COM definitions for the undocumented IPolicyConfig interface. This interface can be used to change to the default audio device on windows.
This is a manual port of PolicyConfig.h.
More additional resources:
Important: It is possible I made a mistake during the port or messed up some type. Take everything with a grain of salt.
use windows::core::{PCWSTR, Result};
use windows::Win32::Devices::FunctionDiscovery::PKEY_Device_FriendlyName;
use windows::Win32::Media::Audio::{DEVICE_STATE_ACTIVE, eConsole, eRender, IMMDeviceEnumerator, MMDeviceEnumerator};
use windows::Win32::System::Com::{CLSCTX_ALL, CoCreateInstance, COINIT_MULTITHREADED, CoInitializeEx, CoUninitialize, STGM_READ};
use com_policy_config::{IPolicyConfig, PolicyConfigClient};
fn main() -> Result<()>{
unsafe {
CoInitializeEx(None, COINIT_MULTITHREADED)?;
let enumerator: IMMDeviceEnumerator = CoCreateInstance(&MMDeviceEnumerator, None, CLSCTX_ALL)?;
println!("All Devices:");
let device_collection = enumerator.EnumAudioEndpoints(eRender, DEVICE_STATE_ACTIVE)?;
for i in 0..device_collection.GetCount()? {
let device = device_collection.Item(i)?;
let property_store = device.OpenPropertyStore(STGM_READ)?;
let name = property_store.GetValue(&PKEY_Device_FriendlyName)?;
println!(" {}", name.Anonymous.Anonymous.Anonymous.pwszVal.display());
}
let selected_device = device_collection.Item(0)?;
let property_store = selected_device.OpenPropertyStore(STGM_READ)?;
let name = property_store.GetValue(&PKEY_Device_FriendlyName)?;
println!("Selected Device: {}", name.Anonymous.Anonymous.Anonymous.pwszVal.display());
let device_id = PCWSTR(selected_device.GetId()?.0);
let policy_config: IPolicyConfig = CoCreateInstance(&PolicyConfigClient, None, CLSCTX_ALL)?;
policy_config.SetDefaultEndpoint(&device_id, eConsole)?;
CoUninitialize();
}
Ok(())
}MIT License