[英]Swift use c struct
Sorry for the title, I can't find words to describe my question in few words. 对不起标题,我找不到用几句话来形容我的问题。
I already know that swift can use struct written in c. 我已经知道swift可以使用c编写的struct。 For example 例如
In Bridging-Header.h 在Bridging-Header.h中
typedef struct {
int x;
int y;
} Pointer;
then I can use Pointer directly. 然后我可以直接使用Pointer。
But in my case, I have a library written in C. There are many structs with hidden implement. 但就我而言,我有一个用C语言编写的库。有许多带有隐藏工具的结构。 For example: 例如:
In Briding-Header.h 在Briding-Header.h中
typedef struct Pointer Pointer;
I can't use Pointer any more, got unknown type. 我不能再使用Pointer了,得到了未知类型。 In my library Pointer is used as 在我的库中,Pointer用作
create_pointer(Pointer **pointer);
Any help is appreciated! 任何帮助表示赞赏!
PS I have no .h file which define struct Pointer. PS我没有定义struct Pointer的.h文件。 All details about Pointer is hide, access them by function, for example 关于Pointer的所有细节都是隐藏,例如,通过函数访问它们
int getx(Pointer *pointer);
Here is my full test code: 这是我的完整测试代码:
user_input.c user_input.c
#include <stdio.h>
#include "user_input.h"
struct Pointer {
int x;
int y;
};
void get_user_input(int *user_input) {
scanf("%i", user_input);
}
void init_pointer(Pointer *point) {
point->x = 20;
point->y = 20;
}
user_input.h user_input.h
#ifndef __user_input_h__
#define __user_input_h__
typedef struct Pointer Pointer;
void init_pointer(Pointer *p);
#endif
Bridging-Header.h 转职Header.h
#include "user_input.h"
main.swift main.swift
import Foundation
var pointer:Pointer = Pointer(x:10, y:20)
Xcode give me this error: Pointer undefined Xcode给我这个错误:指针未定义
Bridging-Header.h 转职Header.h
#include "user_input.h"
user_input.c user_input.c
#include <stdlib.h>
struct Pointer {
int x;
int y;
};
Pointer *create_pointer() {
Pointer *p = malloc(sizeof(struct Pointer));
if (p) {
p->x = 20;
p->y = 20;
}
return p;
}
void delete_pointer(Pointer *p) {
free(p);
}
int pointer_x(Pointer *p) {
return p->x;
}
int pointer_y(Pointer *p) {
return p->y;
}
user_input.h user_input.h
#ifndef __user_input_h__
#define __user_input_h__
typedef struct Pointer Pointer;
Pointer *create_pointer();
void delete_pointer(Pointer *p);
int pointer_x(Pointer *p);
int pointer_y(Pointer *p);
#endif
main.swift main.swift
import Foundation
var pointer: COpaquePointer = create_pointer()
println("\(pointer_x(pointer)), \(pointer_y(pointer))")
delete_pointer(pointer)
// Writing the wrapper class could be helpful.
class CPointer {
var _ptr: COpaquePointer
init() {
_ptr = create_pointer()
assert(_ptr, "Failed on create_pointer()")
}
deinit {
delete_pointer(_ptr)
}
var x: Int {
get { return Int(pointer_x(_ptr)) }
}
var y: Int {
get { return Int(pointer_y(_ptr)) }
}
}
var p = CPointer()
println("\(p.x), \(p.y)")
You should be OK if you include the original header where Pointer is typedef-ed in ___Bridging-Header.h 如果在___ Bridging-Header.h中包含Pointer类型定义的原始标题,则应该没问题
So for example if you have foo.h where you declare your struct and your functions, then instead of doing any additional typdef calls in your bridging header just #import foo.h
因此,例如,如果你有foo.h,你声明你的结构和你的函数,那么不要在你的桥接头中进行任何额外的typdef调用#import foo.h
Then your Swift code should be able to see the symbols declared in foo.h 然后你的Swift代码应该能够看到foo.h中声明的符号
Update: 更新:
What you need: 你需要什么:
#include foo.h
在“foo-Bridging-Header.h”中,你需要#include foo.h
For example, I have a Swift project. 例如,我有一个Swift项目。 In this project I have a Swift file (main.swift), a C header (test.h), a C source file (test.c), and a Bridging Header (test-Bridging-Header.h). 在这个项目中,我有一个Swift文件(main.swift),一个C头文件(test.h),一个C源文件(test.c)和一个Bridging Header(test-Bridging-Header.h)。
Their contents are as follows: 他们的内容如下:
void printFoo();
#include <stdio.h> #include "test.h" void printFoo() { printf("foo\\n"); }
#import "test.h"
import Foundation println("Hello, World!") printFoo()
When run, this outputs: 运行时,输出:
Hello, World! foo
After change my question, I got an answer. 在改变我的问题后,我得到了答案。
When the struct implements in hidden, this is called "opaque" 当struct在hidden中实现时,这被称为“不透明”
so I can use COpaquePointer. 所以我可以使用COpaquePointer。
var pointer: COpaquePointer = COpaquePointer.null()
// some init code.
init_pointer(pointer);
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