Objective-c 的新手，Hello World [英] New to Objective-c, Hello World

问题描述

我刚刚开始学习 Objective-C 编程.我正在 iMac 上的 Mac OS X 10.7.2 版上使用 Xcode 4.2 进行开发.我正在阅读 Stephen Kochan 的Objective-C 编程"一书，其中包含一个简单的Hello World"示例:

I am just starting to learn Objective-C programming. I'm developing in Xcode 4.2 on Mac OS X version 10.7.2 on an iMac. I am reading the book "Programming in Objective-C" by Stephen Kochan, which contains a simple "Hello World" example:

#import <Foundation/Foundation.h>

int main (int argc, const char * argv[])
{
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
    NSLog (@"Hello, World!");
    [pool drain];
    return 0;
}

编译时会出现很多错误:

It bombs out with lots of errors when compiling:

/Developer/SDKs/MacOSX10.7.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h:313:19:错误:未知类型名称NSString"[1]

/Developer/SDKs/MacOSX10.7.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h:313:19: error: unknown type name 'NSString' [1]

类似的还有很多.第一次编译之前有什么需要做的吗?在 Xcode 中进行一些设置?

There are lots more like this. Is there something that needs to be done before compiling for the first time? Some setup in Xcode?

推荐答案

Unknown typename NSString 表示您将目标 c 代码传递给(普通)c 编译器

Unknown typename NSString means you are passing objective c code to (normal) c compiler

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