RE: writing to stdout in an windows app without a console

On 16 February 2005 14:06, Duncan Coutts wrote:

On Wed, 2005-02-16 at 14:31 +0200, Krasimir Angelov wrote:

...

On Wed, 16 Feb 2005 12:01:06 +0000, Duncan Coutts wrote:

...

What's your opinion of making writing to stdout fail without raising an exception when the application is compiled with --subsystem windows?

I think the current behaviour is the right one. After all we don't have valid stdout/stdin and I don't see any reason to hide this.

True, but it's not the behaviour that other windows programming systems implement:

For example MS's C library happily ignores output to stdout:

#include

int main () { int res_code = fprintf(stdout, "hello world!\n"); fprintf(stderr, "res_code = %d\n", res_code);

return 0; }

now compiling with mingw's gcc: gcc testio.c -Xlinker --subsystem -Xlinker windows

and from a windows console (ie not a msys / cygwin window)

a.exe 2> err

then saying "type err" gives us the output: res_code = 13

I've seen this behaviour vary between versions of Windows (maybe even between versions of msvcrt, MS's C library). A strange experience we had with the Visual Studio extension was that I was initially just doing output to stderr from the DLL for debugging, which worked fine on my machine but crashed on other people's machines. We had to remove all uses of stdout/stderr from the Haskell DLL (including the runtime!) to get it going reliably. Cheers, Simon