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0x0065,c szHiWorld,s szWHiWorld,su 0x00000000,hr 0x00000040,wc
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'e' "Hello world" "Hello world" S_OK WC_DEFAULTCHAR (Note that although documented, this format doesn't work in Visual Studio .NET.) WM_CLOSE
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Table 7-3: Formatting Symbols for Watch Window Memory Dumps Symbol ma Format Description 64 ASCII characters Sample 0x0012ffac,ma Display 0x0012ffac .4...0...".0W&.......1W&. 0.:W..1...."..1.JO&.1.2.. " ..1...0y....1 0x0012ffac b3 34 cb 00 84 30 94 80 ff 22 8a 30 57 26 00 00 .4...0...".0W&..
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16 bytes in hexadecimal format followed by 16 ASCII characters
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Table 7-3: Formatting Symbols for Watch Window Memory Dumps Symbol mb Format Description 16 bytes in hexadecimal format followed by 16 ASCII characters 8 words Sample 0x0012ffac,mb Display 0x0012ffac b3 34 cb 00 84 30 94 80 ff 22 8a 30 57 26 00 00 .4...0...".0W&.. 0x0012ffac 34b3 00cb 3084 8094 22ff 308a 2657 0000 0x0012ffac 80943084 00002657 00cb34b3 308a22ff
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0x0012ffac 8094308400cb34b3 00002657308a22ff 0x0012ffac 34b3 00cb 3084 8094 22ff 308a 2657 0000 . . Expanded array of 10 characters using +/expanders
2-byte (Unicode)
characters
0x0012ffac,mu
Expands a pointer to a memory location to the specified number of values
pCharArray,10
The number format specifier ,# allows you to expand a pointer to a memory location to a specified number of values. If you have a pointer to an array of 10 longs, the Watch window will show only the first value. To see the entire array, follow the variable with the number of values you'd like to see. For example, pLong,10 would show an expandable array of your 10 items. If you have a large array, you can point to the middle of it and expand just the values you want with, for example, (pBigArray+100),20, to show the 20 elements starting at offset 99. You'll notice that when you enter a value such as this, the index values always begin at 0, regardless of the position of the first displayed element. In the pBigArray example, the first index will be shown as 0 even though it's the 100th array element. The second index, the 101st array element, will be shown as 1, and so on. In addition to allowing you to format the data as you'd like it, the Watch window allows you to cast and cajole your data variables so that you can see exactly what you need to see. For example, you can use the BY, WO, and DW expressions to get at pointer offsets. To see the current thread ID in the Watch window, you could use DW($TIB+0x24). The addressof operator (&) and the pointer operator (*) are also allowed, and both allow you to get the values at memory addresses and to see the results of casts in your code. One great trick I like to use in my native debugging is watching variable values up the stack. Sometimes you have a local variable you'd like to keep an eye on as you're stepping through other functions. With the advanced breakpoint syntax context portion, which I discussed in the "Advanced Breakpoint Syntax" section earlier in this chapter, you can explicitly watch a value. For example, if you have a variable szBuff declared in the function CopyDatabaseValue, located in source file FOO.CPP in module DB.DLL, you'd specify the exact value of szBuff as 248
{CopyDatabaseValue,FOO.CPP,DB.DLL}szBuff. Now, no matter where you are inside functions called by CopyDatabaseValue, you can easily keep an eye on szBuff. Timing Code in the Watch Window Here's another neat trick using the Watch window to time code. The $CLK pseudoregister can serve as a rudimentary timer. In many cases, you want just a rough idea of the time between two points, such as how long a call to the database took. $CLK makes it easy to find out how long the call took. Keep in mind that this time includes the debugger overhead. The trick is to enter two $CLK watches, the first being just $CLK and the second $CLK=0. The second watch zeros out the timer after you start running again. Although not a perfect timer, $CLK is good enough for some ballpark guesses. The Undocumented Pseudoregisters Two new pseudoregisters have shown up in Visual Studio .NET. Since the word undocumented is in the title of this section, I have to warn you that these values might disappear in future versions of the debugger. The first pseudoregister is $HANDLES. This shows the number of open handles in the current process. This is a killer idea that allows you to keep an eye on handle leaks as you're debugging. If you see the number reported by $HANDLES creeping up, you know you have a leak. $HANDLES,d has a permanent place in my Watch window because it's so amazingly useful. The second undocumented pseudohandle is $VFRAME, a great feature for helping track down the stack in release builds. $VFRAME is short for virtual frame pointer. On IA32 machines, $VFRAME points to the next stack frame so that you can use it to help walk the stack back manually. If you're using standard stack frame, $VFRAME points to the previous item's EBP value. Expanding Your Own Types Automatically Although managed C++ and C# debugging allows you to expand your own types in the Watch window, the autoexpansion offered by native debugging takes this ability to new heights. In fact, starting with Visual Studio .NET 2003, the Watch window and data tips now attempt to show you the first few members of structures and classes automatically. However, you've probably seen a few common types, such as CObject, RECT, and some of the STL types, expand in the Watch window with even more information, which all happens to be provided by the autoexpand rules. The magic happens in the AUTOEXP.DAT text file located in the <Visual Studio .NET installation directory>\ COMMON7\PACKAGES\DEBUGGER subdirectory. You can add your own types to the autoexpand list by entering them into the AUTOEXP.DAT file. (Unfortunately, the AUTOEXP.DAT file must reside in that directory, so you'll have to set your version control software's working directory to pull AUTOEXPAND.DAT to that directory.) As an example, I'll add an autoexpand entry for the PROCESS_INFORMATION structure that is passed to the CreateProcess API function. The first step is to check what the Visual Studio .NET debugger recognizes as the type. In a sample program, I put a PROCESS_INFORMATION variable in the Watch window and looked at the Type column on the right side of the Watch window. The type was _PROCESS_INFORMATION, which if you look at the following structure definition, matches the structure tag. typedef struct _PROCESS_INFORMATION { HANDLE hProcess; HANDLE hThread; 249
DWORD dwProcessId; DWORD dwThreadId; } PROCESS_INFORMATION The documentation in AUTOEXP.DAT says that the format for an autoexpand entry is type=[text]<member[,format]>.... Table 7-4 shows the meanings for each field. Note that more than one member can be displayed as part of the autoexpand.
Table 7-4: AUTOEXP.DAT Autoexpand Entries Field Type Text member Description The type name. For template types, this field can be followed by <*> to encompass all derived types. Any literal text. This field is generally the member name or a shorthand version of it. The actual data member to display. This field can be an expression, so if you need to add some offsets to various pointers, you can include the offsets in the calculation. The casting operators also work. Additional format specifiers for the member variables. These specifiers are the same as the formatting symbols shown in Table 72.
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