Add a new example

2008-07-29  Johan Dahlin  <johan@gnome.org>

    * examples/gio/downloader.py:
    Add a new example

    * gio/ginputstream.override:
    Use a string internally instead of a PyStringObject when
    in read_async. Create a new python string in finish and
    honor the number of bytes read.


svn path=/trunk/; revision=892

1 files changed, 61 insertions, 0 deletions

diff --git a/examples/gio/downloader.py b/examples/gio/downloader.py
new file mode 100644
index 00000000..36c803bb
--- /dev/null
+++ b/examples/gio/downloader.py
@@ -0,0 +1,61 @@
+# Example GIO based Asynchronous downloader
+
+import sys
+
+import glib
+import glib.option
+import gio
+
+
+class Downloader(object):
+    def __init__(self, uri):
+        self.total = 0
+        self.gfile = gio.File(uri)
+        self.loop = glib.MainLoop()
+
+        output = self.get_output_filename()
+        self.fd = open(output, 'w')
+        print 'Downloading %s -> %s' % (uri, output)
+
+        self.gfile.read_async(self.read_callback)
+
+    def get_output_filename(self):
+        basename = self.gfile.get_basename()
+        if basename == '/':
+            basename = 'index.html'
+        return basename
+
+    def stream_read_callback(self, stream, result):
+        data = stream.read_finish(result)
+        if not data:
+            self.data_finished()
+            return
+        self.data_read(data)
+        stream.read_async(4096, self.stream_read_callback)
+
+
+    def read_callback(self, gfile, result):
+        stream = gfile.read_finish(result)
+        stream.read_async(4096, self.stream_read_callback)
+
+    def data_read(self, data):
+        self.fd.write(data)
+        self.total += len(data)
+
+    def data_finished(self):
+        print '%d bytes read' % (self.total,)
+        self.loop.quit()
+
+    def run(self):
+        self.loop.run()
+
+def main(args):
+    if len(args) < 2:
+        print 'Needs a URI'
+        return 1
+
+    d = Downloader(args[1])
+    d.run()
+
+if __name__ == '__main__':
+    sys.exit(main(sys.argv))