[MacRuby-devel] Using an SQLite wrapper with macruby

[Matt Aimonetti]

I also documented the process there:

http://ofps.oreilly.com/titles/9781449380373/ch03.html#_using_objective_c_or_c_code

- Matt

Sent from my iPhone

On Jan 5, 2011, at 21:31, Laurent Sansonetti <lsansonetti at apple.com> wrote:

> 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
>> _______________________________________________
>> MacRuby-devel mailing list
>> MacRuby-devel at lists.macosforge.org
>> http://lists.macosforge.org/mailman/listinfo.cgi/macruby-devel
> 
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