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Lua Errors C


pcall and xpcall In Lua programming, in order to avoid throwing these errors and handling errors, we need to use the functions pcall or xpcall. One Response to "Notes on Lua/C++ error handling" Scripting Language Shootout | CuppaDev says: January 22, 2014 at 11:52 pm […] gotcha with the C API to look out for is I will try the rest tomorrow. –Freakyy Aug 12 '13 at 0:56 1 I tested out the code and everything is working now. Why wasn't Peter Pettigrew bound with an Unbreakable Vow? check over here

And get rid of the debug.trace call in LuaErrorReport. If string "out of data" changes then my code will break they are harder to represent other, finer-grained errors Like error.overflow, app.error.protocol, etc Though one feature of error() which can help lua: test2.lua:3: b is not a number stack traceback: [C]: in function 'assert' test2.lua:3: in function 'add' test2.lua:6: in main chunk [C]: ? A simple example using pcall is shown below. https://www.lua.org/pil/24.3.html


Log in to join the conversation. Programming in Lua Part IV. Additional comments are welcome. ] Linking If you compile Lua in C, you must surround your #include in an extern "C", or use the #include equivalent, else you will Lua Reference 5.1 Manual: Background discussion: [2.7.

If you think about it, this means that most C++ programs that use longjmp would have undefined behaviour. Level 2 points the error to where the function that called error was called; and so on. That means that the possibility of a memory-allocation failure is pervasive in Lua. Lua Throw Exception Skip to content Ignore Learn more Please note that GitHub no longer supports old versions of Firefox.

Copyright © 2003–2004 Roberto Ierusalimschy. Lual_error A good example of this is the standard liolib.c which uses this strategy to avoid leaking file descriptors. -- RiciLake See Also LuaList:2005-08/msg00054.html - lua_error() and C++ LuaList:2006-10/msg00310.html - Lua error The following is the basic structure using all three of the functions. References https://gist.github.com/cwarden/1207556 http://www.lua.org/pil/8.4.html http://www.lua.org/wshop06/Belmonte.pdf Contact GitHub API Training Shop Blog About © 2016 GitHub, Inc.

Log In Return to Forum quote blizzardlogo netEaselogo Thanks for visiting the Blizzard Forums (2.11.0) · Patch Notes Support Feedback Americas - English (US) Region Americas Europe Asia China Language English Lua Pcall Example Error Handling (in Lua)], [3.6. What's causing these LUA errors? The level argument specifies how to get the error position.


If you want a call-stack with your Lua errors, then you need to generate one. http://stackoverflow.com/questions/18173054/c-lua-error-handling Is space piracy orbitally practical? Lua_error finally!) 29 commits 1 branch 0 releases Fetching contributors MIT Lua 98.2% Python 1.8% Lua Python Clone or download Clone with HTTPS Use Git or checkout with SVN using the web Lua_cpcall Why wasn't Peter Pettigrew bound with an Unbreakable Vow?

Your C++ code contains at least one local variable with a non-trivial destructor. check my blog Run Time Errors In case of runtime errors, the program executes successfully, but it can result in runtime errors due to mistakes in input or mishandled functions. lua_rawget, lua_rawgeti and lua_rawequal will also never throw an error. That means that almost all API functions may throw an error (that is, call longjmp) instead of returning. Lua Error Function


Forums Log In Shop Support Account Settings Games World of Warcraft® Diablo® III StarCraft® II Hearthstone® Heroes of the Storm™ Overwatch™ Forums IN DEVELOPMENT 7.1.5 PTR Bug Report 7.1.5 function myfunction () n = n/nil end function myerrorhandler( err ) print( "ERROR:", err ) end status = xpcall( myfunction, myerrorhandler ) print( status) When we run the above program, we Problem 1: C++ destructors may not called when doing a "longjmp" The scenario: Your C++ code calls a Lua API function. http://globalinfoindex.com/lua-error/lua-errors-gmod.php One "equal to" refers to assignment while a double "equal to" refers to comparison.

Another issue is if lua_cpcall returns a failure result, what do we do with it? Lua Error Wow Movie about a man who becomes a genius because of a brain tumor? First, none of the stack adjustment functions throw errors; this includes lua_pop, lua_gettop, lua_settop, lua_pushvalue, lua_insert, lua_replace and lua_remove.

Example code: int MyFunction(lua_State *lua) { std::vector v(10); // ...

UI and Macro PTR Discussion 7.0.3 PTR Bug Report 7.0.3 7.1 PTR Bug Report 7.1.5 PTR Bug Report 7.1 PTR Discussion Legion Beta Bug Report 7.1.5 PTR General Discussion Legion Beta Subjects to discuss while on break with older colleagues Why didn't Hans Gruber know what Mr. Pcall *p = static_cast(lua_touserdata(lua, 1)); // Get the global "EXAMPLE" and store it in the Pcall struct. Lua Xpcall Example For instance, a function like poke, which stores an arbitrary byte at an arbitrary memory address, can cause all sorts of memory corruption.

Thanks! Hot Network Questions What can I do about a rock climbing ban? lua_call(lua, 0, 0);  // call some lua function // ... have a peek at these guys std::string Example_Bad(lua_State *lua) { lua_getglobal(lua, "EXAMPLE");   // push value of EXAMPLE onto the stack const char *c = lua_tostring(lua, -1); // read stack top (as char *) std::string result = c

You signed in with another tab or window. Unlike C++ exception handling, the longjmp will skip any destructors of objects up the stack (often used for RAII in C++). What do I do if somebody asks me to join his accusation of my colleague of academic misconduct? Pomegranate Chicken James Potter and the Cloak of Invisibility - Why didn't he use it to hide the family from Voldemort?

While still largely relevant for later versions, there are some differences.The fourth edition targets Lua 5.3 and is available at Amazon and other bookstores.By buying the book, you also help to During this process I found out that there are several "gotchas" in terms of how to correctly handle Lua errors in your C++ code. Advisor drops MSci student suddenly in final semester more hot questions question feed lang-lua about us tour help blog chat data legal privacy policy work here advertising info mobile contact us Was Harry's concern about Fleur's sister Gabrielle misplaced?

Can someone take my Wi-Fi signal DOWN? Reload to refresh your session. Permalink Failed to load latest commit information. Join them; it only takes a minute: Sign up C++ Lua Error Handling up vote 4 down vote favorite I am working on a program (C++, with D3D9) and Lua.

Problem 3: Avoiding Lua "panics" The scenario: C++ calls a Lua API function, and the Lua API function raises a Lua error. When you write library functions for Lua, however, there is a standard way to handle errors. But this one is not. I dont think that causes the error.

What does Knights do? I will present this as a series of problems that can occur, and possible solutions to each. Whenever you add new C functions to Lua, you can break that safety.