Does gvimfullscreen.dll working with gVim 9.0 on Windows?

Question

I used to use gvimfullscreen.dll to toggle a full screen window state on gvim for Windows. It made gvim full screen, not maximised, with no titlebar.

I have not used gvim on Windows for some time until recently and it's no longer working for me. The many mentions of this file I have found on the internet are old and there are no discussions about it no longer working. I am using gvim for Windows 9.0 and I probably last used it successfully with v8.0.

I get this error:

Error detected while processing function ToggleFullScreen:

line 4:

E364: Library call failed for "ToggleFullScreen()"

https://www.vim.org/scripts/script.php?script_id=2596

" Fullscreen with Alt-Enter
function! ToggleFullScreen()
  if has('gui_gtk2')
    :call system("wmctrl -ir " . v:windowid . " -b toggle,fullscreen")
  elseif has('gui_win32')
    :call libcallnr(expand("$VIM") . "/win/gvimfullscreen.dll", "ToggleFullScreen", 0)
  endif
endfunction
set <M-CR>=\<ESC>\<CR>
map <silent> <M-CR> :call ToggleFullScreen()<CR>

Answer 1

If you are using a 64-bit version of Vim you have to adapt the call to use the 64 bit version of the dll:

" Fullscreen with Alt-Enter
function! ToggleFullScreen()
  if has('gui_gtk2')
    :call system("wmctrl -ir " . v:windowid . " -b toggle,fullscreen")
  elseif has('gui_win32')
    :call libcallnr(expand("$VIM") . "/win/gvimfullscreen_64.dll", "ToggleFullScreen", 0)
  endif
endfunction
set <M-CR>=\<ESC>\<CR>
map <silent> <M-CR> :call ToggleFullScreen()<CR>

The gvimfullscreen_64.dll is available at: gvimfullscreen_64.dll

The code suppose the dll is placed in a win folder next to the vim90 folder.

" Fullscreen with Alt-Enter
function! ToggleFullScreen()
  if has('gui_gtk2')
    :call system("wmctrl -ir " . v:windowid . " -b toggle,fullscreen")
  elseif has('gui_win32')
    :call libcallnr(expand("$VIM") . "/vim90/win/gvimfullscreen_64.dll", "ToggleFullScreen", 0)
  endif
endfunction
set <M-CR>=\<ESC>\<CR>
map <silent> <M-CR> :call ToggleFullScreen()<CR>

If the win folder is a subfolder of the vim90 folder the code must be adapted as follow:

You can determine if you are using a 32 bit or a 64 bit version of Vim by looking at the second line of the result of the :version Vim command

VIM - vi Improved 9.0 ...
MS-Windows 64-bit GUI/Console version ...
...

vs.

VIM - vi Improved 9.0 ...
MS-Windows 32-bit GUI/Console version ...
...

Answer 2

I could not get gvimfullscreen.dll working and searching the web showed that quite a few people have had this problem but there was no solution.

EDIT: This comment solves the problem, as I had forgotten that I had defined $VIM to another location.

I ended up using this plugin: https://github.com/kkoenig/wimproved.vim, but I found it had the same problem as gvimfullscreen.dll in that it did not return to the previous screen size when the window is restored. I then found this vimscript which saves and restores the screen size:

https://vim.fandom.com/wiki/Restore_screen_size_and_position

So in my gvimrc I source that script and use some logic to use the plugin and restore the screen size using the functions from the script.

" Restore window positions
source $VIM/vimrc.d/restore_position.vim

" Fullscreen toggle with F11
function! ToggleFullScreen()
  if has('gui_gtk2')
    call system("wmctrl -ir " . v:windowid . " -b toggle,fullscreen")
  elseif has('gui_win32')
    if !exists("s:fullscr")
      let s:fullscr = 0
    endif
    if (s:fullscr == 0)
      call ScreenSave()
      WToggleFullscreen
      let s:fullscr = 1
    elseif (s:fullscr == 1)
      WToggleFullscreen
      call ScreenRestore()
      let s:fullscr = 0
    endif
  endif
endfunction
map <silent> <F11> :call ToggleFullScreen()<CR>

Everything works great now.