!NtAcceptConnectPort API followed by a ntdll!NtCompleteConnectPort call 5 After the connection has been established, both the client and the server are in possession of a communication port object that can be used for actual communication 6 The server starts a loop dedicated to the connection port in which it receives a new message, processes the message, and replies to the client using, for example, the ntdll!NtReplyWaitReceivePort API 7 The lient uses ntdll!NtRequestWaitReplyPort to send a new request to the server and waits for the server to process it Step 6 and step 7 repeat for the duration of the entire conversation between the client and the server. winforms barcode reader diff between barcode scanner & KeyBoard - CodeGuru Forums
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