thread 'main' panicked at 'called Option::unwrap() on a None value'

[Misaka299]

C:/Users/me/.cargo/bin/cargo.exe run --color=always --package figure_sauce --bin figure_sauce
    Finished dev [unoptimized + debuginfo] target(s) in 0.24s
     Running `target\debug\figure_sauce.exe`
DEBUG [druid::localization] available locales [], current en-US
DEBUG [druid::localization] resolved: [en-US]
DEBUG [druid_shell::platform::windows::window] dxgi factory pointer = 0x212e39d6980
DEBUG [druid_shell::platform::windows::window] 0x212e39f3650: desc = Some("NVIDIA GeForce GTX 965M"), vram = 4252762112
DEBUG [druid_shell::platform::windows::window] 0x212e39f3b00: desc = Some("Intel(R) HD Graphics 530"), vram = 134217728
DEBUG [druid_shell::platform::windows::window] 0x212e39a1ff0: desc = Some("Microsoft Basic Render Driver"), vram = 0
DEBUG [druid_shell::platform::windows::window] adapter = 0x212e39f3650
DEBUG [druid_shell::platform::windows::window] swap chain res = 0x0, pointer = 0x212e5902ed0
thread 'main' panicked at 'called `Option::unwrap()` on a `None` value', C:\Users\me\.cargo\git\checkouts\druid-f71533f3d81c0bc8\e677854\druid-shell\src\platform\windows\window.rs:366:46
stack backtrace:
   0: std::panicking::begin_panic_handler
             at /rustc/7eac88abb2e57e752f3302f02be5f3ce3d7adfb4\/library\std\src\panicking.rs:483
   1: core::panicking::panic_fmt
             at /rustc/7eac88abb2e57e752f3302f02be5f3ce3d7adfb4\/library\core\src\panicking.rs:85
   2: core::panicking::panic
             at /rustc/7eac88abb2e57e752f3302f02be5f3ce3d7adfb4\/library\core\src\panicking.rs:50
   3: core::option::Option<mut piet_direct2d::d2d::DeviceContext*>::unwrap<mut piet_direct2d::d2d::DeviceContext*>
             at C:\Users\me\.rustup\toolchains\stable-x86_64-pc-windows-msvc\lib\rustlib\src\rust\library\core\src\option.rs:383
   4: druid_shell::platform::windows::window::WndState::render
             at C:\Users\me\.cargo\git\checkouts\druid-f71533f3d81c0bc8\e677854\druid-shell\src\platform\windows\window.rs:366
   5: druid_shell::platform::windows::window::{{impl}}::window_proc::{{closure}}
             at C:\Users\me\.cargo\git\checkouts\druid-f71533f3d81c0bc8\e677854\druid-shell\src\platform\windows\window.rs:697
   6: druid_shell::platform::windows::window::MyWndProc::with_wnd_state<closure-3,tuple<>>
             at C:\Users\me\.cargo\git\checkouts\druid-f71533f3d81c0bc8\e677854\druid-shell\src\platform\windows\window.rs:422
   7: druid_shell::platform::windows::window::{{impl}}::window_proc
             at C:\Users\me\.cargo\git\checkouts\druid-f71533f3d81c0bc8\e677854\druid-shell\src\platform\windows\window.rs:681
   8: druid_shell::platform::windows::window::win_proc_dispatch
             at C:\Users\me\.cargo\git\checkouts\druid-f71533f3d81c0bc8\e677854\druid-shell\src\platform\windows\window.rs:1435
   9: CallWindowProcW
  10: DispatchMessageW
  11: IsWindowVisible
  12: KiUserCallbackDispatcher
  13: NtUserDispatchMessage
  14: DispatchMessageW
  15: InputFocusMonitorCreate
  16: InputFocusMonitorCreate
  17: TF_Notify
  18: TF_Notify
  19: TF_SetShowFloatingStatus
  20: TF_SetShowFloatingStatus
  21: TF_SetShowFloatingStatus
  22: TF_SetShowFloatingStatus
  23: SetInputScopes2
  24: SetInputScopes2
  25: SetInputScopes2
  26: TF_PostAllThreadMsg
  27: CtfImeSelectEx
  28: SetInputScopes2
  29: SetInputScopes2
  30: TF_SetShowFloatingStatus
  31: TF_SetShowFloatingStatus
  32: TF_SetShowFloatingStatus
  33: SetInputScopes2
  34: CtfImeProcessCicHotkey
  35: CtfImeProcessCicHotkey
  36: CtfImeAssociateFocus
  37: CtfImeAssociateFocus
  38: CtfImeAssociateFocus
  39: ImmSetActiveContext
  40: GetWindow
  41: GetWindowRgnBox
  42: GetDlgItem
  43: GetDlgItem
  44: CallWindowProcW
  45: DispatchMessageW
  46: IsWindowVisible
  47: KiUserCallbackDispatcher
  48: NtUserShowWindow
  49: druid_shell::platform::windows::window::WindowHandle::show
             at C:\Users\me\.cargo\git\checkouts\druid-f71533f3d81c0bc8\e677854\druid-shell\src\platform\windows\window.rs:1511
  50: druid_shell::window::WindowHandle::show
             at C:\Users\me\.cargo\git\checkouts\druid-f71533f3d81c0bc8\e677854\druid-shell\src\window.rs:153
  51: druid::app::AppLauncher<u32>::launch<u32>
             at C:\Users\me\.cargo\git\checkouts\druid-f71533f3d81c0bc8\e677854\druid\src\app.rs:177
  52: figure_sauce::main
             at .\src\main.rs:7
  53: core::ops::function::FnOnce::call_once<fn() -> core::result::Result<tuple<>, druid_shell::error::Error>,tuple<>>
             at C:\Users\me\.rustup\toolchains\stable-x86_64-pc-windows-msvc\lib\rustlib\src\rust\library\core\src\ops\function.rs:227
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
error: process didn't exit successfully: `target\debug\figure_sauce.exe` (exit code: 0xc0000409, STATUS_STACK_BUFFER_OVERRUN)

Process finished with exit code -1073740791 (0xC0000409)

This error message also appeared on my other computer, and it could not start normally. I am using examples.

use druid::widget::{Button, Flex, Label};
use druid::{AppLauncher, LocalizedString, PlatformError, Widget, WidgetExt, WindowDesc};

fn main() -> Result<(), PlatformError> {
    let main_window = WindowDesc::new(ui_builder);
    let data = 0_u32;
    AppLauncher::with_window(main_window)
        .use_simple_logger()
        .launch(data)
}

fn ui_builder() -> impl Widget<u32> {
    // The label text will be computed dynamically based on the current locale and count
    let text =
        LocalizedString::new("hello-counter").with_arg("count", |data: &u32, _env| (*data).into());
    let label = Label::new(text).padding(5.0).center();
    let button = Button::new("increment")
        .on_click(|_ctx, data, _env| *data += 1)
        .padding(5.0);

    Flex::column().with_child(label).with_child(button)
}

[cmyr]

What version of windows are you running? It looks like we're failing to create a render target. @raphlinus would have a better understanding of what would cause that, I'm not as familiar with the windows backend.

[rhzk]

I suspect what happens here is that he ends up getting a WM_PAINT message before WM_SIZE on startup,

Inside WM_PAINT render() is called but the render_target is not yet created, this happens inside WM_SIZE with rebuild_render_target() call.

Adding a state.rebuild_render_target(&self.d2d_factory, scale); towards the end in WM_CREATE might solve this problem.

Edit: Try this branch and let me know if it solved the problem: https://github.com/rhzk/druid/tree/1426

[Misaka299]

• [ ]

[Misaka299]

[Perlmint]

I suspect what happens here is that he ends up getting a WM_PAINT message before WM_SIZE on startup,

Inside WM_PAINT render() is called but the render_target is not yet created, this happens inside WM_SIZE with rebuild_render_target() call.

Adding a state.rebuild_render_target(&self.d2d_factory, scale); towards the end in WM_CREATE might solve this problem.

Edit: Try this branch and let me know if it solved the problem: https://github.com/rhzk/druid/tree/1426

I also encountered the same error.

As @rhzk suspected, WM_SIZE has not occurred before WM_PAINT.

I tried on the master branch. Below patch is worked for me.

--- a/druid-shell/src/platform/windows/window.rs
+++ b/druid-shell/src/platform/windows/window.rs
@@ -663,6 +663,10 @@ impl WndProc for MyWndProc {

                     let handle = self.handle.borrow().to_owned();
                     state.handler.connect(&handle.into());
+
+                    if let Err(e) = state.rebuild_render_target(&self.d2d_factory, scale) {
+                        log::error!("error building render target: {}", e);
+                    }
                 }
                 Some(0)
             }

As a workaround, Giving size with WindowDesc::window_size before launching the app is also worked.