问题
I am a newbie in C and WinAPI.
I spent more than 3 hours trying to do this, but totally failed.
Could anyone help me?
Here is my code:
FILETIME *KernelTime;
// Or struct _FILETIME *KernelTime
HANDLE Process = OpenProcess ( PROCESS_ALL_ACCESS, FALSE, 0);
// 0 is the PID of System Idle Process
GetProcessTimes (Process, NULL, NULL, KernelTime, NULL);
/*
How to write here?
*/
double ElapsedProcessTime // Target !!
I think these might be useful for solving this problem:
http://msdn.microsoft.com/en-us/library/windows/desktop/ms683223%28v=vs.85%29.aspx
http://msdn.microsoft.com/en-us/library/windows/desktop/ms724284(v=vs.85).aspx
http://msdn.microsoft.com/en-us/library/windows/desktop/ms724280(v=vs.85).aspx
Compiler: GCC-mingw32
Thanks.
回答1:
From here:
This code sample will output the current CPU usage data collected from the performance counters in Windows. The results are shown in percent where 100% means max usage and 0% means minimum usage.
#include <windows.h>
#include <pdh.h>
#include <pdhmsg.h>
#include <stdio.h>
//------------------------------------------------------------------------------------------------------------------
// Prototype(s)...
//------------------------------------------------------------------------------------------------------------------
int cpuusage(void);
//------------------------------------------------------------------------------------------------------------------
// getcpuload()
// directly prints the CPU usage on screen. This function need to be called twice with a minimum of 1 seconds
// delay (msdn guideline) to display something usefull.
// Also returns the usage in percent 0-100 where 100 means the system is working at maximum capacity.
// Note for multiprocessor systems:
// If one CPU is working at max capacity the result will (if using (_total) for PdhAddCounter() ) show a maximum
// workload of 50% unless the other CPU(s) is also working at max load.
//------------------------------------------------------------------------------------------------------------------
INT getcpuload()
{
static PDH_STATUS status;
static PDH_FMT_COUNTERVALUE value;
static HQUERY query;
static HCOUNTER counter;
static DWORD ret;
static char runonce=1;
char cput=0;
if(runonce)
{
status = PdhOpenQuery(NULL, 0, &query);
if(status != ERROR_SUCCESS)
{
printf("PdhOpenQuery() ***Error: 0x%X\n",status);
return 0;
}
PdhAddCounter(query, TEXT("\\Processor(_Total)\\% Processor Time"),0,&counter); // A total of ALL CPU's in the system
//PdhAddCounter(query, TEXT("\\Processor(0)\\% Processor Time"),0,&counter); // For systems with more than one CPU (Cpu0)
//PdhAddCounter(query, TEXT("\\Processor(1)\\% Processor Time"),0,&counter); // For systems with more than one CPU (Cpu1)
runonce=0;
PdhCollectQueryData(query); // No error checking here
return 0;
}
status = PdhCollectQueryData(query);
if(status != ERROR_SUCCESS)
{
printf("PhdCollectQueryData() ***Error: 0x%X\n",status);
if(status==PDH_INVALID_HANDLE)
printf("PDH_INVALID_HANDLE\n");
else if(status==PDH_NO_DATA)
printf("PDH_NO_DATA\n");
else
printf("Unknown error\n");
return 0;
}
status = PdhGetFormattedCounterValue(counter, PDH_FMT_DOUBLE | PDH_FMT_NOCAP100 ,&ret, &value);
if(status != ERROR_SUCCESS)
{
printf("PdhGetFormattedCounterValue() ***Error: 0x%X\n",status);
return 0;
}
cput = value.doubleValue;
printf("\n\n"
"CPU Total usage: %3d%%\n",cput);
return cput;
}
//------------------------------------------------------------------------------------------------------------------
// Entry point
//------------------------------------------------------------------------------------------------------------------
int main(void)
{
while(1)
{
getcpuload();
sleep(1000);
}
return 0;
}
来源:https://stackoverflow.com/questions/20033457/problems-in-getting-process-time-in-c-please-help-me