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README.md

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backup/在 Rust中 动态链接和运行时加载动态库.md

@@ -0,0 +1,113 @@
+## 动态链接crate
+
+**假设动态库是 impls**
+**需要链接到 impls的crate是abi**
+
+```bash
+├── abi                     # runtime loading library
+│  ├── Cargo.toml           # specifies dependent libraries to be used for dynamic linking
+│  └── src
+│     ├── import.rs         # import impls to this crate
+│     ├── lib.rs            # 
+│     └── main.rs           # test main: loading abi and binding interface
+├── impls                   # dynamic link library 
+│  └── src
+│     └── lib.rs            # impls
+└── README.md
+```
+
+`main` == loadl ibrary => `abi` == dynamic link ==> `impls`
+
+设置lib类型为`cdylib`
+```toml
+# impls/Cargo.toml
+[lib]
+crate-type = ["cdylib"]
+```
+
+导出接口
+```rust
+// impls/src/lib.rs
+#[no_mangle]
+pub extern "C" fn add(left: usize, right: usize) -> usize {
+    left + right
+}
+```
+
+
+
+设置依赖 
+```toml
+# abi/Cargo.toml
+[dependencies]
+impls = { path = "../impls" }
+```
+
+接口定义
+```rust
+#[link(name = "impls")]
+extern "C" {
+    pub fn add(a :usize, b: usize) -> usize;
+}
+```
+
+调用接口
+```rust
+println!("Add {}", add(1, 9));
+```
+
+## 运行时加载动态库
+因为是运行时加载，所以函数的接口不需要单独定义，通常是绑定到函数指针上
+
+```toml
+# abi/Cargo.toml
+[dependencies]
+impls = { path = "../impls" }
+libloading = "0.8.5"
+```
+
+```rust
+// abi/src/main.rs
+use libloading::{Library, Symbol};
+
+static DLL_HANDLE:Lazy<Library> = Lazy::new(|| {
+    unsafe {
+        let dll = std::env::args().nth(1).expect("No DLL provided");
+        Library::new(dll).expect("Failed to load DLL")
+    }
+});
+
+// 定义好函数指针的结构体
+#[derive(Debug)]
+struct Interface<'a> {
+    add: Symbol<'a, extern "C" fn(usize, usize) -> usize>,
+    init: Symbol<'a, extern "C" fn() -> ()>,
+}
+
+// 加载动态库后，绑定函数指针
+impl <'a> Interface<'a> {
+    fn new() -> Self {
+        unsafe {
+            let add: Symbol<extern "C" fn(usize, usize) -> usize> = DLL_HANDLE.borrow().get(b"add").expect("Failed to load add");
+            let init: Symbol<extern "C" fn() -> ()> = DLL_HANDLE.borrow().get(b"init").expect("Failed to load init");
+            Interface {
+                add,
+                init
+            }
+        }
+    }
+}
+
+fn main() {
+    let handle = Interface::new();
+    (handle.init)();
+    let result = (handle.add)(1, 9);
+    println!("Result: {}", result);
+
+}
+
+```
+
+
+## Demo
+项目地址 [Demo](https://github.com/kylinholmes/rs_dynamic_link)

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runtime loading library\r\n\u2502  \u251c\u2500\u2500 Cargo.toml           # specifies dependent libraries to be used for dynamic linking\r\n\u2502  \u2514\u2500\u2500 src\r\n\u2502     \u251c\u2500\u2500 import.rs         # import impls to this crate\r\n\u2502     \u251c\u2500\u2500 lib.rs            # \r\n\u2502     \u2514\u2500\u2500 main.rs           # test main: loading abi and binding interface\r\n\u251c\u2500\u2500 impls                   # dynamic link library \r\n\u2502  \u2514\u2500\u2500 src\r\n\u2502     \u2514\u2500\u2500 lib.rs            # impls\r\n\u2514\u2500\u2500 README.md\r\n```\r\n\r\n`main` == loadl ibrary => `abi` == dynamic link ==> `impls`\r\n\r\n\u8bbe\u7f6elib\u7c7b\u578b\u4e3a`cdylib`\r\n```toml\r\n# impls/Cargo.toml\r\n[lib]\r\ncrate-type = ['cdylib']\r\n```\r\n\r\n\u5bfc\u51fa\u63a5\u53e3\r\n```rust\r\n// impls/src/lib.rs\r\n#[no_mangle]\r\npub extern 'C' fn add(left: usize, right: usize) -> usize {\r\n    left + right\r\n}\r\n```\r\n\r\n\r\n\r\n\u8bbe\u7f6e\u4f9d\u8d56 \r\n```toml\r\n# abi/Cargo.toml\r\n[dependencies]\r\nimpls = { path = '../impls' }\r\n```\r\n\r\n\u63a5\u53e3\u5b9a\u4e49\r\n```rust\r\n#[link(name = 'impls')]\r\nextern 'C' {\r\n    pub fn add(a :usize, b: usize) -> usize;\r\n}\r\n```\r\n\r\n\u8c03\u7528\u63a5\u53e3\r\n```rust\r\nprintln!('Add {}', add(1, 9));\r\n```\r\n\r\n## \u8fd0\u884c\u65f6\u52a0\u8f7d\u52a8\u6001\u5e93\r\n\u56e0\u4e3a\u662f\u8fd0\u884c\u65f6\u52a0\u8f7d\uff0c\u6240\u4ee5\u51fd\u6570\u7684\u63a5\u53e3\u4e0d\u9700\u8981\u5355\u72ec\u5b9a\u4e49\uff0c\u901a\u5e38\u662f\u7ed1\u5b9a\u5230\u51fd\u6570\u6307\u9488\u4e0a\r\n\r\n```toml\r\n# abi/Cargo.toml\r\n[dependencies]\r\nimpls = { path = '../impls' }\r\nlibloading = '0.8.5'\r\n```\r\n\r\n```rust\r\n// abi/src/main.rs\r\nuse libloading::{Library, Symbol};\r\n\r\nstatic DLL_HANDLE:Lazy<Library> = Lazy::new(|| {\r\n    unsafe {\r\n        let dll = std::env::args().nth(1).expect('No DLL provided');\r\n        Library::new(dll).expect('Failed to load DLL')\r\n    }\r\n});\r\n\r\n// \u5b9a\u4e49\u597d\u51fd\u6570\u6307\u9488\u7684\u7ed3\u6784\u4f53\r\n#[derive(Debug)]\r\nstruct Interface<'a> {\r\n    add: Symbol<'a, extern 'C' fn(usize, usize) -> usize>,\r\n    init: Symbol<'a, extern 'C' fn() -> ()>,\r\n}\r\n\r\n// \u52a0\u8f7d\u52a8\u6001\u5e93\u540e\uff0c\u7ed1\u5b9a\u51fd\u6570\u6307\u9488\r\nimpl <'a> Interface<'a> {\r\n    fn new() -> Self {\r\n        unsafe {\r\n            let add: Symbol<extern 'C' fn(usize, usize) -> usize> = DLL_HANDLE.borrow().get(b'add').expect('Failed to load add');\r\n            let init: Symbol<extern 'C' fn() -> ()> = DLL_HANDLE.borrow().get(b'init').expect('Failed to load init');\r\n            Interface {\r\n                add,\r\n                init\r\n            }\r\n        }\r\n    }\r\n}\r\n\r\nfn main() {\r\n    let handle = Interface::new();\r\n    (handle.init)();\r\n    let result = (handle.add)(1, 9);\r\n    println!('Result: {}', result);\r\n    \r\n}\r\n\r\n```\r\n\r\n\r\n## Demo\r\n\u9879\u76ee\u5730\u5740 [Demo](https://github.com/kylinholmes/rs_dynamic_link)\u3002", "top": 0, "createdAt": 1723438079, "style": "", "script": "", "head": "", "ogImage": "https://avatars.githubusercontent.com/u/45586871?v=4", "createdDate": "2024-08-12", "dateLabelColor": "#bc4c00"}}, "singeListJson": {}, "labelColorDict": {"bug": "#d73a4a", "documentation": "#0075ca", "duplicate": "#cfd3d7", "enhancement": "#a2eeef", "good first issue": "#7057ff", "help wanted": "#008672", "invalid": "#e4e669", "question": "#d876e3", "rust": "#DA545B", "wontfix": "#ffffff"}, "displayTitle": "Kylin's", "faviconUrl": "https://avatars.githubusercontent.com/u/45586871?v=4", "ogImage": "https://avatars.githubusercontent.com/u/45586871?v=4", "primerCSS": "<link href='https://mirrors.sustech.edu.cn/cdnjs/ajax/libs/Primer/21.0.7/primer.css' rel='stylesheet' />", "homeUrl": "https://kylinholmes.github.io", "prevUrl": "disabled", "nextUrl": "disabled"}

docs/index.html

@@ -80,7 +80,18 @@ <h1>
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+    <div class="listLabels">
+
+        <span class="Label LabelName" style="background-color:#DA545B"><object><a style="color:#fff" href="tag.html#rust">rust</a></object></span>
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