topic Re: Form Button Object reference not set in .NET Forum

Form Button Object reference not set

ERGCONSULT — Sat, 05 Aug 2017 15:57:20 GMT

I have written some code to create a project file based on information on a form the original code was VB6 and sense I upgraded it to VB10 when I click the cmdCreat button I get

System.NullReferenceException: Object reference not set to an instance of an object.
at CreateProjII.frmCreateProj.cmdCreate_Click(Object sender, EventArgs e)

Here is the form code

Option Explicit On

Imports Inventor
Imports System.Runtime.InteropServices
Imports Microsoft.Win32
Imports System
Imports System.IO
Imports System.Xml
Imports System.Xml.Linq

Public Class frmCreateProj

Private Sub cmdCancel_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdCancel.Click
Me.Close()
End Sub

Public Sub cmdCreate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdCreate.Click

Dim oApp As Inventor.Application
oApp = ThisApplication

Dim oDocs As Inventor.Documents
oDocs = oApp.Documents

Dim filename As String
If txtFileNum.Text = "" Then
filename = txtProj.Text & "_" & txtComp.Text
Else
filename = txtFileNum.Text
End If

Dim IpjName As String
IpjName = txtIpjName.Text

Dim projnum As String
projnum = txtProj.Text

Dim compname As String
compname = txtComp.Text

Dim Title As String
Title = txtTitle.Text

Dim vendor As String
vendor = "Gerbcon"

'create project folders
My.Computer.FileSystem.CreateDirectory("H:\Current Engineering\" & filename)
My.Computer.FileSystem.CreateDirectory("H:\Current Engineering\" & filename & "\Templates")
My.Computer.FileSystem.CreateDirectory("H:\Current Engineering\" & filename & "\Content Center Files")
My.Computer.FileSystem.CreateDirectory("H:\Current Engineering\" & filename & "\Assemblies")
My.Computer.FileSystem.CreateDirectory("H:\Current Engineering\" & filename & "\Parts")
My.Computer.FileSystem.CreateDirectory("H:\Current Engineering\" & filename & "\Drawings")
My.Computer.FileSystem.CreateDirectory("H:\Current Engineering\" & filename & "\SentItems")
My.Computer.FileSystem.CreateDirectory("H:\Current Engineering\" & filename & "\Quotes")
My.Computer.FileSystem.CreateDirectory("H:\Current Engineering\" & filename & "\Imported components")
My.Computer.FileSystem.CreateDirectory("H:\Current Engineering\" & filename & "\Notes")
My.Computer.FileSystem.CreateDirectory("H:\Current Engineering\" & filename & "\Electrical")
My.Computer.FileSystem.CreateDirectory("H:\Current Engineering\" & filename & "\Drawings" \ " txtProj.txt-1")

'Copy the Iparts folder and rename it Standard Parts
My.Computer.FileSystem.CopyDirectory("C:\NewProject\Iparts2010", "H:\Current Engineering\" & filename & "\StandardParts")
My.Computer.FileSystem.CopyDirectory("C:\NewProject\BOM", "H:\Current Engineering\" & filename & "\BOMS")

'generate ProjInfo.xml inside Templates folder
Dim B As XElement = _
<Project>
<FileNumber><%= filename %></FileNumber>
<SONumber><%= projnum %></SONumber>
<Customer><%= compname %></Customer>
<JobTitle><%= Title %></JobTitle>
</Project>

B.Add(<AdditionalSOs>
<AddSO1><%= projnum %></AddSO1>
</AdditionalSOs>) 'create element to throw additional SO numbers into starting with current SO
B.Add(<AdditionalJobTitles>
<AddJobTitle1><%= Title %></AddJobTitle1>
</AdditionalJobTitles>) 'create element to throw additional Titles into starting with current title
B.Save("H:\Current Engineering\" & filename & "\Templates\ProjInfo.xml")

'Finally, copy and modify new .ipj file (project file)
My.Computer.FileSystem.CopyFile("C:\NewProject\Temp2017.ipj", "H:\Current Engineering\" & filename & "\" & IpjName & ".ipj")

MsgBox("PROJECT BUILD COMPLETE", vbOKOnly)
Me.Close()

End Sub

End Class

Re: Form Button Object reference not set

BKSpurgeon — Mon, 07 Aug 2017 23:38:30 GMT

Hi there

When ever you see something like this - it means that the pertinent reference (in this case cmdCreat) is not pointing to an actual button/or object.

Where have you created the button? Where is your UI code?

You need to instantiate the button somewhere in your code otherwise you will get the above error.

e.g.

System.Windows.Forms.Button cmdCreat  = new System.Windows.Forms.Button();

Re: Form Button Object reference not set

ERGCONSULT — Thu, 10 Aug 2017 00:28:34 GMT

First off Thank you for taking the time to look at this,

There is nothing in the project anywhere resembling your comments and I believe all the UI is located in the StandardAddInServer.vb which is attached.

My apologies if I am not clear I am fairly new at this and I have only been maintaining the code for the past few years,

Re: Form Button Object reference not set

ActivistInvestor — Thu, 10 Aug 2017 22:46:03 GMT

@Anonymous wrote:
First off Thank you for taking the time to look at this,
There is nothing in the project anywhere resembling your comments and I believe all the UI is located in the StandardAddInServer.vb which is attached.
My apologies if I am not clear I am fairly new at this and I have only been maintaining the code for the past few years,

Your button click event handler where the exception is being thrown references variables that appear nowhere in the code you posted.

You are expecting others here to tell you what's wrong with code that you didn't post.

Try running your code in the debugger and step through the code in the event handler to find out what variable has not been initialized.

Re: Form Button Object reference not set

ERGCONSULT — Fri, 11 Aug 2017 16:00:00 GMT

I have attached the complete project in the hopes that you can point out what is missing, Here is a how I went about creating this project, I created a new project using the 2018 wizard I then added the old cod and form to the project using the add existing item feature, I then modified the code to display the button on the UI to open the form, Which works fine. If I click the cancel button the form closes without error,

I hope this is more useful than my previous posts

Thank you in advance for taking the time to guide me

Re: Form Button Object reference not set

ERGCONSULT — Fri, 11 Aug 2017 16:06:26 GMT

Please disregard my previous post I attached the original project not the current one

Current project attached to this post

Re: Form Button Object reference not set

ActivistInvestor — Sat, 12 Aug 2017 01:04:37 GMT

@Anonymous wrote:
I have attached the complete project in the hopes that you can point out what is missing, Here is a how I went about creating this project, I created a new project using the 2018 wizard I then added the old cod and form to the project using the add existing item feature, I then modified the code to display the button on the UI to open the form, Which works fine. If I click the cancel button the form closes without error,
I hope this is more useful than my previous posts
Thank you in advance for taking the time to guide me

Your project is an Inventor plug-in. This is the AutoCAD .NET programming forum.

There is a forum for Inventor customization, which is where you should be seeking help.

Regardless of what kind of project it is, to find out where the problem is, You have to

run the code in the debugger. Ask in the above forum how to go about debugging

Inventor plug-ins, if you're not sure how to do that.