Using the custom submit functionality of InfoPath it is possible to submit a form directly to a Windows Sharepoint Form Library using the following code.

function XDocument::OnSubmitRequest(eventObj)

{

    // If the submit operation is successful, set

    // eventObj.ReturnStatus = true

    var fSuccessful = false;

    // Set the URL of the file that you want to submit here.

    var strUrl = "http://ServerName/SiteName/DocumentLibraryName/testform.xml";

    try

    {

        // Create an xmlhttp object.

        var oXmlHttp = new ActiveXObject("MSXML2.XMLHTTP");

        // Check whether the document with the same name already exists on SharePoint Team Services (STS).

        oXmlHttp.Open("HEAD", strUrl, false);

        oXmlHttp.Send();

        //  No document with the URL has been found. Continue to submit.

        // If you must replace the original file, you must call

        // oXmlHttp.Open("DELETE", strUrl, false) to delete the document

        // on STS first.

        if (oXmlHttp.Status == 404)

        {

            // Put the document on STS.

            oXmlHttp.Open("PUT", strUrl, false);

            oXmlHttp.Send(XDocument.DOM.xml);

            //  A 200 status code or a 201 status code indicates that the form has been submitted successfully.

            if (oXmlHttp.Status == 200 || oXmlHttp.Status == 201)

            {

                fSuccessful = true;

            }

        }

    }

    catch (ex){}

    if (fSuccessful)

    {

        XDocument.UI.Alert("Document submitted successfully!");

        eventObj.ReturnStatus = true;

    }

    else

    {

        eventObj.ReturnStatus = false;

    }

}

For more information about this take a look at the following support article.

How To: Programmatically Submit an InfoPath Form to a SharePoint Team Services Document Library

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