X code，是否有可能拦截和更改code上构建，而无需更新文件？如果是这样，怎么样？ [英] Xcode, is it possible to intercept and change code on build without updating the file? If so, how?

问题描述

我需要一种方式，它进入编译器之前拦截code，改变它，并有/它保持相同的文件X型code之后。

I need a way to intercept the code before it goes into the compiler, change it, AND have it remain the same in the file / in Xcode afterwards.

我想构建脚本是一种流拦截，但似乎并不如此。另一种方法可能是之前和生成后运行一个脚本。是否有任何这方面的影响我应该知道的？

I thought build scripts were a sort of stream interception but that doesn't seem to be the case. Another method might be to run a script both before and after build. Are there any implications with this I should be aware of?

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为什么呢？我有基于某个注释语法自动记录系统的想法。我希望能够上构建，解析某些字符串和记录功能取代它，但有code保持不变。这可能吗？

Why? I have an idea for an auto-logging system based on a certain comment syntax. I want to be able, on build, to parse a certain string and replace it with a logging function but have the code remain unchanged. Is it possible?

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这似乎是一个自定义的编译器可能是向前迈出的一个封装当前LLVM铛的方式，或者至少一个插件。我一直在调查这个。下面是对于那些有兴趣一个相关的问题： X code自定义编译它包装并做了中继，以铿锵

It seems a custom compiler might be the way forward, or at least a plugin that wraps current LLVM clang. I've been investigating this. Here's a related question for those interested: Xcode custom compiler which wraps and does a passthru to clang

推荐答案

如果通过关于构建你居然编译code之前的意思是，这意味着你需要打开X code您想每次运行脚本。我不相信有办法做到这一点。但是，你可以使用的Automator运行code之前收到字符串，但您需要使用的Automator来构建应用程序，这是限制。另一种方法是使2班在您的应用程序：一个pre-运行类和主类。在pre-Run类将提示用户或读取一个文件（或类似的东西）来获取字符串，并根据不同的字符串以特殊的方式运行的主类。

If by "on build" you mean before actually compiling the code, that means you need to open Xcode every time you want to run your script. I don't believe there is a way to do this. However, you CAN use Automator to receive a string before running the code, but you would need to use Automator to build the app, which is limiting. Another method would be to make 2 classes in your app: a pre-run class and a main class. The pre-run class will prompt the user or read a file (or something like that) to get the string, and run the main class in a special way depending on the string.

编辑：回应置评

我不知道如何在Objective-C这样做，但你总是可以重命名你的主文件main.mm（.mm文件同时包含C ++和Objective-C code），并添加C ++ code到它。然而，这是使用控制台

I don't know how to do this in Objective-C, but you can always rename your main file to main.mm (.mm files contain both C++ and Objective-C code) and add C++ code to it. However, this is using the Console:

using namespace std // all  (this line is optional)
string s = ""; //      this
cin >> s; //           is C++  (if you omitted the optional line above, the correct code is std::cin >> s;
MainClass mc = //constructor for your "main class" here in Objective-C
if(s == someCertainString){ //hypothetical string and C++ condition checking for a C++ string
    [mc doThisACertainWay:];
}else if(s == someOtherString){ // again, hypothetical string that you need to declare
    [mc doThisADifferentWay];
}

我不是在PC上，所以我现在不能检查code，但您可以搜索如何读取和写入文件在C ++和的OBJ-C。唯一的提示我现在能给的是，你需要的#include＆LT; iostream的方式＆gt; 开头，如果你使用C ++读/写文件

I'm not on a PC now so I can't check code, but you can search for how to read and write to files in C++ and Obj-C. The only hint I can give right now is that you need #include <iostream> at the beginning if you use C++ to read/write the file.

如果你不想（如果你婉发布此这是正常的），使用控制台，你也可以做一个对话框。在这个例子中，你不需要C ++，这样你就不能重命名主文件。创建一个新的窗口（从现在起被称为 theDialog ），它是在启动可见光和确保您的主图形界面不显示启动。文本字段添加到 theDialog 并给它一个名称（在这个例子中， TF ）。添加一个标签来告诉用户将在文本字段的内容。添加一个按钮，并将其链接到一个动作。在这次行动中，把下面的code：

If you don't want to use the console (which is normal if you wan to publish this) you can also make a dialog. In this example, you don't need C++ so you don't rename the main file. Make a new window (referred to as theDialog from now on) that is visible at start and make sure that your main graphical interface does NOT show up startup. Add a text field to theDialog and give it a name (in this example, tf). Add a label to tell the user what to put in the text field. Add a button and link it to an action. In this action, put the following code:

MainClass mc = // constructor here
NSString *str = [self.tf stringValue];
if([str equalsString:someString]){ // hypothetical string and possible error in the condition checking, I'm new to Obj-C
    [mc doThisInACertainWay];
} else {
    [mc doThisInADifferentWay];
}

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