<b>及时获得系统每个进程占用的CPU</b>[VC/C++编程]

本文的目的是为了和大家谈论一个问题,同时给出一个按照进程ID,来返回该进程及时占用的CPU利用率的函数.但愿大家在用这个函数的时刻别忘掉我的问题.

目前计算进程CPU占用率的办法主要有两种,一种是按照时间来计算,另一种按照注册表计算,我利用的是前者.前者办法原理:在一个特按时间段内计算特定进程的总时间和全部进程的总时间,它们的比值就是那个特定进程的确CPU占据率.

我写了一个函数(改写),以进程的ID作为参数,进程CPU占用率作为返回值,及时计算特定进程的CPU占用,测试精确.整个程序以下:

构造定义:

typedef struct _THREAD_INFO
{
LARGE_INTEGER CreateTime;
DWORD dwUnknown1;
DWORD dwStartAddress;
DWORD StartEIP;
DWORD dwOwnerPID;
DWORD dwThreadId;
DWORD dwCurrentPriority;
DWORD dwBasePriority;
DWORD dwContextSwitches;
DWORD Unknown;
DWORD WaitReason;
}THREADINFO, *PTHREADINFO;
typedef struct _UNICODE_STRING
{
USHORT Length;
USHORT MaxLength;
PWSTR Buffer;
} UNICODE_STRING;
typedef struct _PROCESS_INFO
{
DWORD dwOffset;
DWORD dwThreadsCount;
DWORD dwUnused1[6];
LARGE_INTEGER CreateTime;
LARGE_INTEGER UserTime;
LARGE_INTEGER KernelTime;
UNICODE_STRING ProcessName;
DWORD dwBasePriority;
DWORD dwProcessID;
DWORD dwParentProcessId;
DWORD dwHandleCount;
DWORD dwUnused3[2];
DWORD dwVirtualBytesPeak;
DWORD dwVirtualBytes;
ULONG dwPageFaults;
DWORD dwWorkingSetPeak;
DWORD dwWorkingSet;
DWORD dwQuotaPeakPagedPoolUsage;
DWORD dwQuotaPagedPoolUsage;
DWORD dwQuotaPeakNonPagedPoolUsage;
DWORD dwQuotaNonPagedPoolUsage;
DWORD dwPageFileUsage;
DWORD dwPageFileUsagePeak;
DWORD dCommitCharge;
THREADINFO ThreadSysInfo[1];
} PROCESSINFO, *PPROCESSINFO;

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