From: Nobuyoshi Nakada <nobu@...>
Date: 2010-07-04T10:02:28+09:00
Subject: [ruby-core:31033] Re: Ruby/DL problem

Hi,

At Sat, 3 Jul 2010 00:37:00 +0900,
Aston wrote in [ruby-core:30996]:
> module Win32
> extend DL::Importer
  dlload "kernel32"	# is this correct DLL?
> extern "int SetEnvironmentVariableA( char* lpName, char* lpValue)"
> extern "int GetEnvironmentVariableA( char* lpName, char* lpValue, int size)"
> end

The following patch refines the error messages.


diff --git a/ext/dl/lib/dl/import.rb b/ext/dl/lib/dl/import.rb
index fd23bc9..f9e8faf 100644
--- a/ext/dl/lib/dl/import.rb
+++ b/ext/dl/lib/dl/import.rb
@@ -194,8 +194,12 @@ module DL
       return ptr
     end
 
+    def handler
+      @handler or raise "call dlload before importing symbols and functions"
+    end
+
     def import_symbol(name)
-      addr = @handler.sym(name)
+      addr = handler.sym(name)
       if( !addr )
         raise(DLError, "cannot find the symbol: #{name}")
       end
@@ -203,7 +207,7 @@ module DL
     end
 
     def import_function(name, ctype, argtype, call_type = nil)
-      addr = @handler.sym(name)
+      addr = handler.sym(name)
       if( !addr )
         raise(DLError, "cannot find the function: #{name}()")
       end


-- 
Nobu Nakada