CODEWITHSUNDEEP
lua
Ani
Ani

Reputation: 1526

Get error information if luaL_loadfile fails

If luaL_load function fails, then, according to the documentation (Lua5.1), the error message is pushed on the stack and can be retrieved with lua_tostring(L, -1), but if I want to print a customized error message, I don't think I can use lua_Debug (because that is for active function). Is there any other way (other than parsing the string) to get the file, line number and what error occured ?

-- Thanks.

Upvotes: 2

Views: 2279

Answers (2)

lhf
lhf

Reputation: 72312

The error code returned by luaL_loadfile tells you what kind of error happened. You're mostly likely only interested in LUA_ERRSYNTAX, in which case there is a detailed error message left on the stack. This is the only record of the error. If you need to reformat it, you need to parse it.

Upvotes: 3

Ian
Ian

Reputation: 442

During a luaL_load(), there is nothing techinally on the stack that is relavant to the loading of the script. No functions are performed or executed in the script. Its just a compilation step, returning a function that encapsulates the whole file or the error found during compilation.

If you get a function back, you execute this to actually run the script, which sounds like what you are really interested in. In which case you can use a lua_pcall() and provide an error handler. In your handler you would then have your expected stack trace available via lua_Debug.

Upvotes: 1

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