Victor Charles
asked on
Help with adding DLL file in Windows project
Hello,
A .NET project was converted to a DLL file to be used with another project. However when attempting to add the DLL file under the reference sections, I receive the following error: Events not supported on HWND based channels. I had no issue with VS2010, but seems to be an issue with VS2013/2015.
Thanks,
Victor
A .NET project was converted to a DLL file to be used with another project. However when attempting to add the DLL file under the reference sections, I receive the following error: Events not supported on HWND based channels. I had no issue with VS2010, but seems to be an issue with VS2013/2015.
Thanks,
Victor
Hi Victor;
Is that the only information given on the error?
What .Net version was the dll built with?
What .Net version is the application built with?
Is that the only information given on the error?
What .Net version was the dll built with?
What .Net version is the application built with?
ASKER
Hi,
I'm running more test, will get back to you.
Thank You.
Victor
I'm running more test, will get back to you.
Thank You.
Victor
ASKER
Hi,
I was able to link to the DLL but receiving error message:
An unhandled exception of type 'System.NullReferenceExcep tion' occurred in TestProject.dll
Additional information: Object reference not set to an instance of an object.
C1Screen1.Splits(0).Displa yColumns(i ).Visible = False
,visble = False may not be recognized because the C1Screen1 is mentioned in other parts of the code such as:
C1Screen1.Height = C1Screen5.RowHeight * 10 + 10
but no error occurs.
Any ideas how to fix this error?
Thanks,
Victor
I was able to link to the DLL but receiving error message:
An unhandled exception of type 'System.NullReferenceExcep
Additional information: Object reference not set to an instance of an object.
C1Screen1.Splits(0).Displa
,visble = False may not be recognized because the C1Screen1 is mentioned in other parts of the code such as:
C1Screen1.Height = C1Screen5.RowHeight * 10 + 10
but no error occurs.
Any ideas how to fix this error?
Thanks,
Victor
Place a breakpoint on this line of code
.Splits(0).DisplayColumns(i).Visible = False
. When the breakpoint is hit move the cursor over each of the words C1Screen1, DisplayColumns(i) and Visible to make sure they have values.
ASKER
Fernando,
The application works ok by itself, error only occurs when I use it as a DLL to reference from another project, it works with On error resume next, but don't know why .Visible = False causes an error when the application is referenced as a DLL.
Thanks,
Victor
The application works ok by itself, error only occurs when I use it as a DLL to reference from another project, it works with On error resume next, but don't know why .Visible = False causes an error when the application is referenced as a DLL.
Thanks,
Victor
Victor;
When you receive this exception, "Object reference not set to an instance of an object", it is saying that some object in this statement, C1Screen1.Splits(0).Displa yColumns(i ).Visible = False, was NOT created before it was used. If you do what I asked in my last post we may be able to track down what is the issue. We are looking for those values when that line causes the exception not when it works.
When you receive this exception, "Object reference not set to an instance of an object", it is saying that some object in this statement, C1Screen1.Splits(0).Displa
ASKER
Fernando,
I put a breakpoint on that line using the original project but when I click on continue I don't see any values, screen goes to the code section.
My point was I'm not getting that error when I run the application by itself, the error only occurs when I convert it into a DLL, for some reason The DLL does not work with .Visible = False when reference from another application. Some of the columns contain blank values which maybe causing the error when converted to a DLL.
Thanks,
Victor
I put a breakpoint on that line using the original project but when I click on continue I don't see any values, screen goes to the code section.
My point was I'm not getting that error when I run the application by itself, the error only occurs when I convert it into a DLL, for some reason The DLL does not work with .Visible = False when reference from another application. Some of the columns contain blank values which maybe causing the error when converted to a DLL.
Thanks,
Victor
Victor;
You state the following, "My point was I'm not getting that error when I run the application by itself, the error only occurs when I convert it into a DLL,", A couple of questions.
What is the original type of the application, Windows Form, a Console app or something else?
How do you convert it into a dll?
How do you call it from the application you use it in?
You state the following, "My point was I'm not getting that error when I run the application by itself, the error only occurs when I convert it into a DLL,", A couple of questions.
What is the original type of the application, Windows Form, a Console app or something else?
How do you convert it into a dll?
How do you call it from the application you use it in?
ASKER
Hi Fernando,
Sorry for the late reply, just back home.
The original applications is a Windows Form. I converted it into a class library (DLL) using the application than added it in the reference section of another application and accessing it with the following code:
Dim frm2 As New TestProject.Form1
frm2.Show()
DLL seems to have some limitation, for example Exit sub and Form.Visible = True returns in error when trying to create the DLL. I had to comment them out to create the DLL.
Thanks,
Victor
Sorry for the late reply, just back home.
The original applications is a Windows Form. I converted it into a class library (DLL) using the application than added it in the reference section of another application and accessing it with the following code:
Dim frm2 As New TestProject.Form1
frm2.Show()
DLL seems to have some limitation, for example Exit sub and Form.Visible = True returns in error when trying to create the DLL. I had to comment them out to create the DLL.
Thanks,
Victor
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ASKER
Fernando,
I was not clear, the steps you mentioned is what I followed. The DLL was instantiated use from2. But I noticed .visible doesn't work with a DLL.
Thanks,
Victor
I was not clear, the steps you mentioned is what I followed. The DLL was instantiated use from2. But I noticed .visible doesn't work with a DLL.
Thanks,
Victor
Can you post the app that is the dll as a zip.
can you make a public member fuction in side the DLL to make the .visible to true. and call that function in your form2.
ASKER
Hi,
Unfortunately I can't post the file. How do you make a publ8c member function?
Thanks,
Victor
Unfortunately I can't post the file. How do you make a publ8c member function?
Thanks,
Victor
Where do you initialize the form that is in the dll which you are trying to set the property Visible on?
ASKER
I initialize the form on the Form I am trying to access the DLL.
Please show the code you use in your exe to do this and identify the variable that is defined in the dll which is the Form in the dll that you are trying to set the property Visible in.
ASKER
Fernando,
This is the only code I used to access the DLL.
for some reason .visible does not work but .close does.
Dim frm2 As New TestProject.Form1
frm2.Show()
Victor
This is the only code I used to access the DLL.
for some reason .visible does not work but .close does.
Dim frm2 As New TestProject.Form1
frm2.Show()
Victor
ASKER
Thank You.
Then try to add the reference