Windows Update Agent pure win32 APIs - c++

Question

I'm developing a sample code to get information about the Windows Updates Monitoring.
I bumped into Windows Update Agent APIs. link: http://msdn.microsoft.com/en-us/library/windows/desktop/aa387099(v=vs.85).aspx
But I'm not able to find any APIs for win32. I find only C#/.NET Interfaces.
Are there any corresponding win32 APIs?
Specifically I want to find out the "release date" of a windows update/patch.
Look forward to any suggestions and guidance.
Srivathsa

Answer 1

The WUA API includes a set of COM interfaces which can be used from C++ Apps, so try these IUpdateSearcher, IUpdateSession and IUpdate.
Check this sample c++ application which retrieve the updates and the date of release.
#include "stdafx.h"
#include <wuapi.h>
#include <iostream>
#include <ATLComTime.h>
#include <wuerror.h>
using namespace std;
int _tmain(int argc, _TCHAR* argv[])
{
HRESULT hr;
hr = CoInitialize(NULL);
IUpdateSession* iUpdate;
IUpdateSearcher* searcher;
ISearchResult* results;
BSTR criteria = SysAllocString(L"IsInstalled=1 or IsHidden=1 or IsPresent=1");
hr = CoCreateInstance(CLSID_UpdateSession, NULL, CLSCTX_INPROC_SERVER, IID_IUpdateSession, (LPVOID*)&iUpdate);
hr = iUpdate->CreateUpdateSearcher(&searcher);
wcout << L"Searching for updates ..."<<endl;
hr = searcher->Search(criteria, &results);
SysFreeString(criteria);
switch(hr)
{
case S_OK:
wcout<<L"List of applicable items on the machine:"<<endl;
break;
case WU_E_LEGACYSERVER:
wcout<<L"No server selection enabled"<<endl;
return 0;
case WU_E_INVALID_CRITERIA:
wcout<<L"Invalid search criteria"<<endl;
return 0;
}
IUpdateCollection *updateList;
IUpdate *updateItem;
LONG updateSize;
BSTR updateName;
DATE retdate;
results->get_Updates(&updateList);
updateList->get_Count(&updateSize);
if (updateSize == 0)
{
wcout << L"No updates found"<<endl;
}
for (LONG i = 0; i < updateSize; i++)
{
updateList->get_Item(i,&updateItem);
updateItem->get_Title(&updateName);
updateItem->get_LastDeploymentChangeTime(&retdate);
COleDateTime odt;
odt.m_dt=retdate;
wcout<<i+1<<" - "<<updateName<<" Release Date "<< (LPCTSTR)odt.Format(_T("%A, %B %d, %Y"))<<endl;
}
::CoUninitialize();
wcin.get();
return 0;
}