Example for dll

[robertdj]

Hi

This package looks very interesting!
Can you provide an example on how to call methods from a DLL? If I have a Class Library with a single file:

namespace JuliaTest
{
    public class Foo
    {
        public double Bar(double x)
        {
            return 2 * x;
        }
    }
}

How do I call Bar from the generated dll? (Please correct me if this is the wrong way to generate the dll :-))

Thanks.

[azurefx]

Sure.

PS C:\Users\Azure> Add-Type -Namespace JuliaTest -Name Foo -MemberDefinition @'
>> public double Bar(double x)
>> {
>>     return 2 * x;
>> }
>> '@ -OutputAssembly Example.dll

For convenience, I generated the DLL by PowerShell, so the assembly name looks wierd (di0ato2a.2tx in this case, and I don't know how to change this...).

julia> using DotNET

julia> asm=T"System.Reflection.Assembly".LoadFrom("Example.dll")
System.Reflection.RuntimeAssembly("di0ato2a.2tx, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null")

The assembly is loaded with Assembly.LoadFrom method, just like what we do in C#.

Then we have two ways to reference our JuliaTest.Foo class:

julia> Foo=asm.GetType("JuliaTest.Foo")
JuliaTest.Foo

julia> T"JuliaTest.Foo, di0ato2a.2tx"
JuliaTest.Foo

Since Bar is not a static method, we need an instance of Foo:

julia> foo=Foo.new()
JuliaTest.Foo("JuliaTest.Foo")

julia> foo.Bar(3.14)
6.28

[robertdj]

Thanks a lot for your fast reply :-)