Hello,
I wrote a small test code with WinApi:

----------------------------------------------------
import core.runtime;
import std.utf;

import core.sys.windows.windows;
import core.sys.windows.wingdi;

class Test
{
    public this() nothrow
    {

    }
}

extern(Windows)
int WinMain(HINSTANCE hInstance, HINSTANCE, LPSTR lpCmdLine, int nCmdShow)
{
    new Test(); // error is here
    return 0;
}
----------------------------------------------------

When I run it, there is an error: Program exited with code 1.

If I comment "new Test();" - no error happens. Why? How to create instances of classes?

DMD v2.077.1, Windows 10.

On Thursday, 19 April 2018 at 08:13:00 UTC, Andrey wrote:
> Hello,
> I wrote a small test code with WinApi:
>
> ----------------------------------------------------
> import core.runtime;
> import std.utf;
>
> import core.sys.windows.windows;
> import core.sys.windows.wingdi;
>
> class Test
> {
>     public this() nothrow
>     {
>
>     }
> }
>
> extern(Windows)
> int WinMain(HINSTANCE hInstance, HINSTANCE, LPSTR lpCmdLine, int nCmdShow)
> {
>     new Test(); // error is here
>     return 0;
> }
> ----------------------------------------------------
>
> When I run it, there is an error: Program exited with code 1.
>
> If I comment "new Test();" - no error happens. Why?

The run-time is not already initialized but the "new" operator relies on it.

On Thursday, 19 April 2018 at 08:24:55 UTC, user1234 wrote:
> The run-time is not already initialized but the "new" operator relies on it.

What will be a solution?

On Thursday, 19 April 2018 at 08:37:19 UTC, Andrey wrote:
> What will be a solution?

It seems to me that I found a solution - just replace WinMain() with main().

On Thursday, 19 April 2018 at 11:21:52 UTC, Andrey wrote:
> On Thursday, 19 April 2018 at 08:37:19 UTC, Andrey wrote:
>> What will be a solution?
>
> It seems to me that I found a solution - just replace WinMain() with main().

That's fine when you want a console app, but it leaves you with a console window automatically popping up if you create a windowed app.

When using WinMain, you have to manually setup and tear down DRuntime as described in the wiki[1]. Alternatively, you can get rid of the console window with a main function via linker flags -- when using OPTLINK (the default):

-L/SUBSYSTEM:windows

should be enough. With -m32mscoff or -m64, which uses the MS linker, you'll both that and this:

-L/ENTRY:mainCRTStartup

[1] https://wiki.dlang.org/D_for_Win32