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created This constraint means that the user must load the DeadlockDetection DLL into her address space, a requirement that isn't too harsh given the benefits As a DLL, the utility would integrate easily with a user program, requirement 7 specified in the list in the preceding section As you're looking over Table 15-1, you might have noticed that I didn't include certain potentially blocking message functions such as SendMessage, PostMessage, and WaitMessage Originally, I'd intended to include these functions, but when I ran Charles Petzold's canonical "Hello World!" GUI program under DeadlockDetection, DeadlockDetection reported so many calls that the program essentially fell over In the effort of keeping DeadlockDetection as lightweight as possible, I had to forego them Gathering the information to satisfy requirements 1 through 4 follows as a direct consequence of choosing the in-process function hooking approach.

VirtueMart has a powerful shipping system implementation. Not only are a large number of shippers preconfigured (see Figure 11-20), but the user interface allows a great deal of specific parameter settings to precisely reflect how the shipping is figured.

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This approach means that each of the multithreading and synchronization functions will be calling directly into the DeadlockDetection code with all the information I need Making DeadlockDetection as lightweight as possible (requirement 5) was a tough condition to satisfy I tried to code efficiently, but efficient code went only so far toward fulfilling the goal I set out to achieve Figuring that you know best what types of synchronization objects you're using in your program, I grouped the object types so that you can specify just those functions you want to hook For example, if you're concerned only about deadlock problems on mutexes, you can process only mutex functions To make DeadlockDetection even more useful, you can specify, on the fly, which sets of synchronization object functions you want to watch You can also turn DeadlockDetection on and off as many times as needed.

You might even want to give your application an accelerator key or a special menu option that toggles the entire DeadlockDetection system Allowing this narrow scope meets requirement 5 and helps with requirement 7 The only requirement left is number 6: making the output processing as extensible as possible I wanted to give you the ability to slice and dice the output, rather than force you to make do with some arbitrary, hard-coded format By keeping the main hooking and processing separate from the output code, I can achieve greater code reuse because the only part being changed, the output side, is much easier to develop than the core side I named the output portions DeadlockDetection extensions, or DeadDetExt for short A DeadDetExt is simply a DLL that has several exported functions that DeadlockDetection looks for and calls when appropriate Now it's time to explain how to use DeadlockDetection.

If you understand the requirements I set out and understand how to use this utility, you'll find it easier to see how I implemented it Using DeadlockDetection The first step in using DeadlockDetection is to put DEADLOCKDETECTIONDLL, its initialization file, and the appropriate DeadDetExt DLL in the same place The initialization file is a simple INI file that, at a minimum, must specify the name of the DeadDetExt file to load The following sample is a DEADLOCKDETECTIONINI file that loads the supplied TEXTFILEDDEXTDLL: [Initialization] ; The only mandatory value, the name of the DeadDetExt file that will ; handle the output 539.

attempts (for example, through maliciously named objects) .

If you have four DLLs in your application, APPLE.DLL, DUMPLING.DLL, GINGER.DLL, and GOOSEBERRIES.DLL, you run REBASE.EXE three times to get all the DLLs rebased appropriately. The following three commands show how to run REBASE.EXE with those DLLs: REBASE /b 0x60000000 APPLE.DLL REBASE /b 0x61000000 DUMPLING.DLL REBASE /b 0x62000000 GINGER.DLL GOOSEBERRIES.DLL If multiple DLLs are passed on the REBASE.EXE command line, as shown here with GINGER.DLL and GOOSEBERRIES.DLL, REBASE.EXE will rebase the DLLs so that they are loaded back to back starting at the specified starting address. The other method of rebasing a DLL is to specify the load address when you link the DLL. In Visual C++, specify the address by selecting Linker folder, Advanced property page in the project Property Pages dialog box. The Base Address field is where you'll set the hexadecimal address. The address will be used with the /BASE switch passed to LINK.EXE. Figure 2-9 shows where you set the base address.

B. Incorrect: The product lines are not rectangular, so this would not be an option. c. Incorrect: The MultiView control only shows one View at a time, so this would not be a

In this exercise, you configure a web form that allows a user to either log on with a user name and password or to access the site as a guest by using an email address. If the user chooses to log on as a registered user, he or she should be prompted for both a user name and a password. If the user chooses to log on as a guest, he or she should be prompted for an email address only.

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