得到cpu占有率的API函数:
GetSystemTimes
得到内存使用情况的API函数:
GlobalMemoryStatusEx Function
Retrieves information about the system's current usage of both physical and virtual memory.
GetPerformanceInfo Function
Retrieves the performance values contained in the PERFORMANCE_INFORMATION structure
获取特定程序的内存使用情况用:
GetProcessMemoryInfo Function
Retrieves information about the memory usage of the specified process.
我写的一个cpu使用率例子:
#define _WIN32_WINNT 0x0501
#include <Windows.h>
#include <iostream>
using namespace std;
__int64 CompareFileTime ( FILETIME time1, FILETIME time2 )
{
__int64 a = time1.dwHighDateTime << 32 | time1.dwLowDateTime ;
__int64 b = time2.dwHighDateTime << 32 | time2.dwLowDateTime ;
return (b - a);
}
void main()
{
HANDLE hEvent;
BOOL res ;
FILETIME preidleTime;
FILETIME prekernelTime;
FILETIME preuserTime;
FILETIME idleTime;
FILETIME kernelTime;
FILETIME userTime;
res = GetSystemTimes( &idleTime, &kernelTime, &userTime );
preidleTime = idleTime;
prekernelTime = kernelTime;
preuserTime = userTime ;
hEvent = CreateEvent (NULL,FALSE,FALSE,NULL); // 初始值为 nonsignaled ,并且每次触发后自动设置为nonsignaled
while (1){
WaitForSingleObject( hEvent,1000 ); //等待500毫秒
res = GetSystemTimes( &idleTime, &kernelTime, &userTime );
int idle = CompareFileTime( preidleTime,idleTime);
int kernel = CompareFileTime( prekernelTime, kernelTime);
int user = CompareFileTime(preuserTime, userTime);
int cpu = (kernel +user - idle) *100/(kernel+user);
int cpuidle = ( idle) *100/(kernel+user);
cout << "CPU利用率:" << cpu << "%" << " CPU空闲率:" <<cpuidle << "%" <<endl;
preidleTime = idleTime;
prekernelTime = kernelTime;
preuserTime = userTime ;
}
}
运行效果如图:
MSDN中 获取内存使用情况的例子:
Example Code [C++]
The following code shows a simple use of the GlobalMemoryStatusEx function.
// Sample output:
// There is 51 percent of memory in use.
// There are 2029968 total Kbytes of physical memory.
// There are 987388 free Kbytes of physical memory.
// There are 3884620 total Kbytes of paging file.
// There are 2799776 free Kbytes of paging file.
// There are 2097024 total Kbytes of virtual memory.
// There are 2084876 free Kbytes of virtual memory.
// There are 0 free Kbytes of extended memory.
#include <windows.h>
#include <stdio.h>
// Use to convert bytes to KB
#define DIV 1024
// Specify the width of the field in which to print the numbers.
// The asterisk in the format specifier "%*I64d" takes an integer
// argument and uses it to pad and right justify the number.
#define WIDTH 7
void main(int argc, char *argv[])
{
MEMORYSTATUSEX statex;
statex.dwLength = sizeof (statex);
GlobalMemoryStatusEx (&statex);
printf ("There is %*ld percent of memory in use./n",
WIDTH, statex.dwMemoryLoad);
printf ("There are %*I64d total Kbytes of physical memory./n",
WIDTH, statex.ullTotalPhys/DIV);
printf ("There are %*I64d free Kbytes of physical memory./n",
WIDTH, statex.ullAvailPhys/DIV);
printf ("There are %*I64d total Kbytes of paging file./n",
WIDTH, statex.ullTotalPageFile/DIV);
printf ("There are %*I64d free Kbytes of paging file./n",
WIDTH, statex.ullAvailPageFile/DIV);
printf ("There are %*I64d total Kbytes of virtual memory./n",
WIDTH, statex.ullTotalVirtual/DIV);
printf ("There are %*I64d free Kbytes of virtual memory./n",
WIDTH, statex.ullAvailVirtual/DIV);
// Show the amount of extended memory available.
printf ("There are %*I64d free Kbytes of extended memory./n",
WIDTH, statex.ullAvailExtendedVirtual/DIV);
}
MSDN中获取特定程序内存使用情况的例子:
To determine the efficiency of your application, you may want to examine its memory usage. The following sample code uses the GetProcessMemoryInfo function to obtain information about the memory usage of a process.
#include <windows.h>
#include <stdio.h>
#include <psapi.h>
void PrintMemoryInfo( DWORD processID )
{
HANDLE hProcess;
PROCESS_MEMORY_COUNTERS pmc;
// Print the process identifier.
printf( "/nProcess ID: %u/n", processID );
// Print information about the memory usage of the process.
hProcess = OpenProcess( PROCESS_QUERY_INFORMATION |
PROCESS_VM_READ,
FALSE, processID );
if (NULL == hProcess)
return;
if ( GetProcessMemoryInfo( hProcess, &pmc, sizeof(pmc)) )
{
printf( "/tPageFaultCount: 0x%08X/n", pmc.PageFaultCount );
printf( "/tPeakWorkingSetSize: 0x%08X/n",
pmc.PeakWorkingSetSize );
printf( "/tWorkingSetSize: 0x%08X/n", pmc.WorkingSetSize );
printf( "/tQuotaPeakPagedPoolUsage: 0x%08X/n",
pmc.QuotaPeakPagedPoolUsage );
printf( "/tQuotaPagedPoolUsage: 0x%08X/n",
pmc.QuotaPagedPoolUsage );
printf( "/tQuotaPeakNonPagedPoolUsage: 0x%08X/n",
pmc.QuotaPeakNonPagedPoolUsage );
printf( "/tQuotaNonPagedPoolUsage: 0x%08X/n",
pmc.QuotaNonPagedPoolUsage );
printf( "/tPagefileUsage: 0x%08X/n", pmc.PagefileUsage );
printf( "/tPeakPagefileUsage: 0x%08X/n",
pmc.PeakPagefileUsage );
}
CloseHandle( hProcess );
}
int main( )
{
// Get the list of process identifiers.
DWORD aProcesses[1024], cbNeeded, cProcesses;
unsigned int i;
if ( !EnumProcesses( aProcesses, sizeof(aProcesses), &cbNeeded ) )
return 1;
// Calculate how many process identifiers were returned.
cProcesses = cbNeeded / sizeof(DWORD);
// Print the memory usage for each process
for ( i = 0; i < cProcesses; i++ )
PrintMemoryInfo( aProcesses[i] );
return 0;
}//这个还需要添加库包含psapi.lib才能编译过