121 lines
2.1 KiB
C++
121 lines
2.1 KiB
C++
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// DevicesEnum.cpp : Implementation of CDevCon2App and DLL registration.
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#include "stdafx.h"
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#include "DevCon2.h"
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#include "Device.h"
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#include "Devices.h"
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#include "DevicesEnum.h"
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/////////////////////////////////////////////////////////////////////////////
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//
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CDevicesEnum::~CDevicesEnum()
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{
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DWORD c;
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if(pDevices) {
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for(c=0;c<Count;c++) {
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pDevices[c]->Release();
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}
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delete [] pDevices;
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}
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}
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HRESULT CDevicesEnum::Next(
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ULONG celt,
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VARIANT * rgVar,
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ULONG * pCeltFetched
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)
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{
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ULONG fetched;
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CDevice *pDev;
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if(pCeltFetched) {
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*pCeltFetched = 0;
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}
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for(fetched = 0; fetched<celt && Position<Count ; fetched++,Position++) {
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VariantInit(&rgVar[fetched]);
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pDev = pDevices[Position];
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pDev->AddRef();
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V_VT(&rgVar[fetched]) = VT_DISPATCH;
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V_DISPATCH(&rgVar[fetched]) = pDev;
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}
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if(pCeltFetched) {
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*pCeltFetched = fetched;
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}
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return (fetched<celt) ? S_FALSE : S_OK;
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}
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HRESULT CDevicesEnum::Skip(
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ULONG celt
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)
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{
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DWORD remaining = Count-Position;
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if(remaining<celt) {
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Position = Count;
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return S_FALSE;
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} else {
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Position += (DWORD)celt;
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return S_OK;
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}
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}
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HRESULT CDevicesEnum::Reset(
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)
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{
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Position = 0;
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return S_OK;
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}
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HRESULT CDevicesEnum::Clone(
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IEnumVARIANT ** ppEnum
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)
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{
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*ppEnum = NULL;
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HRESULT hr;
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CComObject<CDevicesEnum> *pEnum = NULL;
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hr = CComObject<CDevicesEnum>::CreateInstance(&pEnum);
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if(FAILED(hr)) {
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return hr;
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}
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if(!pEnum) {
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return E_OUTOFMEMORY;
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}
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if(!pEnum->CopyDevices(pDevices,Count)) {
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delete pEnum;
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return E_OUTOFMEMORY;
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}
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pEnum->Position = Position;
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pEnum->AddRef();
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*ppEnum = pEnum;
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return S_OK;
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}
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BOOL CDevicesEnum::CopyDevices(CDevice **pArray, DWORD NewCount)
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{
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DWORD c;
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if(pDevices) {
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delete [] pDevices;
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pDevices = NULL;
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}
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Count = 0;
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Position = 0;
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pDevices = new CDevice*[NewCount];
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if(!pDevices) {
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return FALSE;
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}
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for(c=0;c<NewCount;c++) {
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pArray[c]->AddRef();
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pDevices[c] = pArray[c];
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if(!pDevices[c]) {
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Count = c;
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return FALSE;
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}
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}
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Count = NewCount;
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return TRUE;
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}
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