Initial commit

.gitignore

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+/target
+/.idea

Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "rust_dll"
+version = "0.1.0"
+dependencies = [
+ "windows",
+]
+
+[[package]]
+name = "windows"
+version = "0.54.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9252e5725dbed82865af151df558e754e4a3c2c30818359eb17465f1346a1b49"
+dependencies = [
+ "windows-core",
+ "windows-targets",
+]
+
+[[package]]
+name = "windows-core"
+version = "0.54.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "12661b9c89351d684a50a8a643ce5f608e20243b9fb84687800163429f161d65"
+dependencies = [
+ "windows-result",
+ "windows-targets",
+]
+
+[[package]]
+name = "windows-result"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cd19df78e5168dfb0aedc343d1d1b8d422ab2db6756d2dc3fef75035402a3f64"
+dependencies = [
+ "windows-targets",
+]
+
+[[package]]
+name = "windows-targets"
+version = "0.52.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7dd37b7e5ab9018759f893a1952c9420d060016fc19a472b4bb20d1bdd694d1b"
+dependencies = [
+ "windows_aarch64_gnullvm",
+ "windows_aarch64_msvc",
+ "windows_i686_gnu",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_gnullvm",
+ "windows_x86_64_msvc",
+]
+
+[[package]]
+name = "windows_aarch64_gnullvm"
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+
+[[package]]
+name = "windows_aarch64_msvc"
+version = "0.52.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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+
+[[package]]
+name = "windows_i686_gnu"
+version = "0.52.4"
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+[[package]]
+name = "windows_i686_msvc"
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+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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+[[package]]
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Cargo.toml

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+[package]
+name = "rust_dll"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies]
+windows = { version = "0.54.0", features = [
+    "Win32_System_LibraryLoader",
+    "Win32_UI_WindowsAndMessaging",
+    "Win32_System_SystemServices",
+] }
+
+#version = "0.52"
+#features = [
+#    "Data_Xml_Dom",
+#    "Win32_Foundation",
+#    "Win32_Security",
+#    "Win32_System_Threading",
+#    "Win32_UI_WindowsAndMessaging",
+#    "Win32_System_SystemServices"
+#]

src/lib.rs

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+use windows::{Win32::UI::WindowsAndMessaging::{MessageBoxA, MB_OK}, Win32::System::SystemServices::*,};
+use windows::core::s;
+
+#[no_mangle]
+#[allow(non_snake_case)]
+fn DllMain(_: usize, dw_reason: u32, _: usize) -> i32 {
+    match dw_reason {
+        DLL_PROCESS_ATTACH => attach(),
+        _ => (),
+    }
+
+    1
+}
+
+fn attach() {
+    unsafe {
+        MessageBoxA(None, s!("Hello from Rust DLL"), s!("Hello from Rust DLL"), MB_OK);
+    }
+}