Get PNG Preview Bitmap and Stream for Configuration Example (C#)

This example shows how to get the name of the stream and the PNG preview bitmap for a configuration in a part or assembly.

NOTE: To get the name of the stream and a preview bitmap of the sheet active when the drawing was last saved, use ISwDMDocument10::GetPreviewBitmap and ISwDMDocument10::PreviewStreamName. To get the name of the streams and the preview bitmaps for all sheets in a drawing, use ISwDMSheet2::GetPreviewPNGBitmap and ISwDMSheet2::PreviewPNGStreamName.

//---------------------------------------------------------------------------
// Preconditions:
// 1. Read the SolidWorks Document Manager API Getting Started
//    topic and ensure that the required DLLs are registered.
// 2. Copy and paste this module into a C# console application
//    in Microsoft Visual Studio.
// 3. Ensure that the specified document exists
//    (or point to another document).
// 4. Add the SolidWorks.Interop.swdocumentmgr.dll reference
//    to the project:
//    a. Right-click the solution in Solution Explorer.
//    b. Select Add Reference.
//    c. Click the Browse tab.
//    d. Load:
//   <SolidWorks_install_dir>\api\redist\SolidWorks.Interop.swdocumentmgr.dll
// 5. Add the following references to the project: System.Drawing.dll,
//    stdole.dll, Microsoft.VisualBasic.Compatibility.VB6.dll.
// 6. Substitute <your_license_code> with your SolidWorks
//    Document Manager license key.
// 7. Compile and run this program in Debug mode.
//
// Postconditions: Inspect the Output Window and the code to see
// how the API is used.
//--------------------------------------------------------------------------

using System;
using System.Diagnostics;
using System.Collections.Generic;
using System.Text;
using SolidWorks.Interop.swdocumentmgr;
using Microsoft.VisualBasic.Compatibility.VB6;
using stdole;
using System.Drawing;
class Program
{
    
    static void Main(string[] args)
    {
        
        // Substitute the path and name of your file for the following path and file name
        
        const string sDocFileName = "C:\\Program Files\\SolidWorks Corp\\SolidWorks\\samples\\tutorial\\multibody\\multi_inter.sldprt";
        //Specify document
        const string sExtractDir = "c:\\temp\\";
        
        SwDMClassFactory swClassFact = default(SwDMClassFactory);
        SwDMApplication swDocMgr = default(SwDMApplication);
        SwDMDocument swDoc = default(SwDMDocument);
        SwDMConfigurationMgr swCfgMgr = default(SwDMConfigurationMgr);
        string[] vCfgNameArr = null;
        SwDMConfiguration7 swCfg = default(SwDMConfiguration7);
        IPictureDisp pPreview = default(IPictureDisp);
        SwDmDocumentType nDocType = 0;
        SwDmDocumentOpenError nRetVal = 0;
        SwDmPreviewError nRetVal2 = 0;
        Image image = default(Image);


        // Determine type of SolidWorks file based on file extension

        if (sDocFileName.EndsWith("sldprt"))
        {
            nDocType = SwDmDocumentType.swDmDocumentPart;
        }
        else if (sDocFileName.EndsWith("sldasm"))
        {
            nDocType = SwDmDocumentType.swDmDocumentAssembly;
        }
        else if (sDocFileName.EndsWith("slddrw"))
        {
            nDocType = SwDmDocumentType.swDmDocumentDrawing;
        }
        else
        {
            // Not a SolidWorks file
            nDocType = SwDmDocumentType.swDmDocumentUnknown;

            // So cannot open
            return;
        }

        // Because drawing documents do not have configurations,
        // only continue running the macro if the document
        // is a part or assembly document
        
        if ((nDocType != SwDmDocumentType.swDmDocumentDrawing)) {
            
            swClassFact = new SwDMClassFactory();
            swDocMgr = swClassFact.GetApplication("<your_license_code>");
            //Specify license key
            swDoc = (SwDMDocument)swDocMgr.GetDocument(sDocFileName, nDocType, false, out nRetVal);
            Debug.Assert(SwDmDocumentOpenError.swDmDocumentOpenErrorNone == nRetVal);
            swCfgMgr = swDoc.ConfigurationManager;
            
            Debug.Print("File = " + swDoc.FullName);
            Debug.Print(" Active configuration name = " + swCfgMgr.GetActiveConfigurationName());
            vCfgNameArr = (string[])swCfgMgr.GetConfigurationNames();
            
            foreach (string vCfgName in vCfgNameArr) {
                
                swCfg = (SwDMConfiguration7)swCfgMgr.GetConfigurationByName(vCfgName);
                
                // SwDMConfiguration7.GetPreviewPNGBitmap throws an unmanaged COM exception
                // for out-of-process C# console applications.
                // Try the following code in VSTA macros and SolidWorks add-ins only.
                //pPreview = (IPictureDisp)swCfg.GetPreviewPNGBitmap(out nRetVal2);
                //image = Support.IPictureDispToImage(pPreview);
                //image.Save(sExtractDir + vCfgName + ".PNG");
                
                Debug.Print(" " + vCfgName);
                Debug.Print(" PNG preview stream = " + swCfg.PreviewPNGStreamName);
                    
                Debug.Print(" ");
            }
            swDoc.CloseDoc();
        }
    }
}