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StackWalkEx function

Obtains a stack trace.

Syntax


BOOL IMAGEAPI StackWalkEx(
  _In_      DWORD MachineType,
  _In_      HANDLE hProcess,
  _In_      HANDLE hThread,
  _Inout_   LPSTACKFRAME_EX StackFrame,
  _Inout_   PVOID ContextRecord,
  _In_opt_  PREAD_PROCESS_MEMORY_ROUTINE64 ReadMemoryRoutine,
  _In_opt_  PFUNCTION_TABLE_ACCESS_ROUTINE64 FunctionTableAccessRoutine,
  _In_opt_  PGET_MODULE_BASE_ROUTINE64 GetModuleBaseRoutine,
  _In_opt_  PTRANSLATE_ADDRESS_ROUTINE64 TranslateAddress,
  _In_      DWORD Flags
);

Parameters

MachineType [in]

The architecture type of the computer for which the stack trace is generated. This parameter can be one of the following values.

ValueMeaning
IMAGE_FILE_MACHINE_I386
0x014c

Intel x86

IMAGE_FILE_MACHINE_IA64
0x0200

Intel Itanium

IMAGE_FILE_MACHINE_AMD64
0x8664

x64 (AMD64 or EM64T)

 

hProcess [in]

A handle to the process for which the stack trace is generated. If the caller supplies a valid callback pointer for the ReadMemoryRoutine parameter, then this value does not have to be a valid process handle. It can be a token that is unique and consistently the same for all calls to the StackWalkEx function. If the symbol handler is used with StackWalkEx, use the same process handles for the calls to each function.

hThread [in]

A handle to the thread for which the stack trace is generated. If the caller supplies a valid callback pointer for the ReadMemoryRoutine parameter, then this value does not have to be a valid thread handle. It can be a token that is unique and consistently the same for all calls to the StackWalkEx function.

StackFrame [in, out]

A pointer to a STACKFRAME_EX structure. This structure receives information for the next frame, if the function call succeeds.

ContextRecord [in, out]

A pointer to a CONTEXT structure. This parameter is required only when the MachineType parameter is not IMAGE_FILE_MACHINE_I386. However, it is recommended that this parameter contain a valid context record. This allows StackWalkEx to handle a greater variety of situations.

This context may be modified, so do not pass a context record that should not be modified.

ReadMemoryRoutine [in, optional]

A callback routine that provides memory read services. When the StackWalkEx function needs to read memory from the process's address space, the ReadProcessMemoryProc64 callback is used.

If this parameter is NULL, then the function uses a default routine. In this case, the hProcess parameter must be a valid process handle.

If this parameter is not NULL, the application should implement and register a symbol handler callback function that handles CBA_READ_MEMORY.

FunctionTableAccessRoutine [in, optional]

A callback routine that provides access to the run-time function table for the process. This parameter is required because the StackWalkEx function does not have access to the process's run-time function table. For more information, see FunctionTableAccessProc64.

The symbol handler provides functions that load and access the run-time table. If these functions are used, then SymFunctionTableAccess64 can be passed as a valid parameter.

GetModuleBaseRoutine [in, optional]

A callback routine that provides a module base for any given virtual address. This parameter is required. For more information, see GetModuleBaseProc64.

The symbol handler provides functions that load and maintain module information. If these functions are used, then SymGetModuleBase64 can be passed as a valid parameter.

TranslateAddress [in, optional]

A callback routine that provides address translation for 16-bit addresses. For more information, see TranslateAddressProc64.

Most callers of StackWalkEx can safely pass NULL for this parameter.

Flags [in]

A combination of zero or more flags.

SYM_STKWALK_DEFAULT (0)
SYM_STKWALK_FORCE_FRAMEPTR (1)

Return value

If the function succeeds, the return value is TRUE.

If the function fails, the return value is FALSE. Note that StackWalkEx generally does not set the last error code.

Remarks

The StackWalkEx function provides a portable method for obtaining a stack trace. Using the StackWalkEx function is recommended over writing your own function because of all the complexities associated with stack walking on platforms. In addition, there are compiler options that cause the stack to appear differently, depending on how the module is compiled. By using this function, your application has a portable stack trace that continues to work as the compiler and operating system change.

The first call to this function will fail if the AddrPC, AddrFrame, and AddrStack members of the STACKFRAME64 structure passed in the StackFrame parameter are not initialized.

All DbgHelp functions, such as this one, are single threaded. Therefore, calls from more than one thread to this function will likely result in unexpected behavior or memory corruption. To avoid this, you must synchronize all concurrent calls from more than one thread to this function.

Requirements

Redistributable

DbgHelp.dll 6.2 or later

Header

DbgHelp.h

Library

DbgHelp.lib

DLL

DbgHelp.dll

See also

DbgHelp Functions
STACKFRAME_EX
CONTEXT
ReadProcessMemoryProc64
FunctionTableAccessProc64
SymFunctionTableAccess64
SymGetModuleBase64
TranslateAddressProc64

 

 

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