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Now that you know how to get this information, let s discuss how you would set this information . The IFormatter interface (which is implemented by both the BinaryFormatter and the SoapFormatter types) defines a read/write StreamingContext property called Context . When you construct a formatter, the formatter initializes its Context property so that StreamingContextStates is set to All and the reference to the additional state object is set to null . After the formatter is constructed, you can construct a StreamingContext structure using any of the StreamingContextStates bit flags, and you can optionally pass a reference to an object containing any additional context information you need . Now, all you need to do is set the formatter s Context property with this new StreamingContext object before calling the formatter s Serialize or Deserialize methods . Code demonstrating how to tell a formatter that you are serializing/deserialzing an object graph for the sole purpose of cloning all the objects in the graph is shown in the DeepClone method presented earlier in this chapter .

This query generates the following output:

Due to the nature of the information that will be stored, you need two data tables: orders and order_detail. The orders table stores information regarding the order as a whole, while order_detail contains the products that belong to each order.

Summary

{ public DataSet GetSalesReport(int year); } For example, the NorthwindService class shown here is ideally suited to act as a remote console that clients access through transparent proxies. Note When creating a remotable object, you normally limit the class to inheriting from MarshalByRefObject. In some situations, however, you might want to override some of the parent class's methods. In particular, you might want to replace the InitializeLifetimeService method and configure the object's lifetime. We'll return to this topic in the section "Memory Management," on page 551.

USE tempdb; IF OBJECT_ID('dbo.Events', 'U') IS NOT NULL DROP TABLE dbo.Events; IF OBJECT_ID('dbo.Rooms', 'U') IS NOT NULL DROP TABLE dbo.Rooms; GO CREATE TABLE dbo.Rooms

expression in the assertion message box so that you at least have an idea of what failed without looking at the source code The following example shows the proper way to assert a false condition: // Proper assertion usage BOOL CheckDriveFreeSpace ( LPCTSTR szDrive ) { ULARGE_INTEGER ulgAvail ; ULARGE_INTEGER ulgNumBytes ; ULARGE_INTEGER ulgFree ; if ( FALSE == GetDiskFreeSpaceEx ( szDrive &ulgAvail &ulgFree { ASSERT ( !"GetDiskFreeSpaceEx failed!" ) ; return ( FALSE ) ; } } You can also extend Dave's assertion trick by using the logical AND conditional operator (&&) to perform a normal assertion and still get the message text The following example shows how Note that when using the logical AND trick, you do not use the "!" in front of the string.

This is definitely true if the thread lives its whole life inside a single AppDomain (like in the ASP .NET and managed SQL Server stored procedure scenarios) . But you might have to terminate the whole process if a thread crosses AppDomain boundaries during its lifetime .

10

Summary

The module!symbol format supports wildcards, so, for example, if you want to see anything in KERNEL32.DLL with "lib" in the symbol name, x kernel32!*Lib* works great and is also case-insensitive. To see all the symbols in a module, use a single wildcard in place of the symbol name. Using only a wildcard as the parameter will show the local variables in the current scope, which is identical to the DV (Display Variables) command I'll discuss later in the chapter in the section "Looking at and Evaluating Variables." Processes and Threads With the symbol story behind us, I can now turn to the various means of getting processes running under WinDBG. Like Visual Studio .NET, WinDBG can debug any number of disparate processes at a time. What makes WinDBG a little more interesting is that you have better control over debugging processes spawned from a process being debugged. Debugging Child Processes If you look back at the Open Executable dialog box in Figure 8-2, you'll notice that the very bottom of the dialog box has a check box titled Debug Child Processes Also. By checking it, you're telling WinDBG that you also want to debug any processes started by debuggees. When running Microsoft Windows XP or Microsoft Windows Server 2003, if you forget to check that box when opening a process you can use the .CHILDDBG (Debug Child Processes) command to change the option on the fly. By itself, .CHILDDBG will tell you the 327

BOOL AddToDataTree ( PTREENODE pNode ) { ASSERT ( ( FALSE == IsBadReadPtr ( pNode , sizeof ( TREENODE) ) ) && "Invalid parameter!" } The VERIFY Macro Before we get into the various assertion macros and functions you'll encounter in Windows development as well as some of the problems with them, I want to talk about the VERIFY macro that's used quite a bit in Microsoft Foundation Class (MFC) library development In a debug build, the VERIFY macro behaves the same way as a normal assertion because it's defined to be ASSERT If the condition evaluates to 0, the VERIFY macro triggers the normal assertion message box to warn you In a release build, the VERIFY macro does not display a message box, however, the parameter to the VERIFY macro stays in the source code and is evaluated as a normal part of processing.