Interfaz IADsLargeInteger (iads.h)
La interfaz IADsLargeInteger se usa para manipular enteros de 64 bits del tipo LargeInteger .
Herencia
La interfaz IADsLargeInteger hereda de la interfaz IDispatch.
Comentarios
El control de IADsLargeInteger en Visual Basic es difícil por el hecho de que Visual Basic no tiene ningún tipo de datos numérico sin signo nativo. Esto puede provocar errores en la conversión de datos si LowPart o HighPart tiene el conjunto de bits alto, lo que hace que Visual Basic controle el número como negativo. Los ejemplos de código de Visual Basic siguientes muestran cómo controlar correctamente el IADsLargeInteger en Visual Basic.
Ejemplos
En el ejemplo siguiente se muestra cómo convertir un objeto IADsLargeInteger en una cadena hexadecimal.
Dim oDomain As IADs
Dim oLargeInt As LargeInteger
Set oDomain = GetObject("LDAP://DC=fabrikam,DC=com")
Set oLargeInt = oDomain.Get("creationTime")
Debug.Print oLargeInt.HighPart
Debug.Print oLargeInt.LowPart
strTemp = "&H" + CStr(Hex(oLargeInt.HighPart)) + _
CStr(Hex(oLargeInt.LowPart))
Debug.Print strTemp
En Visual Basic, es posible convertir objetos IADsLargeInteger que representen una fecha o hora en una hora Variant mediante las API FileTimeToSystemTime y SystemTimeToVariantTime . Esto se muestra en el ejemplo de código siguiente.
Public Declare Function FileTimeToSystemTime Lib "kernel32" _
(lpFileTime As FILETIME, _
lpSystemTime As SYSTEMTIME) As Long
Public Declare Function SystemTimeToVariantTime Lib "oleaut32.dll" _
(lpSystemTime As SYSTEMTIME, _
dbTime As Double) As Long
Public Type SYSTEMTIME
wYear As Integer
wMonth As Integer
wDayOfWeek As Integer
wDay As Integer
wHour As Integer
wMinute As Integer
wSecond As Integer
wMilliseconds As Integer
End Type
Public Type FILETIME
dwLowDateTime As Long
dwHighDateTime As Long
End Type
' This function will convert the ADSI data type LargeInteger to
' a Variant time value in Greenwich Mean Time (GMT).
Function LargeInteger_To_Time(oLargeInt As LargeInteger, vTime As Variant)_
As Boolean
On Error Resume Next
Dim pFileTime As FILETIME
Dim pSysTime As SYSTEMTIME
Dim dbTime As Double
Dim lResult As Long
If (oLargeInt.HighPart = 0 And oLargeInt.LowPart = 0) Then
vTime = 0
LargeInteger_To_Time = True
Exit Function
End If
If (oLargeInt.LowPart = -1) Then
vTime = -1
LargeInteger_To_Time = True
Exit Function
End If
pFileTime.dwHighDateTime = oLargeInt.HighPart
pFileTime.dwLowDateTime = oLargeInt.LowPart
' Convert the FileTime to System time.
lResult = FileTimeToSystemTime(pFileTime, pSysTime)
If lResult = 0 Then
LargeInteger_To_Time = False
Debug.Print "FileTimeToSystemTime: " + Err.Number + " - "_
+ Err.Description
Exit Function
End If
' Convert System Time to a Double.
lResult = SystemTimeToVariantTime(pSysTime, dbTime)
If lResult = 0 Then
LargeInteger_To_Time = False
Debug.Print "SystemTimeToVariantTime: " + Err.Number + _
" - " + Err.Description
Exit Function
End If
' Place the double in the variant.
vTime = CDate(dbTime)
LargeInteger_To_Time = True
End Function
En el ejemplo siguiente se muestra cómo convertir un iaDsLargeInteger en un entero de 64 bits.
HRESULT PrintAccountExpires(LPCWSTR pwszADsPath)
{
if(!pwszADsPath)
{
return E_INVALIDARG;
}
HRESULT hr;
CComPtr<IADs> spads;
// Bind to the object.
hr = ADsGetObject(pwszADsPath, IID_IADs, (LPVOID*)&spads);
if(FAILED(hr))
{
return hr;
}
/*
Get the accountExpires attribute, which is an
IDispatch that contains an IADsLargeInteger.
*/
CComVariant svar;
hr = spads->Get(CComBSTR("accountExpires"), &svar);
if(FAILED(hr))
{
return hr;
}
// Get the IADsLargeInteger interface.
CComPtr<IADsLargeInteger> spli;
hr = svar.pdispVal->QueryInterface(IID_IADsLargeInteger,
(LPVOID*)&spli);
if(FAILED(hr))
{
return hr;
}
// Get the high and low parts of the value.
long lHigh;
long lLow;
hr = spli->get_HighPart(&lHigh);
hr = spli->get_LowPart(&lLow);
// Convert the high and low parts to an __i64.
__int64 i64;
i64 = (ULONG)lHigh;
i64 = (i64 << 32);
i64 = i64 + (ULONG)lLow;
// Print all of the values.
wprintf(L"HighPart = %u, LowPart = %u, Combined = %I64d\n",
lHigh, lLow, i64);
return hr;
}
Requisitos
| Cliente mínimo compatible | Windows Vista |
| Servidor mínimo compatible | Windows Server 2008 |
| Plataforma de destino | Windows |
| Encabezado | iads.h |