Windows 10 get CPU usage percent ?

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Roman

Joined: 21 Apr 2012
Posts: 1792

Roman 05 Dec 2020, 16:31

I found this.

Code:

#include <windows.h>
#include <psapi.h>
#include <pdh.h>

.................................................... 
    HQUERY Query = NULL;
    PDH_STATUS Status = PdhOpenQuery(NULL, 0, &Query);
    HCOUNTER Counter;
 
    CHAR CounterPathBuffer[PDH_MAX_COUNTER_PATH] = "\\Thread(_Total/_Total)\\Context Switches/sec";
    if (Status != ERROR_SUCCESS) ...ERROR...    
    
 Status = PdhAddCounter(Query, CounterPathBuffer, 0, &Counter);
 if (Status != ERROR_SUCCESS) ...ERROR...     
 
 Status = PdhCollectQueryData(Query);
    if (Status != ERROR_SUCCESS) ...ERROR...    

 ....................Timed.code................
 
    Status = PdhCollectQueryData(Query);
    if (Status != ERROR_SUCCESS) ...ERROR...    
 
    DWORD CounterType;
    PDH_FMT_COUNTERVALUE DisplayValue;
    Status = PdhGetFormattedCounterValue(Counter,
                                         PDH_FMT_DOUBLE,
                                         &CounterType,
                                         &DisplayValue);
    cout << "Counter: " << DisplayValue.doubleValue << endl;
 
    if (Query){
       PdhCloseQuery(Query);
    }

But get DisplayValue.doubleValue big value.
What do this DisplayValue.doubleValue , how convert or calculate ?

05 Dec 2020, 16:31

Roman

Joined: 21 Apr 2012
Posts: 1792

Roman 05 Dec 2020, 16:43

http://www.rastertek.com/dx10tut15.html

05 Dec 2020, 16:43

ProMiNick

Joined: 24 Mar 2012
Posts: 799
Location: Russian Federation, Sochi

ProMiNick 05 Dec 2020, 17:56

PDH_FMT_COUNTERVALUE
https://docs.microsoft.com/en-us/windows/win32/api/pdh/ns-pdh-pdh_fmt_countervalue
for 64bit I guess DisplayValue.doubleValue located at DisplayValue+8
how convert double to text?
MS provided something like this
cinvoke wsprintf,szBuffer,szFormatStr,[DisplayValue+8]

szFormatStr TCHAR 'Counter: %f',0
one moment wsprintf can`t convert floats to strings, so thou will have to realize it manualy (But community will never forget thou if thou share it)

05 Dec 2020, 17:56

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