VC调试技术小技巧(2)

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#ifndef XTIB_H#define XTIB_H// Call SetThreadName(), and then paste this expression into the watch window:// (char*)(DW(@TIB+0x14)) #pragma pack(1) typedef struct _EXCEPTION_REGISTRATION_RECORD{ struct _EXCEPTION_REGISTRATION_RECORD * pNext; FARPROC pfnHandler;} EXCEPTION_REGISTRATION_RECORD, *PEXCEPTION_REGISTRATION_RECORD; typedef struct tagXTIB{ PEXCEPTION_REGISTRATION_RECORD pvExcept; // 00h Head of exception record list PVOID pvStackUserTop; // 04h Top of user stack PVOID pvStackUserBase; // 08h Base of user stack union // 0Ch (NT/Win95 differences) { struct // Win95 fields { WORD pvTDB; // 0Ch TDB WORD pvThunkSS; // 0Eh SS selector used for thunking to 16 bits DWORD unknown1; // 10h } WIN95; struct // WinNT fields { PVOID SubSystemTib; // 0Ch ULONG FiberData; // 10h } WINNT; } TIB_UNION1; PVOID pvArbitrary; // 14h Available for application use struct _tib *ptibSelf; // 18h Linear address of TIB structure union // 1Ch (NT/Win95 differences) { struct // Win95 fields { WORD TIBFlags; // 1Ch WORD Win16MutexCount; // 1Eh DWORD DebugContext; // 20h DWORD pCurrentPriority; // 24h DWORD pvQueue; // 28h Message Queue selector } WIN95; struct // WinNT fields { DWORD unknown1; // 1Ch DWORD processID; // 20h DWORD threadID; // 24h DWORD unknown2; // 28h } WINNT; } TIB_UNION2; PVOID* pvTLSArray; // 2Ch Thread Local Storage array union // 30h (NT/Win95 differences) { struct // Win95 fields { PVOID* pProcess; // 30h Pointer to owning process database } WIN95; } TIB_UNION3; // Internal function to get the TIB /*---------------------------------------------------------------------- FUNCTION : GetTIB DESCRIPTION : Returns pointer to TIB for current thread. PARAMETERS : None. RETURNS : NULL - A really bad thing !NULL - Pointer to TIB for current thread ----------------------------------------------------------------------*/ static tagXTIB * GetTIB() { tagXTIB * pTib; __asm { MOV EAX , FS:[18h] MOV pTib , EAX } return pTib; } /*---------------------------------------------------------------------- FUNCTION : SetThreadName DESCRIPTION : SetThreadName provides a way to "name" your threads so that you can see at a glance which thread is active when you are in the debugger. Calling SetThreadName sets the string pointer parameter into the Thread Information Block (TIB) pvArbitrary field (offset 0x14). Matt Pietrek discussed the TIB structure in his May 1996 "Under the Hood" column. I included Matt's TIB.h as part of this project if you want to see the rest of the fields in the TIB. pvArbitrary is an unused spot in the TIB that applications can use as they wish. SetThreadName does the right thing and checks if the pvArbitrary is not 0 and will not write the string pointer to avoid tromping on any other data written there. To view which thread is active in the Watch window, use "(char*)(DW(@TIB+0x14))" As you swap threads, you can now tell at a glance which thread you are in! PARAMETERS : szName - A pointer to the string which you would like to name the current thread. You should make the string pointer a constant name. RETURNS : TRUE - The thread name was set. FALSE - Something else overwrote the pvArbitrary field. ----------------------------------------------------------------------*/ static BOOL SetThreadName(LPCTSTR szName) { // Grab the TIB. tagXTIB * pTib = GetTIB(); // If someone has already written to the arbitrary field, I don't // want to be overwriting it. if (pTib->pvArbitrary != NULL) return FALSE; // Nothing's there. Set the name. pTib->pvArbitrary = (void*)szName; return TRUE; } /*---------------------------------------------------------------------- FUNCTION : GetThreadName DESCRIPTION : Returns the string pointer to the name assigned to the current thread. PARAMETERS : None. RETURNS : NULL - No name was assigned. !NULL - The value at the TIB pvArbitrary offset. Please note that the pointer could be invalid of if something other than SetThreadName used the pvArbitrary offset. ----------------------------------------------------------------------*/ static LPCTSTR GetThreadName() { // Grab the TIB. tagXTIB * pTib = GetTIB(); return (LPCTSTR)pTib->pvArbitrary; } } XTIB; #pragma pack() #endif //XTIB_H<script type="text/javascript"></script><script type="text/javascript"src="http://pagead2.googlesyndication.com/pagead/show_ads.js"></script>