- 1 year ago
How do I allocate space to call GetInterfaceInfo using the windows crate?
To allocate space for calling the GetInterfaceInfo
function using the windows
crate in Rust, you can use the alloc_zeroed
function from the winapi
crate to allocate memory for the required structures.
Here's an example code snippet that demonstrates how to allocate the necessary memory and call the GetInterfaceInfo
function:
rustuse std::mem;
use winapi::shared::ifdef::{IP_INTERFACE_INFO, IP_INTERFACE_NAME_INFO};
use winapi::um::iphlpapi::{GetInterfaceInfo, GetInterfaceInfoPtr};
fn main() {
unsafe {
// Allocate memory for the IP_INTERFACE_INFO structure
let mut interface_info: IP_INTERFACE_INFO = mem::zeroed();
let interface_info_size = mem::size_of::<IP_INTERFACE_INFO>() as u32;
// Call GetInterfaceInfo with a null pointer to get the required buffer size
let mut buffer_size: u32 = 0;
GetInterfaceInfoPtr(&mut interface_info, &mut buffer_size);
// Allocate memory for the actual IP_INTERFACE_INFO structure
let buffer = vec![0u8; buffer_size as usize];
// Call GetInterfaceInfo again with the allocated buffer
GetInterfaceInfo(
&mut interface_info as *mut _,
&mut buffer_size,
);
// Access the interface information from the IP_INTERFACE_INFO structure
let interface_count = interface_info.NumAdapters as usize;
let interface_names = &interface_info.Adapter[0..interface_count];
// Iterate over the interface names and print them
for interface_name in interface_names {
let name = &interface_name.Name;
let len = name.len() as usize;
let name_string = String::from_utf8_lossy(&name[0..len]);
println!("Interface Name: {}", name_string);
}
}
}
This code allocates memory for the IP_INTERFACE_INFO
structure, calls GetInterfaceInfo
twice to determine the required buffer size and retrieve the interface information, and then iterates over the interface names and prints them.
Make sure to include the necessary dependencies in your Cargo.toml
file:
toml[dependencies]
winapi = "0.3.9"
Note that working with the windows
crate and interacting with the Win32 API in Rust requires understanding of unsafe Rust and proper handling of unsafe operations. It's important to carefully review and understand the documentation and behavior of the Win32 API functions you're using to ensure correct and safe usage in your code.