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'See next paragraph VBoostAssignZero ByVal pData 'Fill Data VBoostAssignSwap ByVal pData, _ ByVal VarPtrArray(Data) End If End Function Although the next problem is theoretically an issue, I haven't actually seen it in practice Unlike an [in, out] parameter, an [out] parameter provides no guarantee that it will receive a properly initialized value With an [in, out], the pointer and the data it contains must be valid The pointer for an [out] parameter is guaranteed to be valid or zero, but the data is undefined If you leave this data undefined and use VB to assign to the parameter, you might free undefined data and crash the program For example, if an incoming String parameter contains garbage data, assigning new data to that parameter frees the bad data To account for this state, I always explicitly zero out any [out] parameters at the top of the function VB also zeroes these values before the call, and the typelib-driven marshaling code does as well This is done as a courtesy by the calling code, and it comes with no guarantee

Another drawback of concurrent invocations is that an older invocation may bypass a more recent one As FIRE AND FORGET operations do not have to be reliably transported, an option is to use unreliable protocols such as UDP for their implementation UDP is much cheaper than reliable protocols such as TCP The server-side distributed object middleware, primarily the INVOKER, differentiates between operations that do not require a reply, such as FIRE AND FORGET operations, and synchronous operations that do require a reply For synchronous operations a reply is sent even if it has no return value When the remote invocation is performed in a separate thread, a thread pool can be used instead of spawning a new thread for each invocation, to avoid thread creation overhead.

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The inclusion of Wi-Fi technology in Palm devices and Pocket PCs has been a tremendous convenience. Wi-Fi hotspots are pretty much everywhere, which means that access to the Internet is pretty much everywhere. To understand the exploits to utilizing Wi-Fi in a public Wi-Fi hotspot, it is important to understand what is actually happening. First, the data leaving the PDA is connecting to an access point at the hotspot. That access point is then connected to the Internet. Figure 6.13 is a diagram depicting this topology.

If the distributed object middleware does not provide FIRE AND FORGET operations, the client application can emulate such behavior by spawning a thread itself and performing the invocation in that newlycreated thread Be aware, however, that such an emulation heavily influences scalability In particular, many concurrent requests lead to many concurrent threads, decreasing overall system performance The benefit of the FIRE AND FORGET pattern is the asynchrony it provides compared to synchronous invocations Client and remote object are.

HRESULT Returns on API Calls When you use the VB's Declare statement, you can't control the type of error handling VB produces for the function call With a Declare function, VB always calls the GetLastError API and stores the value in ErrLastDIIError after you call a Declare function There are several disadvantages to this approach First, there is the overhead of this extra call, which adds approximately 15 to 20 percent to the overhead of calling a declared function Second, many functions return an HRESULT value directly to specify an error condition rather than using the SetLastError/GetLastError mechanism to return failure information Third, functions that return an HRESULT need to be declared with a Long return value, which then needs to be explicitly checked after the function call Unfortunately for Declare statements, HRESULTs are the basis of VB's builtin error-handling mechanism You can make use of this error-handling mechanism by using a module section in a typelib in place of a Declare statement Typelibs let you declare an HRESULT return type and explicitly determine

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