Xcode 4 中未声明 struct addrinfo
当使用 Xcode 4 进行一些套接字编程时，我遇到了一些奇怪的错误。尽管我只是从另一个有效的项目中复制了代码（当使用Xcode 3）。该项目主要是用 Objective-C 编写的，但我已经测试过用纯 C 创建另一个框架，但错误仍然存在。
我包括以下框架：
- ApplicationServices.framework
- Cocoa.framework
- AppKit.framework
- Foundation.framework
也没有添加链接器标志。
但是，还存在其他函数，例如 getaddrinfo（它使用 addrinfo 本身！）。有什么想法吗？
I'm running in to some strange errors when dabbling in some socket programming using Xcode 4. I get the error that addrinfo is undeclared, despite me simply copying the code from another project that did work (when using Xcode 3). The project is mainly in Objective-C, but I've tested creating another framework with plain C, and the error still remains.
I have the following frameworks included:
- ApplicationServices.framework
- Cocoa.framework
- AppKit.framework
- Foundation.framework
No added linker flags either.
However, other functions such as getaddrinfo (that uses addrinfo itself!) exists. Any ideas?
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这个问题与 IDE 无关，而是一个语言问题。 C（以及 Objective-c）和 C++（之前的项目是=）中处理结构的方式明显不同。所以我将这一行更改
为：
This issue wasn't IDE-related, it was a language issue. How structs are treated is apparently different in C (and thus Objective-c) and C++ (which the previous projects were=. So I changed the line
To:
你有正确的进口吗？
Have you got the correct imports?
快速 grep 显示 struct addrinfo 是在中声明的。尝试明确地包括这一点。 （您的 Xcode 3 项目可能已在其前缀文件中包含该文件或包含它的其他标头。）
A quick grep shows that struct addrinfo is declared in <netdb.h>. Try explicitly including that. (Your Xcode 3 project may have included that, or some other header that includes it, in its prefix file.)