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unit PDH;
{$ALIGN ON}
{$MINENUMSIZE 4}
interface
uses
Windows;
const
PDH_NO_DATA = $800007D5;
PDH_MEMORY_ALLOCATION_FAILURE = $C0000BBB;
PDH_INVALID_HANDLE = $C0000BBC;
PDH_INVALID_ARGUMENT = $C0000BBD;
PDH_FMT_RAW = $00000010;
PDH_FMT_ANSI = $00000020;
PDH_FMT_UNICODE = $00000040;
PDH_FMT_LONG = $00000100;
PDH_FMT_DOUBLE = $00000200;
PDH_FMT_LARGE = $00000400;
PDH_FMT_NOSCALE = $00001000;
PDH_FMT_1000 = $00002000;
PDH_FMT_NODATA = $00004000;
PDH_FMT_NOCAP100 = $00008000;
type
PQUERY = ^HQUERY;
HQUERY = THandle;
PCOUNTER = ^HCOUNTER;
HCOUNTER = THandle;
PDH_STATUS = Longint;
PPERF_COUNTER_BLOCK = ^TPERF_COUNTER_BLOCK;
_PERF_COUNTER_BLOCK = record // pcb
ByteLength : DWORD;
end;
{$EXTERNALSYM _PERF_COUNTER_BLOCK}
TPERF_COUNTER_BLOCK = _PERF_COUNTER_BLOCK;
PERF_COUNTER_BLOCK = _PERF_COUNTER_BLOCK;
{$EXTERNALSYM PERF_COUNTER_BLOCK}
PPERF_COUNTER_DEFINITION = ^TPERF_COUNTER_DEFINITION;
_PERF_COUNTER_DEFINITION = record // pcd
ByteLength : DWORD;
CounterNameTitleIndex: DWORD;
CounterNameTitle : LPWSTR;
CounterHelpTitleIndex: DWORD;
CounterHelpTitle : LPWSTR;
DefaultScale : DWORD;
DetailLevel : DWORD;
CounterType : DWORD;
CounterSize : DWORD;
CounterOffset : DWORD;
end;
{$EXTERNALSYM _PERF_COUNTER_DEFINITION}
TPERF_COUNTER_DEFINITION = _PERF_COUNTER_DEFINITION;
PERF_COUNTER_DEFINITION = _PERF_COUNTER_DEFINITION;
{$EXTERNALSYM PERF_COUNTER_DEFINITION}
PPERF_DATA_BLOCK = ^TPERF_DATA_BLOCK;
_PERF_DATA_BLOCK = record // pdb
Signature : array[0..3] of WCHAR;
LittleEndian : DWORD;
Version : DWORD;
Revision : DWORD;
TotalByteLength : DWORD;
HeaderLength : DWORD;
NumObjectTypes : DWORD;
DefaultObject : DWORD;
SysTime : SYSTEMTIME;
PerfTime : LARGE_INTEGER;
PerfFreq : LARGE_INTEGER;
PerfTime100nSec : LARGE_INTEGER;
SystemNameLength : DWORD;
SystemNameOffset : DWORD;
end;
{$EXTERNALSYM _PERF_DATA_BLOCK}
TPERF_DATA_BLOCK = _PERF_DATA_BLOCK;
PERF_DATA_BLOCK = _PERF_DATA_BLOCK;
{$EXTERNALSYM PERF_DATA_BLOCK}
PPERF_INSTANCE_DEFINITION = ^TPERF_INSTANCE_DEFINITION;
_PERF_INSTANCE_DEFINITION = record // pid
ByteLength : DWORD;
ParentObjectTitleIndex: DWORD;
ParentObjectInstance : DWORD;
UniqueID : DWORD;
NameOffset : DWORD;
NameLength : DWORD;
end;
{$EXTERNALSYM _PERF_INSTANCE_DEFINITION}
TPERF_INSTANCE_DEFINITION = _PERF_INSTANCE_DEFINITION;
PERF_INSTANCE_DEFINITION = _PERF_INSTANCE_DEFINITION;
{$EXTERNALSYM PERF_INSTANCE_DEFINITION}
PPERF_OBJECT_TYPE = ^TPERF_OBJECT_TYPE;
_PERF_OBJECT_TYPE = record // pot
TotalByteLength : DWORD;
DefinitionLength : DWORD;
HeaderLength : DWORD;
ObjectNameTitleIndex : DWORD;
ObjectNameTitle : LPWSTR;
ObjectHelpTitleIndex : DWORD;
ObjectHelpTitle : LPWSTR;
DetailLevel : DWORD;
NumCounters : DWORD;
DefaultCounter : DWORD;
NumInstances : DWORD;
CodePage : DWORD;
PerfTime : LARGE_INTEGER;
PerfFreq : LARGE_INTEGER;
end;
{$EXTERNALSYM _PERF_OBJECT_TYPE}
TPERF_OBJECT_TYPE = _PERF_OBJECT_TYPE;
PERF_OBJECT_TYPE = _PERF_OBJECT_TYPE;
{$EXTERNALSYM PERF_OBJECT_TYPE}
PPDH_FMT_COUNTERVALUE = ^TPDH_FMT_COUNTERVALUE;
_PDH_FMT_COUNTERVALUE = record
CStatus : DWORD;
longValue : Longint;
doubleValue : double;
largeValue : LONGLONG;
AnsiStringValue : LPCSTR;
WideStringValue : LPCWSTR;
end;
{$EXTERNALSYM _PDH_FMT_COUNTERVALUE}
TPDH_FMT_COUNTERVALUE = _PDH_FMT_COUNTERVALUE;
PDH_FMT_COUNTERVALUE = _PDH_FMT_COUNTERVALUE;
{$EXTERNALSYM PDH_FMT_COUNTERVALUE}
var
PdhOpenQuery : function( pReserved: Pointer;
dwUserData: DWORD;
phQuery: PQUERY ): PDH_STATUS; stdcall;
PdhCloseQuery : function( ahQuery: HQUERY ): PDH_STATUS; stdcall;
PdhAddCounter : function( ahQuery: HQUERY;
szFullCounterPath: PChar;
dwUserData: DWORD;
phCounter: PCOUNTER ): PDH_STATUS; stdcall;
PdhRemoveCounter : function( ahCounter: HCOUNTER ): PDH_STATUS; stdcall;
PdhCollectQueryData : function( ahQuery: HQUERY ): PDH_STATUS; stdcall;
PdhValidatePath : function( szFullCounterPath: PChar ): PDH_STATUS; stdcall;
PdhGetFormattedCounterValue : function( ahCounter: HCOUNTER;
dwFormat: DWORD;
lpdwType: LPDWORD;
pValue: PPDH_FMT_COUNTERVALUE): PDH_STATUS; stdcall;
function LoadPdh: Boolean;
implementation
var
hPdh: THandle = HINSTANCE_ERROR;
function LoadPdh: Boolean;
const
pdh_lib = 'pdh.dll';
begin
Result := hPdh > HINSTANCE_ERROR;
if Result then Exit;
hPdh := LoadLibrary( pdh_lib );
Result := hPdh > HINSTANCE_ERROR;
if Result then
begin
PdhOpenQuery := GetProcAddress( hPdh, 'PdhOpenQuery' );
PdhCloseQuery := GetProcAddress( hPdh, 'PdhCloseQuery' );
PdhAddCounter := GetProcAddress( hPdh, 'PdhAddCounterA' );
PdhRemoveCounter := GetProcAddress( hPdh, 'PdhRemoveCounter' );
PdhCollectQueryData := GetProcAddress( hPdh, 'PdhCollectQueryData' );
PdhValidatePath := GetProcAddress( hPdh, 'PdhValidatePathA' );
PdhGetFormattedCounterValue := GetProcAddress( hPdh, 'PdhGetFormattedCounterValue' );
end;
end;
initialization
LoadPdh;
finalization
if LoadPdh then
FreeLibrary( hPdh );
end.
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