CODEWITHSUNDEEP
lispcommon-lispffilispworks
user1461328
user1461328

Reputation: 742

lispworks fli: cannot be converted to foreign type

I wanted to add a listbox based on the sample A here below. The Common Lisp Cookbook - Using the Win32 API

I added a function, sendmessage which maps to its windows API counter part and call it from the wndproc. But it complained type conversion error like below.

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

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

Here are the functions related to the error. Any idea to fix the issue? I tried to define sendmessage with lparam as (:unsigned :short) but no use.

(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))))

Upvotes: 1

Views: 82

Answers (1)

user1461328
user1461328

Reputation: 742

I changed the sendmessage function as below. And this time, it did not complain.

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

Upvotes: 0

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