如果获取进程CPU占用率
我有一段代码可以用TIMER来实现,但现在不能使用TIMER控件,需要直接调用函数后返回CPU使用率,请问该如何处理
代码如下:
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls, ExtCtrls;
type
TForm1 = class(TForm)
Button1: TButton;
Timer1: TTimer;
Label2: TLabel;
Edit1: TEdit;
procedure Timer1Timer(Sender: TObject);
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
dtStart, dtCPUStart: Tdatetime;
hProcess: THandle;
iCount:integer;
implementation
{$R *.dfm}
function AddFileTimes(Time1, Time2: TFileTime): TDateTime;
var
SysTime1, SysTime2: TSystemTime;
begin
FileTimeToSystemTime(Time1, SysTime1);
FileTimeToSystemTime(Time2, SysTime2);
Result := SystemTimeToDateTime(SysTime1) + SystemTimeToDateTime(SysTime2);
end;
function GetProcessCPU: TDateTime;
var
CreationTime, ExitTime, KernelTime, UserTime: TFileTime;
begin
GetProcessTimes(GetCurrentProcess, CreationTime, ExitTime, KernelTime,
UserTime);
Result := AddFileTimes(KernelTime, UserTime);
end;
procedure TForm1.Timer1Timer(Sender: TObject);
begin
if (dtStart <> 0) and (dtCPUStart <> 0) then
begin
Label2.Caption:=FloatToStr(-1*((GetProcessCPU-dtCPUStart)*100/(now-dtStart)));
end;
dtStart:=now;
dtCPUStart:=GetProcessCPU;
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
timer1.Enabled := False;
iCount:=0;
dtStart:=0;
dtCPUStart:=0;
hProcess := GetCurrentProcessId();
if hProcess > 0 then
timer1.Enabled := True;
end;
end.
[解决办法]
//------------------------------------------
const
Processor_IDX_Str = '238 ';
Processor_IDX = 238;
CPUUsageIDX = 6;
type
AInt64F = array[0..$FFFF] of TInt64F;
PAInt64F = ^AInt64F;
var
_PerfData: PPERF_DATA_BLOCK;
_BufferSize: Integer;
_POT: PPERF_OBJECT_TYPE;
_PCD: PPerf_Counter_Definition;
_ProcessorsCount: Integer;
_Counters: PAInt64F;
_PrevCounters: PAInt64F;
_SysTime: TInt64F;
_PrevSysTime: TInt64F;
_IsWinNT: Boolean;
_W9xCollecting: Boolean;
_W9xCpuUsage: DWORD;
_W9xCpuKey: HKEY;
//------------------------------------------
function GetCPUCount: Integer;
begin
if _IsWinNT then
begin
if _ProcessorsCount < 0 then CollectCPUData;
result := _ProcessorsCount;
end else
begin
result := 1;
end;
end;
//------------------------------------------
procedure ReleaseCPUData;
var H: HKEY;
R: DWORD;
dwDataSize, dwType: DWORD;
begin
if _IsWinNT then exit;
if not _W9xCollecting then exit;
_W9xCollecting := False;
RegCloseKey(_W9xCpuKey);
R := RegOpenKeyEx(HKEY_DYN_DATA, 'PerfStats\StopStat ', 0, KEY_ALL_ACCESS, H);
if R <> ERROR_SUCCESS then exit;
dwDataSize := sizeof(DWORD);
RegQueryValueEx(H, 'KERNEL\CPUUsage ', nil, @dwType, PBYTE(@_W9xCpuUsage), @dwDataSize);
RegCloseKey(H);
end;
//------------------------------------------
function GetCPUUsage(Index: Integer): Double;
begin
if _IsWinNT then
begin
if _ProcessorsCount < 0 then
CollectCPUData;
if (Index > = _ProcessorsCount) or (Index < 0) then
raise Exception.Create( 'CPU index out of bounds ');
if _PrevSysTime = _SysTime then result := 0 else
result := 1 - (_Counters[index] - _PrevCounters[index]) / (_SysTime - _PrevSysTime);
end else
begin
if Index <> 0 then
raise Exception.Create( 'CPU index out of bounds ');
if not _W9xCollecting then CollectCPUData;
result := _W9xCpuUsage / 100;
end;
if Result > 1 then
Result := 1;
end;
var VI: TOSVERSIONINFO;
//------------------------------------------
procedure CollectCPUData;
var BS: integer;
i: Integer;
_PCB_Instance: PPERF_COUNTER_BLOCK;
_PID_Instance: PPERF_INSTANCE_DEFINITION;
ST: TFileTime;
var H: HKEY;
R: DWORD;
dwDataSize, dwType: DWORD;
begin
if _IsWinNT then
begin
BS := _BufferSize;
while RegQueryValueEx(HKEY_PERFORMANCE_DATA, Processor_IDX_Str, nil, nil,
PByte(_PerfData), @BS) = ERROR_MORE_DATA do
begin
// Get a buffer that is big enough.
INC(_BufferSize, $1000);
BS := _BufferSize;
ReallocMem(_PerfData, _BufferSize);
end;
// Locate the performance object
_POT := PPERF_OBJECT_TYPE(DWORD(_PerfData) + _PerfData.HeaderLength);
for i := 1 to _PerfData.NumObjectTypes do
begin
if _POT.ObjectNameTitleIndex = Processor_IDX then Break;
_POT := PPERF_OBJECT_TYPE(DWORD(_POT) + _POT.TotalByteLength);
end;
// Check for success
if _POT.ObjectNameTitleIndex <> Processor_IDX then
raise Exception.Create( 'Unable to locate the "Processor " performance object ');
if _ProcessorsCount < 0 then
begin
_ProcessorsCount := _POT.NumInstances;
GetMem(_Counters, _ProcessorsCount * SizeOf(TInt64));
GetMem(_PrevCounters, _ProcessorsCount * SizeOf(TInt64));
end;
// Locate the "% CPU usage " counter definition
_PCD := PPERF_Counter_DEFINITION(DWORD(_POT) + _POT.HeaderLength);
for i := 1 to _POT.NumCounters do
begin
if _PCD.CounterNameTitleIndex = CPUUsageIDX then break;
_PCD := PPERF_COUNTER_DEFINITION(DWORD(_PCD) + _PCD.ByteLength);
end;
// Check for success
if _PCD.CounterNameTitleIndex <> CPUUsageIDX then
raise Exception.Create( 'Unable to locate the "% of CPU usage " performance counter ');
// Collecting coutners
_PID_Instance := PPERF_INSTANCE_DEFINITION(DWORD(_POT) + _POT.DefinitionLength);
for i := 0 to _ProcessorsCount - 1 do
begin
_PCB_Instance := PPERF_COUNTER_BLOCK(DWORD(_PID_Instance) + _PID_Instance.ByteLength);
_PrevCounters[i] := _Counters[i];
_Counters[i] := FInt64(PInt64(DWORD(_PCB_Instance) + _PCD.CounterOffset)^);
_PID_Instance := PPERF_INSTANCE_DEFINITION(DWORD(_PCB_Instance) + _PCB_Instance.ByteLength);
end;
_PrevSysTime := _SysTime;
SystemTimeToFileTime(_PerfData.SystemTime, ST);
_SysTime := FInt64(TInt64(ST));
end else
begin
if not _W9xCollecting then
begin
R := RegOpenKeyEx(HKEY_DYN_DATA, 'PerfStats\StartStat ', 0, KEY_ALL_ACCESS, H);
if R <> ERROR_SUCCESS then
raise Exception.Create( 'Unable to start performance monitoring ');
dwDataSize := sizeof(DWORD);
RegQueryValueEx(H, 'KERNEL\CPUUsage ', nil, @dwType, PBYTE(@_W9xCpuUsage), @dwDataSize);
RegCloseKey(H);
R := RegOpenKeyEx(HKEY_DYN_DATA, 'PerfStats\StatData ', 0, KEY_READ, _W9xCpuKey);
if R <> ERROR_SUCCESS then
raise Exception.Create( 'Unable to read performance data ');
_W9xCollecting := True;
end;
dwDataSize := sizeof(DWORD);
RegQueryValueEx(_W9xCpuKey, 'KERNEL\CPUUsage ', nil, @dwType, PBYTE(@_W9xCpuUsage), @dwDataSize);
end;
end;
initialization
_ProcessorsCount := -1;
_BufferSize := $2000;
_PerfData := AllocMem(_BufferSize);
VI.dwOSVersionInfoSize := SizeOf(VI);
if not GetVersionEx(VI) then raise Exception.Create( 'Can ' 't get the Windows version ');
_IsWinNT := VI.dwPlatformId = VER_PLATFORM_WIN32_NT;
finalization
ReleaseCPUData;
FreeMem(_PerfData);
end.
[解决办法]
HKEY_DYN_DATA的这个主键 'PerfStats\StartStat\KERNEL\CPUusage '
这个只在98下有效!
在NT下:你得先定义每一个进程的STARtime,PREtime,PREuse这样的一个CUP记录!
然后,再用以上的方法,刷新每一个进程的记录!才可以得到每一个进程的使作率,
哦就是这样实现的!
