def test_return_string(self):
value = ctypes.create_string_buffer(b"Hello", 20)
value = (ctypes.c_char * 20)()
ret = self.driver.lib.write_in_charp(value, len(value))
value = value.value.decode('ascii')
self.assertEqual((ret, value, type(value)), (1, '28G11AC10T32', str))
ret, value = self.driver.lib.write_in_charp(RetStr(20), 20)
self.assertEqual((ret, value, type(value)), (1, '28G11AC10T32', str))
ret, value = self.driver.lib.write_in_charp(*RetStr(20))
self.assertEqual((ret, value, type(value)), (1, '28G11AC10T32', str))
def _return_handler(self, func_name, ret_value):
if ret_value < 0:
msg = 'Cannot obtain error message'
if not func_name == 'DAQmxGetExtendedErrorInfo':
err, msg = self.lib.DAQmxGetExtendedErrorInfo(
*RetStr(default_buf_size * 100))
if err < 0:
msg = 'Cannot obtain error message'
raise InstrumentError('In {}: {} ({})'.format(
func_name, msg, ret_value))
return ret_value
def take_image(self):
"""Image acquisition.
"""
self.queuebuffer(self.userbuffer, self.imagesizebytes)
self.command("AcquisitionStart")
self.waitbuffer(*RetStr(1))
self.command("AcquisitionStop")
self.flush()
image = np.fromstring(self.userbuffer,
dtype=np.uint32,
count=self.length)
image.shape = (self.height, self.width)
return image
def take_image(self, numbuff, numframes):
"""Image acquisition with circular buffer.
"""
imagesizebytes = self.getint("ImageSizeBytes")
userbuffer = []
for i in range(numbuff):
userbuffer.append(ct.create_string_buffer(' ' * imagesizebytes))
self.queuebuffer(userbuffer, imagesizebytes)
self.command("AcquisitionStart")
for i in range(numbuff):
self.waitbuffer(*RetStr(1))
self.queuebuffer(userbuffer[i], imagesizebytes)
self.command("AcquisitionStop")
self.flush()
image = np.fromstring(userbuffer[0],
dtype=np.uint32,
count=self.length)
image.shape = (self.height, self.width)
return image
def device_names(self):
"""Indicates the names of all devices installed in the system.
"""
err, buf = self.lib.DAQmxGetSysDevNames(*RetStr(default_buf_size))
names = tuple(n.strip() for n in buf.split(',') if n.strip())
return names