Class: Win32::API::Callback

Inherits:
Object
  • Object
show all
Defined in:
ext/win32/api.c

Defined Under Namespace

Classes: Error

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#Win32::API::Callback.new(prototype) ⇒ Object

Creates and returns a new Win32::API::Callback object. The function is the name of the Windows function.

The prototype is the function prototype for the callback function. This is a string. The possible valid characters are ‘I’ (integer), ‘L’ (long), ‘V’ (void), or ‘P’ (pointer). Unlike API objects, API::Callback objects do not have a default prototype.

The return argument is the return type for the callback function. The valid characters are the same as for the prototype. The default is ‘L’ (long).



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# File 'ext/win32/api.c', line 69

static VALUE callback_init(int argc, VALUE* argv, VALUE self)
{
   VALUE v_proto, v_return, v_proc;
    
   rb_scan_args(argc, argv, "11", &v_proto, &v_return);

   if(NIL_P(v_return) || RARRAY(v_return)->len == 0)
      v_return = rb_str_new2("L");

   if(rb_block_given_p())
      v_proc = rb_block_proc();
   else
      v_proc = Qnil;

    rb_iv_set(self, "@function", v_proc);
    rb_iv_set(self, "@prototype", v_proto);
    rb_iv_set(self, "@return_type", v_return);
    
    return self;
}

Instance Attribute Details

#prototype ⇒ Object (readonly)

The prototype, returned as an array of characters

#return_type ⇒ Object (readonly)

The return type, returned as a single character, P, L, I, V or B