[MacRuby-devel] Using an SQLite wrapper with macruby

[Laurent Sansonetti]

Hi Ruben,

MacRuby cannot call vararg functions without proper BridgeSupport metadata, because there is no way it can determine at runtime if a function is variadic or not (because the call site must be compiled differently).

You may need to generate a BridgeSupport file for the wrapper you use. See the gen_bridge_metadata(1) man page for more info.

If the wrapper is a framework, you just copy the file in the Resources/BridgeSupport directory (as documented in the man page), then calling #framework from MacRuby will automatically parse it for you.

If the wrapper is a library that you link statically with your app, you will have to ship the BridgeSupport file in your app bundle, then use the #load_bridge_support_file method from the MacRuby side to load it up.

Laurent

On Jan 5, 2011, at 10:29 AM, Ruben Fonseca wrote:

> Hi all.
> 
> I'm trying to build a MacRuby 0.8 app with XCode. I want to interact with
> an exisitng Sqlite3 database. Since I don't want to package or mess with
> any Rubygem, I decided to look into existing Objective-C Sqlite wrappers.
> 
> I've tried PLDatabase and fmdb, and failed with both. The code compiles and
> the application runs, but when calling a C function what accepts a va_arg
> argument list, my app receives a EXC_BAD_INSTRUCTION.
> 
> Example:
> 
> Objective-C function interface:
> 
> - (FMResultSet *)executeQuery:(NSString*)sql, ... {
> 
> Ruby code
> 
> db.executeQuery "SELECT * FROM call"
> 
> it receives the error on this C line inside the executeQuery function
> 
> va_start(args, sql);
> 
> 
> Any hints? Do you recommend a simple way of interacting with a Sqlite3
> app with macruby + xcode, without using any gems?
> 
> Thank you
> Ruben
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> MacRuby-devel at lists.macosforge.org
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