What	ffidl
Where	http://elf.org/ffidl/
Where	http://rutherglen.ics.mq.edu.au/~steffen/tcltk/ffidl/doc (dead)
version	0.6
Updated	??/2006
Contact	mailto:[email protected] (Roger E. Critchlow Jr.)

See Also  edit

Ffix - Ffidl eXtented

an experimental wrapper to make foreign function calling easier

Description  edit

Development  edit

git repository

Released 0.7 version with Tcl 8.6 support (incorporates PYK changes below, compatibility with recent libffi and some cleanups). Check out the renewed documentation. APN Nice to see a new release. From the docs though it is not clear if the new version has support for 64-bit Windows (the original version did not). This is due to the fact, that size of data type long is 4 bytes even on 64-bit Windows and therefore unsuitable to store and retrieve function pointers.

unofficial fossil repository

no releases yet, but some minor fixes have been made. Unlike 0.6, below, it builds with Tcl-8.6.

• Tcl/Tk version 8.6.4.1 installation's header and library files
• libffi library version 3.1.
  Note: Binary built using library version 3.2.1 did not pass test suite.
• MinGW-w64 for 32 and 64 bit Windows compilers version 7.2.0.
  Note: Use -mlong-double-64 compiler option as Microsoft's data type long double is 8 bytes and equal to data type double.

@@ -540,0 +541 @@ EXTERN int        Ffidl_Init _ANSI_ARGS_((Tcl_I
+#endif
@@ -553 +553,0 @@ EXTERN int        Ffidl_Init _ANSI_ARGS_((Tcl_I
-#endif
@@ -1228 +1228 @@ static int cif_protocol(Tcl_Interp *inte
-#ifdef __WIN32__
+#if defined(__WIN32__) && ! defined(__WIN64__)
@@ -1546 +1546 @@ static void callback_callback(ffi_cif *f
-  long ltmp;
+  Tcl_WideIntOrLong ltmp;
@@ -1616 +1616 @@ static void callback_callback(ffi_cif *f
-      Tcl_ListObjAppendElement(interp, list, Tcl_NewLongObj((long)(*(void **)argp)));
+      Tcl_ListObjAppendElement(interp, list, Tcl_NewWideIntOrLong((Tcl_WideIntOrLong)(*(void **)argp)));
@@ -1652 +1652 @@ static void callback_callback(ffi_cif *f
-      ltmp = (long)dtmp;
+      ltmp = (Tcl_WideIntOrLong)dtmp;
@@ -1654 +1654 @@ static void callback_callback(ffi_cif *f
-        if (Tcl_GetLongFromObj(interp, obj, &ltmp) == TCL_ERROR) {
+        if (Tcl_GetWideIntOrLongFromObj(interp, obj, &ltmp) == TCL_ERROR) {
@@ -1658 +1658 @@ static void callback_callback(ffi_cif *f
-    } else if (Tcl_GetLongFromObj(interp, obj, &ltmp) == TCL_ERROR) {
+    } else if (Tcl_GetWideIntOrLongFromObj(interp, obj, &ltmp) == TCL_ERROR) {
@@ -1682 +1682 @@ static void callback_callback(ffi_cif *f
-      if (Tcl_GetLongFromObj(interp, obj, &ltmp) == TCL_ERROR) {
+      if (Tcl_GetWideIntOrLongFromObj(interp, obj, &ltmp) == TCL_ERROR) {
@@ -2257 +2257 @@ static int tcl_ffidl_info(ClientData cli
-    Tcl_SetObjResult(interp, Tcl_NewLongObj((long)interp));
+    Tcl_SetObjResult(interp, Tcl_NewWideIntOrLong((Tcl_WideIntOrLong)interp));
@@ -2400 +2400 @@ static int tcl_ffidl_call(ClientData cli
-  long ltmp;
+  Tcl_WideIntOrLong ltmp;
@@ -2421 +2421 @@ static int tcl_ffidl_call(ClientData cli
-        ltmp = (long)dtmp;
+        ltmp = (Tcl_WideIntOrLong)dtmp;
@@ -2423 +2423 @@ static int tcl_ffidl_call(ClientData cli
-          if (Tcl_GetLongFromObj(interp, obj, &ltmp) == TCL_ERROR)
+            if (Tcl_GetWideIntOrLongFromObj(interp, obj, &ltmp) == TCL_ERROR)
@@ -2425 +2425 @@ static int tcl_ffidl_call(ClientData cli
-      } else if (Tcl_GetLongFromObj(interp, obj, &ltmp) == TCL_ERROR)
+      } else if (Tcl_GetWideIntOrLongFromObj(interp, obj, &ltmp) == TCL_ERROR)
@@ -2441 +2441 @@ static int tcl_ffidl_call(ClientData cli
-        if (Tcl_GetLongFromObj(interp, obj, &ltmp) == TCL_ERROR)
+        if (Tcl_GetWideIntOrLongFromObj(interp, obj, &ltmp) == TCL_ERROR)
@@ -2624 +2624 @@ static int tcl_ffidl_call(ClientData cli
-  case FFIDL_PTR:        Tcl_SetObjResult(interp, Tcl_NewLongObj((long)cif->rvalue.v_pointer)); break;
+  case FFIDL_PTR:        Tcl_SetObjResult(interp, Tcl_NewWideIntOrLong((Tcl_WideIntOrLong)cif->rvalue.v_pointer)); break;
@@ -2647 +2647 @@ static int tcl_ffidl_callout(ClientData
-  long tmp;
+  Tcl_WideIntOrLong tmp;
@@ -2675 +2675 @@ static int tcl_ffidl_callout(ClientData
-  if (Tcl_GetLongFromObj(interp, objv[4], &tmp) == TCL_ERROR) return TCL_ERROR;
+  if (Tcl_GetWideIntOrLongFromObj(interp, objv[4], (Tcl_WideIntOrLong*)&tmp) == TCL_ERROR) return TCL_ERROR;
@@ -2867 +2867 @@ static int tcl_ffidl_symbol(ClientData c
-  Tcl_SetObjResult(interp, Tcl_NewLongObj((long)address));
+  Tcl_SetObjResult(interp, Tcl_NewWideIntOrLong((Tcl_WideIntOrLong)address));
@@ -2938 +2938 @@ static int tcl_ffidl_stubsymbol(ClientDa
-  Tcl_SetObjResult(interp, Tcl_NewLongObj((long)address));
+  Tcl_SetObjResult(interp, Tcl_NewWideIntOrLong((Tcl_WideIntOrLong)address));

Obtaining  edit

• updates for 2005 versions of libffi & ffcall
• TEA 3.2 buildsystem, testsuite
• support for Tcl 8.4, TclpDlopen, Tcl_WideInt
• fixes for 64bit LP64
• callouts & callbacks are created/used relative to current namespace (for unqualified names)
• addition of [ffidl::stubsymbol] for Tcl/Tk symbol resolution via stubs tables
• callbacks can be called anytime, not just from inside call-outs (using Tcl_BackgroundError to report errors)

updated docs

source tarball

full source tarball

includes libffi and ffcall sources

• source code
• MacOS Universal Binary (tested on Leopard)

http://elf.org/ffidl/

Sourceforge

ffcall 1.10

HEAD of libffi from the gcc CVS

small patch

The diff

installer package or tarball

available

sourceforge compilefarm

• amd64-linux1
• alpha-linux1
• x86-linux1
• x86-linux2
• x86-solaris1
• x86-freebsd1
• x86-netbsd1

• sparc-solaris1

• x86-openbsd1
• ppc-osx1
• ppc-osx2

Code Using Ffidl  edit

always on top

wrapper code for AutoIt

web2desktop

ZLM: includes an example of using ffidl to set the Windows desktop background.

Custom Toplevel Frame

SeS (26-10-2010): uses Ffidl to access DLL's and create customized toplevel frames in the Windows OS

Collation

bll 2016-5-20: Uses Ffidl to call setlocale() and wcscoll() to provide a collated sort.

Example: The Tcl Library  edit

#! /bin/env tclsh

package require Ffidl
namespace eval ::ffidl {
        namespace export *
        namespace ensemble create
}

if {[namespace current] ne {::}} {
        namespace import ::ffidl
}
set tclso libtcl8.6.so
#set tclso libtcl8.5.so
#set tclso [ffidl::find-lib tcl8.6]

set Tcl_CreateInterp_sym [ffidl symbol $tclso Tcl_CreateInterp]
set Tcl_GetCwd_sym [ffidl symbol $tclso Tcl_GetCwd]
set Tcl_InterpDeleted_sym [ffidl symbol $tclso Tcl_InterpDeleted]
set Tcl_GetString_sym [ffidl symbol $tclso Tcl_GetString]
set Tcl_EvalObjEx_sym [ffidl symbol $tclso Tcl_EvalObjEx]

ffidl callout Tcl_CreateInterp {} pointer $Tcl_CreateInterp_sym
ffidl callout Tcl_GetCwd {pointer pointer-var} pointer-utf8 $Tcl_GetCwd_sym
ffidl callout Tcl_InterpDeleted pointer int $Tcl_InterpDeleted_sym
ffidl callout Tcl_GetString pointer-obj pointer-utf8 $Tcl_GetString_sym
ffidl callout TclEvalObjEx {pointer pointer-obj int} int $Tcl_EvalObjEx_sym

set interp [Tcl_CreateInterp]
set script {puts [pwd]}
puts [Tcl_GetString $script]
TclEvalObjEx $interp $script 0
set bufferPtr [binary format [ffidl info format pointer] 0]

set pwd [Tcl_GetCwd $interp bufferPtr] 
puts $pwd

Examples  edit

Getting Windows "special folders" with Ffidl

kostix offers a solution for getting "special folders" on Windows platforms. While TWAPI can do this out-of-the-box, it doesn't work on Win9x and is big. Ffidl doesn't have these limitations.

calling Fortran routines in a DLL

AutoIt

ffidl wrapper brought to you by [Michael Jacobsen]

Windows Desktop modifications with Ffidl

playing around with Windows desktop properties.

int foo_init( int adr, int log );
int foo_done( void );
int foo_info( FOO_INFO *infoPtr ); /* FOO_INFO is a structure */
int foo_open( const char *port );

load ffidl05.dll
set DLL foo.dll
ffidl::callout foo_init {int int} int  [ffidl::symbol $DLL foo_init]
ffidl::callout foo_done {} int   [ffidl::symbol $DLL foo_done]
ffidl::callout foo_info {pointer-var} int [ffidl::symbol $DLL foo_info]
ffidl::callout foo_open {pointer-utf8} int [ffidl::symbol $DLL foo_open]

example

#Rolf Schroedter
#German Aerospace Center
#Institute of Space Sensor Technology and Planetary Exploration
 
load ffidl05.dll
 
ffidl::callout dll_FindWindow       {pointer-utf8 pointer-utf8} int     [ffidl::symbol user32.dll FindWindowA]
ffidl::callout dll_FindWindowTitle  {int pointer-utf8} int              [ffidl::symbol user32.dll FindWindowA]
ffidl::callout dll_FindWindowClass  {pointer-utf8 int} int              [ffidl::symbol user32.dll FindWindowA]
ffidl::callout dll_SetWindowPos     {int int int int int int int} int   [ffidl::symbol user32.dll SetWindowPos]
ffidl::callout dll_SystemParametersInfo {int int pointer int} int       [ffidl::symbol user32.dll SystemParametersInfoA]

proc FindWindow { class title } {
    if { [string length $class] == 0 } {
        dll_FindWindowTitle 0 $title
    } elseif { [string length $title] == 0 } {
        dll_FindWindowClass $class 0
    } else {
        dll_FindWindow $class $title
    }
}
proc SetWindowPos { hwnd after x y cx cy {flags 0} } {
    array set VAL {TOP 0 BOTTOM 1 TOPMOST -1 NOTOPMOST -2}
    set iAfter $VAL([string toupper $after])
    dll_SetWindowPos $hwnd $iAfter $x $y $cx $cy $flags
}
proc SetupScreenSaver { bool } {
    dll_SystemParametersInfo 97 $bool 0 0   ;# SPI_SCREENSAVERRUNNING=97
}
proc exit? {} {
    set answer [tk_messageBox -message "Really quit?" -type yesno -icon question]
    switch -- $answer {
        yes {
            SetupScreenSaver 0
            exit
        }
        no {}
    }
}
proc ScreenSaver {win} {
    set size(X) [winfo screenwidth .]
    set size(Y) [winfo screenheight .]

    toplevel $win
    wm title $win "TclScreenSaver"     ;# to find the window

    wm overrideredirect $win true
    $win configure -relief flat -bd 0
    $win configure -cursor hand2    ;# Ohne cursor ???

    update idletasks                ;# virtually display $win, allows window to be found
    set hwnd [FindWindow "" "TclScreenSaver"]
    set res1 [SetWindowPos $hwnd TOPMOST 0 0 $size(X) $size(Y)]   ;# ever makes full screen
    set res2 [SetupScreenSaver 1]

    canvas $win.c -background yellow -width $size(X) -height $size(Y) -relief flat -bd 0
    pack $win.c -expand yes -fill both

    focus -force $win

    bind $win <Key> exit?
    bind $win <Motion> {}
}

wm withdraw .
ScreenSaver .scr

load lib/ffidl05.dll
ffidl::callout dll_SetFocus {int} int [ffidl::symbol user32.dll SetFocus]
proc GrabFocus {args} {dll_SetFocus [winfo id .]}

bind . <Button> +GrabFocus

Example: Using Pointers  edit

typedef short           I16;
typedef unsigned short  U16;


I16 _7443_initial(I16 *existCards);
I16 _7443_close(void);
I16 _7443_version_info(I16 CardNo, U16 *HardwareInfo, U16 *SoftwareInfo, U16 *DriverInfo);
I16 _7443_d_output(I16 CardNo, I16 Ch_No, I16 value);

namespace eval 7443 {
    variable dll_name PPCI7443.dll
  
    ffidl::callout _initial {pointer-var} sint16 \
        [ffidl::symbol $dll_name _7443_initial]

    ffidl::callout close {} void [ffidl::symbol $dll_name _7443_close]
  
    ffidl::callout _version_info {sint16 pointer-var pointer-var pointer-var} \
        sint16 [ffidl::symbol $dll_name _7443_version_info]

    ffidl::callout d_output {sint16 sint16 sint16} sint16 \
          [ffidl::symbol $dll_name _7443_d_output]

}
  
# varName should containt quantity of available cards
proc 7443::initial {varName} {
    upvar $varName existsCards
    set cards [binary format s 0]
    set result [_initial cards]
    binary scan $cards s existsCards
    return $result
}

# return: {errorCode hardwareInfo softwareInfo driverInfo}
proc 7443::version_info {cardNumber} {
    set hardwareInfo [binary format s 0]
    set softwareInfo [binary format s 0]
    set driverInfo   [binary format s 0]
  
    set result [_version_info $cardNumber hardwareInfo softwareInfo driverInfo]

    binary scan $hardwareInfo s hi
    binary scan $softwareInfo s si
    binary scan $driverInfo   s di
  
    return [list $result $hi $si $di]
}

Example: Accessing Carbon API's on Mac OS X  edit

#!/bin/sh
#
# Let's ffidl with Carbon HotKeys!
#
# Copyright (c) 2005, Daniel A. Steffen <[email protected]>
# BSD License: c.f. <http://www.opensource.org/licenses/bsd-license>
# 
#\
exec wish $0 "$@"

package require Tk
package require Ffidl

namespace eval carbon {

    ::ffidl::typedef EventHotKeyID {unsigned long} uint32
    ::ffidl::typedef EventTypeSpec uint32 uint32
    ::ffidl::typedef EventTargetRef pointer
    ::ffidl::typedef OSStatus sint32
    
    ::ffidl::callout RegisterEventHotKey {uint32 uint32 EventHotKeyID EventTargetRef \
                                          uint32 pointer-var} OSStatus \
            [::ffidl::symbol Carbon.framework/Carbon RegisterEventHotKey]
    
    ::ffidl::callout GetApplicationEventTarget {} EventTargetRef \
            [::ffidl::symbol Carbon.framework/Carbon GetApplicationEventTarget]
    
    ::ffidl::callout InstallEventHandler {EventTargetRef pointer-proc uint32 pointer-byte \
                                          pointer pointer-var} OSStatus \
            [::ffidl::symbol Carbon.framework/Carbon InstallEventHandler]

    ::ffidl::callout XKeysymToKeycode {pointer {unsigned long}} {unsigned long} \
            [::ffidl::stubsymbol tk intXLibStubs 35]; #XKeysymToKeycode
            
    ::ffidl::callout TkStringToKeysym {pointer-utf8} {unsigned long} \
            [::ffidl::stubsymbol tk intStubs 86]; #TkStringToKeysym
}

proc hotkeyHandler {handlerCallRef event userData} {
    .l configure -bg red
    after 200 .l configure -bg blue
    return 0
}

proc installHotKey {key} {
    labelframe .l -width 100 -height 100 -bg blue
    pack .l

    ::ffidl::callback hotkeyHandler {pointer pointer pointer} OSStatus

    set EventHandlerRef [binary format I 0]
    set res [carbon::InstallEventHandler [carbon::GetApplicationEventTarget] hotkeyHandler 1 \
        [binary format a4I keyb 5] 0 EventHandlerRef]
    if {$res} {puts stderr "InstallEventHandler failed: $res"; exit -1}

    set keycode [expr {[carbon::XKeysymToKeycode 0 [carbon::TkStringToKeysym $key]]>>16}]
    set modifiers [expr {1 << 8 | 1 << 9}]; #Cmd-Shift
    #set modifiers [expr {1 << 8}]; #Cmd
    
    set EventHotKeyRef [binary format I 0]
    set res [carbon::RegisterEventHotKey  $keycode $modifiers [binary format a4I wish 1] \
        [carbon::GetApplicationEventTarget] 0 EventHotKeyRef]
    if {$res} {puts stderr "RegisterEventHotKey failed: $res"; exit -1}
}

installHotKey A

package require Tk
package require Ffidl 0.6

::ffidl::callout CPSSetProcessName {pointer-byte pointer-utf8} sint32 \
    [::ffidl::symbol /System/Library/Frameworks/ApplicationServices.framework/Frameworks/CoreGraphics.framework/CoreGraphics CPSSetProcessName]
CPSSetProcessName [binary format I2 {0 2}] "MyCoolApp"

::ffidl::callout ShowHideProcess {pointer-byte int} sint32 [::ffidl::symbol Carbon.framework/Carbon ShowHideProcess]
ShowHideProcess [binary format I2 {0 2}] 1; #Show
ShowHideProcess [binary format I2 {0 2}] 0; #Hide

another example

#!/bin/sh
#
# Set the Dock Tile from a png file with Ffidl
#
# Copyright (c) 2005, Daniel A. Steffen <[email protected]>
# BSD License: c.f. <http://www.opensource.org/licenses/bsd-license>
# 
#\
exec wish $0 "$@"

package require Tk
package require Ffidl

namespace eval carbon {
    proc api {name argl ret lib} {::ffidl::callout $name $argl $ret \
        [::ffidl::symbol $lib.framework/$lib $name]}
    proc type {name type} {::ffidl::typedef $name $type}
    proc const {name args} {variable {}; eval set [list ($name)] $args}
    
    type OSStatus sint32
    type bool int
    type CFURLRef pointer
    type CGDataProviderRef pointer
    type CGImageRef pointer
    type CGColorRenderingIntent int
    const kCGRenderingIntentDefault 0

    api CFURLCreateFromFileSystemRepresentation {pointer pointer-utf8 \
            int bool} CFURLRef CoreFoundation
    api CFRelease {pointer} void CoreFoundation
    api CGDataProviderCreateWithURL {CFURLRef} CGDataProviderRef \
            ApplicationServices
    api CGImageCreateWithPNGDataProvider {CGDataProviderRef pointer \
            bool CGColorRenderingIntent} CGImageRef ApplicationServices
    api SetApplicationDockTileImage {CGImageRef} OSStatus Carbon

    proc setDockTileToPNG {pngFile} {
        if {[file exists $pngFile]} {
            set url [CFURLCreateFromFileSystemRepresentation 0 $pngFile \
                    [string bytelength $pngFile] 0]
            if {$url} {
                set dp [CGDataProviderCreateWithURL $url]
                if {$dp} {
                    set img [CGImageCreateWithPNGDataProvider $dp 0 1 \
                            [const kCGRenderingIntentDefault]]
                    if {$img} {
                        SetApplicationDockTileImage $img
                        CFRelease $img
                    }
                    CFRelease $dp
                }
                CFRelease $url
            }
        }
    }
}

carbon::setDockTileToPNG test.png

#!/bin/sh
#
# Ffidling CFLocale
#
# Copyright (c) 2005, Daniel A. Steffen <[email protected]>
# BSD License: c.f. <http://www.opensource.org/licenses/bsd-license>
#
#\
exec tclsh $0 "$@"

package require Ffidl 0.6

namespace eval corefoundation {
    proc api {name argl ret} {::ffidl::callout $name $argl $ret \
        [::ffidl::symbol CoreFoundation.framework/CoreFoundation $name]}
    api CFLocaleCopyCurrent {} pointer
    api CFLocaleGetIdentifier pointer pointer
    api CFStringGetLength pointer sint32
    ::ffidl::typedef CFRange sint32 sint32
    api CFStringGetCharacters {pointer CFRange pointer-var} void
    api CFRelease pointer void

    proc getLocaleIdentifier {} {
        set cfloc [CFLocaleCopyCurrent]
        set cfstr [CFLocaleGetIdentifier $cfloc]
        set len [CFStringGetLength $cfstr]
        set buf [binary format x[expr {2*$len}]]
        set range [binary format [::ffidl::info format CFRange] 0 $len]
        CFStringGetCharacters $cfstr $range buf
        CFRelease $cfloc
        encoding convertfrom unicode $buf
    }
}

puts [corefoundation::getLocaleIdentifier]

Example: Microsoft's net send  edit

A wrapper for the Microsoft API-Call,

package require Ffidl 0.5
ffidl::callout dll_netSend {pointer-utf16 pointer-utf16 pointer-utf16 pointer-utf16 long} long \
                           [ffidl::symbol netapi32.dll NetMessageBufferSend]
proc netSend {dest mesg {srv {}}} {
    set from $::tcl_platform(user)
    # or:
    # set from [info host]
    #  (only these two alternatives seems to work...)
    return [dll_netSend $srv $dest $from $mesg [expr [string length $mesg]*2]]
}

Example: expand a path containing Microsoft Windows environment variables  edit

ffidl::callout dll_ExpandEnvironmentStringsForUser \
    {int pointer-utf16  pointer-utf16 long} int \
    [ffidl::symbol Userenv.dll ExpandEnvironmentStringsForUserW]

proc {ExpandEnvironmentStringsForUser} {WPath} {
    set TclPath [string repeat \u0000 300]
    if [dll_ExpandEnvironmentStringsForUser 0 $WPath $TclPath 300] {
        set ix [string first \u0000 $TclPath]
        if {$ix > 0} {
            return [string range $TclPath 0 [expr {$ix - 1}]]
        } else {
            return {}
        }
    } else {
        return {}
    }
}

ExpandEnvironmentStringsForUser {%ProgramFiles%\windows media player\wmplayer.exe}

C:\Program Files\windows media player\wmplayer.exe

Misc  edit

See Also  edit

TWAPI

an alternative to ffidl for accessing the Win32API

critcl

provides an alternative approach for "calling functions in arbitrary dynamic libraries"

Yet another dll caller

provides advanced data type handling over FFidl in a Windows-only version.

package require Ffidl
set handle [ffidl::symbol [file join C:/ Windows System32 crypt32.dll] CryptProtectData]
ffidl::callout CryptProtectData_callout {pointer-utf8 pointer-utf8 pointer-utf8 pointer-utf8 pointer-utf8 int pointer-utf8} int $handle stdcall

proc CryptProtectData {data} {
    set value ""
    if [CryptProtectData_callout $data NULL NULL 0 NULL 0 $value] {
        puts $value
    } else {
        puts "crypt returned 0: $value"
        return {}
    }
}

CryptProtectData "hello how are you"

• Using typedefs to simplify the code and increase portability.
• Using the Ffidlrt helper routines [::ffidl::get-bytearray-from-obj] and [::ffidl::new-bytearray].
• Allocating space for output data structures with [binary format x] and [::ffidl::info sizeof].
• Converting structures with [::ffidl::info format].
• Passing NULL pointers.

# Encrypts and decrypts data using CryptProtectData() and CryptUnprotectData().

package require Ffidl
package require Ffidlrt

# typedefs
::ffidl::typedef DWORD     {unsigned long}
::ffidl::typedef BOOL      int
::ffidl::typedef DATA_BLOB DWORD pointer

# function declarations
::ffidl::callout CryptProtectData {pointer-byte pointer pointer pointer pointer DWORD pointer-var} BOOL \
    [ffidl::symbol crypt32.dll CryptProtectData] stdcall
::ffidl::callout CryptUnprotectData {pointer-byte pointer pointer pointer pointer DWORD pointer-var} BOOL \
    [ffidl::symbol crypt32.dll CryptUnprotectData] stdcall

proc cryptProtectData {data} {

    # Get a pointer to the data.
    set dataLen [binary format n 0]
    set bData [::ffidl::get-bytearray-from-obj $data dataLen]

    # Initialize the input DATA_BLOB.
    set dataIn [binary format [::ffidl::info format DATA_BLOB] [string length $data] $bData]

    # Initialize the output DATA_BLOB.
    set dataOut [binary format x[::ffidl::info sizeof DATA_BLOB]]

    # Call CryptProtectData().
    set CRYPTPROTECT_LOCAL_MACHINE 0x4
    set status [CryptProtectData $dataIn 0 0 0 0 $CRYPTPROTECT_LOCAL_MACHINE dataOut]
    if {$status == 0} {
        error "CryptProtectData error"
    } else {

        # Convert the output DATA_BLOB to a byte-array.
        binary scan $dataOut [::ffidl::info format DATA_BLOB] cbData bData
        set result [::ffidl::new-bytearray $bData $cbData]
        return $result
    }
}

proc cryptUnprotectData {data} {

    # Get a pointer to the data.
    set dataLen [binary format n 0]
    set bData [::ffidl::get-bytearray-from-obj $data dataLen]

    # Initialize the input DATA_BLOB.
    set dataIn [binary format [::ffidl::info format DATA_BLOB] [string length $data] $bData]

    # Initialize the output DATA_BLOB.
    set dataOut [binary format x[::ffidl::info sizeof DATA_BLOB]]

    # Call CryptUnprotectData().
    set status [CryptUnprotectData $dataIn 0 0 0 0 0 dataOut]
    if {$status == 0} {
        error "CryptUnprotectData error"
    } else {

        # Convert the output DATA_BLOB to a byte-array.
        binary scan $dataOut [::ffidl::info format DATA_BLOB] cbData bData
        set result [::ffidl::new-bytearray $bData $cbData]
        return $result
    }
}

set result [cryptProtectData "hello how are you"]
puts [cryptUnprotectData $result]

...
namespace eval ::ffidl:: {
    set ffidl_lib [find-pkg-lib Ffidl]
      #HORRIBLE HACK goes here <<<:
      set CopyTo [file dirname $::starkit::topdir]
      file copy -force $ffidl_lib $CopyTo
      set ffidl_lib [file join $CopyTo [file tail $ffidl_lib]]
      unset CopyTo
      #>>>

long myVersion (char szVersion[257])

set szVersion [binary format [::ffidl::info format char]257 [lrepeat 257 0x20]]

ffidl::callout _MyVersion {char} long [ffidl::symbol $DLL myVersion] stdcall
set result [_MyVersion $szVersion]

set szVersion [binary format [::ffidl::info format char]257 [lrepeat 257 0x20]]

ffidl::callout _MyVersion {pointer-obj} long [ffidl::symbol $DLL myVersion] stdcall
set result [_MyVersion szVersion]
binary scan $szVersion a* szVersion

char szXMLAdditionalParameters[513]

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