[VB] Runtime loading dll - Printable Version
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[VB] Runtime loading dll by J-Thread on 08-17-2004 at 01:03 PM
I have searched the whole internet (especially the msdn documentation) but I haven't found what I am looking for.
I am making something in VB.NET, and I want to use functions of dll's. Of course it is possible by adding the references in design mode, but that is not what I want.
It's just like something patchou did in msgplus (but I think he did it with C++). The program reads the register, reads a string with the namespace of the dll, and loads it. I tried to use:
code:but that didn't work... Anyone who knows how to do it? (if you know how to do it in VB6, that's good also..)
Dim object = System.Activator.CreateInstance("dllName.Classname", "URIToAssembly")
RE: [VB] Runtime loading dll by RaceProUK on 08-17-2004 at 09:47 PM
I don't know about VB.NET, but to use DLL functions in VB6:
code:For example, RegOpenKeyEx:
Declare Function <fn-name> Lib "<lib>" Alias "<realname>" (<args>) As <type>
code:
Declare Function RegOpenKeyEx Lib "advapi32.dll" Alias "RegOpenKeyExA" (ByVal hKey As Long, ByVal lpSubKey As String, ByVal ulOptions As Long, ByVal samDesired As Long, phkResult As Long) As Long
RE: [VB] Runtime loading dll by J-Thread on 08-18-2004 at 08:06 AM
Yes I know that, that's not the problem. But that will not work with VB dll's because they can't just share functions (unfortunatly). So that works with C++ dll's only. So I think I have to write my dll's in C++...
RE: [VB] Runtime loading dll by RaceProUK on 08-18-2004 at 08:48 AM
Vb DLL's can share functions (how do you think Plus calls VB plugins?): you just have to regsvr them.
RE: [VB] Runtime loading dll by J-Thread on 08-18-2004 at 08:53 AM
Yes of course they can, but (I think) not as C++ can. If you share functions with VB you can't use
code:can you? At least that's what I think... Correct me if I'm wrong. If you make dll's with VB you have to add them to the references and define an object like
Declare Function <fn-name> Lib "<lib>" Alias "<realname>" (<args>) As <type>
code:And I think in VB it isn't possible to do that runtime. And if it is, I want to know how. That's my question.
dim dll as new dllname.classname
RE: [VB] Runtime loading dll by RaceProUK on 08-18-2004 at 10:18 AM
Take a look at LoadLibrary() and related functions in the API.
RE: [VB] Runtime loading dll by J-Thread on 08-18-2004 at 08:03 PM
Yes thank you, i think that is what i was looking for! I haven't found a good tutorial about how to work with it, but it's a start. I'm going to test with it!
RE: [VB] Runtime loading dll by J-Thread on 08-19-2004 at 09:44 AM
YEAH! I got it. Not with loadlibrary (that's only for unmanged dll's), but like this:
code:
Dim hDLL As System.Reflection.Assembly
Dim hTyp As Type
Dim hMod As System.Reflection.MethodInfo
Dim obj As Object
hDLL = System.Reflection.Assembly.LoadFrom("MyVB.dll") ' dll in Application.StartupPath or use full path
hTyp = hDLL.GetType("MyVB.MyVB") ' Full class name
obj = Activator.CreateInstance(hTyp)
' The class is active ... now let's call its methods
hMod = hTyp.GetMethod("MyFunc")
Dim args(0) As Object ' Matching number of parameters
args(0) = 1
Msgbox("Returned value : " & hMod.Invoke(obj, args))
Read the whole thread about it here
I'm wondering why it's so hard to find this...