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IGetContextProperties Interface

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The IGetContextProperties interface provides access to context object properties.

On This Page

Remarks
IGetContextProperties::Count Method
IGetContextProperties::EnumNames Method
IGetContextProperties::GetProperty Method

Remarks

The header file for the IGetContextProperties interface is mtx.h.

The IGetContextProperties interface exposes the following methods.

Method

Description

 

 

Count

Returns the number of properties associated with the context object.

EnumNames

Returns a reference to an enumerator that you can use to iterate through all the context object properties.

GetProperty

Returns a context object property.

See Also

Context Objects

IGetContextProperties::Count Method

Returns the number of context object properties.

Provided By

IGetContextProperties HRESULT IGetContextProperties::Count (

long * plCount);

Parameters

plCount

[out] The number of properties.

Return Values

S_OK

A valid count is returned in the plCount parameter.

E_INVALIDARG

The valid count could not be returned.

Example

IGetContextProperties::EnumNames Method

Returns a reference to an enumerator that you can use to iterate through all the context object properties.

Provided By

IGetContextProperties HRESULT IGetContextProperties::EnumNames (

IEnumNames ** ppenum );

Parameters

ppenum

[out] A reference to the IEnumNames interface on a new enumerator object that you can use to iterate through all the context object properties.

Return Values

S_OK

A reference to the requested enumerator is returned in the ppenum parameter.

E_INVALIDARG

The requested enumerator could not be returned.

Remarks

You use the EnumNames method to obtain a reference to an enumerator object. The returned IEnumNames interface exposes several methods you can use to iterate through a list of BSTRs representing context object properties. Once you have a name, you can use the GetProperty method to obtain a reference to the context object property it represents. See the COM documentation for information on enumerators.

As with any COM object, you must release an enumerator object when you're finished using it.

Example

IGetContextProperties::GetProperty Method

Returns a context object property.

Provided By

IGetContextProperties HRESULT IGetContextProperties::GetProperty (

BSTR name
VARIANT * pProperty );

Parameters

name

[in] The name of the context object property to be retrieved.

Pproperty

[out] The returned pointer to the property.

Return Values

S_OK

The property was returned successfully.

S_FALSE

The property was not found.

E_INVALIDARG

The name parameter was invalid.

Remarks

You can use GetProperty to retrieve the following Microsoft Internet Information Server (IIS) intrinsic objects:

  • Request

  • Response

  • Server

  • Application

  • Session

For more information, see the IIS documentation.

To retrieve an IIS object, call QueryInterface using the VT_DISPATCH member of the returned VARIANT for the interface to the IIS object (for example IReponse for the Response object).

Note: Context properties are not available in MTS 1.0 server processes.

Example

Count, EnumNames, GetProperty Methods Example

#include "stdafx.h"
#include <initguid.h>
#include "asptlb.h"
#include "mtx.h"
HRESULT hr = NOERROR;
// Get the context object
CComPtr<IObjectContext> pObjectContext;
hr = GetObjectContext(&pObjectContext);
// Get the Response object
CComVariant v;
CComBSTR bstr(L"Response");
CComQIPtr<IGetContextProperties,
    &IID_IGetContextProperties> pProps(pObjectContext);
hr = pProps->GetProperty(bstr, &v);
CComPtr<IDispatch> pDisp;
pDisp = V_DISPATCH(&v);
CComQIPtr<IResponse, &IID_IResponse> pResponse(pDisp);
// Print number of properties
long lCount;
hr = pProps->Count(&lCount);
bstr = L"<p>Number of properties: ";
CComBSTR bstrCount;
VarBstrFromI4(lCount, 0, 0, &bstrCount);
bstr.Append(bstrCount);
bstr.Append(L"</p>");
v = bstr;
hr = pResponse->Write(v);
// Iterate over properties collection and print the
// names of the properties
CComPtr<IEnumNames> pEnum;
CComBSTR bstrTemp;
pProps->EnumNames(&pEnum);
for ( int i = 0; i < lCount; ++i )
{
    pEnum->Next(1, &bstr, NULL);
    bstrTemp = L"<p>";
    bstrTemp.Append(bstr);
    bstrTemp.Append(L"</p>");
    v = bstrTemp;
    hr = pResponse->Write(v);
}
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