及时获取系统每个历程占用的CPU

副标题#e#

本文的目标是为了和各人接头一个问题，同时给出一个按照历程ID，来返回该历程及时占用的CPU利用率的函数。但愿各人在用这个函数的时候别健忘我的问题。

今朝计较历程CPU占用率的要领主要有两种，一种是按照时间来计较，另一种按照注册表计较，我利用的是前者。前者要领道理：在一个特按时间段内计较特定历程的总时间和所有历程的总时间，它们的比值就是谁人特定历程简直CPU占有率。

我写了一个函数(改写)，以历程的ID作为参数，历程CPU占用率作为返回值，及时计较特定历程的CPU占用，测试正确。整个措施如下：

布局界说：

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;

#p#副标题#e#

函数界说：

int Button2Click(int id);//参数是历程ID
函数实体：
int Button2Click(int id)
{
int cpuusage;
PVOID pProcInfo = NULL;
DWORD dwInfoSize = 0x20000;
PPROCESSINFO pProcessInfo;
DWORD dwWorkingSet;
long ( __stdcall *NtQuerySystemInformation )( DWORD, PVOID, DWORD, DWORD );

static __int64 LastTotalProcessCPUUsage = 0;
static __int64 LastCurrentProcessCPUUsage = 0;
int CurrentDelta;
int TotalDelta;
__int64 TotalProcessCPUUsage = 0;
__int64 CurrentProcessCPUUsage = 0;
/////////////////////////////////
pProcInfo = (PVOID)(new byte[dwInfoSize]);
NtQuerySystemInformation = (long(__stdcall*)(DWORD,PVOID,DWORD,DWORD))
GetProcAddress( GetModuleHandle( "ntdll.dll" ),"NtQuerySystemInformation" );
NtQuerySystemInformation(5,pProcInfo,dwInfoSize,0);
pProcessInfo = (PPROCESSINFO)pProcInfo;
do
{
TotalProcessCPUUsage += (__int64)pProcessInfo->KernelTime.QuadPart + (__int64)pProcessInfo->UserTime.QuadPart;
if(pProcessInfo->dwProcessID == id)
{
dwWorkingSet = pProcessInfo->dwWorkingSet;
CurrentProcessCPUUsage += (__int64)pProcessInfo->KernelTime.QuadPart + (__int64)pProcessInfo->UserTime.QuadPart;
}
/////////
if(pProcessInfo->dwOffset == 0)
{
break;
}
pProcessInfo = (PPROCESSINFO)((byte*)pProcessInfo + pProcessInfo->dwOffset);
}
while(true);
TotalDelta = TotalProcessCPUUsage - LastTotalProcessCPUUsage;
CurrentDelta = CurrentProcessCPUUsage - LastCurrentProcessCPUUsage;
if(TotalDelta != 0)
cpuusage = 100 * CurrentDelta / TotalDelta;
//this->Caption = "CPU = " + IntToStr(100 * CurrentDelta / TotalDelta) +
//"Memory = "+ IntToStr(dwWorkingSet / 1024) " K";
LastTotalProcessCPUUsage = TotalProcessCPUUsage;
LastCurrentProcessCPUUsage = CurrentProcessCPUUsage;
delete[] pProcInfo;
return cpuusage;
}

节制台挪用：

int main(void)
{
while(true)
{
　 int s = Button2Click(0);//在此把历程ID作为参数传入
　 printf("%d\n",s);
　 Sleep(1000);
}
return 0;
}

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以上代码运行很是正常

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