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Mailslots and Microsoft LAN Manager 2.x
Windows uses mailslots similar to those developed for Microsoft LAN Manager
version 2.0. An application that uses LAN Manager 2.x mailslots can interact easily with mailslots created by Windows. There are
significant differences, however, between Windows-based mailslots and LAN Manager
mailslots:
- Windows-based mailslots all have the same class
 there are no "first class" and "second class" mailslots.
- All Windows-based mailslot messages have equal priority and are always
appended to the mailslot buffer. When a Windows-based mailslot message is written to a
mailslot on a computer that requires message priority, the system sets the
priority to the lowest value (0).
- Write operations to Windows-based mailslots on local computers return an error
value if an error occurs. Write operations to remote Windows-based mailslots
do not return an error value when they fail. (Because there is no built-in limit
to the size of the mailslot buffer failure is unlikely.)
- Write operations to Windows-based mailslots fail immediately if the message
cannot be appended to the mailslot buffer (if the buffer is too small, for
example). Immediate failure makes write time-outs irrelevant; contrary to LAN Manager
mailslots, there are no write time-outs for Windows-based mailslots.
- A process that creates a Windows-based mailslot can specify that the mailslot
handle be inherited by its child processes. (Mailslot handles in LAN Manager
cannot be inherited.)
A process writes messages to a Windows-based mailslot by using standard file
input and output functions. The following table shows LAN Manager mailslot
functions and their corresponding Windows functions.
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.Net is powerful, but not all-powerful, so sometimes we need to use Win32 API for our .Net applications. It's simple enough with Platform Invoke if you have Win32 skill, but we do not always have time to dig the ancient documentation, declare the special types that are compatible with Win32, find the values of the Win32's constants and so on. Nostalgia .Net offers several simple-to-use classes, and components that will allow you to forget about the headache of Win32 and just use the power of Win32 in your application the same way as you use the native. Net classes. More » |
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