diff --git a/.cargo/config b/.cargo/config
index ccc4a6c..3a249ae 100644
--- a/.cargo/config
+++ b/.cargo/config
@@ -1,2 +1,2 @@
 [build]
-target = "x86_64-pc-windows-msvc"
\ No newline at end of file
+target = "i686-pc-windows-msvc"
\ No newline at end of file
diff --git a/Cargo.toml b/Cargo.toml
index 79c8103..e11ba31 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "injrs"
-version = "0.1.1"
+version = "0.1.2"
 description = "DLL injector library and tool written in Rust. Rust 实现的DLL注入工具/库。"
 authors = ["Zoe <hi@zoe.im>"]
 license = "Apache-2.0"
@@ -8,6 +8,9 @@ edition = "2018"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
+[[example]]
+name = "hellobox"
+crate-type = ["cdylib"]
 
 
 [dependencies.winapi]
@@ -16,6 +19,7 @@ features = [
     "memoryapi",
     "minwindef",
     "ntdef", 
+    "winuser",
     "tlhelp32",
     "psapi", 
     "securitybaseapi",
diff --git a/README.md b/README.md
index 6fd9c10..b8f74fd 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,7 @@
 <div align="center">
 
+<img alt="Hello Box Demo" src="./hello-box-demo.png" width="100">
+
 # `injrs`
 
 **DLL injector library and tool written in Rust. Rust 实现的DLL注入工具/库**
@@ -42,7 +44,24 @@ EXAMPLES:
     $ injrs 1888 test.dll demo.dll
 ```
 
-The code in [example](./example) is a simple message box dll for testing injector.
+## DLL Demo
+
+The code in [examples/hellobox](./examples/hellobox) is a simple message box dll for testing injector.
+
+You can build with command:
+```bash
+cargo build --release --example hellobox
+```
+
+Build target will locate in:
+```bash
+target/i686-pc-windows-msvc/release/examples/hellobox.dll
+```
+
+Try to inject the demo dll to your target process:
+```bash
+injrs PID/PNAME target/i686-pc-windows-msvc/release/examples/hellobox.dll
+```
 
 ## Usage as library
 
diff --git a/example/.cargo/config b/example/.cargo/config
deleted file mode 100644
index ccc4a6c..0000000
--- a/example/.cargo/config
+++ /dev/null
@@ -1,2 +0,0 @@
-[build]
-target = "x86_64-pc-windows-msvc"
\ No newline at end of file
diff --git a/example/Cargo.toml b/example/Cargo.toml
deleted file mode 100644
index 49a768d..0000000
--- a/example/Cargo.toml
+++ /dev/null
@@ -1,13 +0,0 @@
-[package]
-name = "example"
-version = "0.1.0"
-edition = "2018"
-
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
-
-[lib]
-crate-type = ["cdylib"]
-
-[dependencies]
-winapi = { version = "0.3.9", features = [ "minwindef", "winnt", "libloaderapi", "winuser" ] }
-
diff --git a/example/src/lib.rs b/examples/hellobox.rs
similarity index 92%
rename from example/src/lib.rs
rename to examples/hellobox.rs
index 6e734a1..569c93a 100644
--- a/example/src/lib.rs
+++ b/examples/hellobox.rs
@@ -33,7 +33,7 @@ fn show_message_box(caption: &str, text: &str) {
 // define dllmain to handle the init action
 #[no_mangle]
 #[allow(non_snake_case)]
-pub extern "stdcall" fn DllMain(hinst: HINSTANCE, reason: DWORD, _reserved: LPVOID) -> BOOL {
+unsafe extern "system" fn DllMain(hinst: HINSTANCE, reason: DWORD, _reserved: LPVOID) -> BOOL {
   match reason {
     DLL_PROCESS_DETACH => {
       println!("Remove from main process.");
diff --git a/hello-box-demo.png b/hello-box-demo.png
new file mode 100644
index 0000000..c478550
Binary files /dev/null and b/hello-box-demo.png differ