๐Ÿ”ฅ A references, guides and tutorials on the mailslot programming with the Winsock 2 and C code

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A Mailslot is a one-way interprocess communication mechanism, available on the Microsoft Windows operating system, that allows communication between.


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About Mailslots - Win32 apps | Microsoft Docs
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Mailslots - Win32 apps | Microsoft Docs
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Platform and Performance Considerations. Mailslots on Windows 95, Windows 98, and Windows Me platforms have three limitations that you should be aware ofโ€‹.


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A single mailslot is a one-way communication mechanism only; the process that creates the mailslot is referred to as the server. A client.


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Mailslot Implementation Details. Mailslots are designed around the Windows file system interface. Client and server applications use standard Win32 file system I/โ€‹.


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Platform and Performance Considerations. Mailslots on Windows 95, Windows 98, and Windows Me platforms have three limitations that you should be aware ofโ€‹.


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How to create mailslots. Mailslots are supported by three specialized functions: CreateMailslot, GetMailslotInfo, and SetMailslotInfo.


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Mailslot Implementation Details. Mailslots are designed around the Windows file system interface. Client and server applications use standard Win32 file system I/โ€‹.


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SMB MailSlot Protocol (Mailslot). The Mailslot protocol is part of the SMB protocol family. A mailslot is a (temporary) RAM-based file to which.


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A mailslot is a pseudofile that resides in memory, and you use standard file functions to access it. The data in a mailslot message can be in any.


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The automated test verifies basic Mailslot File System (MSFS) functionality: creating and opening mailslots, reading and writing messages of.


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This might simply be a name, or a full directory path might precede it. We'll examine mailslot names in greater detail later in this chapter, when we cover implementation details of a simple client. Read operations can operate in blocking or nonblocking mode on a mailslot, depending on the lReadTimeout parameter, which determines the amount of time in milliseconds that read operations wait for incoming messages. The lpOverlapped parameter provides a way to read data asynchronously off a mailslot. The biggest advantage of mailslots is that they allow a client application to easily send broadcast messages to one or more server applications. H include file in your program files. The following steps describe how to write a basic client application:. The mailslot name can be summarized as in the following Table. After a mailslot is created with a valid handle, you can begin reading data. All Win32 API functions that are used in developing mailslot client and server applications except for CreateFile and CreateMailslot return the value 0 when they fail. Transfer Direction. One possible scenario for using mailslots is developing a messaging system that includes everyone in your office. Table outlines these message size limitations in detail. When mailslots communicate remotely to computers across a network, the Windows file system services rely on the Windows redirector to send data from a client to a server using the SMB protocol. The following code further demonstrates how to write a simple mailslot server application. Mailslots, therefore, only partially follow the Windows NT security model found in the standard file systems. When these API functions fail, applications should call the GetLastError function to retrieve specific information about the failure. The first parameter, lpName, specifies the name of the mailslot. Retrieves a client handle to a remote mailslot. For example, if you send a large message from a client to a server that does not exist on a network, the mailslot interface does not tell your client application that it failed to submit data to the server. Messages must be bytes or less. ReadFile is defined as follows:. The office is suffering from a soda shortage, and every workstation user in your office is interested in knowing every few minutes how many sodas are available in the vending machine. Because mailslots rely on the Windows file system services for creation and transferring data over a network, the interface protocol is independent. If you specify 0, read operations return immediately. Retrieves a client handle to all mailslots with the specified name in the specified domain. They can be useful, nevertheless, in certain types of network programming situations in which delivery of data isn't mission-critical. Table Mailslot Name Formats. Imagine that your office environment has a large number of workstations. The name must have the following form:. As you can see, very few API calls are needed to develop a mailslot server application. A client can get around this security by specifying the server's actual name instead of a dot. Another limitation of Windows NT platforms is worth discussion because it affects datagram data transmissions. You can easily implement a mailslot client application that monitors the soda count and broadcasts to every interested workstation user the total number of available sodas at five-minute intervals. The Windows NT redirector cannot send or receive a complete datagram message of or bytes. The nMaxMessageSize parameter defines the maximum size, in bytes, of a message that can be written to a mailslot. We'll describe mailslot naming conventions before we address the message sizing considerations that control the overall behavior of mailslots. Notice that the server name is represented as a dot, which represents the local machine. If a client writes more than nMaxMessageSize bytes, the server doesn't see the message. Messages must be greater than bytes. This is unreliable data transmission, so you cannot guarantee message delivery. Because Windows NT platforms change their transmission method based on message size, an interoperability problem occurs when you send large messages between a machine running Windows NT and a machine running Windows 95, Windows 98, or Windows Me. Datagrams are small packets of data that are transmitted over a network in a connectionless manner. To accomplish total interoperability among all Windows platforms, we strongly recommend limiting message sizes to bytes or less. Connection-oriented transfers are limited to one-to-one communication: one client to one server. Mailslots are designed around the Windows file system interface. As we described earlier, mailslot clients communicate to mailslot servers in a connectionless manner.{/INSERTKEYS}{/PARAGRAPH} On Windows NT platforms, messages larger than bytes are transferred using a connection-oriented protocol over an SMB session instead of using datagrams. Messages are typically sent via connectionless transfers, but you can force the Windows redirector to use connection-oriented transfers on the Windows NT platform, depending on the size of your message. Retrieves a client handle to all mailslots with the specified name in the system's primary domain. When creating your application, you don't have to worry about the details of underlying network transport protocols to form communications among processes across a network. The server should use the Win32 ReadFile function to accomplish this. Mailslots normally use datagrams to transmit messages over a network. Table Mailslot Message Size Limitations. The following steps describe how to write a basic server application:. Connectionless Transfer Using Datagrams. Remember that Windows 95, Windows 98, and Windows Me receive data via datagrams only. {PARAGRAPH}{INSERTKEYS}In simplest terms, mailslots allow a client process to transmit or broadcast messages to one or more server processes. Also note that messages sized to bytes are not listed in this table due to a Windows NT redirector limitation. However, connectionless transmission does give you the capability to broadcast a message from one client to many servers. A few transmission failures won't be a problem in this case because messages sent at five-minute intervals with occasional misses are still frequent enough to keep the workstation users well informed. For example, the following types of names are legal for identifying a mailslot:. Windows 95, Windows 98, and Windows Me platforms deliver messages using datagrams only, regardless of message size. Message size up to 64 KB. Specifying the value 0 allows the server to accept a message of any size. In the lpName parameter, name must represent a unique name. Windows CE was intentionally left out of Table because the mailslot-programming interface is not available. Not supported. Because mailslots are designed around a broadcast architecture , you can't expect reliable data transmissions using mailslots. However, you lose the ability to broadcast a message from a client to many servers. Mailslot clients are processes that open instances of mailslots and are the only processes that can write data to them. At the end of this chapter, we'll tell you about known problems and limitations of mailslots and offer workaround solutions. Messages must be bytes or less; otherwise, the message is truncated. The server is responsible for creating a mailslot and is the only process that can read data from it. This allows large messages to be transferred reliably and efficiently. Retrieves a client handle to a local mailslot. Mailslots use the following naming convention for identification:. The major limitation of mailslots is that they permit only unreliable one-way data communication from a client to a server. CreateMailslot returns the handle hFile. If a client running one of these operating systems attempts to send a message larger than bytes to a Windows NT platform, Windows NT will accept the first bytes and truncate the remaining data. We discuss details of reading later in this chapter. A domain is simply a group of workstations and servers that share a common group name. The server is the only process that can read data from a mailslot. The lpSecurityAttributes parameter determines access control rights to a mailslot. Connection-oriented transfers normally provide reliable guaranteed delivery of data between processes, but the mailslot interface on Windows NT platforms does not guarantee that a message will actually be written to a mailslot. This is required because you cannot create a mailslot on a remote computer. Connection- Oriented Transfer. As a consequence, any mailslot client on your network can send data to your server. Mailslots lend themselves well to this type of situation. Because Windows NT transfers data via datagrams for messages bytes or smaller, Windows 95, Windows 98, and Windows Me cannot receive messages larger than bytes from such clients. Mailslots can assist transmission of messages among processes on the same computer or among processes on different computers across a network. Connectionless transmission means that each data packet is sent to a recipient without packet acknowledgment. Implementing a mailslot requires developing a server application to create a mailslot. The data communication model is one-way, or unidirectional. If you are looking for connection-oriented transfers, consider using named pipes instead of mailslots. The exception to this occurs on Windows NT platforms when messages exceed bytes. The server string portion can be represented as a dot. Implementing a client requires developing an application to reference and write to an existing mailslot. Because mailslots don't guarantee delivery of a broadcast message, some workstation users might not receive all updates.