D-DLLs & Python

[John Colvin]

On Wednesday, 20 February 2013 at 14:28:06 UTC, Chris wrote:
> On Wednesday, 20 February 2013 at 14:05:40 UTC, Mike Parker 
> wrote:
>> Your function is being called from Python, correct? Then in 
>> addition to the extern(C), the argument needs to be a char*, 
>> not a D array or a reference to one.
>
> Correct, and it works _now_*! The lines
>
> printf("Incoming printf: %s\n", str);
> writefln("writefln %s", to!string(str));
>
> Print now:
>
> Incoming printf: Hello from Python
> writefln Hello from Python
>
>
> So the correct signature is
>
> extern (C) {export void printThis(char* str);}
>
> Thanks you guys! I'm so glad I don't have to write a C-wrapper!
>
> *("_now_" because I tried char* with extern (C) before as I 
> would in my other Python modules, but it didn't work for some 
> reason. Must have overlooked something. Mea culpa!).

yeah, although extern(C) doesn't have to have any braces.

I've never had to use export before, but then that could be a 
.so/.dylib vs .dll thing