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MiniDumpWriteDump function

Writes user-mode minidump information to the specified file.


BOOL WINAPI MiniDumpWriteDump(
  _In_ HANDLE                            hProcess,
  _In_ DWORD                             ProcessId,
  _In_ HANDLE                            hFile,
  _In_ MINIDUMP_TYPE                     DumpType,


hProcess [in]

A handle to the process for which the information is to be generated.

This handle must have PROCESS_QUERY_INFORMATION and PROCESS_VM_READ access to the process. If handle information is to be collected then PROCESS_DUP_HANDLE access is also required. For more information, see Process Security and Access Rights. The caller must also be able to get THREAD_ALL_ACCESS access to the threads in the process. For more information, see Thread Security and Access Rights.

ProcessId [in]

The identifier of the process for which the information is to be generated.

hFile [in]

A handle to the file in which the information is to be written.

DumpType [in]

The type of information to be generated. This parameter can be one or more of the values from the MINIDUMP_TYPE enumeration.

ExceptionParam [in]

A pointer to a MINIDUMP_EXCEPTION_INFORMATION structure describing the client exception that caused the minidump to be generated. If the value of this parameter is NULL, no exception information is included in the minidump file.

UserStreamParam [in]

A pointer to a MINIDUMP_USER_STREAM_INFORMATION structure. If the value of this parameter is NULL, no user-defined information is included in the minidump file.

CallbackParam [in]

A pointer to a MINIDUMP_CALLBACK_INFORMATION structure that specifies a callback routine which is to receive extended minidump information. If the value of this parameter is NULL, no callbacks are performed.

Return value

If the function succeeds, the return value is TRUE; otherwise, the return value is FALSE. To retrieve extended error information, call GetLastError. Note that the last error will be an HRESULT value.

If the operation is canceled, the last error code is HRESULT_FROM_WIN32(ERROR_CANCELLED).


The MiniDumpCallback function receives extended minidump information from MiniDumpWriteDump. It also provides a way for the caller to determine the granularity of information written to the minidump file, as the callback function can filter the default information.

MiniDumpWriteDump should be called from a separate process if at all possible, rather than from within the target process being dumped. This is especially true when the target process is already not stable. For example, if it just crashed. A loader deadlock is one of many potential side effects of calling MiniDumpWriteDump from within the target process.

MiniDumpWriteDump may not produce a valid stack trace for the calling thread. To work around this problem, you must capture the state of the calling thread before calling MiniDumpWriteDump and use it as the ExceptionParam parameter. One way to do this is to force an exception inside a __try/__except block and use the EXCEPTION_POINTERS information provided by GetExceptionInformation. Alternatively, you can call the function from a new worker thread and filter this worker thread from the dump.

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.



DbgHelp.dll 5.1 or later







See also

DbgHelp Functions



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