Re: [Haskell-cafe] avoiding command window with wxHaskell on Windows?

At 8:13 PM +0300 6/30/07, Esa Ilari Vuokko wrote:

On 6/30/07, Duncan Coutts wrote:

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On Fri, 2007-06-29 at 23:22 -0400, Dean Herington wrote:

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Date: Mon, 25 Jun 2007 20:19:50 -0400

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With gtk2hs, using "-optl-mwindows" as a command line option for GHC lets me get rid of this window. Perhaps it will do the same for wxHaskell?

Yes, that did the trick! Thanks a lot!

But now I've discovered that using "-optl-mwindows" creates a program that doesn't work when invoked from a command line. Is there any way to create a program that can work when invoked either from a command line or through double-clicking?

You'll have to be a bit more specific about what you mean. Perhaps you mean that when launched from the command line you cannot interact with the program via that command line interface. That is indeed standard windows behaviour.

You can create new terminals at runtime using Win32 functions, but I'm not sure if you can figure out if the program was launched from a terminal and associate with that terminal.

But perhaps you meant something else.

Assuming it's not something else.

As far as I know, the console/non-console application is marked in exe-header, and you can, in principle, have two entrypoints to a program, one for console and one without. Unfortunately that's not supported by most tools (and probably none outside Microsoft toolchains.)

So, in practice, either you make console applications, or non-console application.

It turns out I was confused (due I think to terribly slow network response). I have experimented more and believe I understand: -optl-mwindows creates a program that is suitable for "launching" (by either double-clicking or via a command line). The program so launched does not have a console or any direct way to communicate to the launcher. In particular, the launcher continues on its way immediately and cannot obtain the launchee's termination status. For the application I'm building, besides being able to launch it as above, I want also to be able to "invoke" it (normally from a command line). A program so invoked can interact with its invoker, and the invoker awaits the program's completion and gets its termination status. From what Esa said, it appears unlikely that a single .exe can be built easily using Haskell and wxHaskell that can be both launched and invoked. (In which case being able to produce a shared library containing the common code for the two .exe files would be nice!) Thanks for all the replies. Dean