Question

I am trying to develop a C++ library for an iOS application. This library loads the GLES and OpenAL functions. The idea is to develop a library in C++ and use the same code in iOS and Android (both as native compilation). I am only with the iOS implementation, and I have done a sample application with the library and I have this block inside the library:

#ifdef _IPHONE_4_0

    #warning "Including iPhone SDK 4.0 working here"     // compiling warning is actived

    #include    <OpenGLES/ES2/gl.h>
    #include    <OpenGLES/ES2/glext.h>

    #include    <OpenAL/al.h>
    #include    <OpenAL/alc.h>

    ...

#elif __ANDROID_API_ // Android

    #warning "Including Android working here"   // Compiling warning is not actived
        ...

#endif

因此,问题在于句子“#ifdef_Iphone_4_0” 。如果我使用它, Xcode 找不到包含的文件, 但是如果我对所有的 if lalusule (和机器人部分) 进行评论, Xcode 可以找到所有的文件。

#warning sentences shows that the compiler is reading the iphone part (with and without lines commented) in compilation time. Do I need to use the definition in other way?

提前感谢!

Answer 1

检查此文章 < a href=" "https://stackoverflow.com/ questions/5919996/ how-to- detect- reliable-mac-os-x-ios-ios-linux- windows-in- c- preceror" > 如何检测可靠的Mac OS X、iOS、Linux、C预处理器中的窗口?

此外,据我所知, iOs 4. 0 SDK 中只定义了 iphone_ 4_ 0 宏。因此, 如果您使用另一个版本的 SDK, 代码不应该有效。

另一种方法是在 Xcode 项目构建设置( 预处理器宏字段) 中定义您自己的宏, 并命名为 IOS_ BUILD, 例如。它将以 - 目标- c 和 c++ 代码同时提供。

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