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123 lines
2.4 KiB
123 lines
2.4 KiB
// StringsEnum.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 "StringsEnum.h"
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/////////////////////////////////////////////////////////////////////////////
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//
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CStringsEnum::~CStringsEnum()
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{
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DWORD c;
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if(pMultiStrings) {
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for(c=0;c<Count;c++) {
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SysFreeString(pMultiStrings[c]);
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}
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delete [] pMultiStrings;
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}
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}
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HRESULT CStringsEnum::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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ULONG i;
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BSTR b;
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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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b = SysAllocStringLen(pMultiStrings[Position],SysStringLen(pMultiStrings[Position]));
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if(!b) {
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for(i=0;i<fetched;i++) {
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VariantClear(&rgVar[i]);
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}
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return E_OUTOFMEMORY;
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}
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V_VT(&rgVar[fetched]) = VT_BSTR;
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V_BSTR(&rgVar[fetched]) = b;
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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 CStringsEnum::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 CStringsEnum::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 CStringsEnum::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<CStringsEnum> *pEnum = NULL;
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hr = CComObject<CStringsEnum>::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->CopyStrings(pMultiStrings,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 CStringsEnum::CopyStrings(BSTR *pArray, DWORD NewCount)
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{
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DWORD c;
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if(pMultiStrings) {
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delete [] pMultiStrings;
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pMultiStrings = NULL;
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}
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Count = 0;
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Position = 0;
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pMultiStrings = new BSTR[NewCount];
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if(!pMultiStrings) {
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return FALSE;
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}
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for(c=0;c<NewCount;c++) {
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pMultiStrings[c] = SysAllocStringLen(pArray[c],SysStringLen(pArray[c]));
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if(!pMultiStrings[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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