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[out] LPFILETIME lpCreationTime,
[out] LPFILETIME lpExitTime,
[out] LPFILETIME lpKernelTime,
[out] LPFILETIME lpUserTime
Parameters
[in] hProcess
A handle to the process whose timing information is sought. The handle must have the
PROCESS_QUERY_INFORMATION
or
PROCESS_QUERY_LIMITED_INFORMATION
access right. For more information, see
Process Security and Access Rights
.
Windows Server 2003 and Windows XP:
The handle must have the
PROCESS_QUERY_INFORMATION
access right.
[out] lpCreationTime
A pointer to a
FILETIME
structure that receives the creation time of the process.
[out] lpExitTime
A pointer to a
FILETIME
structure that receives the exit time of the process. If the process has not exited, the content of this structure is undefined.
[out] lpKernelTime
A pointer to a
FILETIME
structure that receives the amount of time that the process has executed in kernel mode. The time that each of the threads of the process has executed in kernel mode is determined, and then all of those times are summed together to obtain this value.
[out] lpUserTime
A pointer to a
FILETIME
structure that receives the amount of time that the process has executed in user mode. The time that each of the threads of the process has executed in user mode is determined, and then all of those times are summed together to obtain this value. Note that this value can exceed the amount of real time elapsed (between
lpCreationTime
and
lpExitTime
) if the process executes across multiple CPU cores.
Return value
If the function succeeds, the return value is nonzero.
If the function fails, the return value is zero. To get extended error information, call
GetLastError
.
All times are expressed using
FILETIME
data structures. Such a structure contains two 32-bit values that combine to form a 64-bit count of 100-nanosecond time units.
Process creation and exit times are points in time expressed as the amount of time that has elapsed since midnight on January 1, 1601 at Greenwich, England. There are several functions that an application can use to convert such values to more generally useful forms.
Process kernel mode and user mode times are amounts of time. For example, if a process has spent one second in kernel mode, this function will fill the
FILETIME
structure specified by
lpKernelTime
with a 64-bit value of ten million. That is the number of 100-nanosecond units in one second.
To retrieve the number of CPU clock cycles used by the threads of the process, use the
QueryProcessCycleTime
function.
Requirements
Header
processthreadsapi.h (include Windows.h on Windows Server 2003, Windows Vista, Windows 7, Windows Server 2008 Windows Server 2008 R2)
Library
Kernel32.lib
Kernel32.dll
See also
FILETIME
FileTimeToDosDateTime
FileTimeToLocalFileTime
FileTimeToSystemTime
Process and Thread Functions
Processes
