pb 獲取cpu使用率

[fjgzqjh]

pb要怎麼樣才能獲得cpu使用率，像任務管理器顯示的值一樣

[fjgzqjh]

pb 如何得到任務管理器上的cpu使用率

[newease]

收藏了一个delphi的获取CPU使用的代码 可以参考一下

http://www.swissdelphicenter.ch/torry/showcode.php?id=969
How to get the CPU usage in percent
const
SystemBasicInformation = 0;
SystemPerformanceInformation = 2;
SystemTimeInformation = 3;

type
TPDWord = ^DWORD;

TSystem_Basic_Information = packed record
dwUnknown1: DWORD;
uKeMaximumIncrement: ULONG;
uPageSize: ULONG;
uMmNumberOfPhysicalPages: ULONG;
uMmLowestPhysicalPage: ULONG;
uMmHighestPhysicalPage: ULONG;
uAllocationGranularity: ULONG;
pLowestUserAddress: Pointer;
pMmHighestUserAddress: Pointer;
uKeActiveProcessors: ULONG;
bKeNumberProcessors: byte;
bUnknown2: byte;
wUnknown3: word;
end;

type
TSystem_Performance_Information = packed record
liIdleTime: LARGE_INTEGER; {LARGE_INTEGER}
dwSpare: array[0..75] of DWORD;
end;

type
TSystem_Time_Information = packed record
liKeBootTime: LARGE_INTEGER;
liKeSystemTime: LARGE_INTEGER;
liExpTimeZoneBias: LARGE_INTEGER;
uCurrentTimeZoneId: ULONG;
dwReserved: DWORD;
end;

var
NtQuerySystemInformation: function(infoClass: DWORD;
buffer: Pointer;
bufSize: DWORD;
returnSize: TPDword): DWORD; stdcall = nil;


liOldIdleTime: LARGE_INTEGER = ();
liOldSystemTime: LARGE_INTEGER = ();

function Li2Double(x: LARGE_INTEGER): Double;
begin
Result := x.HighPart * 4.294967296E9 + x.LowPart
end;

procedure GetCPUUsage;
var
SysBaseInfo: TSystem_Basic_Information;
SysPerfInfo: TSystem_Performance_Information;
SysTimeInfo: TSystem_Time_Information;
status: Longint; {long}
dbSystemTime: Double;
dbIdleTime: Double;

bLoopAborted : boolean;

begin
if @NtQuerySystemInformation = nil then
NtQuerySystemInformation := GetProcAddress(GetModuleHandle('ntdll.dll'),
'NtQuerySystemInformation');

// get number of processors in the system

status := NtQuerySystemInformation(SystemBasicInformation, @SysBaseInfo, SizeOf(SysBaseInfo), nil);
if status <> 0 then Exit;

// Show some information
with SysBaseInfo do
begin
ShowMessage(
Format('uKeMaximumIncrement: %d'#13'uPageSize: %d'#13+
'uMmNumberOfPhysicalPages: %d'+#13+'uMmLowestPhysicalPage: %d'+#13+
'uMmHighestPhysicalPage: %d'+#13+'uAllocationGranularity: %d'#13+
'uKeActiveProcessors: %d'#13'bKeNumberProcessors: %d',
[uKeMaximumIncrement, uPageSize, uMmNumberOfPhysicalPages,
uMmLowestPhysicalPage, uMmHighestPhysicalPage, uAllocationGranularity,
uKeActiveProcessors, bKeNumberProcessors]));
end;


bLoopAborted := False;

while not bLoopAborted do
begin

// get new system time
status := NtQuerySystemInformation(SystemTimeInformation, @SysTimeInfo, SizeOf(SysTimeInfo), 0);
if status <> 0 then Exit;

// get new CPU's idle time
status := NtQuerySystemInformation(SystemPerformanceInformation, @SysPerfInfo, SizeOf(SysPerfInfo), nil);
if status <> 0 then Exit;

// if it's a first call - skip it
if (liOldIdleTime.QuadPart <> 0) then
begin

// CurrentValue = NewValue - OldValue
dbIdleTime := Li2Double(SysPerfInfo.liIdleTime) - Li2Double(liOldIdleTime);
dbSystemTime := Li2Double(SysTimeInfo.liKeSystemTime) - Li2Double(liOldSystemTime);

// CurrentCpuIdle = IdleTime / SystemTime
dbIdleTime := dbIdleTime / dbSystemTime;

// CurrentCpuUsage% = 100 - (CurrentCpuIdle * 100) / NumberOfProcessors
dbIdleTime := 100.0 - dbIdleTime * 100.0 / SysBaseInfo.bKeNumberProcessors + 0.5;

// Show Percentage
Form1.Label1.Caption := FormatFloat('CPU Usage: 0.0 %',dbIdleTime);

Application.ProcessMessages;

// Abort if user pressed ESC or Application is terminated
bLoopAborted := (GetKeyState(VK_ESCAPE) and 128 = 128) or Application.Terminated;

end;

// store new CPU's idle and system time
liOldIdleTime := SysPerfInfo.liIdleTime;
liOldSystemTime := SysTimeInfo.liKeSystemTime;

// wait one second
Sleep(1000);
end;
end;


procedure TForm1.Button1Click(Sender: TObject);
begin
GetCPUUsage
end;