3 Replies Latest reply on Jul 19, 2017 4:13 PM by Sean Donnelly

    'Object reference not set to an instance of an object.' GetVar C#

    Sean Donnelly
    Sean Donnelly May 26, 2017 10:46 AM

      Basically, I have my own search using WinForms (standalone application outside of PDM) so that I can search for "base" part numbers in my search and pull in variables when I select the filename in the list. The first part works nicely and I'm trying to now pull variables from the file. I can get file information just fine, but it's breaking when I try to set my textboxes to the object string.

       

      Edit: I should mention the checkVault() is a method for getting the vault and logging in. this is not an issue as I am able to pull information using this method such as filename, path, id, etc.

       

              public void checkVault()
        {
            vault2 = null;
            if (vault1 == null)
            {
                vault1 = new EdmVault5();
            }
            vault2 = (IEdmVault7)vault1;


            if (!vault1.IsLoggedIn)
            {
                //vault1.LoginAuto("FocalPoint Vault", this.Handle.ToInt32());
                vault1.LoginAuto("FocalPoint Vault", this.Handle.ToInt32());
            }
        }

       

              private void listResults_MouseClick(object sender, MouseEventArgs e)
        {
            string configName = "Layout1";
            object Desc1 = null;
            object Desc2 = null;
            object Rev = null;
            //object StockingType = null;


            int numSel = listResults.SelectedIndex;
            if (numSel >= 0)
            {
                checkVault();


                IEdmFolder5 retFolder = default(IEdmFolder5);
                aFile = vault1.GetFileFromPath(listResults.SelectedValue.ToString(), out retFolder);


                IEdmEnumeratorVariable10 myvars = default(IEdmEnumeratorVariable10); //Set the enumeratorvariable object  
                myvars = (IEdmEnumeratorVariable10)aFile.GetEnumeratorVariable(); //Cast the enumeratorvariable object to the file  


                //myvars.GetVar("CreatedBy", configName, out CreatedBy); //Use the GetVar method  
                myvars.GetVar("CAD_Description", configName, out Desc1);
                myvars.GetVar("CAD_Description1", configName, out Desc2);
                myvars.GetVar("CAD_Revision", configName, out Rev);
                myvars.CloseFile(false); //Always close the file when done accessing card variables to avoid runtime errors  
                                         //Mymessage = Mymessage + "File ID: " + myfile.ID + System.Environment.NewLine; //Create a message with the File ID
                //breaks here
                textRev.Text = Rev.ToString();
                textDesc1.Text = Desc1.ToString();
                textDesc2.Text = Desc2.ToString();
            }




        }
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      • Categories: API
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        • Re: 'Object reference not set to an instance of an object.' GetVar C#
          Lee CS Young
          Lee CS Young May 26, 2017 1:10 PM (in response to Sean Donnelly)
          • The error is telling you exactly what the issue is, 'Rev' is a null. You could use the null-conditional operator if you're using C# 6. Other wise use a normal conditional. (i.e. textRev.Text = (Rev == null) ? string.Empty : Rev.ToString() )
          • It may not be pulling values from the file because your configName may not be correct. Try Model.
          • IIRC you don't need to call CloseFile() when you're only using GetVar().
            • Re: 'Object reference not set to an instance of an object.' GetVar C#
              Sean Donnelly
              Sean Donnelly May 30, 2017 11:21 AM (in response to Lee CS Young)

              I am still having issues even after trying your methods. I am now trying a SolidWorks template which is also not cooperating and giving me the same issue with their code. I modified it below to have my configuration name ("@") and variable name ("CAD_Revision"). As seen in the image below, the value A is present for the variable. When I run the code without the complex third MessageBox (instead simply asking for the value in RevisionObj.ToString() ) it tells me the object is not found. When I do add the third MessageBox to be similar to your recommendation, it shows blank. There is clearly a value here though. I have the latest version of the file as well.

               

              Template code: 2014 SOLIDWORKS API Help - Set Initial Revision Example (C#)

               

              Reminder, this is a standalone application reading from EPDM and is not an add-in inside of SolidWorks. Thanks for the help.

               

              Image of drawing in question, with variable clearly present:

               

              Modified section of template code:

               

              (image in case its cutoff. the preview does not show MessageBox )

               

              private void SetInitialRevisionButton_Click(System.Object sender, System.EventArgs e)
        {
            try
            {
                //Declare and create an instance of IEdmVault5
                IEdmVault5 vault = new EdmVault5();


                //Log into selected vault as the current user
                vault.LoginAuto(VaultsComboBox.Text, this.Handle.ToInt32());


                //Display a File Open dialog for user to
                //choose the files on which set the initial revision
                EdmStrLst5 PathList = default(EdmStrLst5);
                PathList = vault.BrowseForFile(this.Handle.ToInt32(), (int)EdmBrowseFlag.EdmBws_ForOpen + (int)EdmBrowseFlag.EdmBws_PermitMultipleSel + (int)EdmBrowseFlag.EdmBws_PermitVaultFiles, "SolidWorks files " + "(*.sldprt; *.sldasm; *.slddrw)|" + "*.sldprt;*.sldasm;*.slddrw|" + "All Files (*.*)|*.*||", "", "", vault.RootFolderPath, "Select Files to Set Initial Revision on");


                //Exit if the user clicks Cancel
                if (PathList == null)
                    return;


                //Traverse the selected files
                IEdmPos5 pos = default(IEdmPos5);
                pos = PathList.GetHeadPosition();
                while (!pos.IsNull)
                {
                    //Get each file path from the selected files list
                    string FilePath = null;
                    FilePath = PathList.GetNext(pos);
                    //Get the IEdmFile5 object corresponding
                    //to the path
                    IEdmFile5 FileObj = default(IEdmFile5);
                    IEdmFolder5 retfold = default(IEdmFolder5);
                    FileObj = vault.GetFileFromPath(FilePath, out retfold);


                    //Skip any files that are checked out
                    if (FileObj.IsLocked)
                    {
                        MessageBox.Show(FilePath + " is checked out." + Constants.vbCrLf + "Check it in and try again." + Constants.vbCrLf + "Skipping this file.", "File is checked out.", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                        continue;
                    }


                    //Get the value of the file data
                    //card variable named Revision
                    IEdmEnumeratorVariable8 EnumVarObj = default(IEdmEnumeratorVariable8);
                    //Keeps the file open
                    EnumVarObj = (IEdmEnumeratorVariable8)FileObj.GetEnumeratorVariable();


                    bool GetVarSuccess = false;
                    //GetVar returns a Variant
                    object RevisionObj = null;
                    GetVarSuccess = EnumVarObj.GetVar("CAD_Revision", "@", out RevisionObj);
                    EnumVarObj.CloseFile(false);
                    MessageBox.Show("Get Var");
                    MessageBox.Show(GetVarSuccess.ToString());
                    MessageBox.Show((RevisionObj == null) ? string.Empty : RevisionObj.ToString());