[Contribution] How to use Crystal / WebView bindings without console : #23
Description
#hide_console.cr
hide_console.cr
Source :
https://forum.crystal-lang.org/t/compilation-switch-to-avoid-the-debug-console-under-windows/5356/6
#Usage:
require "../webview"
require "./hide_console"
def runApp()
wv = Webview.window(1500, 1000, Webview::SizeHints::NONE, "Hello WebView", "http://crystal-lang.org")
wv.run
wv.destroy
end
runApp()
#Code :
{% if flag? :windows %}
module Crystal::System::FileDescriptor
def self.from_stdio(fd)
console_handle = false
handle = LibC._get_osfhandle(fd)
if handle != -1 && handle != -2
handle = LibC::HANDLE.new(handle)
# TODO: use `out old_mode` after implementing interpreter out closured var
old_mode = uninitialized LibC::DWORD
if LibC.GetConsoleMode(handle, pointerof(old_mode)) != 0
console_handle = true
if fd == 1 || fd == 2 # STDOUT or STDERR
if LibC.SetConsoleMode(handle, old_mode | LibC::ENABLE_VIRTUAL_TERMINAL_PROCESSING) != 0
at_exit { LibC.SetConsoleMode(handle, old_mode) }
end
end
end
end
io = IO::FileDescriptor.new(fd, blocking: true)
# Set sync or flush_on_newline as described in STDOUT and STDERR docs.
# See https://crystal-lang.org/api/toplevel.html#STDERR
if console_handle
io.sync = true
else
io.flush_on_newline = true
end
io
end
end
@[Link(ldflags: "/ENTRY:wWinMainCRTStartup")]
@[Link(ldflags: "/SUBSYSTEM:WINDOWS")]
lib LibCrystalMain
end
lib LibC
fun CommandLineToArgvW(lpCmdLine : LPWSTR, pNumArgs : Int*) : LPWSTR*
fun LocalFree(hMem : Void*) : Void*
end
fun wWinMain(
hInstance : Void*,
hPrevInstance : Void*,
pCmdLine : LibC::LPWSTR,
nCmdShow : LibC::Int
) : LibC::Int
argv = LibC.CommandLineToArgvW(pCmdLine, out argc)
wmain(argc, argv)
ensure
LibC.LocalFree(argv) if argv
end
{% end %}