Microsoft(R) Debugging Tools for Windows(R)
DbgExts.dll DBGENG Sample Extension
README
Overview
This extension DLL shows how to write a debugger engine-style extension and
demonstrates use of a few APIs required by and provided to extension DLLs.
----------
Required and Optional Initialization
This mandatory routine must be implemented and exported for debugger engine
style extensions:
HRESULT
CALLBACK
DebugExtensionInitialize(PULONG Version, PULONG Flags)
This is called on loading of the extension DLL. Global variables and flags
for the extension should be initialized in this routine. One of the useful
things that is done in this routine is to initialize "ExtensionApis" as a
WINDBG_EXTENSION_APIS global variable from the lpExtensionApis parameter.
lpExtensionApis has pointers to some commonly used APIs for memory reads
and I/O.
This function should return the extension version in *Version. Flags is a
reserved parameter for future use and should be set to 0.
A debug session may not be active when the extension DLL is loaded so
initialization code here should not presume to be able to query for debug
session information.
All new dbgeng interface-style extensions can be identified by the
presence of the DebugExtensionInitialize export.
These next two routines are optional but it is recommended to implement these
routines in a debugger extension for better control of the debug session:
CALLBACK
DebugExtensionNotify(ULONG Notify, ULONG64 Argument)
This is used to notify the extension DLL of changes in debug session
states, e.g. when the session becomes accessible etc. Look at the
DEBUG_NOTIFY* definitions in dbgeng.h for argument values (active,
inactive, accessible, inaccessible).
Use of this function allows an extension to cache debug session related
info without needing to register explicit callbacks.
CALLBACK
DebugExtensionUninitialize(void)
This is called when a DLL is unloaded and can be used for cleanup related
code.
----------
Anatomy of an Extension Call
A debugger extension is a function with the following declared type:
HRESULT
CALLBACK
DebugExtensionCall(PDEBUG_CLIENT Client, PCSTR args)
Where "DebugExtensionCall" is an actual name of the extension being
implemented, such as "stack" for a !stack extension.
This is the recommended function prototype to use but, in reality,
extensions can use any prototype with one restriction - the function name
must begin with _EFN_ to distinguish the function as an extension function
some arbitrary, or normal, function. The debugger's
IDebugControl::GetExtensionFunction automatically prepends _EFN_ when
searching for the function in the extension DLL.
The Client parameter is the initial pointer to the debug engine's
IDebugClient interface.
The args parameter is simply the command line argument string passed to
the extension. It can be NULL or empty.
An extension can return DEBUG_EXTENSION_CONTINUE_SEARCH if the extension
cannot handle the request and in this case the debugger will search the
next path in the extension DLL chain.
In this sample, upon entering each extension, all required engine interfaces
are queried from the DEBUG_CLIENT using the INIT_API() macro. The same
interfaces are released using the EXIT_API() macro.
INIT_API() simply encapsulates a call to ExtQuery() and EXIT_API encapsulates
ExtRelease(). Any interfaces queried from the debugger engine should be
released before exit.
----------
Extensions Implemented in this Sample
cmdsample
This demonstrates use of engine APIs like IDebugControl::Execute, Output and
OutputStackTrace.
structsample
This shows how to read data from the target using helper definitions from the
wdbgexts.h header file. More importantly, it shows how to use types to read
values correctly so that the extension does not need to be rewritten when the
type definition changes for the target.
help
Extension DLLs should implement one extension called 'help' which shows
descriptions for the extension commands provided by the extension DLL.
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Prj_Lib.rar (83个子文件)
Prj_Lib
Tmp
Tmp
stdafx.h 320B
Tmp.vcproj.WINDNET.zdhuang.user 1KB
targetver.h 765B
Tmp.vcproj 5KB
stdafx.cpp 290B
ReadMe.txt 1KB
MyExceptionHandler.cpp 2KB
Except.txt 448B
Tmp.cpp 678B
StackWalker.h 443B
MyExceptionHandler.h 118B
StackWalker.cpp 4KB
Tmp.suo 18KB
Tmp.sln 875B
Debuggers
sdk
help
dbghelp.chm 409KB
inc
extsfns.h 59KB
dbghelp.h 126KB
engextcpp.hpp 103KB
engextcpp.cpp 130KB
dbgeng.h 522KB
wdbgexts.h 75KB
samples
dirs 131B
healer
sources 607B
healer.cpp 21KB
makefile 247B
assert
sources 536B
out.cpp 1KB
makefile 247B
out.hpp 843B
assert.cpp 8KB
dumpstk
sources 538B
out.cpp 1KB
makefile 247B
out.hpp 843B
dumpstk.cpp 7KB
exts
sources 575B
dbgexts.h 1KB
dbgexts.def 834B
dbgexts.cpp 8KB
makefile 247B
exts.cpp 11KB
dbgexts.rc 335B
readme.txt 4KB
remmon
sources 555B
out.cpp 1KB
makefile 247B
out.hpp 848B
remmon.cpp 9KB
extr.hpp 906B
extr.cpp 3KB
extcpp
sources 806B
makefile 247B
extcpp.rc 332B
readme.txt 496B
extcpp.cpp 4KB
extcpp.def 704B
simplext
sources 491B
simple.h 411B
simple.c 1KB
makefile 247B
exts.c 3KB
simple.rc 333B
readme.txt 3KB
simple.def 758B
adp_ext
sources 599B
dbgexts.h 1KB
adp_ext.rc 342B
dbgexts.cpp 3KB
makefile 247B
adp_ext.cpp 12KB
adp_ext.def 310B
readme.txt 3KB
analyze_continue
continue_known.xsd 1KB
continue_known.xml 2KB
lib
ia64
dbgeng.lib 2KB
engextcpp.lib 1.34MB
dbghelp.lib 51KB
amd64
dbgeng.lib 2KB
engextcpp.lib 1.03MB
dbghelp.lib 43KB
i386
dbgeng.lib 2KB
engextcpp.lib 795KB
dbghelp.lib 47KB
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