Python Script To Read And Write A Path To Registry

I have developed a python script where i have a setting window which has the options to select the paths for the installation of software.When clicked on OK button of the setting w

Solution 1:

#Python3 version of hugo24's snippet
import winreg

REG_PATH = r"Control Panel\Mouse"

def set_reg(name, value):
    try:
        winreg.CreateKey(winreg.HKEY_CURRENT_USER, REG_PATH)
        registry_key = winreg.OpenKey(winreg.HKEY_CURRENT_USER, REG_PATH, 0, 
                                       winreg.KEY_WRITE)
        winreg.SetValueEx(registry_key, name, 0, winreg.REG_SZ, value)
        winreg.CloseKey(registry_key)
        return True
    except WindowsError:
        return False

def get_reg(name):
    try:
        registry_key = winreg.OpenKey(winreg.HKEY_CURRENT_USER, REG_PATH, 0,
                                       winreg.KEY_READ)
        value, regtype = winreg.QueryValueEx(registry_key, name)
        winreg.CloseKey(registry_key)
        return value
    except WindowsError:
        return None

#Example MouseSensitivity
#Read value 
print (get_reg('MouseSensitivity'))

#Set Value 1/20 (will just write the value to reg, the changed mouse val requires a win re-log to apply*)
set_reg('MouseSensitivity', str(10))

#*For instant apply of SystemParameters like the mouse speed on-write, you can use win32gui/SPI
#http://docs.activestate.com/activepython/3.4/pywin32/win32gui__SystemParametersInfo_meth.html

Solution 2:

Same as @Aramanethota but with pep8 and func def for easy usage.

REG_PATH = r"SOFTWARE\my_program\Settings"

def set_reg(name, value):
    try:
        _winreg.CreateKey(_winreg.HKEY_CURRENT_USER, REG_PATH)
        registry_key = _winreg.OpenKey(_winreg.HKEY_CURRENT_USER, REG_PATH, 0, 
                                       _winreg.KEY_WRITE)
        _winreg.SetValueEx(registry_key, name, 0, _winreg.REG_SZ, value)
        _winreg.CloseKey(registry_key)
        return True
    except WindowsError:
        return False

def get_reg(name):
    try:
        registry_key = _winreg.OpenKey(_winreg.HKEY_CURRENT_USER, REG_PATH, 0,
                                       _winreg.KEY_READ)
        value, regtype = _winreg.QueryValueEx(registry_key, name)
        _winreg.CloseKey(registry_key)
        return value
    except WindowsError:
        return None

Solution 3:

Python script to read from registry is as follows:

try:
    root_key=OpenKey(HKEY_CURRENT_USER, r'SOFTWARE\my path to\Registry', 0, KEY_READ)
    [Pathname,regtype]=(QueryValueEx(root_key,"Pathname"))
    CloseKey(root_key)
    if (""==Pathname):
        raise WindowsError
except WindowsError:
    return [""]

Python script to write to the registry is:

try:
    keyval=r"SOFTWARE\my path to\Registry"
    if not os.path.exists("keyval"):
        key = CreateKey(HKEY_CURRENT_USER,keyval)
    Registrykey= OpenKey(HKEY_CURRENT_USER, r"SOFTWARE\my path to\Registry", 0,KEY_WRITE)
    SetValueEx(Registrykey,"Pathname",0,REG_SZ,Pathname)
    CloseKey(Registrykey)
    return True
except WindowsError:
    return False

Hope it helps you all.Cheers:)

Solution 4:

Reading registry keys:

def read(path, root=HKEY_CURRENT_USER):
    path, name = os.path.split(path)
    with suppress(FileNotFoundError), OpenKey(root, path) as key:
        return QueryValueEx(key, name)[0]

And writing:

def write(path, value, root=HKEY_CURRENT_USER):
    path, name = os.path.split(path)
    with OpenKey(root, path, 0, KEY_WRITE) as key:
        SetValueEx(key, name, 0, REG_SZ, value)

Extended for type handling. Provide type as argument, match current type in registry or python value type.

def write(path, value, root=HKEY_CURRENT_USER, regtype=None):
    path, name = os.path.split(path)
    with OpenKey(root, path, 0, KEY_WRITE|KEY_READ) as key:
        with suppress(FileNotFoundError):
            regtype = regtype or QueryValueEx(key, name)[1]

        SetValueEx(key, name, 0, regtype or REG_DWORD if isinstance(value, int) else REG_SZ, str(value) if regtype==REG_SZ else value)

NOTE: Use of contextlib.suppress() (available since python 3.4) can be replaced by try..except..pass for older versions. The context manager interface for winreg was introduced in python 2.6.

Solution 5:

Looks like you don't have permission to edit the Registry. Incase if you are Admin, Please run this script in Elevated state.