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Enum Processes with kernel and user times

, 7 Feb 2005
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An article on enumerating processes.

Sample Image -EnumProcesses.jpg


This article shows how to enumerate all the processes currently running on your system and display them with the process name, process ID tag, Kernel time and User time.


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 verify this, I used the following code:

DWORD dwLow, dwLow2, dwRes;
FILETIME ft, ft2;

    GetSystemTime(&st);              // gets current time
    SystemTimeToFileTime(&st, &ft);  // converts to file time format
    dwLow = ft.dwLowDateTime;
    st.wSecond += 1;                 // add 1 second
    SystemTimeToFileTime(&st, &ft2); // converts to file time format
    dwLow2 = ft2.dwLowDateTime;
    dwRes = dwLow2 - dwLow;
    printf("%lu\n", dwRes);
    result: 10,000,000

Using the code

I first saved all the kernel and user times in an array of a structure which saves the 64 bit values in an __int64 variable. Then after five seconds, I sample them again and calculate the difference, the difference is then divided by 156250. The number 156250 is 1/64 of the 64-bit value of ten million, the smallest amount of time a process is running. Now the CPU usage can be calculated, the sum of the kernel and user times divided by five. The console functions defined in Console.h are useful in any Win32 console application. The function clrscr(int screenSize) can be called with MINIMUM or MAXIMUM, the first will set the screen buffer size to its normal size of 24 by 80, the second sets it to 60 by 80. The function gotoxy(x, y) sets the cursor at line y character position x. The function setrgb(int fgc, int bgc) is used to set the background and foreground colors. The colors are defined in an enum in the header file, for example, setrgb(BLACK, INT_WHITE) is the default.

typedef struct tagPROCESSTIMES
   __int64 m_kernel;
   __int64 m_user;

Points of Interest

Being basically lazy, I don't like to click the maximize window button and then scroll to the top of the console window. See Console.cpp, I added code to set the console screen buffer to its maximum size when the second screen is called to display the results.


26, January 2005 - Version 1.0.


This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

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Comments and Discussions

GeneralThanks, Good Job PinmemberMember 62587418-Mar-09 16:54 
GeneralFunction that I build for my application from this article. PinmemberAndrewSmirnov30-May-06 6:44 
GeneralConsole Commands Pinmembercoolnaveen12343-Apr-06 20:34 
GeneralRe: Console Commands PinmemberRoger654-Apr-06 3:48 
GeneralRe: Console Commands Pinmembercoolnaveen12344-Apr-06 20:08 
GeneralPsapi Errors PinmemberCyKill22-Mar-05 7:25 
i have specified the include and lib folders of the SDK, added psapi.lib to the settings, now i am getting this following errors:
EnumProcesses.obj : error LNK2001: unresolved external symbol "void __cdecl setrgb(int,int)" (?setrgb@@YAXHH@Z)
EnumProcesses.obj : error LNK2001: unresolved external symbol "void __cdecl gotoxy(int,int)" (?gotoxy@@YAXHH@Z)
EnumProcesses.obj : error LNK2001: unresolved external symbol "void __cdecl clrscr(int)" (?clrscr@@YAXH@Z)
Debug/EnumProcesses.exe : fatal error LNK1120: 3 unresolved externals
Error executing link.exe.
EnumProcesses.exe - 4 error(s), 0 warning(s)
GeneralRe: Psapi Errors PinmemberRoger6522-Mar-05 7:36 
GeneralRe: Psapi Errors Pinmemberk999930-Aug-06 6:50 
Generalcsrss CPU usage PinmemberNathan Evans8-Feb-05 6:55 
GeneralRe: csrss CPU usage PinmemberRoger658-Feb-05 8:34 
GeneralRe: csrss CPU usage PinmemberNathan Evans8-Feb-05 8:38 
GeneralRe: csrss CPU usage PinmemberRoger658-Feb-05 10:48 
GeneralGood! PinmemberWREY3-Feb-05 12:51 
GeneralRe: Good! PinmemberRoger654-Feb-05 1:55 
GeneralRe: Good! PinmemberWREY4-Feb-05 3:19 
GeneralRe: Good! PinmemberRoger654-Feb-05 3:42 

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