[Haskell-cafe] a minimal Windows program in Haskell?

[Nun Aurbiz]

How do I make a minimal Windows application in Haskell? I know there are Win API bindings in the libraries, and of course the ffi lets you call into and out of C, but I have no sense of how to bring it all together. I can't find any samples either.

Is the Haskell code the "main" application and you just ffi into the Win API? Or does it ffi into a win_main.c that I write? Or is the win_main.c the "main" application and it calls into Haskell?

Here is what I am talking about by a "minimal Windows application" (written in psuedo C code).

#define WIN32_LEAN_AND_MEAN
#include <windows.h>

LRESULT CALLBACK windowsProcedure(..) {
switch(message) {
case WM_CLOSE:
PostQuitMessage(0);
return 0;
}
return DefWindowProc(..);
}

int APIENTRY WinMain(..){
WNDCLASS window_class;
RegisterClass(&window_class)
window = CreateWindow(..);
ShowWindow(..);

while(true) {
/* do whatever */

while(PeekMessage(..))
if(msg.message == WM_QUIT)
return msg.wParam;
else
DispatchMessage(&msg);
}
return 0;
}

[Bulat Ziganshin]

Hello Nun,

How do I make a minimal Windows application in Haskell?  I know

you should look at Win32 package sources which includes small example
using WinAPI for "hello world" GUI application

but note that Win32 binding is far from complete. if i will start to
write WinAPI GUI app, i may prefer to do GUI part in C and communicate
to Haskell part via FFI

ps: http://www.haskell.org/ghc/dist/stable/dist/ghc-6.10.1-src.tar.bz2
ghc-6.10.1\libraries\Win32\examples

[Nun Aurbiz]

Bulat Ziganshin <***@gmail.com> wrote:
ps: http://www.haskell.org/ghc/dist/stable/dist/ghc-6.10.1-src.tar.bz2
ghc-6.10.1\libraries\Win32\examples

Thanks for this.

I noticed some errors in the sample that might help others:
1) you need to replace "win32" with "Win32" in the given command line instruction
2) the Win32 package in this link gives a type error during the "setup build" phase (expecting exception and given ioerror?) but you can compile the example against the Win32 package in ghc 6.8.3

[Bulat Ziganshin]

Hello Nun,

Post by Nun Aurbiz
2) the Win32 package in this link gives a type error during the
"setup build" phase (expecting exception and given ioerror?) but you
can compile the example against the Win32 package in ghc 6.8.3

of course - it's written against 6.10.1. you should download sources
of your GHC version and use example from it. look in
http://www.haskell.org/ghc/dist/stable/dist/old