More missing stuff...

git-svn-id: svn://localhost/ardour2/trunk@2645 d708f5d6-7413-0410-9779-e7cbd77b26cf

libs/glibmm2/examples/iochannel_stream/main.cc

@@ -0,0 +1,102 @@
+/* Copyright (C) 2004 The glibmm Development Team
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the Free
+ * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <glibmm.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <limits.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <iostream>
+#include <string>
+
+#include "fdstream.h"
+
+fdstream input_stream;
+Glib::RefPtr<Glib::MainLoop> mainloop;
+
+/*
+  send to the fifo with:
+  echo "Hello" > testfifo
+
+  quit the program with:
+  echo "Q" > testfifo
+*/
+
+// this will be our signal handler for read operations
+// it will print out the message sent to the fifo
+// and quit the program if the message was, or began
+// with, 'Q'
+bool MyCallback(Glib::IOCondition io_condition)
+{
+  if ((io_condition & Glib::IO_IN) == 0)
+  {
+    std::cerr << "Invalid fifo response" << std::endl;
+  }
+  else
+  {  
+    // stream for stdout (does the same as std::cout
+    // - this is an example of using fdstream for output)
+    fdstream out(1, false);
+    std::string text;
+    input_stream >> text;
+    out << text << std::endl;
+
+    if (text[0] == 'Q')
+      mainloop->quit();
+  }
+
+  return true;
+}
+
+
+int main( /* int argc, char *argv[] */)
+{
+  Glib::init();
+
+  // the usual Glib::Main object
+  mainloop = Glib::MainLoop::create();
+
+  if(access("testfifo", F_OK) == -1)
+  {
+    // fifo doesn't exit - create it
+    if (mkfifo("testfifo", 0666) != 0)
+    {
+      std::cerr << "error creating fifo" << std::endl;
+      return -1;
+    }
+  }
+ 
+  int read_fd = open("testfifo", O_RDONLY);
+  if(read_fd == -1)
+  {
+    std::cerr << "error opening fifo" << std::endl;
+    return -1;
+  }
+
+  input_stream.attach(read_fd);
+  input_stream.connect(sigc::ptr_fun(MyCallback), Glib::IO_IN);
+  
+  // and last but not least - run the application main loop
+  mainloop->run();
+
+  // now remove the temporary fifo
+  if(unlink("testfifo"))
+    std::cerr << "error removing fifo" << std::endl;
+
+  return 0;
+}