Question

I am programing VIX API from python 2.5, but now I want to port the code to python 3.2

This function opens the virtual machine:

self.jobHandle = self.VixLib.vix.VixVM_Open(self.hostHandle,
                                            "C:\\MyVirtualMachine.vmx", None, None)

Previusly this function is imported from Vix.dll with this code:

vix.VixVM_Open.restype = VixHandle
vix.VixVM_Open.argtypes = [VixHandle,c_char_p,POINTER(VixEventProc),c_void_p]

In 2.5 this code is correct, but in 3.2 it returns ctypes.ArgumentError

What can I do?

Answer 1

Your second argument has to be encoded to a format that the VIX API will understand, since Python 3.x now creates all strings as Unicode. The simplest approach would be to modify your second argument to read:

"C:\\MyVirtualMachine.vmx".encode('ascii','ignore')

which should give you a variable of type bytes, which should be more palatable to VIX.