从 C 调用 Cocoa API [英] Calling Cocoa APIs from C

问题描述

我不知道这是否可行，但是使用纯 C 语言编写代码，是否可以从中调用 Cocoa API?
像#include 之类的，添加对应的库就可以了?

I don't know if this is possible, but having code in plain C, is it possible to call Cocoa API's from it?
Something like #include <cocoa.h>, add the corresponding library and go for it?

感谢您的帮助

推荐答案

如果链接到 Cocoa 或 Foundation 框架，则可以在 C 代码中使用 Objective-c.但是，如果您想使用正常的消息传递语法，则必须将文件扩展名从 .c 更改为 .m，以便将其编译为 Objective-c.如果您保留 .c 扩展名，您将只能使用 c 样式的运行时调用与目标对象(即 objc_msgSend、objc_getClass 等)进行交互.

If you link against the Cocoa or Foundation frameworks, you can use objective-c within your C code. However, if you want to use the normal messaging syntax, you will have to change the file extension from .c to .m so that it is compiled as objective-c. If you keep the .c extension, you will only be able to use the c-style runtime calls to interact with objective-objects (i.e. objc_msgSend, objc_getClass, etc.).

示例:在 .m 文件中

Examples: Within a .m file

void cFunction() {
    [[NSString alloc] init];
}

在 .c 文件中

void cFunction() {
    void* cls = objc_getClass("NSString");
    void* obj = objc_msgSend(cls, NSSelectorFromString(CFSTR("alloc")));
    obj = objc_msgSend(obj, NSSelectorFromString(CFSTR("init")));
}

如果选择第二种方法，请参见Objective-C 运行时参考.

If you choose the second method, see the Objective-C Runtime Reference.

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