cleanups before attempting gobject base

python/test.py

@@ -3,10 +3,15 @@
 import logging
 import gc
 
+import gobject
+
 import vipsimage
 
 logging.basicConfig(level = logging.DEBUG)
 
+# should be able to find vipsimage, hopefully
+print gobject.type_from_name('VipsImage')
+
 # test unref
 for i in range (1,10):
     a = vipsimage.VipsImage('/home/john/pics/healthygirl.jpg')
@@ -25,10 +30,17 @@ print 'xoffset =', a.xoffset()
 print 'yoffset =', a.yoffset()
 
 # should raise an error
-# a = vipsimage.VipsImage('banana')
+a = vipsimage.VipsImage('banana')
+
+# try calling a vips8 method
+a = vipsimage.VipsImage('/home/john/pics/healthygirl.jpg')
+b = vipsimage.VipsImage('/home/john/pics/babe.jpg')
+c = a.add(b)
 
 print 'starting shutdown ...'
 del a
+del b
+del c
 # sometimes have to do several GCs to get them all, not sure why
 for i in range(10):
 	gc.collect ()

python/vipsimage.py

@@ -101,6 +101,16 @@ vips_image_get_xres.restype = ctypes.c_double;
 vips_image_get_yres = libvips.vips_image_get_yres
 vips_image_get_yres.restype = ctypes.c_double;
 
+vips_operation_new = libvips.vips_operation_new
+vips_operation_new.argtypes = [ctypes.c_char_p]
+vips_operation_new.restype = ctypes.c_void_p
+vips_operation_new.errcheck = vipsobject.check_pointer_return
+
+def vips_call_instance(self, name, args):
+    logging.debug('vipsimage: vips_call_instance name=%s, self=%s, args=%s' % 
+                  (name, self, args))
+    operation = vips_operation_new(name)
+
 class VipsImage(vipsobject.VipsObject):
     """Manipulate a libvips image."""
 
@@ -120,6 +130,10 @@ class VipsImage(vipsobject.VipsObject):
 
         self.enable_finalize()
 
+    def __getattr__(self, name):
+        logging.debug('vipsimage: __getattr__ %s' % name)
+        return lambda *args: vips_call_instance(self, name, args)
+
     def width(self):
         return libvips.vips_image_get_width(self.vipsobject)
 

python/vipsobject.py

@@ -12,6 +12,8 @@ import logging
 import sys
 import ctypes
 
+import gobject
+
 import finalizable
 
 # .15 is 7.25+ with the new vips8 API
@@ -27,7 +29,7 @@ def class_value(classobject, value):
 
     return 'unknown'
 
-class Error(Exception):
+class VipsError(Exception):
 
     """An error from libvips.
 
@@ -48,12 +50,12 @@ class Error(Exception):
 # handy checkers, assign to errcheck
 def check_int_return(result, func, args):
     if result != 0:
-        raise Error('Error calling vips function %s.' % func.__name__)
+        raise VipsError('Error calling vips function %s.' % func.__name__)
     return result
 
 def check_pointer_return(result, func, args):
     if result == None:
-        raise Error('Error calling vips function %s.' % func.__name__)
+        raise VipsError('Error calling vips function %s.' % func.__name__)
     return result
 
 vips_error_buffer = libvips.vips_error_buffer
@@ -80,5 +82,3 @@ class VipsObject(finalizable.Finalizable):
         logging.debug('vipsobject: init')
 
         self.vipsobject = None
-
-