Angel Hernández

// Get feeds from a given Url through WWSAPI

EXPORT WCHAR* GetFeeds(WCHAR* szUrl, int cbResults) {

    WCHAR* temp = NULL;

    WS_HEAP* heap = NULL;

    WCHAR retval[MAX_SIZE]; // 128Kb (It should be enough to avoid WS_E_QUOTA_EXCEEDED error)

    WS_ERROR* error = NULL;

    ULONG propertiesCount = 0;

    WS_SERVICE_PROXY* proxy = NULL;

    WS_CHANNEL_PROPERTY channelProps[2]; 

    WS_STRING serviceUrl = WS_STRING_VALUE(L"http://localhost/DemoSvc/RSSFeedService.asmx");

    WS_ENDPOINT_ADDRESS endpoint = { serviceUrl}; 

    WS_ENVELOPE_VERSION soapVersion = WS_ENVELOPE_VERSION_SOAP_1_1; // Our Webservice is WsiProfiles.BasicProfile1_1 compliant

    WS_ADDRESSING_VERSION addressingVersion = WS_ADDRESSING_VERSION_TRANSPORT;

    // Set channel's properties

    channelProps[propertiesCount].id = WS_CHANNEL_PROPERTY_ENVELOPE_VERSION;

    channelProps[propertiesCount].value = &soapVersion;

    channelProps[propertiesCount].valueSize = sizeof(soapVersion);

    propertiesCount++;

    // Set addressing's properties

    channelProps[propertiesCount].id = WS_CHANNEL_PROPERTY_ADDRESSING_VERSION;

    channelProps[propertiesCount].value = &addressingVersion;

    channelProps[propertiesCount].valueSize = sizeof(addressingVersion);

    propertiesCount++;

    // Can we create an WsError and WsHeap objects?

    if (SUCCEEDED(WsCreateError(NULL, NULL, &error)) && SUCCEEDED(WsCreateHeap(MAX_SIZE, TRIM_SIZE, NULL, NULL, &heap, error))) {

        // Can we create a proxy based on the service?

        if  (SUCCEEDED(WsCreateServiceProxy(WS_CHANNEL_TYPE_REQUEST, WS_HTTP_CHANNEL_BINDING, NULL, NULL, NULL, 

            channelProps, propertiesCount, &proxy, error))) {

                // Can we open the proxy object?

                if  (SUCCEEDED(WsOpenServiceProxy(proxy, &endpoint, NULL, error))) {

                    // If we're able to invoke the service then copy the results to another variable because if

                    // we don't we lose the response after freeing the heap

                    if (SUCCEEDED(RSSFeedServiceSoap12_RetrieveFeeds(proxy, szUrl, cbResults, &temp, heap, NULL, NULL, NULL, error))) 

                        wcscpy_s(retval, temp);

                }

        }

    }

    // Deallocate and free resources

    if (error != NULL)

        WsFreeError(error);

    if (proxy != NULL) {

        WsCloseServiceProxy(proxy, NULL, error);

        WsFreeServiceProxy(proxy);

    }

    if (heap != NULL)

        WsFreeHeap(heap);

    return retval;

}

#include "stdafx.h"

typedef WCHAR* (*myCallback) (WCHAR*, int);

int _tmain(int argc, _TCHAR* argv[]) {

    HINSTANCE hInstance;

    myCallback ptrToFunc;

    WCHAR* results = NULL;

    if ((hInstance = LoadLibrary(L"C:\\Users\\angel.hernandez\\Desktop\\WWSAPI\\WWSAPIDemo\\x64\\Debug\\WWSAPIDemo.dll")) != NULL) {

        if ((ptrToFunc = (myCallback) GetProcAddress(hInstance, "GetFeeds")) != NULL) {

            results = ptrToFunc(L"http://localhost/MSDN.xml", -1);

            wprintf(L"\n%ls\n", results);

            FreeLibrary(hInstance);

            printf("\n\nPress any key to exit...\n");

            _getch();

        }

    }

    return 0;

}

// Execute XPATH Query based on feeds retrieved through WWSAPI

EXPORT void GetItem(WCHAR* szUrl, WCHAR* szItemName) {

    WCHAR retval[TRIM_SIZE];

    WCHAR* results = NULL;

    BSTR nodeContent = NULL;

    WCHAR xPathQueryBuffer[TRIM_SIZE];

    IXMLDOMDocumentPtr docPtr = NULL;

    IXMLDOMNodePtr selectedNode = NULL;

    if ((results = GetFeeds(szUrl, -1)) != NULL &&  wcslen(results) > 0) {

        CoInitialize(NULL);

        docPtr.CreateInstance("Msxml2.DOMDocument.6.0");

        wsprintf(xPathQueryBuffer, L"/rss/items/item[starts-with(@title,'%ls')]", szItemName);

        if (SUCCEEDED(docPtr->loadXML(_bstr_t(results), NULL))) {

            if (SUCCEEDED(docPtr->selectSingleNode(_bstr_t(xPathQueryBuffer), &selectedNode))) {

                nodeContent = SysAllocString(retval);

                selectedNode->get_xml(&nodeContent);

                MessageBox(NULL, nodeContent, L"XPath Query Results", NULL);

                SysFreeString(nodeContent);

            }

        }

    }

}

[DllImport(@"C:\Users\angel.hernandez\Desktop\WWSAPI\WWSAPIDemo\x64\Debug\WWSAPIDemo.dll", CharSet = CharSet.Unicode)]

public static extern IntPtr GetFeeds(IntPtr szUrl, int cbResults);

private void btnTestWWSAPI_Click(object sender, EventArgs e) {

    IntPtr szUrl = Marshal.StringToBSTR("http://localhost/MSDN.xml");

    MessageBox.Show(Marshal.PtrToStringUni(GetFeeds(szUrl, -1)));

    Marshal.FreeBSTR(szUrl);

}

<!-- Data Provider-->

<Window.Resources>

    <XmlDataProvider x:Key="xmlFeeds" IsAsynchronous="True" XPath="/rss/items/item"/>

</Window.Resources>

<Grid Name="grdFeeds" Margin="0,75,0,12">

    <!-- Binding Source-->

    <ListView Margin="11.432,6" Name="lstFeeds"  

             ItemsSource="{Binding Source={StaticResource xmlFeeds} }" MouseDoubleClick="lstFeeds_MouseDoubleClick">

        <ListView.View>

            <GridView x:Name="grdFeedItems">

                <GridViewColumn Header="Title" x:Name="grcTitle" Width="100" DisplayMemberBinding="{Binding XPath=@title}"/>

                <GridViewColumn Header="Publishing Date" x:Name="grcPublishingDate" Width="100" DisplayMemberBinding="{Binding XPath=@publishingDate}"/>

                <GridViewColumn Header="Url" x:Name="grcUrl" Width="100" DisplayMemberBinding="{Binding XPath=@url}" />

            </GridView>

        </ListView.View>

    </ListView>

</Grid>

private void btnExecuteOperation_Click(object sender, RoutedEventArgs e) {

    XmlDocument feeds = new XmlDocument();

    IntPtr szUrl = IntPtr.Zero, szItemName = IntPtr.Zero;

    XmlDataProvider xmlFeeds = TryFindResource("xmlFeeds") as XmlDataProvider;

    try {

        switch (cboOperations.SelectedIndex) {

            case 0:

                using (RSSFeedService proxy = new RSSFeedService())

                    feeds.LoadXml(proxy.RetrieveFeeds("http://localhost/MSDN.xml", -1));

                xmlFeeds.Document = feeds;

                break;

            case 1:

                szUrl = Marshal.StringToBSTR("http://localhost/MSDN.xml");

                feeds.LoadXml(Marshal.PtrToStringUni(GetFeeds(szUrl, -1)));

                Marshal.FreeBSTR(szUrl);

                xmlFeeds.Document = feeds;

                break;

            case 2:

                szUrl = Marshal.StringToBSTR("http://localhost/MSDN.xml");

                szItemName = Marshal.StringToBSTR(!string.IsNullOrEmpty(txtItemTitle.Text) ? txtItemTitle.Text : "Windows");

                GetItem(szUrl, szItemName);

                Marshal.FreeBSTR(szUrl);

                Marshal.FreeBSTR(szItemName);

                break;

        }

    } catch (Exception ex) {

        MessageBox.Show(string.Format("Oops! Something wrong just occurred\n{0}", ex.Message),

            "Exception caught", MessageBoxButton.OK, MessageBoxImage.Information);

    }

}