diff --git a/resources/ne_s3.h b/resources/ne_s3.h
new file mode 100644
index 0000000..f4b4c33
--- /dev/null
+++ b/resources/ne_s3.h
@@ -0,0 +1,76 @@
+extern "C" {
+#ifdef _WIN32
+#define NE_S3_IMPORT __declspec(dllimport)
+#else
+#define NE_S3_IMPORT
+#endif
+/// The callback function when upload/download finished
+/// # Arguments
+/// - `success` - Whether upload/download success
+/// - `message` - The message of upload/download
+/// - `user_data` - The user data passed to upload/download function
+typedef void (*result_callback)(bool success,
+                                const char* message,
+                                const char* user_data);
+
+/// The callback function when upload/download progress changed
+/// # Arguments
+/// - `progress` - The progress of upload/download
+/// - `user_data` - The user data passed to upload/download function
+typedef void (*progress_callback)(float progress, const char* user_data);
+
+/// init sdk
+/// run this function before any other functions
+/// # Arguments
+/// - `params` - The params of init, in json format
+///     - `log_path` - The log path, use stdout if not given
+NE_S3_IMPORT void __cdecl ne_s3_init(const char* params);
+
+/// uninit sdk
+/// run this function to shutdown
+NE_S3_IMPORT void __cdecl ne_s3_uninit();
+
+/// Upload file to s3
+/// # Arguments
+/// - `params` - The params of upload, json format
+///     - `bucket` - The bucket name
+///     - `object` - The object key
+///     - `access_key_id` - The access key id
+///     - `secret_access_key` - The secret access key
+///     - `session_token` - The session token
+///     - `security_token` - The security token
+///     - `file_path` - The file path
+///     - `region` - The region
+///     - `tries` - The max retry times
+///     - `endpoint` - The endpoint, use default if not set
+///     - `ca_cert_path` - The ca certs path, use system certs if not set
+/// - `result_callback` - The callback function when upload finished
+/// - `progress_callback` - The callback function when upload progress changed
+/// - `user_data` - The user data, will be passed to callbacks, lifetime must be
+///                 longer than callbacks
+NE_S3_IMPORT void __cdecl ne_s3_upload(const char* params,
+                                       result_callback result,
+                                       progress_callback progress,
+                                       const char* user_data);
+
+/// download file from s3
+/// # Arguments
+/// - `params` - The params of download, json format
+///     - `bucket` - The bucket name
+///     - `object` - The object key
+///     - `access_key_id` - The access key id
+///     - `secret_access_key` - The secret access key
+///     - `session_token` - The session token
+///     - `security_token` - The security token
+///     - `file_path` - The file path
+///     - `region` - The region
+///     - `tries` - The max retry times
+///     - `endpoint` - The endpoint, use default if not set
+///     - `ca_cert_path` - The ca certs path, use system certs if not set
+/// - `result_callback` - The callback function when download finished
+/// - `user_data` - The user data, will be passed to callbacks, lifetime must be
+///                 longer than callbacks
+NE_S3_IMPORT void __cdecl ne_s3_download(const char* params,
+                                         result_callback result,
+                                         const char* user_data);
+}
\ No newline at end of file
diff --git a/src/basic.rs b/src/basic.rs
index cdeb3b9..2b6d1a1 100644
--- a/src/basic.rs
+++ b/src/basic.rs
@@ -16,8 +16,14 @@ use std::{
     task::{Context, Poll},
 };
 
+/// result callback
+/// - `success` - true if success, false if failed
+/// - `message` - error message if failed
 pub type ResultCallback = Box<dyn Fn(bool, String) + Send + Sync>;
-pub type ProgressCallback = Arc<Mutex<dyn Fn(f64) + Send + Sync>>;
+
+/// progress callback
+/// - `progress` - progress of upload or download, in percentage
+pub type ProgressCallback = Arc<Mutex<dyn Fn(f32) + Send + Sync>>;
 
 #[derive(Debug)]
 pub struct NeS3Credential {
@@ -68,7 +74,7 @@ impl ProgressTracker {
     fn track(&mut self, len: u64) {
         let mut bytes_written = self.bytes_written.lock().unwrap();
         *bytes_written += len;
-        let progress = *bytes_written as f64 / self.content_length as f64 * 100.0;
+        let progress = *bytes_written as f32 / self.content_length as f32 * 100.0;
         let progress_callback = self.progress_callback.lock().unwrap();
         if std::time::Instant::now() - self.last_callback_time
             < std::time::Duration::from_millis(500)
@@ -159,12 +165,12 @@ pub struct S3Params {
     pub(crate) access_key_id: String,
     pub(crate) secret_access_key: String,
     pub(crate) session_token: String,
-    pub(crate) file_path: String,
     pub(crate) security_token: String,
-    pub(crate) ca_certs_path: Option<String>,
+    pub(crate) file_path: String,
     pub(crate) region: Option<String>,
     pub(crate) tries: Option<u32>,
     pub(crate) endpoint: Option<String>,
+    pub(crate) ca_cert_path: Option<String>,
 }
 
 fn load_ca_cert(path: &String) -> Result<RootCertStore, Box<dyn std::error::Error>> {
@@ -193,12 +199,12 @@ pub fn create_s3_client(params: &S3Params) -> Result<Client, Box<dyn std::error:
         // Set max attempts.
         // If tries is 1, there are no retries.
         .retry_config(RetryConfig::standard().with_max_attempts(params.tries.unwrap_or(1)));
-    if params.ca_certs_path.is_some() {
+    if params.ca_cert_path.is_some() {
         info!(
             "use custom ca certs, path: {}",
-            params.ca_certs_path.as_ref().unwrap()
+            params.ca_cert_path.as_ref().unwrap()
         );
-        let root_store = load_ca_cert(params.ca_certs_path.as_ref().unwrap())?;
+        let root_store = load_ca_cert(params.ca_cert_path.as_ref().unwrap())?;
         let config = rustls::ClientConfig::builder()
             .with_safe_defaults()
             .with_root_certificates(root_store)
diff --git a/src/lib.rs b/src/lib.rs
index 67c4706..23f4d05 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -3,7 +3,7 @@ use flexi_logger::{with_thread, Age, Cleanup, Criterion, FileSpec, Logger, Namin
 use log::{error, info};
 use serde::{Deserialize, Serialize};
 use serde_json::json;
-use std::{sync::Mutex, path::Path};
+use std::{sync::{Mutex, Arc}, path::Path};
 use sysinfo::System;
 use urlencoding::decode;
 pub use basic::S3Params;
@@ -17,23 +17,23 @@ struct InitParams {
 }
 
 static mut RUNTIME: Mutex<Option<tokio::runtime::Runtime>> = Mutex::new(None);
-/// init tokio runtime
+/// init sdk
 /// run this function before any other functions
 /// # Arguments
 /// - `params` - The params of init, json format
 ///     - `log_path` - The log path, use stdout if not set
-pub fn init(params_str: String) {
+pub fn init(params: String) {
     let mut runtime = unsafe { RUNTIME.lock().unwrap() };
     if !runtime.is_none() {
         return;
     }
-    let params = match serde_json::from_str::<InitParams>(&params_str) {
-        Ok(params) => params,
+    let parsed_params = match serde_json::from_str::<InitParams>(&params) {
+        Ok(result) => result,
         Err(err) => {
             panic!("parse init params failed: {}", err);
         }
     };
-    let log_path = params.log_path.as_ref();
+    let log_path = parsed_params.log_path.as_ref();
     if log_path.is_some_and(|path| Path::new(path).exists()) {
         let log_path = log_path.unwrap();
         let _logger = Logger::try_with_str("info")
@@ -55,7 +55,7 @@ pub fn init(params_str: String) {
             .start()
             .unwrap();
     }
-    info!("init params: {}", params_str);
+    info!("init params: {}", params);
     let mut system_info = System::new_all();
     system_info.refresh_all();
     let system_info_json = json!({
@@ -74,8 +74,14 @@ pub fn init(params_str: String) {
         .unwrap();
     *runtime = Some(rt);
 }
+#[no_mangle]
+pub extern "cdecl" fn ne_s3_init(params: *const std::os::raw::c_char) {
+    let params = unsafe { std::ffi::CStr::from_ptr(params) };
+    let params = params.to_str().unwrap();
+    init(params.to_string());
+}
 
-/// uninit tokio runtime
+/// uninit sdk
 /// run this function to shutdown
 pub fn uninit() {
     let mut runtime = unsafe { RUNTIME.lock().unwrap() };
@@ -86,6 +92,10 @@ pub fn uninit() {
         rt.shutdown_background();
     }
 }
+#[no_mangle]
+pub extern "cdecl" fn ne_s3_uninit() {
+    uninit();
+}
 
 /// Upload file to s3
 /// # Arguments
@@ -94,16 +104,15 @@ pub fn uninit() {
 ///     - `object` - The object key
 ///     - `access_key_id` - The access key id
 ///     - `secret_access_key` - The secret access key
-///     - `file_path` - The file path
+///     - `session_token` - The session token
 ///     - `security_token` - The security token
+///     - `file_path` - The file path
 ///     - `region` - The region
 ///     - `tries` - The max retry times
 ///     - `endpoint` - The endpoint, use default if not set
+///     - `ca_cert_path` - The ca certs path, use system certs if not set
 /// - `result_callback` - The callback function when upload finished
-///     - `success` - The upload succeeded or not
-///     - `message` - The error message if upload failed
 /// - `progress_callback` - The callback function when upload progress changed
-///     - `progress` - The progress of upload, in percentage
 pub fn upload(
     params: String,
     result_callback: basic::ResultCallback,
@@ -147,6 +156,25 @@ pub fn upload(
         }
     });
 }
+#[no_mangle]
+pub extern "cdecl" fn ne_s3_upload(
+    params: *const std::os::raw::c_char,
+    result_callback: extern "C" fn(success: bool, message: *const std::os::raw::c_char, user_data: *const std::os::raw::c_char),
+    progress_callback: extern "C" fn(progress: f32, user_data: *const std::os::raw::c_char),
+    user_data: *const std::os::raw::c_char,
+) {
+    let params = unsafe { std::ffi::CStr::from_ptr(params as *mut _) };
+    let params = params.to_str().unwrap().to_string();
+    let user_data = unsafe { std::ffi::CStr::from_ptr(user_data) };
+    let result_callback = move |success: bool, message: String| {
+        let message = std::ffi::CString::new(message).unwrap();
+        result_callback(success, message.as_ptr(), user_data.as_ptr());
+    };
+    let progress_callback = move |progress: f32| {
+        progress_callback(progress, user_data.as_ptr());
+    };
+    upload(params.to_string(), Box::new(result_callback), Arc::new(Mutex::new(progress_callback)));
+}
 
 /// download file from s3
 /// # Arguments
@@ -155,14 +183,14 @@ pub fn upload(
 ///     - `object` - The object key
 ///     - `access_key_id` - The access key id
 ///     - `secret_access_key` - The secret access key
-///     - `file_path` - The file path
+///     - `session_token` - The session token
 ///     - `security_token` - The security token
+///     - `file_path` - The file path
 ///     - `region` - The region
 ///     - `tries` - The max retry times
 ///     - `endpoint` - The endpoint, use default if not set
+///     - `ca_cert_path` - The ca certs path, use system certs if not set
 /// - `result_callback` - The callback function when download finished
-///     - `success` - The download succeeded or not
-///     - `message` - The error message if download failed
 pub fn download(params: String, result_callback: basic::ResultCallback) {
     info!("download params: {}", params);
     let runtime = unsafe { RUNTIME.lock().unwrap() };
@@ -201,4 +229,19 @@ pub fn download(params: String, result_callback: basic::ResultCallback) {
             result_callback(false, error_descrption);
         }
     });
+}
+#[no_mangle]
+pub extern "cdecl" fn ne_s3_download(
+    params: *const std::os::raw::c_char,
+    result_callback: extern "C" fn(success: bool, message: *const std::os::raw::c_char, user_data: *const std::os::raw::c_char),
+    user_data: *const std::os::raw::c_char,
+) {
+    let params = unsafe { std::ffi::CStr::from_ptr(params as *mut _) };
+    let params = params.to_str().unwrap().to_string();
+    let user_data = unsafe { std::ffi::CStr::from_ptr(user_data) };
+    let result_callback = move |success: bool, message: String| {
+        let message = std::ffi::CString::new(message).unwrap();
+        result_callback(success, message.as_ptr(), user_data.as_ptr());
+    };
+    download(params.to_string(), Box::new(result_callback));
 }
\ No newline at end of file
diff --git a/src/main.rs b/src/main.rs
index 1528328..cb9e866 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -24,7 +24,7 @@ struct Args {
     #[arg(long)]
     security_token: String,
     #[arg(long, default_value_t = String::new())]
-    ca_certs_path: String,
+    ca_cert_path: String,
     #[arg(long, default_value_t = String::new())]
     region: String,
     #[arg(long, default_value_t = 3)]
@@ -58,7 +58,7 @@ fn main() {
                 *lock = true;
                 ccond.notify_one();
             };
-            let progress_callback = |progress: f64| {
+            let progress_callback = |progress: f32| {
                 info!("put object progress: {:.2}%", progress);
             };
             upload(