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Jun 2nd, 2009

Can't open "DLL" File

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Hi,

Could you please show me where my error is?
I have created one "DLL" file by myself. Then, I want to reuse it in another project, but the system prompt error message whenever I call that "DLL" function.

I created "DLL" with "ActiveXDll". The following is my dll code.

Visual Basic 4 / 5 / 6 Syntax (Toggle Plain Text)
Public Function Adding2(ByVal x As Integer, ByVal y As Integer) As Integer
    Adding = x + y
End Function
Public Function Adding2(ByVal x As Integer, ByVal y As Integer) As Integer
    Adding = x + y
End Function

After compiling, I get "project.dll". Finally, I declare this dll's function as below.

Visual Basic 4 / 5 / 6 Syntax (Toggle Plain Text)
Public Declare Function Adding2 Lib "project1.dll" (ByVal x As Integer, ByVal y As Integer) As Integer
Public Declare Function Adding2 Lib "project1.dll" (ByVal x As Integer, ByVal y As Integer) As Integer

Error, run time error "53", is "File not found".

Visual Basic 4 / 5 / 6 Syntax (Toggle Plain Text)
Private Sub Command1_Click()
    Label1.Caption = Adding2(5, 4)
End Sub
Private Sub Command1_Click()
    Label1.Caption = Adding2(5, 4)
End Sub

if I declare as

Visual Basic 4 / 5 / 6 Syntax (Toggle Plain Text)
Public Declare Function Adding2 Lib "C:\Documents and Settings\Zawpai\Desktop\test extsiting file 3\project1.dll" (ByVal x As Integer, ByVal y As Integer) As Integer
Public Declare Function Adding2 Lib "C:\Documents and Settings\Zawpai\Desktop\test extsiting file 3\project1.dll" (ByVal x As Integer, ByVal y As Integer) As Integer

, it shows "run time error 453". can't find dll entry point.

How should I solve above problem? Please give me some suggestion.

regards,
zawpai

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zawpai

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Jun 2nd, 2009

Re: Can't open "DLL" File

Okay, did you move your project.dll into the same folder as your new project that wants to call it or did you move the project dll to the \windows\system32\ directory? Did you register the dll?

Good Luck

vb5prgrmr

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Posting Virtuoso

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Jun 3rd, 2009

Re: Can't open "DLL" File

Hi vb5prgrmr,

Yes, I copy dll file in the same folder.

did you move the project dll to the \windows\system32\ directory?
yes, I put the dll in system32.

Did you register the dll?
Yes, I did.

Would you like to run my sample program?

Anyone can me?

regards,
zawpai

zawpai

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Jun 3rd, 2009

Re: Can't open "DLL" File

Hi,

First Open a New Project, Goto References, Browse and add the Dll, from the list (Project1.dll)
And Declare like this :

Dim TempCls As New Project1.MyClass
Text1.Text = TempCls.Adding2(4, 10)

The procedure you have declared is for WIN API's..

Regards
Veena

Last edited by QVeen72; Jun 3rd, 2009 at 2:48 am.

QVeen72

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Posting Shark

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Jun 3rd, 2009

Re: Can't open "DLL" File

Hi,

Also, I noticed, there is a problem in your function:

Public Function Adding2(ByVal x As Integer, ByVal y As Integer) As Integer
'Adding = x + y
' Above line has to be name of function
Adding2 = x + y
End Function

Regards
Veena

Last edited by QVeen72; Jun 3rd, 2009 at 2:57 am.

QVeen72

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Posting Shark

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Jun 3rd, 2009

Re: Can't open "DLL" File

Hi QVeen72,

Thank you for your help. Now, my coding is running well.

May I ask you another question?
Why some dll files don't need to do "browse" and "add"?

I saw they only need to declare function prototype and the function of dll flie can be used directly. Their coding also doesn't need to create as object type. They only put their dll file in the same folder.

Where is the difference with our method?

For my understanding is that I create dll as class type. So, we have to declare as object type before we use its function. Then, we also don't need to declare function prototype.

regards,
zawpai

zawpai

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Jun 3rd, 2009

Re: Can't open "DLL" File

Click to Expand / Collapse Quote originally posted by zawpai ...

Hi QVeen72,
Why some dll files don't need to do "browse" and "add"?
zawpai

If the DLL File is Already Registered using Regsvr or any other method, , it automatically appers on the List.

But when you have created a new dll, it may not have been registered, so it does not apper on the list. If you browse and Add, VB6 Automatically Registers the dll for you..
Once you do that, you can notice, if you open a new project, this New dll will appear on the list..

Regards
Veena

QVeen72

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Posting Shark

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Jun 3rd, 2009

Re: Can't open "DLL" File

The reason for the difference between the need for an API call and browse and add is the difference between a standard dll and an activex dll.

Good Luck

vb5prgrmr

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Posting Virtuoso

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Jun 4th, 2009

Re: Can't open "DLL" File

Hi all,

Thank you for all of your information.

Best regards,
zawpai

zawpai

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Jan 6th, 2010

Re: Can't open "DLL" File

i created One ActiveX DLL and i want to reuse in other vb program.
I declare the procedure which i want to use in my vb program, "Private Declare Sub CreateFile Lib "FileUtil.dll" _
(ByVal FilePath As String, ByVal FreeFile As Integer, ByVal UniCodeTF As String)".I already registered this DLL. I copied the dll in vb program folder , copied to \windows\system32\ and already registered. But still not working, give me the error as "Can't find DLL entry point....."
Please help me!

Thanks!

yimon

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