Implement libmeterfeeder over libqwqng for multiple device support

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Author: Simon Nishi McCorkindale

libmeterfeeder.dylib

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+##
+ # MeterFeeder Library Wrapper
+ # 
+ # by soliax
+ ##
+ 
+from platform import os
+from sys import platform
+from ctypes import *
+
+cdll = LibraryLoader(CDLL)
+
+class MeterFeederWrapper:
+
+    def __init__(self):
+        if platform == "linux" or platform == "linux2":
+            # Linux
+            self._meterfeeder = cdll.LoadLibrary(os.getcwd() + '/libmeterfeeder.so')
+        elif platform == "darwin":
+            # OS X
+            self._meterfeeder = cdll.LoadLibrary(os.getcwd() + '/libmeterfeeder.dylib')
+        elif platform == "win32":
+            # Windows
+            self._meterfeeder = cdll.LoadLibrary(os.getcwd() + '/meterfeeder.dll')
+
+        # Declare function bridging
+        self._meterfeeder.MF_Initialize.argtypes = c_char_p,
+        self._meterfeeder.MF_Initialize.restype = c_int
+        
+        self._meterfeeder.MF_GetNumberGenerators.restype = c_int
+
+        self._meterfeeder.MF_GetListGenerators.argtypes = [POINTER(c_char_p)]
+
+        self._meterfeeder.MF_GetBytes.argtypes = c_int, POINTER(c_ubyte), c_char_p, c_char_p,
+
+        self._meterfeeder.MF_RandInt32.argtypes = c_char_p, c_char_p,
+        self._meterfeeder.MF_RandInt32.restype = c_int
+
+        self._meterfeeder.MF_RandUniform.argtypes = c_char_p, c_char_p,
+        self._meterfeeder.MF_RandUniform.restype = c_double
+
+        self._meterfeeder.MF_RandNormal.argtypes = c_char_p, c_char_p,
+        self._meterfeeder.MF_RandNormal.restype = c_double
+
+        self._meterfeeder.MF_Clear.argtypes = c_char_p, c_char_p,
+        self._meterfeeder.MF_Clear.restype = c_bool
+
+        self._meterfeeder.MF_Reset.argtypes = c_char_p,
+        self._meterfeeder.MF_Reset.restype = c_int
+
+        self._medErrorReason = create_string_buffer(256)
+
+        # Initialize Meter Feeder
+        result = self._meterfeeder.MF_Initialize(self._medErrorReason)
+        if (len(self._medErrorReason.value) > 0):
+            print(self._medErrorReason)
+            exit(result)
+
+    def deviceIds(self, returnAsList):
+        # Get the list of connected devices
+        numGenerators = self._meterfeeder.MF_GetNumberGenerators()
+        generatorsListBuffers = [create_string_buffer(58) for i in range(numGenerators)]
+        generatorsListBufferPointers = (c_char_p*numGenerators)(*map(addressof, generatorsListBuffers))
+        self._meterfeeder.MF_GetListGenerators(generatorsListBufferPointers)
+        generatorsList = [str(s.value, 'utf-8') for s in generatorsListBuffers]
+        
+        if returnAsList:
+            return generatorsList
+
+        deviceIdsCsvList = ""
+        for i in range(numGenerators):
+            if i < numGenerators - 1:
+                deviceIdsCsvList += generatorsList[i].split("|")[0] + ","
+            else:
+                deviceIdsCsvList += generatorsList[i].split("|")[0]
+        return deviceIdsCsvList
+
+    def randint32(self, deviceId):
+        try:
+            return self._meterfeeder.MF_RandInt32(deviceId.encode("utf-8"), self._medErrorReason)
+        except:
+            self._meterfeeder.MF_Reset()
+            return self._meterfeeder.MF_RandInt32(deviceId.encode("utf-8"), self._medErrorReason)
+
+    def randuniform(self, deviceId):
+        try:
+            return self._meterfeeder.MF_RandUniform(deviceId.encode("utf-8"), self._medErrorReason)
+        except:
+            self._meterfeeder.MF_Reset()
+            return self._meterfeeder.MF_RandUniform(deviceId.encode("utf-8"), self._medErrorReason)
+
+    def randnormal(self, deviceId):
+        try:
+            return self._meterfeeder.MF_RandNormal(deviceId.encode("utf-8"), self._medErrorReason)
+        except:
+            self._meterfeeder.MF_Reset()
+            return self._meterfeeder.MF_RandNormal(deviceId.encode("utf-8"), self._medErrorReason)
+
+    def randbytes(self, deviceId, length):
+        barray = bytearray(length)
+        ubuffer = (c_ubyte * length).from_buffer(barray)
+        try:
+            self._meterfeeder.MF_GetBytes(length, ubuffer, deviceId.encode("utf-8"), self._medErrorReason)
+            return barray
+        except:
+            self._meterfeeder.MF_Reset()
+            self._meterfeeder.MF_GetBytes(length, ubuffer, deviceId.encode("utf-8"), self._medErrorReason)
+            return barray
+
+    def clear(self, deviceId):
+        if self._meterfeeder.MF_Clear(deviceId.encode("utf-8"), self._medErrorReason) == False:
+            print("unable to clear", deviceId, ": ", self._medErrorReason.value)
+
+    def reset(self):
+        result = self._meterfeeder.MF_Reset(self._medErrorReason)
+        if (len(self._medErrorReason.value) > 0):
+            print(self._medErrorReason)
+            exit(result)
+
+    def status(self):
+        return "ONLINE"