how do I capture system resources usage ( start time,end time,%cpu,%mem usage of application(like firefox)) in windows through code in Qt,

Question

0.00/5 (No votes)

See more:

Friends, how do I capture system resources usage ( start time,end time,%cpu,%mem usage of application(like firefox)) in windows through code in Qt, I mean which library or DLL to download from where? How I use that in Qt?

It will be good if someone give answer in detail with small example. I'm new to programming.

I'm able to capture total ram and free ram like this

MEMORYSTATUSEX memory_status;
ZeroMemory(&memory_status, sizeof(MEMORYSTATUSEX));
memory_status.dwLength = sizeof(MEMORYSTATUSEX);
if (GlobalMemoryStatusEx(&memory_status))
{
int q=memory_status.ullTotalPhys/(1024 * 1024);
int q1=memory_status.ullAvailPhys/(1024 * 1024);
}

Posted 25-Jun-14 19:14pm

Vikas Chhikara

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Jochen Arndt · Answer 1 · 2014-06-26T02:30:00

Qt is an UI (User Interface) framework and does not contain any functions to get OS or system specific resource usage.

The functions you may use are part of the Windows kernel and did not require an additional library.

The function GetProcessTimes()[^] will give you the process start and end time, and the CPU times. Pass GetCurrentProcess() as first parameter to get the times for the running application. The CPU times can be used to calculate the CPU usage:

CPU_usage = 100 * (KernelTime + UserTime) / (Now - StartTime)

This is for all CPUs and may be divided by the number of CPUs in the system (see GetSystemInfo()[^]). The current time can be retrieved by calling GetSystemTimeAsFileTime(). Note that the FILETIME used by these functions is a structure and performing arithmetic operations requires special handling.

An untested example:

unsigned long long nCreate, nUser, nKernel, nNow;
FILETIME ftCreate, ftExit, ftKernel, ftUser, ftNow;
SYSTEM_INFO si;
::GetSystemInfo(&si);
::GetSystemTimeAsFileTime(&ftNow);
::GetProcessTimes(::GetCurrentProcess(), &ftCreate, &ftExit, &ftKernel, &ftUser);
nUser = (ftUser.dwHighDateTime << 32ULL) + ftUser.dwLowDateTime;
nKernel = (ftKernel.dwHighDateTime << 32ULL) + ftKernel.dwLowDateTime;
nNow = (ftNow.dwHighDateTime << 32ULL) + ftNow.dwLowDateTime;
nCreate = (ftCreate.dwHighDateTime << 32ULL) + ftCreate.dwLowDateTime;
double fCpuUsage = 100.0 * (nKernel + nUser) / (nNow - nCreate);
double fSingleCpuUsage = fCpuUsage / si.dwNumberOfProcessors;

To get the same information for single threads use the GetThreadTimes() function.

I did not have a solution for the memory usage. But hopefully someone else will answer this.