Question

我想根据下面的示例A添加一个列表框。 The Common Lisp Cookbook - Using the Win32 API

我添加了一个函数sendmessage，它映射到它的windows API计数器部分并从wndproc调用它。但它抱怨下面的类型转换错误。

CL-USER 1 > (create-toplevel-window "ppp")

Error: #<Pointer to type (:UNSIGNED :SHORT) = #x01E902D8> cannot be
converted to foreign type (:UNSIGNED-INTEGER-TYPE 32).

以下是与错误相关的功能。有什么想法解决这个问题吗？我尝试将 lparam 的sendmessage定义为（：unsigned：short），但没有用。

(fli:define-foreign-function
    (SendMessage "SendMessage" :dbcs)
 ((hwnd hwnd) (msg uint) (wparam ulong) (lparam (:unsigned :long)))
    :result-type ulong :calling-convention :stdcall)


(fli:define-foreign-callable 
    (wndproc :result-type :long :calling-convention :stdcall)
    ((hwnd hwnd) (msg (:unsigned :long)) 
     (wparam (:unsigned :long)) (lparam (:unsigned :long)))
  (case msg
   (#.WM_CREATE
    (fli:with-foreign-string ;; class name pointer
      (cn-p ec bc :external-format (external-format)) "LISTBOX"
     (fli:with-foreign-string ;; window name pointer
      (wn-p ec bc :external-format (external-format)) ""
      (let ((lstbx (createwindowex hwnd cn-p wn-p 
                         (logior ws_visible ws_child lbs_notify)
                cw_usedefault cw_usedefault cw_usedefault cw_usedefault
                0 0 200 100)))
    (fli:with-foreign-string (msg ec bc :external-format (external-format)) "item1"
                 (sendmessage lstbx LB_ADDSTRING 0 msg ))))))
              ;;0 0 (GetModuleHandle-current 0) 0))))

    ;;(createwindowex "listbox4test" hwnd))
   ;;(#.WM_PAINT (wndproc-paint hwnd msg wparam lparam))
   #+console (#.WM_DESTROY (PostQuitMessage 0) 0)
   (t (DefWindowProc hwnd msg wparam lparam))))

Answer 1

我更改了sendmessage功能，如下所示。而这一次，它没有抱怨。

(fli:define-foreign-function
    (SendMessage "SendMessage" :dbcs)
 ((hwnd hwnd) (msg uint) (wparam ulong) (lparam :pointer)) ;;;(lparam (:unsigned :long)))
    :result-type ulong :calling-convention :stdcall)

lispworks fli：无法转换为外来类型

1 个答案: