CreatePropertyGroup, CreateProperty, put_Value, get_Value Methods Example

[This product will work only on Windows NT 4.0 versions and earlier. For Windows 2000 and later, see COM+ (Component Services).]

#include <mtx.h>
#include <mtxspm.h>


IObjectContext* pObjectContext = NULL;
ISharedPropertyGroupManager* pPropGpMgr = NULL;
ISharedPropertyGroup* pPropGp = NULL;
ISharedProperty* pPropNextNum = NULL;
VARIANT_BOOL fAlreadyExists = VARIANT_FALSE;
LONG lIsolationMode = LockMethod;
LONG lReleaseMode = Process;
LONG lNextValue = 0L;
BSTR stName, stNextNumber;
VARIANT vNext;
HRESULT hr = S_OK;

hr = GetObjectContext(&pObjectContext);

// Create the SharedPropertyGroupManager,
// SharedPropertyGroup, and SharedProperty.
hr = pObjectContext->CreateInstance
    (CLSID_SharedPropertyGroupManager,
    IID_ISharedPropertyGroupManager,
    (void**)&pPropGpMgr);

stName = SysAllocString(L"Counter");
hr = pPropGpMgr->CreatePropertyGroup(stName,
    &lIsolationMode, &lReleaseMode, &fAlreadyExists,
    &pPropGp);
SysFreeString(stName);

stNextNumber = SysAllocString(L"NextNum");
hr = pPropGp->CreateProperty
    (stNextNumber, &fAlreadyExists, &pPropNextNum);
SysFreeString(stNextNumber);

// Get the next number and increment the counter.
VariantInit(&vNext);
vNext.vt = VT_I4;
hr = pPropNextNum->get_Value(&vNext);
lNextValue = vNext.lVal++;
hr = pPropNextNum->put_Value(vNext);