• Tofu Ninja (75/75) Aug 17 2018 Do shared libraries work? I am trying to load a D library into a
• Tofu Ninja (6/6) Aug 17 2018 Its this part that fails... always returns null
• Tofu Ninja (3/9) Aug 17 2018 I there any way to see why Runtime.loadLibrary is failing? It
• Igor (3/13) Aug 18 2018 Maybe you can find something useful in how Derelict does it here:
• Mike Wey (4/16) Aug 18 2018 You can probably use: core.sys.windows.winbase.GetLastError
• Tofu Ninja (5/19) Aug 18 2018 That was helpful, error is:
• Tofu Ninja (6/26) Aug 18 2018 Thank you this helped lead me to the real error.

Tofu Ninja <joeyemmons yahoo.com> writes:

Do shared libraries work? I am trying to load a D library into a 
D program but Runtime.loadLibrary just returns null for me and I 
am not sure what I am doing wrong.

import std.stdio;
import std.file : exists, getcwd, rename;
import core.thread;
import std.conv : to;
version(tofu_dynamic){
	import core.sys.windows.windows;
	import core.runtime;
	pragma(msg, "Dynamic Link Library");
	HINSTANCE g_hInst;

	export extern (Windows) BOOL DllMain(HINSTANCE hInstance, ULONG 
ulReason, LPVOID pvReserved) {
	    switch (ulReason) {
	        case DLL_PROCESS_ATTACH:
	            writeln("DLL_PROCESS_ATTACH");
	            Runtime.initialize();
	            break;

	        case DLL_PROCESS_DETACH:
	            writeln("DLL_PROCESS_DETACH");
	            Runtime.terminate();
	            break;

	        case DLL_THREAD_ATTACH:
	            writeln("DLL_THREAD_ATTACH");
	            return false;

	        case DLL_THREAD_DETACH:
	            writeln("DLL_THREAD_DETACH");
	            return false;

	        default:
	    }
	    g_hInst = hInstance;
	    return true;
	}

	pragma(mangle, "rti_start") export void rti_start(){
		writeln("rti start :)");
	}

} else {
	void main(string[] args) {
		uint id = 0;

		while(true) {
			if(exists("graph.dll")){
				auto name = "rti." ~ id.to!string ~ ".dll";
				rename("graph.dll", name);
				id++;
		      	     	loadLib(name);
			}
			Thread.sleep(dur!("seconds")(1));
		}
	}

	static void loadLib(string dllName) {
		import core.sys.windows.windows;
		import core.runtime;
		Thread.sleep(dur!("seconds")(1));
		writeln("Start Dynamic Link to ", dllName, "...");
		HMODULE h = cast(HMODULE) Runtime.loadLibrary(dllName);
	  	if (h is null) {
	  		writeln("error loading");
	  		return;
	   	}

	 	scope(exit){
			if (!Runtime.unloadLibrary(h))
	 			writeln("error freeing dll");
	   	}

		FARPROC fp = GetProcAddress(h, "rti_start");
		if (fp is null) {
			writeln("error loading symbol rti_start");
			return;
		}
		
		auto fun = cast(void function()) fp;
		fun();
		writeln("End...");
	}
}

Tofu Ninja <joeyemmons yahoo.com> writes:

Its this part that fails... always returns null

HMODULE h = cast(HMODULE) Runtime.loadLibrary(dllName);
if (h is null) {
	writeln("error loading");
	return;
}

Tofu Ninja <joeyemmons yahoo.com> writes:

On Friday, 17 August 2018 at 20:27:05 UTC, Tofu Ninja wrote:
 Its this part that fails... always returns null

 HMODULE h = cast(HMODULE) Runtime.loadLibrary(dllName);
 if (h is null) {
 	writeln("error loading");
 	return;
 }


I there any way to see why Runtime.loadLibrary is failing? It 
just returns null on error which is not very helpful.

Igor <stojkovic.igor gmail.com> writes:

On Saturday, 18 August 2018 at 00:31:49 UTC, Tofu Ninja wrote:
 On Friday, 17 August 2018 at 20:27:05 UTC, Tofu Ninja wrote:
 Its this part that fails... always returns null

 HMODULE h = cast(HMODULE) Runtime.loadLibrary(dllName);
 if (h is null) {
 	writeln("error loading");
 	return;
 }


 I there any way to see why Runtime.loadLibrary is failing? It 
 just returns null on error which is not very helpful.

Maybe you can find something useful in how Derelict does it here: 
https://github.com/DerelictOrg/DerelictUtil/blob/master/source/derelict/util/sharedlib.d

Mike Wey <mike-wey example.com> writes:

On 18-08-18 02:31, Tofu Ninja wrote:
 On Friday, 17 August 2018 at 20:27:05 UTC, Tofu Ninja wrote:
 Its this part that fails... always returns null

 HMODULE h = cast(HMODULE) Runtime.loadLibrary(dllName);
 if (h is null) {
     writeln("error loading");
     return;
 }

 
 
 I there any way to see why Runtime.loadLibrary is failing? It just 
 returns null on error which is not very helpful.

You can probably use: core.sys.windows.winbase.GetLastError

-- 
Mike Wey

Tofu Ninja <joeyemmons yahoo.com> writes:

On Saturday, 18 August 2018 at 11:27:29 UTC, Mike Wey wrote:
 On 18-08-18 02:31, Tofu Ninja wrote:
 On Friday, 17 August 2018 at 20:27:05 UTC, Tofu Ninja wrote:
 Its this part that fails... always returns null

 HMODULE h = cast(HMODULE) Runtime.loadLibrary(dllName);
 if (h is null) {
     writeln("error loading");
     return;
 }

 
 
 I there any way to see why Runtime.loadLibrary is failing? It 
 just returns null on error which is not very helpful.

 You can probably use: core.sys.windows.winbase.GetLastError

That was helpful, error is:

ERROR_DLL_INIT_FAILED

1114 (0x45A)

A dynamic link library (DLL) initialization routine failed.

Tofu Ninja <joeyemmons yahoo.com> writes:

On Saturday, 18 August 2018 at 21:10:55 UTC, Tofu Ninja wrote:
 On Saturday, 18 August 2018 at 11:27:29 UTC, Mike Wey wrote:
 On 18-08-18 02:31, Tofu Ninja wrote:
 On Friday, 17 August 2018 at 20:27:05 UTC, Tofu Ninja wrote:
 Its this part that fails... always returns null

 HMODULE h = cast(HMODULE) Runtime.loadLibrary(dllName);
 if (h is null) {
     writeln("error loading");
     return;
 }

 
 
 I there any way to see why Runtime.loadLibrary is failing? It 
 just returns null on error which is not very helpful.

 You can probably use: core.sys.windows.winbase.GetLastError

 That was helpful, error is:

 ERROR_DLL_INIT_FAILED

 1114 (0x45A)

 A dynamic link library (DLL) initialization routine failed.


Thank you this helped lead me to the real error.
The problem was here

writeln("DLL_PROCESS_ATTACH");
Runtime.initialize();

Cant use writeln before Runtime.initialize