IWebBrowser2 simulating left click - c++

Question

What I wan't to achieve is to simulate left click in web browoser created with IWebBrowser2 class.
Current code
if (SUCCEEDED(OleInitialize(NULL))){
IWebBrowser2* pBrowser2;
CoCreateInstance(CLSID_InternetExplorer, NULL, CLSCTX_LOCAL_SERVER,
IID_IWebBrowser2, (void**)&pBrowser2);
if (pBrowser2){
VARIANT vEmpty;
VariantInit(&vEmpty);
BSTR bstrURL = SysAllocString(L"http://google.pl");
HRESULT hr = pBrowser2->Navigate(bstrURL, &vEmpty, &vEmpty, &vEmpty, &vEmpty);
if (SUCCEEDED(hr))
{
pBrowser2->put_Visible( VARIANT_FALSE );
pBrowser2->put_FullScreen( VARIANT_TRUE );
}
else
{
pBrowser2->Quit();
}
srand( time( NULL ) );
Sleep( ( std::rand() % 5000 ) + 5000 );
if(std::rand() % 100 > chance ){
SysFreeString(bstrURL);
pBrowser2 -> Release();
return;
}
HWND handle;
if( pBrowser2 -> get_HWND( ( long *)&handle ) != S_OK ){
return;
}
IServiceProvider* pServiceProvider = NULL;
if (SUCCEEDED(pBrowser2->QueryInterface(IID_IServiceProvider, (void**)&pServiceProvider))){
IOleWindow* pWindow = NULL;
if (SUCCEEDED(pServiceProvider->QueryService(
SID_SShellBrowser,
IID_IOleWindow,
(void**)&pWindow))){
HWND hwndBrowser = NULL;
if (SUCCEEDED(pWindow->GetWindow(&hwndBrowser))){
RECT windowRect;
GetWindowRect( hwndBrowser , &windowRect );
for( int i = 0 ; i < 100 ; i++ ){
//just for test
int positionX = ( ( std::rand() ) % ( windowRect.right - windowRect.left ) ) + windowRect.left;
int positionY = ( ( std::rand() ) % ( windowRect.bottom - windowRect.top ) ) + windowRect.top;
printf( "%d | %d\n",positionX,positionY);
PostMessage( hwndBrowser, WM_LBUTTONDOWN, 0, MAKELPARAM(positionX,positionY) );
Sleep( 10 );
PostMessage ( hwndBrowser, WM_LBUTTONUP, 0, MAKELPARAM(positionX,positionY) );
}
}
pWindow->Release();
}
pServiceProvider->Release();
}
pBrowser2->put_Visible(VARIANT_TRUE);
SysFreeString(bstrURL);
pBrowser2 -> Release();
}
OleUninitialize();
}
but nothing happen. Also I tried SendMessage and with/without window visible.
Second approach would be access to dom and try to invoke click event but is this possible ?