"Steven Schveighoffer" <schvei...@yahoo.com> wrote in message news:op.vir82cineav...@localhost.localdomain... > On Thu, 09 Sep 2010 16:25:44 -0400, Nick Sabalausky <a...@a.a> wrote: > >> "Steven Schveighoffer" <schvei...@yahoo.com> wrote in message >> news:op.vipr20xfeav...@localhost.localdomain... >>> On Tue, 07 Sep 2010 16:51:48 -0400, Nick Sabalausky <a...@a.a> wrote: >>> >>>> >>>> Ah cool, looking forward to it. I was just about ready to launch into a >>>> bunch of std.process improvements myself ;) In the meantime, it seems >>>> that >>>> File has an undocumented constructor that takes a file handle instead >>>> of >>>> a >>>> filename, so that should work for me. >>> >>> Beware, it takes a file *descriptor*, which is different from a *HANDLE* >>> on windows. In writing the updated std.process I had to write D code >>> that >>> mimics the internals of DMC's runtime in order to translate between file >>> descriptors and handles, not a pretty sight... >>> >> >> I'm just feeding it the values I get from CreatePipe: >> http://msdn.microsoft.com/en-us/library/aa365152(VS.85).aspx >> >> Seems to be working fine, though... > > That won't work. I'm surprised it works at all. DMC maintains the list > of handles in an array, with the index of the array being the file > descriptor, and the value at that element being the HANDLE. If it's > working, you're extremely lucky that the unallocated slot at the index > that happens to be that HANDLE value has the same value as the HANDLE > itself. > > Or maybe I'm misunderstanding something... Walter? >
Here's a simplified example of what I'm doing: -------------------------------- > type mainapp.d import std.conv; import std.process; import std.stdio; import std.stream; import core.sys.windows.windows; // From here: http://msdn.microsoft.com/en-us/library/aa365152(VS.85).aspx extern(Windows) int CreatePipe( HANDLE* hReadPipe, HANDLE* hWritePipe, SECURITY_ATTRIBUTES* lpPipeAttributes, uint nSize); void main() { // Set up pipe HANDLE readHandle; HANDLE writeHandle; auto secAttr = SECURITY_ATTRIBUTES(SECURITY_ATTRIBUTES.sizeof, null, true); if(!CreatePipe(&readHandle, &writeHandle, &secAttr, 0)) throw new Exception("Couldn't create pipe"); auto pipeReader = new std.stream.File(readHandle, FileMode.In); // Run subapp system("subapp "~to!string(cast(size_t)writeHandle)); // Retrieve value from pipe int valueFromSubApp; pipeReader.read(valueFromSubApp); writeln("Received: ", valueFromSubApp); } > type subapp.d import std.conv; import std.stdio; import std.stream; import std.c.windows.windows; void main(string[] args) { auto writeHandle = cast(HANDLE)std.conv.to!size_t(args[1]); auto pipeWriter = new std.stream.File(writeHandle, FileMode.Out); int value = 777; writeln("Sending: ", value); pipeWriter.write(value); } > dmd subapp.d > dmd mainapp.d > mainapp Sending: 777 Received: 777 -------------------------------- Maybe the OS is just allowing me to use the wrong file descriptor?
