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UDataPerf.pas
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UDataPerf.pas
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unit UDataPerf;
{$MODE Delphi}
interface
uses
DataThread, UConfig, SysUtils;
const
PDH_FMT_LONG = $100;
PDH_FMT_DOUBLE = $200;
PDH_FMT_LARGE = $400;
PDH_FMT_NOSCALE = $1000;
PDH_FMT_1000 = $2000;
PDH_FMT_NODATA = $4000;
PDH_FMT_NOCAP100 = $8000;
type
// Should be variant but the case command used can only handle up to a 32 bit space in 32bit code
// thats fine we can typecast to long or double
PTPDH_FMT_COUNTERVALUE = ^TPDH_FMT_COUNTERVALUE;
TPDH_FMT_COUNTERVALUE = record
CStatus: DWORD ;
largeValue: Int64;
//case integer of
// 1: ( longValue: Int32; );
// 2: ( doubleValue: double; );
// 3: ( largeValue: Int64; );
// 4: ( AnsiStringValue: PAnsiChar; );
// 5: ( WideStringValue: PWideChar; );
end;
type
TCounterData = record
Handle: THANDLE;
format: integer;
Scale: DWORD;
Data: int64;
end;
type
TPerfDataThread = class(TDataThread)
private
pdhQueryHandle: THANDLE;
pdhDataArray: Array [1..length(config.PerfSettings)] of TCounterData;
pdhLastSettingsArray: Array [1..length(config.PerfSettings)] of TPerfSettings;
protected
function AllowRefresh : boolean; override;
procedure DoUpdate; override;
procedure SetupQuery;
procedure CloseQuery;
public
constructor Create;
destructor Destroy; override;
procedure ResolveVariables(var Line : string); override;
end;
implementation
uses
UUtils, StrUtils, windows;
function PdhOpenQueryW( szDataSource : PAnsiChar; dwUserData : PDWORD; phQuery: pointer ) : HRESULT; stdcall; external 'pdh' name 'PdhOpenQueryW';
function PdhCloseQuery( hQuery: THANDLE ) : HRESULT; stdcall; external 'pdh' name 'PdhCloseQuery';
function PdhAddCounterW( hQuery : THANDLE; szFullCounterPath : PWideChar; dwUserData: PDWORD; phCounter : pointer ) : HRESULT; stdcall; external 'pdh' name 'PdhAddCounterW';
function PdhCollectQueryData( hQuery : THANDLE ) : HRESULT; stdcall; external 'pdh' name 'PdhCollectQueryData';
function PdhGetFormattedCounterValue( hCounter : THANDLE; dwFormat : DWORD; lpdwType: pointer; pValue: pointer ) : HRESULT; stdcall; external 'pdh' name 'PdhGetFormattedCounterValue';
constructor TPerfDataThread.Create;
begin
SetupQuery;
inherited Create(500);
end;
destructor TPerfDataThread.Destroy;
begin
CloseQuery;
inherited;
end;
function TPerfDataThread.AllowRefresh : boolean;
begin
Result := true;
end;
procedure TPerfDataThread.SetupQuery;
var
pdhRet: HRESULT;
pdhCounterPath: string;
i: integer;
wideChars : array[0..255] of WideChar;
begin
if pdhQueryHandle > 0 then CloseQuery;
pdhRet := PdhOpenQueryW(nil, nil, @pdhQueryHandle);
if pdhRet <> 0 then
begin
for i := 1 to length(config.PerfSettings) do
pdhDataArray[i].Data := 0;
exit;
end;
for i := 1 to length(config.PerfSettings) do
begin
pdhLastSettingsArray[i] := config.PerfSettings[i];
if (config.PerfSettings[i].PerfObject = '') or
(config.PerfSettings[i].Counter = '') then
continue;
pdhDataArray[i].Data := 0;
pdhCounterPath := '\' + config.PerfSettings[i].PerfObject;
if (config.PerfSettings[i].Instance <> '') then
pdhCounterPath := pdhCounterPath + '(' + config.PerfSettings[i].Instance + ')';
pdhCounterPath := pdhCounterPath + '\' + config.PerfSettings[i].Counter;
StringToWideChar(rawbytestring(pdhCounterPath), wideChars, 255);
pdhRet := PdhAddCounterW(pdhQueryHandle, pwidechar(wideChars), nil, @pdhDataArray[i].Handle);
case config.PerfSettings[i].Format of
0: pdhDataArray[i].format := PDH_FMT_LONG;
1: pdhDataArray[i].format := PDH_FMT_DOUBLE;
2: pdhDataArray[i].format := PDH_FMT_LARGE;
end;
case config.PerfSettings[i].Scaling of
0: pdhDataArray[i].Scale := 0;
1: pdhDataArray[i].Scale := PDH_FMT_NOSCALE;
2: pdhDataArray[i].Scale := PDH_FMT_1000;
3: pdhDataArray[i].Scale := PDH_FMT_NODATA;
4: pdhDataArray[i].Scale := PDH_FMT_NOCAP100;
end;
end;
end;
procedure TPerfDataThread.CloseQuery;
begin
PdhCloseQuery(pdhQueryHandle);
end;
procedure TPerfDataThread.DoUpdate;
var
pdhRet: HRESULT;
pdhCounterType: DWORD;
pdhFmtCounterValue: TPDH_FMT_COUNTERVALUE;
i: integer;
begin
if pdhQueryHandle > 0 then
PdhCollectQueryData(pdhQueryHandle);
for i := 1 to length(config.PerfSettings) do
begin
if (pdhLastSettingsArray[i].PerfObject <> config.PerfSettings[i].PerfObject) or
(pdhLastSettingsArray[i].Counter <> config.PerfSettings[i].Counter) or
(pdhLastSettingsArray[i].Instance <> config.PerfSettings[i].Instance) or
(pdhLastSettingsArray[i].Format <> config.PerfSettings[i].Format) or
(pdhLastSettingsArray[i].Scaling <> config.PerfSettings[i].Scaling) then
begin
SetupQuery; // tear it all down and start again
exit;
end;
pdhRet := PdhGetFormattedCounterValue(pdhDataArray[i].Handle, pdhDataArray[i].format or pdhDataArray[i].Scale , @pdhCounterType, @pdhFmtCounterValue);
if pdhRet = 0 then
begin
case config.PerfSettings[i].Format of
0: pdhDataArray[i].Data := round((int32(pdhFmtCounterValue.largeValue) + pdhDataArray[i].Data) / 2);
1: pdhDataArray[i].Data := int64((double(pdhFmtCounterValue.largeValue) + double(pdhDataArray[i].Data)) / 2);
2: pdhDataArray[i].Data := round((pdhFmtCounterValue.largeValue + pdhDataArray[i].Data) / 2);
end;
end
end;
end;
procedure TPerfDataThread.ResolveVariables(var Line : string);
var
i: integer;
fmt: TFormatSettings;
begin
fmt := DefaultFormatSettings;
fmt.DecimalSeparator := '.';
if (pos('$Perf',Line) > 0) then
for i := 1 to length(config.PerfSettings) do
begin
case config.PerfSettings[i].Format of
0: line := StringReplace(line, '$Perf(' + IntToStr(i) + ')', inttostr(pdhDataArray[i].Data), [rfReplaceAll]);
1: line := StringReplace(line, '$Perf(' + IntToStr(i) + ')', floattostr(double(pdhDataArray[i].Data), fmt), [rfReplaceAll]);
2: line := StringReplace(line, '$Perf(' + IntToStr(i) + ')', inttostr(pdhDataArray[i].Data), [rfReplaceAll]);
end;
end;
end;
end.