Get All External References for Drawing Example (C#)

//-----------------------------------------
// Preconditions:
// 1. Read the SolidWorks Document Manager API
//    Getting Started topic and ensure that
//    the required DLLs have been registered.
// 2. Copy and paste this module into a C#
//    console application in Microsoft Visual Studio.
// 3. Substitute the name of drawing for
//    drawing_document_with_external_references.
// 4. Add the SolidWorks.Interop.swdocumentmgr.dll
//    reference to the project.
// 5. Substitute your_license_code with your SolidWorks
//    Document Manager license key.
// 6. Compile and run this program in Debug mode.
//
// Postconditions: Inspect the Immediate Window.
//------------------------------------------

using SolidWorks.Interop.swdocumentmgr;
using System;
using System.Diagnostics;
using System.Collections.Generic;
using System.Text;

class Program
{
    static void Main(string[] args)
    {
        const string sLicenseKey = "your_license_code";
        //Specify your license key
        const string sDocFileName = "drawing_document_with_external_references";


        SwDMClassFactory swClassFact = default(SwDMClassFactory);
        SwDMApplication swDocMgr = default(SwDMApplication);
        SwDMDocument13 swDoc = default(SwDMDocument13);
        SwDMSearchOption swSearchOpt = default(SwDMSearchOption);
        SwDmDocumentType nDocType = 0;
        SwDmDocumentOpenError nRetVal = 0;
        string[] vDependArr = null;

        // Determine type of SolidWorks file based on file extension

        if (sDocFileName.EndsWith("slddrw"))
        {
            nDocType = SwDmDocumentType.swDmDocumentDrawing;
        }
        else
        {
            // Not a drawing,
            nDocType = SwDmDocumentType.swDmDocumentUnknown;

            // So do not open
            return;
        }

        swClassFact = new SwDMClassFactory();
        swDocMgr = (SwDMApplication)swClassFact.GetApplication(sLicenseKey);
        swSearchOpt = swDocMgr.GetSearchOptionObject();
        swDoc = (SwDMDocument13)swDocMgr.GetDocument(sDocFileName, nDocType, false, out nRetVal);
        Debug.Assert(SwDmDocumentOpenError.swDmDocumentOpenErrorNone == nRetVal);

        Debug.Print("File = " + swDoc.FullName);
        object vBrokenRefs = null;
        object vIsVirtuals = null;
        object vTimeStamps = null;

        vDependArr = (string[])swDoc.GetAllExternalReferences4(swSearchOpt, out vBrokenRefs, out vIsVirtuals, out vTimeStamps);

        if ((vDependArr == null)) return;

        Debug.Print("External references:");
        foreach (string vDepend in vDependArr)
        {
            Debug.Print(" " + vDepend);
        }
        Debug.Print("Reference statuses as defined in swDmReferenceStatus");
        foreach (SwDmReferenceStatus brokenRef in (SwDmReferenceStatus[])vBrokenRefs)
        {
            Debug.Print(" " + brokenRef);
        }
        Debug.Print("Virtual component?");
        foreach (Boolean isVirtual in (Boolean[])vIsVirtuals)
        {
            Debug.Print(" " + isVirtual);
        }
        Debug.Print("Timestamps");
        foreach (Double timeStamp in (Int32[])vTimeStamps)
        {
            Debug.Print(" " + timeStamp);
        }

    }
}