Krasimir Angelov wrote:

How many times you tried to use putStrLn from Haskell or printf from C when you are building DLL loaded in GUI application?

This simply doesn't work because by default the GUI application doesn't have console window. The solution is to use allocConsole/freeConsole from the attached library.

Example:

do allocConsole ..... ..... putStrLn "Hello, world!" ..... ..... freeConsole

This could be a good addition to the standard Win32 library if someone take care to integrate it.

So that we don't lose this: will someone propose a patch to packages/Win32? Cheers, Simon