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digitalmars.D.learn - DMD + Dynamic Library.

reply Damien Gibson <spiceywolf.archaicsoft outlook.com> writes:
Hi everyone. My first post here - I'm not one to usually resort 
to trying to ask forums directly for help but I'm a bit desperate 
at this point as I have wasted about 3 days in total of no-life 
googling trying to figure something out here.

My current setup works fine for creation of EXE's and Static 
libs. Dynamic libs are the only problem. I have some libraries I 
created and used just fine with static libs that I'd like to 
start using dynamically as managing them with multiple projects 
has just become too cumbersome.

My setup uses Mono-D using -shared and -H(-shared should already 
be called as it already generated .lib and .dll files but I added 
again just in case) and creating a new EXE project and trying to 
use the functions from the generated .di files works fine -> As 
long as the lib was generated static. While attempting to use 
dynamic generated .lib I always get the error "Library Reference 
Missing".

On each of my source files I've attempted adding export 
extern(D): right after Module declaration(Which again works just 
fine when using static edition of .lib) as well as I've used this 
for the dllmain (Which has only been modified slightly from the 
ones in guides)

version(Windows) {
	import core.sys.windows.windows : HINSTANCE;
	extern(Windows)	bool DllMain(HINSTANCE hInstance, uint ulReason, 
void* reserved) {
		import core.sys.windows.dll, core.sys.windows.windows;
		switch(ulReason) {
			default: assert(0);
			case DLL_PROCESS_ATTACH: return dll_process_attach( hInstance, 
true );
			case DLL_PROCESS_DETACH: dll_process_detach( hInstance, true 
);	return true;
			case DLL_THREAD_ATTACH:	return dll_thread_attach( true, true );
			case DLL_THREAD_DETACH:	return dll_thread_detach( true, true );
		}
	}
}


I've compiled EVERYTHING into x32 for windows and this being of 
course with the latest dmd2 compiler.

I'm all out of ideas here. From some of the threads I've come 
across researching the .def files that were in the main guides 
aren't needed as long as using the export extern(D): however 
whether or not they are actually needed or not -> Either the 
compiler or linker were throwing errors(I cant remember which).

I've even tried running .def made for example modules as well and 
it gave the same error so i know i wasn't just making it 
improperly.

I'm literally a couple tests from pulling my hair out so any 
wisdom on this issue would be greatly appreciated!
Mar 07 2017
parent reply Jerry <hurricane hereiam.com> writes:
You have to use "export" for any symbol to be visible from a dll. 
On Windows by default nothing is exported.
Mar 07 2017
parent reply Damien Gibson <spiceywolf.archaicsoft outlook.com> writes:
On Wednesday, 8 March 2017 at 06:28:47 UTC, Jerry wrote:

 You have to use "export" for any symbol to be visible from a 
 dll. On Windows by default nothing is exported.


Would "export" and "export extern(D):" not be the same? Im 
confuseled..
Mar 08 2017
next sibling parent reply evilrat <evilrat666 gmail.com> writes:
On Wednesday, 8 March 2017 at 18:21:35 UTC, Damien Gibson wrote:

 On Wednesday, 8 March 2017 at 06:28:47 UTC, Jerry wrote:

 You have to use "export" for any symbol to be visible from a 
 dll. On Windows by default nothing is exported.


 Would "export" and "export extern(D):" not be the same? Im 
 confuseled..


They are independent.

"export" simply tells compiler/linker to make symbol public(i.e. 
available for dynamic loading from lib), note that on *nix 
systems all symbols are public by default.

"extern" thing controls symbol name mangling and calling 
conventions(yes, it has no meaning for data)
Mar 08 2017
parent Damien Gibson <spiceywolf.archaicsoft outlook.com> writes:
Well i guess ill try turning it to export everywhere then in a 
bit and report back if it worked out.
Mar 08 2017
prev sibling parent reply Cassio Butrico <cassio_butrico hotmail.com> writes:
On Wednesday, 8 March 2017 at 18:21:35 UTC, Damien Gibson wrote:

 On Wednesday, 8 March 2017 at 06:28:47 UTC, Jerry wrote:

 You have to use "export" for any symbol to be visible from a 
 dll. On Windows by default nothing is exported.


 Would "export" and "export extern(D):" not be the same? Im 
 confuseled..


You have to use


	extern (C) {
	 import std.stdio;
	export{
	
	void dllprint() {
		writeln("\nmydll.dll read ok!!!\n");
	}

	int Myadd(int x, int y) {
		return x + y;
	}

}
}
Mar 10 2017
parent reply Damien Gibson <spiceywolf.archaicsoft outlook.com> writes:
Sorry for late reply, had rough irl stuff... Anyway I tried the 
suggestion for extern and for the export(C) extern but neither of 
those work. I dont have a working linux box to test against to 
ensure that it is a windows related problem but I appreciate the 
suggestions offered.
Mar 14 2017
parent reply Damien Gibson <spiceywolf.archaicsoft outlook.com> writes:
If it helps to know i also get in the other little window that 
tells me the activate compiler commands and stuff that the 
symbols for the functions i called undefined while the other side 
just said library reference not found.
Mar 15 2017
parent reply Cassio Butrico <cassio_butrico hotmail.com> writes:
On Wednesday, 15 March 2017 at 07:03:19 UTC, Damien Gibson wrote:

 If it helps to know i also get in the other little window that 
 tells me the activate compiler commands and stuff that the 
 symbols for the functions i called undefined while the other 
 side just said library reference not found.



I have an example of how to create a dll in d, read in c and d, 
if you want I can post the files, it's just an example to 
clarify, I use windows 10 32b and dmd 2.72 - yes my english is 
Too bad ... sorry. I speak Brazilian Portuguese.
Mar 15 2017
parent Damien Gibson <spiceywolf.archaicsoft outlook.com> writes:
 I have an example of how to create a dll in d, read in c and d, 
 if you want I can post the files, it's just an example to 
 clarify, I use windows 10 32b and dmd 2.72 - yes my english is 
 Too bad ... sorry. I speak Brazilian Portuguese.


I would love that :D And no dont worry your english was perfectly 
fine!
Mar 15 2017