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Declare functions are bound the first time they are called Forcing Windows to bind a large number of functions when the program launches has two disadvantages: It adds extra time to startup, and you can't even launch the executable if the DLL or the entrypoint can't be found Consult MSDN when you declare API functions in a typelib to make sure they are available on all the target platforms When you use typelib declarations, the DLL you call is locked in memory for the entire life of the program When you use a Declare statement, the DLL is locked as soon as the first function call made to it succeeds If you want to explicitly unload a DLL, either for memory reasons or to upgrade it dynamically, you need to perform your own LoadLibrary and FreeLibrary calls This is possible using a FunctionDelegator object (described in 11) Because a function delegator uses a typelib-defined function, you get the same type and HRESULT advantages as you do with a normal call Unfortunately, there is no way to force VB to make an explicit GetLastError call after the FunctionDelegator completes its call String Types Visual Basic's String variables are always BSTRs, but there are three string types in a typelib BSTR indicates BSTR, LPSTR indicates a NULL-terminated ANSI string, and LPWSTR indicates a NULL-terminated UNICODE string By specifying the exact string type, you can make the expected string type explicit and avoid using StrPtr with a ByVal Long just to make a UNICODE API call To specify that a function requires a NULL-terminated ANSI string, use an [in] LPSTR for a ByVal String and an [in,out] LPSTR* for a ByRef String equivalent VB takes care of all remaining ANSI/UNICODE conversion You can also use LPWSTR to indicate a NULL-terminated UNICODE string that needn't be a length-prefixed BSTR All three string types are displayed As String in the Object Browser and IntelliSense windows, [out] LP[W]STR* parameters are handled slightly different than [out] BSTR* parameters: The BSTR passed to these parameters is considered a required output buffer and is not freed before the function call If you need a string type in a typelib-declared structure, you get to do some extra work A BSTR is the only string-type VB can handle in a record LPWSTR and LPSTR don't compile, and there is no way to define a fixed-length string in a.

can only be used if the client can really afford to take the risk of not noticing that a remote invocation has not reached the targeted remote object. The other extreme is a synchronous invocation, in which a client is blocked until the remote method has executed successfully and the result returned. Sometimes a balance between these extremes is needed. Consider a system that stores images in a database. The images are filtered before the images are stored in the database, for example using a Fourier transformation, which may take a long time. The client is not interested in the result of the transformation, only in a notification that it has been delivered as a message to the server. The client therefore does not need to block and wait for the result it can continue executing as soon as the invocation has reached the remote object. In this scenario the client only has to ensure that the invocation containing the image is transmitted successfully. From that point onwards it is the responsibility of the server application to ensure that the image is processed correctly and stored safely in the database. Therefore:

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IP Address of the device surfing the Internet (192.168.1.17) Type of device surfing the Internet (Windows CE or PPC) The URLs visited by that device (www.yahoo.com, www.foxnews.com)

Provide SYNC WITH SERVER semantics for remote invocations. The client sends the invocation, as in FIRE AND FORGET, but waits for a reply from the server application informing it about the successful reception (but not the execution) of the invocation. After the reply is received by the REQUESTOR, it returns control to the client and execution continues. The server application executes the invocation independently.

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