PIC Microcontroller and Embedded Systems by Muhammad Ali Mazidi, Danny Causey, Rolin McKinlay

By Muhammad Ali Mazidi, Danny Causey, Rolin McKinlay

The PIC microcontroller from Microchip is likely one of the most generally used 8-bit microcontrollers on this planet. during this publication, the authors use a step by step and systematic method of convey the programming of the PIC18 chip. Examples in either meeting language and C convey tips to software the various PIC18 positive aspects akin to timers, serial conversation, ADC, and SPI.

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40 Threading Apartments Threading Apartments 41 Figure 2-24 A registry entry specifying the component's apartment requirements. The Both entry is misnamed; it really should be called Either. It tells COM that the object doesn't give a hoot which apartment it lives in: it is equally at home in an intimate studio with one thread or in the bunkroom with everyone. An object with this ThreadingModel entry is always created in the apartment of its creating thread. The component can specify which type of apartment it can live in, but it is up to COM to figure out at creation time exactly which apartment of that type the object will live in and which type of connection to the object, direct or marshaled, its creator will receive.

Thus only two outcomes of a transaction 46 Solution Architecture Simplest Transaction Example 47 would be possible—complete success or total failure. This approach is better than the previous example because the components are much, much easier to write—they don't have to know what any of the others are doing, just how to report to the DTC if they themselves are happy or sad. The DTC knows which other objects are participating in the transaction and coordinates the results among them. No one has to deal with intermediate failure states.

The IsSecurityEnabled method will tell you whether role-based security is turned on and the IsCallerInRole method will tell you whether the base client is a member of the role you specify. 34 Security Security 35 Figure 2-19 The process of programmatic role checking in COM+. Table 2-6 Selected ISecurityCallContext Interface Methods Method Description IsCallerInRole Indicates whether the direct caller of an object method is a member of the specified role IsSecurityEnabled Indicates whether COM+ security is turned on for this object The ISecurityCallContext interface also provides much more extensive security information.

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