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typelib You can provide equivalents for all these types, but you won't get seamless integration Let's start with LPWSTR and LPSTR LPWSTR and LPSTR are just pointers to NULL-terminated strings A BSTR is also a pointer to a NULL-terminated string, so you can replace the LPWSTR or LPSTR with BSTR and just treat the field as a normal string (LPWSTR) or assign the value with StrConv(, vbFromUnicode) for an LPSTR This simple modification works very well for structures that you use as input parameters, but it is disastrous if the called function modifies the input structure or is responsible for populating it in the first place In such an instance, you should simply change the type to long instead of LPWSTR or LPSTR and use the SysAllocString* functions to turn the string pointer into a VB-readable BSTR When you use fixed-length string fields, you must use an embedded array of type short (Integer in VB) for UNICODE strings or type unsigned char (Byte in VB) for ANSI strings Then you need to copy the data to and from the structures yourself using CopyMemory Such a technique is not pretty, and it is a miserable use of memory But it is feasible

That is a considerable amount of information being viewed by a person that just happens to be in the area and decides to take a look at what is passed over the public Wi-Fi hotspot. Another interesting program is called Driftnet. This program is somewhat similar to URLSnarf, although Driftnet actually captures and displays image files as they are being sent to the PDA. Figure 6.15 shows the Driftnet command options and the Driftnet window that captured a few images from the user, who followed a link to go to http://billoreilly.com.

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'VB type Public Type FLStringField TheString As String * 38 End Type 'Typelib equivalent, UNICODE record TLibFLStringField { short[38] TheString; } TLibFLStringField; 'Calling code, UNICODE Dim FLSF As TLibFLStringField Dim strData As String Dim cBytes As Long 'Write to the field cBytes = LenB(strData) If cBytes > 38 Then cBytes = 3 8 CopyMemory FLSFTheString(0), ByVal strData, cBytes 'Read from the field strData = SysAllocString(VarPtr(FLSFTheString(0)))

Both URLSnarf and Driftnet are freely available on the Internet. This means that anyone with a bit of technical knowledge would be able to utilize these applications at their whim. The next application is where it gets really interesting.

A client invokes a remote operation. The REQUESTOR puts the bytes of the invocation on the wire, as in FIRE AND FORGET, but then waits for a reply from the server application as an acknowledgment that the invocation has been received by the server.

E E E In the SYNC WITH SERVER pattern, as in FIRE AND FORGET, no return value or out parameters of the remote operation are sent back to the client. The reply sent by the server application is only to inform the REQUESTOR about successful reception of the request. If the distributed object middleware supports SYNC WITH SERVER operations, the SERVER REQUEST HANDLER can send an acknowledgment message immediately after reception of the invocation. Alternatively, if only synchronous invocations are supported, SYNC WITH SERVER can be emulated at the application level inside the operations of the remote object. The operation of the remote object spawns a new thread that performs the actual invocation, while the INVOKER thread that initially invoked the operation returns immediately and returns an acknowledgement back to the client. Compared with FIRE AND FORGET, SYNC WITH SERVER operations ensure successful transmission, and thus make remote invocations more reliable. However, SYNC WITH SERVER incurs additional latency the client has to wait until the reply from the server application arrives. Note that the REQUESTOR can inform the client of system errors, such as failed transmission of the invocation. However, it cannot inform clients about application errors during the remote invocation in the remote object, because this happens asynchronously after the acknowledgement has already been sent to the server.

'Typelib equivalent, ANSI record TLibFLStringField { unsigned char[38] TheString; } TLibFLStringField; 'Calling code, ANSI Dim FLSF As TLibFLStringField Dim strData As String Dim strDataA As String Dim pStringA As Long Dim cBytes As Long

Utilizing a Palm or Pocket PC at a Wi-Fi hotspot, obviously, doesn t limit a user to simply surfing the Internet. Enterprise users will want to check their email and even communicate via instant messaging (IM). As with the previous examples, this information can be viewed by those with malicious intent. It s always interesting to think about the type of information that gets sent over IM. More often than not, sensitive information is not being sent out maliciously, for example, by a disgruntled user s attempt to get back at his company. Rather, lots of business is simply done by IMing coworkers. Nonetheless, sensitive information is bound to get communicated. Figure 6.16 is an instant messaging session between a user at the airport on a Pocket PC and a coworker back at the office.

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'Write to the field strDataA = StrConv(strData, vbFromUnicode) cBytes = LenB(strData) If cBytes > 38 Then cBytes = 38 CopyMemory FLSFTheString(0), ByVal strDataA, cBytes

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