Debug hooks not working properly

[TGMM]

I'm getting "System.AccessViolationException: Attempted to read or write protected memory" when trying to use the Debug library hooks.
I've tried with all the Lua versions and none of them seem to work, here's a snippet of code that will help reproduce the issue.

using LuaNET.Lua54;
using NativeMethods = LuaNET.Lua54.Lua;

var lua = NativeMethods.luaL_newstate();
NativeMethods.luaL_openlibs(lua);
NativeMethods.lua_sethook(lua, Hook, NativeMethods.LUA_MASKLINE, 0);
NativeMethods.luaL_dostring(lua, "print(10)\nprint(20)\nlocal x = 10");
return;

static void Hook(lua_State state, NativeMethods.lua_Debug func)
{
    Console.WriteLine("Test");
}

The function signature in lua.h does seem to match the bindings, so not sure what could be wrong here.

[tilkinsc]

It's very possible that I just human errored it due to the sheer number of functions. I'll investigate it later tonight. Feel free to submit a pr if you can't wait. Thanks for testing.

…

On Sun, Jun 1, 2025, 2:43 AM Eliud de León ***@***.***> wrote: *TGMM* created an issue (tilkinsc/Lua.NET#29) <#29> I'm getting "System.AccessViolationException: Attempted to read or write protected memory" when trying to use the Debug library hooks. I've tried with all the Lua versions and none of them seem to work, here's a snippet of code that will help reproduce the issue. using LuaNET.Lua54; using NativeMethods = LuaNET.Lua54.Lua; var lua = NativeMethods.luaL_newstate(); NativeMethods.luaL_openlibs(lua); NativeMethods.lua_sethook(lua, Hook, NativeMethods.LUA_MASKLINE, 0); NativeMethods.luaL_dostring(lua, "print(10)\nprint(20)\nlocal x = 10"); return; static void Hook(lua_State state, NativeMethods.lua_Debug func) { Console.WriteLine("Test"); } The function signature in lua.h does seem to match the bindings, so not sure what could be wrong here. — Reply to this email directly, view it on GitHub <#29>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABZFY5HFXZAT3KZLQM7T4UL3BKOHZAVCNFSM6AAAAAB6KXZPKKVHI2DSMVQWIX3LMV43ASLTON2WKOZTGEYDMNZTGQZDIMY> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[tilkinsc]

It fails because null of a struct (lua_KContext) is Nullable<lua_KContext>, so basically you have the nullable object instead of the struct.

[tilkinsc]

It is also cuz lua_Debug has strings and C# isn't marshalling the strings, just exploding

[tilkinsc]

Please pull the branch lua-debug-fix and play around with it. I just changed the strings to nints, so inconvenient, yes, but it works.