How to get a VA Design up and running in a Python environment

B.Ru · Jul 10th 2018

Python

# IMPORT
print('Importing SiSo Wrapper')
try:
import SiSoPyInterface as s
except ImportError:
raise ImportError('SiSo module not loaded successfully')
print('Runtime Version', s.Fg_getSWVersion())
# IMPORT additional modules
import sys
import time
# for "s.getArrayFrom", to handle grabbed image as NumPy array
print('Importing NumPy', end='')
import numpy as np
print('Version', np.__version__)
# Additional Class definition
# Data for APC Callback
class MyApcData:
fg = None
port = 0
mem = None
displayid = 0
def __init__(self, fg, port, mem, displayid):
self.fg = fg
self.port = port
self.mem = mem
self.displayid = displayid
global_imgNr = -1
# Callback function definition
def apcCallback(imgNr, userData):
s.DrawBuffer(userData.displayid, s.Fg_getImagePtrEx(userData.fg, imgNr, userData.port, userData.mem), imgNr, "")
return 0
# MAIN
# Board and applet selection
boardId = 0
if boardId < 0:
exit(1)
# definition of resolution
width = 512
height = 512
samplePerPixel = 1
bytePerSample = 1
isSlave = False
useCameraSimulator = True
camPort = s.PORT_A
# number of buffers for acquisition
nbBuffers = 10
totalBufferSize = width * height * samplePerPixel * bytePerSample * nbBuffers
# number of image to acquire
nrOfPicturesToGrab = 10
frameRate = 100
# Get Loaded Applet
applet = "My_Applet.hap"
if applet == None:
exit(0)
# INIT FRAMEGRABBER
print('Initializing Board ..', end='')
if isSlave:
fg = s.Fg_InitEx(applet, boardId, 1);
else:
fg = s.Fg_InitEx(applet, boardId, 0);
# error handling
err = s.Fg_getLastErrorNumber(fg)
mes = s.Fg_getErrorDescription(err)
if err < 0:
print("Error", err, ":", mes)
sys.exit()
else:
print("ok")
# allocating memory
memHandle = s.Fg_AllocMemEx(fg, totalBufferSize, nbBuffers)
# Set Applet Parameters
err = s.Fg_setParameterWithInt(fg, s.FG_WIDTH, width, camPort)
if (err < 0):
print("Fg_setParameter(FG_WIDTH) failed: ", s.Fg_getLastErrorDescription(fg))
s.Fg_FreeMemEx(fg, memHandle)
s.Fg_FreeGrabber(fg)
exit(err)
err = s.Fg_setParameterWithInt(fg, s.FG_HEIGHT, height, camPort)
if (err < 0):
print("Fg_setParameter(FG_HEIGHT) failed: ", s.Fg_getLastErrorDescription(fg))
s.Fg_FreeMemEx(fg, memHandle)
s.Fg_FreeGrabber(fg)
exit(err)
err = s.Fg_setParameterWithInt(fg, s.FG_BITALIGNMENT, s.FG_LEFT_ALIGNED, camPort)
if (err < 0):
print("Fg_setParameter(FG_BITALIGNMENT) failed: ", s.Fg_getLastErrorDescription(fg))
#s.Fg_FreeMemEx(fg, memHandle)
#s.Fg_FreeGrabber(fg)
#exit(err)
if useCameraSimulator:
# Start Generator
s.Fg_setParameterWithInt(fg, s.FG_GEN_ENABLE, s.FG_GENERATOR, camPort)
# s.Fg_setParameterWithInt(fg, s.FG_GEN_ROLL, 1, camPort)
else:
s.Fg_setParameterWithInt(fg, s.FG_GEN_ENABLE, s.FG_CAMPORT, camPort)
# Read back settings
(err, oWidth) = s.Fg_getParameterWithInt(fg, s.FG_WIDTH, camPort)
if (err == 0):
print('Width =', oWidth)
(err, oHeight) = s.Fg_getParameterWithInt(fg, s.FG_HEIGHT, camPort)
if (err == 0):
print('Height =', oHeight)
(err, oString) = s.Fg_getParameterWithString(fg, s.FG_HAP_FILE, camPort)
if (err == 0):
print('Hap File =', oString)
# create a display window
dispId0 = s.CreateDisplay(8 * bytePerSample * samplePerPixel, width, height)
s.SetBufferWidth(dispId0, width, height)
# Register acquisition call back
#Define FgApcControl instance to handle the callback
apcCtrl = s.FgApcControl(5, s.FG_APC_DEFAULTS)
data = MyApcData(fg, camPort, memHandle, dispId0)
s.setApcCallbackFunction(apcCtrl, apcCallback, data)
#Register the FgApcControl instance to the Fg_Struct instance
err = s.Fg_registerApcHandler(fg, camPort, apcCtrl, s.FG_APC_CONTROL_BASIC)
if err != s.FG_OK:
print("registering APC handler failed:", s.Fg_getErrorDescription(err))
s.Fg_FreeMemEx(fg, memHandle)
s.CloseDisplay(dispId0)
s.Fg_FreeGrabber(fg)
exit(err)
# Start acquisition
print("Acquisition started")
err = s.Fg_AcquireEx(fg, camPort, nrOfPicturesToGrab, s.ACQ_STANDARD, memHandle)
if (err != 0):
print('Fg_AcquireEx() failed:', s.Fg_getLastErrorDescription(fg))
s.Fg_FreeMemEx(fg, memHandle)
s.CloseDisplay(dispId0)
s.Fg_FreeGrabber(fg)
exit(err)
time.sleep(5);
s.CloseDisplay(dispId0)
print("Acquisition stopped")
# Clean up
if (fg != None):
s.Fg_registerApcHandler(fg, camPort, None, s.FG_APC_CONTROL_BASIC);
s.Fg_stopAcquire(fg, camPort)
s.Fg_FreeMemEx(fg, memHandle)
s.Fg_FreeGrabber(fg)
print("Exited.")

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