move vm_path and dll loading into cdll.py

define binds explicitly in Binds.

bump to version 0.3

addon/globalPlugins/voicemeeter/cdll.py

@@ -0,0 +1,49 @@
+import ctypes as ct
+import platform
+import winreg
+from pathlib import Path
+
+from .error import VMError
+
+BITS = 64 if ct.sizeof(ct.c_voidp) == 8 else 32
+
+if platform.system() != "Windows":
+    raise VMError("Only Windows OS supported")
+
+
+VM_KEY = "VB:Voicemeeter {17359A74-1236-5467}"
+REG_KEY = "\\".join(
+    filter(
+        None,
+        (
+            "SOFTWARE",
+            "WOW6432Node" if BITS == 64 else "",
+            "Microsoft",
+            "Windows",
+            "CurrentVersion",
+            "Uninstall",
+        ),
+    )
+)
+
+
+def get_vmpath():
+    with winreg.OpenKey(winreg.HKEY_LOCAL_MACHINE, r"{}".format("\\".join((REG_KEY, VM_KEY)))) as vm_key:
+        return winreg.QueryValueEx(vm_key, r"UninstallString")[0]
+
+
+try:
+    vm_parent = Path(get_vmpath()).parent
+except FileNotFoundError as e:
+    raise VMError(f"Unable to fetch DLL path from the registry") from e
+
+DLL_NAME = f'VoicemeeterRemote{"64" if BITS == 64 else ""}.dll'
+
+dll_path = vm_parent.joinpath(DLL_NAME)
+if not dll_path.is_file():
+    raise VMError(f"Could not find {dll_path}")
+
+if BITS == 64:
+    libc = ct.CDLL(str(dll_path))
+else:
+    libc = ct.WinDLL(str(dll_path))