我正在嘗試編寫RSPEC(ruby flavored BDD)和Windows應用程序之間的接口。應用程序本身是用一種晦澀的語言編寫的,但它有一個C API來提供訪問。我已經使用了Ruby/DL,但即使是最基本的調用DLL方法的工作也有困難。這裏是我到目前爲止,在一個名爲gt4r.rb:你如何使用Ruby/DL?這是正確的嗎?
require 'dl/import'
module Gt4r
extend DL::Importable
dlload 'c:\\gtdev\\r321\\bin\\gtvapi'
# GTD initialization/termination functions
extern 'int GTD_init(char *[], char *, char *)'
extern 'int GTD_initialize(char *, char *, char *)'
extern 'int GTD_done(void)'
extern 'int GTD_get_error_message(int, char **)'
end
我讀到目前爲止表明,這是所有我需要去,所以我寫了一個RSPEC例如:
require 'gt4r'
@@test_environment = "INCLUDE=C:\\graphtalk\\env\\aiadev\\config\\aiadev.ini"
@@normal_user = "BMCHARGUE"
describe Gt4r do
it 'initializes' do
rv = Gt4r.gTD_initialize @@normal_user, @@normal_user, @@test_environment
rv.should == 0
end
end
和運行時...
C:\code\GraphTalk>spec -fs -rgt4r gt4r_spec.rb
Gt4r
- initializes (FAILED - 1)
1)
'Gt4r initializes' FAILED
expected: 0,
got: 13 (using ==)
./gt4r_spec.rb:9:
Finished in 0.031 seconds
1 example, 1 failure
的返回值(13)是一個實際的返回代碼,這意味着一個錯誤,但是當我嘗試添加gTD_get_error_message打到我RSPEC,我不能讓參數工作。
我正朝着正確的方向前進,任何人都可以指向我可以嘗試的下一件事情嗎?
感謝, 佈雷特
一個跟進這個問題,顯示出當我嘗試從我的目標庫收到錯誤消息失敗的部分:
require 'gt4r'
@@test_environment = "INCLUDE=C:\\graphtalk\\env\\aiadev\\config\\aiadev.ini"
@@normal_user = "BMCHARGUE"
describe Gt4r do
it 'initializes' do
rv = Gt4r.gTD_initialize @@normal_user, @@normal_user, @@test_environment
Gt4r.gTD_get_error_message rv, @msg
@msg.should == ""
rv.should == 0
end
end
我期待在@msg要返回的錯誤信息,但在運行時我得到以下幾點:
Gt4r
(eval):5: [BUG] Segmentation fault
ruby 1.8.6 (2008-08-11) [i386-mswin32]
This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information.
這如果我使用一個符號(:味精),而不是:
C:\code\GraphTalk\gt4r_dl>spec -fs -rgt4r gt4r_spec.rb
Gt4r
- initializes (ERROR - 1)
1)
NoMethodError in 'Gt4r initializes'
undefined method `to_ptr' for :msg:Symbol
(eval):5:in `call'
(eval):5:in `gTD_get_error_message'
./gt4r_spec.rb:9:
Finished in 0.046 seconds
1 example, 1 failure
顯然我錯過了一些關於Ruby和C,但什麼之間傳遞參數?
我到目前爲止閱讀的FFI聽起來很有趣。我試試看... – Brett 2008-11-07 14:16:49
hmmm ...不適用於windows – Brett 2008-11-07 15:10:01