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REBOL [ Title: "System Port - Drag Accept Demo" File: %sys-port-drag-accept.r Author: "Gregg Irwin" EMail: %greggirwin--acm--org Version: 0.0.1 Date: 25-sep-2003 Purpose: { Demo using system port to catch WM_DROPFILE messages for drag-n-drop support. } library: [ level: 'intermediate platform: 'windows type: [demo how-to] domain: [external-library win-api] tested-under: [view/pro on W2K] support: none license: none see-also: none ] ] ; Stripped version of win-shell object for demo purposes. win-shell: make object! [ win-lib: load/library %shell32.dll null-buff: func [ {Returns a null-filled string buffer of the specified length.} len [integer!] ][ head insert/dup make string! len #"^@" len ] drag-accept-files: make routine! [ hWnd [integer!] fAccept [integer!] return: [integer!] ] win-lib "DragAcceptFiles" drag-finish: make routine! [ hDrop [integer!] return: [integer!] ] win-lib "DragFinish" point: make struct! [ x [integer!] y [integer!] ] none drag-query-point: make routine! compose/deep [ {Returns nonzero if the drop occurred in the client area of the window, or zero if the drop did not occur in the client area of the window.} hDrop [integer!] lpPoint [struct! [(first point)]] return: [integer!] ] win-lib "DragQueryPoint" drag-query-file: make routine! [ hWnd [integer!] iFile [integer!] lpszFile[string!] cb [integer!] return: [integer!] ] win-lib "DragQueryFile" drag-query-filename-size: make routine! [ hWnd [integer!] iFile [integer!] lpszFile[integer!] cb [integer!] return: [integer!] ] win-lib "DragQueryFile" num-files-dropped?: func [hdrop [integer!]] [ drag-query-file hdrop -1 "" 0 ] ; When they give us a filename index, we'll subtract one for them, ; because Windows has the list as zero based, but I'd much rather let ; everything be one based on the REBOL side. dropped-filename-size?: func [ hdrop [integer!] index [integer!] ][ drag-query-filename-size hdrop index - 1 0 0 ] dropped-filename?: func [ hdrop [integer!] index [integer!] /local result len ][ result: null-buff add 1 dropped-filename-size? hdrop index len: drag-query-file hdrop index - 1 result length? result copy/part result len ] ] my-hwnd?: does [second get-modes system/ports/system [window]] WM_DESTROY: 2 ; &H2 WM_DROPFILES: 563 ; &H233 enable-system-trap: does [ ; Trap OS interrupts if not system/ports/system [ if none? attempt [system/ports/system: open [scheme: 'system]][ print "NOTE: Missing System Port" exit ] ] if find get-modes system/ports/system 'system-modes 'winmsg [ set-modes system/ports/system [winmsg: WM_DROPFILES] ] append system/ports/wait-list system/ports/system ] check-system-trap: func [port /local msg pt] [ if not port? port [return none] if any [port/scheme <> 'system port <> system/ports/system][return port] if not system/ports/system [return none] while [msg: pick system/ports/system 1] [ ;print ["msg:" mold msg] if msg/1 = 'winmsg [ if msg/2 = WM_DROPFILES [ print [ "You dropped " win-shell/num-files-dropped? msg/3 "files." ] pt: make struct! win-shell/point [0 0] win-shell/drag-query-point msg/3 pt print [" at coordinate " to pair! reduce [pt/x pt/y]] repeat i win-shell/num-files-dropped? msg/3 [ file: to-rebol-file win-shell/dropped-filename? msg/3 i print [ tab join i "." tab either dir? file [dirize file][file] ] ] print "Finishing drag operation" win-shell/drag-finish msg/3 print "Unregistering window from DragAcceptFiles queue" win-shell/drag-accept-files my-hwnd? to integer! false ; (do something with files here) halt ] ] ] none ] print "Drag some files and drop them on this window...^/" win-shell/drag-accept-files my-hwnd? to integer! true enable-system-trap forever [ wake-port: wait [] if wake-port [check-system-trap wake-port] ]
halt ;; to terminate script if DO'ne from webpage
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