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digitalmars.D - DLL in D based on Tango

reply BLS <nanali nospam-wanadoo.fr> writes:
Hello,
My question is :
Can I create a DLL written in *D* having a simple C Interface  *A* 
scripting language can use ?
Probabely yes.
  Using TANGO ? I do not know.

An example will help ;-)

Okay this question is TANGO independent :
My Scripting language is passing strings as zero terminated C strings 
and I have to manipulate them (in my D DLL) before passing these strings 
to another C stdcall DLL - using --- char* . Any hints ?
Many thanks in advance.

Bjoern
BTW I am talking about the ASPELL Interface
Jul 05 2007
parent reply Sean Kelly <sean f4.ca> writes:
BLS wrote:

 Hello,
 My question is :
 Can I create a DLL written in *D* having a simple C Interface  *A* 
 scripting language can use ?
 Probabely yes.
  Using TANGO ? I do not know.



Tango has two routines for initializing and terminating the runtime:

extern (C) bool  rt_init( void delegate( Exception ) dg = null );
extern (C) bool  rt_term( void delegate( Exception ) dg = null );

Call these in DllMain or wherever appropriate.  The delegate will be 
passed any exceptions thrown while the functions are processing, and 
will return true/false on success/failure.

As for the rest, building a DLL in Tango should be the same as doing so 
with Phobos.


Sean
Jul 09 2007
parent reply BLS <nanali nospam-wanadoo.fr> writes:
Sean Kelly schrieb:

 BLS wrote:

 Hello,
 My question is :
 Can I create a DLL written in *D* having a simple C Interface  *A* 
 scripting language can use ?
 Probabely yes.
  Using TANGO ? I do not know.



 Tango has two routines for initializing and terminating the runtime:
 
 extern (C) bool  rt_init( void delegate( Exception ) dg = null );
 extern (C) bool  rt_term( void delegate( Exception ) dg = null );
 
 Call these in DllMain or wherever appropriate.  The delegate will be 
 passed any exceptions thrown while the functions are processing, and 
 will return true/false on success/failure.
 
 As for the rest, building a DLL in Tango should be the same as doing so 
 with Phobos.
 
 
 Sean



Thank you Sean !
Sean :

 Tango has two routines for initializing and terminating the runtime:

 extern (C) bool  rt_init( void delegate( Exception ) dg = null );
 Call these in DllMain or wherever appropriate.



leaves a lot of room for improvements, f.i.:

BOOL DllMain(HINSTANCE hInstance, ULONG ulReason, LPVOID pvReserved)
{
     switch (ulReason)
     {
	case DLL_PROCESS_ATTACH:
	    gc_init();			// initialize GC
............
	case DLL_PROCESS_DETACH:
............
Pretty sure it will make you shake your head - But I have to ask: Shall 
I simply replace gc_init() with rt_init().

I am sorry about beeing so uninformed:ignorant but I never really 
understand the GC/Runtime Tango/Phobos problem.

So Sean;  I remain with a Thank You and hope you will be patient enough 
to offer a minimalistic sample ?
(probabely on DSource/Tango. may be more people are interested)

Bjoern
Jul 09 2007
parent reply Sean Kelly <sean f4.ca> writes:
BLS wrote:

 Sean Kelly schrieb:

 BLS wrote:

 Hello,
 My question is :
 Can I create a DLL written in *D* having a simple C Interface  *A* 
 scripting language can use ?
 Probabely yes.
  Using TANGO ? I do not know.



 Tango has two routines for initializing and terminating the runtime:

 extern (C) bool  rt_init( void delegate( Exception ) dg = null );
 extern (C) bool  rt_term( void delegate( Exception ) dg = null );

 Call these in DllMain or wherever appropriate.  The delegate will be 
 passed any exceptions thrown while the functions are processing, and 
 will return true/false on success/failure.

 As for the rest, building a DLL in Tango should be the same as doing 
 so with Phobos.


 Sean



 Thank you Sean !
 Sean :
  > Tango has two routines for initializing and terminating the runtime:
  >
  > extern (C) bool  rt_init( void delegate( Exception ) dg = null );
  > Call these in DllMain or wherever appropriate.
 
 leaves a lot of room for improvements, f.i.:
 
 BOOL DllMain(HINSTANCE hInstance, ULONG ulReason, LPVOID pvReserved)
 {
     switch (ulReason)
     {
     case DLL_PROCESS_ATTACH:
         gc_init();            // initialize GC
 ............
     case DLL_PROCESS_DETACH:
 ............
 Pretty sure it will make you shake your head - But I have to ask: Shall 
 I simply replace gc_init() with rt_init().



The D runtime includes a bunch of stuff, including the GC.  When you run 
a D app, the runtime is initialized before main() starts, and one of the 
things that happens is gc_init() is called.  Assuming you want 
DLL_PROCESS_ATTACH to be equivalent to 'starting' your DLL, then just 
replace gc_init() with rt_init().  rt_init() will call gc_init() as a 
part of its processing.


 I am sorry about beeing so uninformed:ignorant but I never really 
 understand the GC/Runtime Tango/Phobos problem.



No problem.  It's kind of tricky if you haven't spent time with that 
portion of the code.  That's one reason I decided to talk about the 
runtime at the D conference.


Sean
Jul 09 2007
parent BLS <nanali nixspam-wanadoo.fr> writes:
Sean Kelly Wrote:


 .... That's one reason I decided to talk about the 
 runtime at the D conference.



Take care about the voice recording; One of the often underestimated things.  
What remains ? Saying Thank You...Picking on your nerves again at DSource
regarding the DLL stuff. <friendly grin>
Bjoern  

 
Bjoern
Jul 09 2007