Exception when creating a Thread with Windows

[Steven Schveighoffer]

On Saturday, 5 July 2025 at 10:39:13 UTC, stef wrote:
> Hello,
>
> I'm totally new using D. I'm trying to create a thread using 
> this code:
>
>
> ```d
> …
> extern (Windows)
> int WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
> 	LPSTR lpCmdLine, int nCmdShow)
> …
>
> ```
>
> I'm testing this program using Visual Studio Code. I 
> systematically have an exception (not trapped, I don't know why 
> by the catch) when it's calling thread.start(). I can see it 
> only with the debugger.
>
> The exception is:
>
> W32/0xC0000005
> Unhandled exception at 0x00007FFB5F379463 (ntdll.dll) in 
> threads-debug.exe: 0xC0000005: Access violation writing 
> location 0x0000000000000024.
>
> Is it a mistake or a bug ?

By using WinMain, You are bypassing the runtime startup.

Check out this article: https://wiki.dlang.org/D_for_Win32

-Steve