Accessing a class from DLL
Hello,
I'm not an experienced VB developer, I focus mainly on C/C++ and would need assistance. I have been given some sample code that I need to integrate in a project:
Dim DMApp As New SomeClass.Application
Dim Lib As SomeClass.Library
Dim Prof As SomeClass.Profile
Then, I was informed that I would need to "reference" the
* fsplugin.dll
* pcdclient.dll
DLLs. Now, how do I reference these DLLs, and how do I access the classes and tell VB that it needs to look for the SomeClass class in the DLLs?
I ran across something like this:
Dim oVBObject As Object
Dim DummyVar as Variant
Set oVBObject = CreateObject("DLLName.Clas
and am wondering whether I can do that, just like
Dim oVBObject As Object
Set oVBObject = CreateObject("fsplugin.Som
and then do
Dim DMApp As New oVBObject.Application
Dim Lib As oVBObject.Library
Dim Prof As oVBObject.Profile
Am I completely off track? Did those guys give me enough information? I feel like I'm missing something - like how do I know which DLL I really need, and how do I declare it etc.?
Thanks for any hints!
Flo.
I'm not an experienced VB developer, I focus mainly on C/C++ and would need assistance. I have been given some sample code that I need to integrate in a project:
Dim DMApp As New SomeClass.Application
Dim Lib As SomeClass.Library
Dim Prof As SomeClass.Profile
Then, I was informed that I would need to "reference" the
* fsplugin.dll
* pcdclient.dll
DLLs. Now, how do I reference these DLLs, and how do I access the classes and tell VB that it needs to look for the SomeClass class in the DLLs?
I ran across something like this:
Dim oVBObject As Object
Dim DummyVar as Variant
Set oVBObject = CreateObject("DLLName.Clas
and am wondering whether I can do that, just like
Dim oVBObject As Object
Set oVBObject = CreateObject("fsplugin.Som
and then do
Dim DMApp As New oVBObject.Application
Dim Lib As oVBObject.Library
Dim Prof As oVBObject.Profile
Am I completely off track? Did those guys give me enough information? I feel like I'm missing something - like how do I know which DLL I really need, and how do I declare it etc.?
Thanks for any hints!
Flo.
This all depends if your DLL is an activeX DLL or a standard windows DLL?
ASKER
Well, I haven't been told what it is, but I am 99% sure that it's a standard windows DLL. They don't do any other ActiveX stuff - so let's say safely assume it's a standard Windows DLL.
Does that help?
Does that help?
ASKER CERTIFIED SOLUTION
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O one thing missing from your code:
for all three you need to set the variable (form load is a good spot but can be in subs or functions)
ex:
Dim DMApp As SomeClass.Application
should have a matching:
set DMApp = new SomeClass.Application
Hope that helps...
for all three you need to set the variable (form load is a good spot but can be in subs or functions)
ex:
Dim DMApp As SomeClass.Application
should have a matching:
set DMApp = new SomeClass.Application
Hope that helps...
SOLUTION
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To access this solution, you must be a member of Experts Exchange.
To make one thing clear here, If its a standard windows DLL than you should see exported functions in the DLL. If this is the case you can call these functions using (Private Declare Function ExportName lib "Libraryname.dll" (parameters, etc..). However without knowing the parameters for the function your not going to make any progress.
ASKER
One thing that I'm confused about is how to handle classes.
I think I know how to reference a function in a DLL, e.g.
Private Declare Function MySpecialFunction Lib "mydll.dll" (ByVal FirstParm As Long, ByVal SecondParm As Long)
but how does this help - or how do I declare this - when I am referencing objects?
Dim DMApp As New SomeClass.Application
Dim Lib As SomeClass.Library
Dim Prof As SomeClass.Profile
I followed justchat's advise and when to Project -> References and added both the DLLs in there. However, when I compile my project I get the following error:
"Compile error" "User-defined type not defined"
Here is the code so far:
0:Dim DocsObject As Object
1:Set DocsObject = CreateObject("FsPlugin.DOC
2:Dim DMApp As DocsObject.Application
The error appears in line 2. I'm currently waiting for the documentation on this software but having the DLLs (fsplugin.dll and pcdclient.dll) I feel that I should get it to work?
Thanks!
I think I know how to reference a function in a DLL, e.g.
Private Declare Function MySpecialFunction Lib "mydll.dll" (ByVal FirstParm As Long, ByVal SecondParm As Long)
but how does this help - or how do I declare this - when I am referencing objects?
Dim DMApp As New SomeClass.Application
Dim Lib As SomeClass.Library
Dim Prof As SomeClass.Profile
I followed justchat's advise and when to Project -> References and added both the DLLs in there. However, when I compile my project I get the following error:
"Compile error" "User-defined type not defined"
Here is the code so far:
0:Dim DocsObject As Object
1:Set DocsObject = CreateObject("FsPlugin.DOC
2:Dim DMApp As DocsObject.Application
The error appears in line 2. I'm currently waiting for the documentation on this software but having the DLLs (fsplugin.dll and pcdclient.dll) I feel that I should get it to work?
Thanks!
ASKER
I was able to add the DLLs that I was given as references and that actually did the trick. I was then able to solve the problem, turns out the sample code that I was given wasn't exactly good and I had to tweak it.
There was never any DOCSObjects object in there, it was just an "Application", "Library" and "Profile" object. Just referencing those by itself worked like a charm.
Thanks again.
There was never any DOCSObjects object in there, it was just an "Application", "Library" and "Profile" object. Just referencing those by itself worked like a charm.
Thanks again.