120 lines
2.5 KiB
Markdown
120 lines
2.5 KiB
Markdown
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# ffigen
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源文件代码如下
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```c
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#ifndef HELLO_H
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#define HELLO_H
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#include "ppp.h" // 为了使用struct Point
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#include <stdio.h> // 标准库文件
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void hello();
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void say_hello(const char* name);
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void say_hello2(struct Point* p);
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#endif
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```
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只想生成当前文件下的函数声明，而不生成有关标准库里面的内容
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```yaml
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# pubsspey.yaml
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headers:
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entry-points:
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- "clibrary/hello.h"
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include-directives:
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- "**hello.h" # 使用相对路径不管用
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```
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生成出来的dart代码没有标准库中的符号。
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但是自动生成ppp.h中有关struct Point 结构体的相关内容（say_hello2函数参数用到了）
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```dart
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class Point extends ffi.Struct {
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@ffi.Int32()
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external int TID;
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@ffi.Int32()
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external int type;
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@ffi.Int32()
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......
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}
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```
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如果不关心结构体具体内容
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```yaml
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# pubsspey.yaml
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structs:
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dependency-only: opaque
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```
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生成的代码如下
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```dart
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class Point extends ffi.Opaque {} // error 需要手动修改
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// 修改后
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final class Point extends ffi.Opaque {}
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```
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ffi生成的class 有错误 需要手动更改
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```dart
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final class Point extends ffi.Struct {
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@ffi.Int32()
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external int x;
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} // 正确
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class Point extends ffi.Struct {
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@ffi.Int32()
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external int x;
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}// 错误，缺少final ffigen自动生成的
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```
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未避免每次生成都需要手动更改
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解决方案：第一次通过ffi生成后，将class复制到另外一个文件中 bindings.dart。但是生成的dart代码中找不到Point类型，需要引入bindings.dart这个文件。于是需要进行配置，
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使生成的代码，自动引入class所在的dart文件
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```yaml
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library-imports:
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point: 'bindings.dart' # @1 point需要引入dart文件，也可以引入其他package bindings存放了class Point
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type-map:
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'structs': # Point是结构体.
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'Point': # 依赖的C语言中的结构体名称
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'lib': 'point' # @1 名字自定义
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'c-type': 'Point' # import 'bindings.dart' as point ffi.Pointer<point.Point> // point文件中具体要使用的类型
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'dart-type': 'point'
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```
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```dart
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import 'bindings.dart' as point // @1;
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......
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void say_hello2(
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ffi.Pointer<point.Point> p,
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) {
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return _say_hello2(
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p,
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);
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}
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late final _say_hello2Ptr =
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_lookup<ffi.NativeFunction<ffi.Void Function(ffi.Pointer<point.Point>)>>(
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'say_hello2');
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late final _say_hello2 =
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_say_hello2Ptr.asFunction<void Function(ffi.Pointer<point.Point>)>();
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```
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生成的代码中既没有错误的class Point 也不需要手动引入正确的dart Point类
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