Xcode LLVM处理器宏的Stringify端点 [英] Stringify Endpoint for Xcode LLVM Processor Macros

问题描述

在构建设置"选项卡下的"Apple LLVM 7.0-预处理"部分中，我将预处理器宏定义为:

In the "Apple LLVM 7.0 - Preprocessing" section under the "Build Settings" tab, I've defined a Preprocessor Macros as:

STR(arg)=#arg
HUBNAME=STR("myhub")
HUBLISTENACCESS=STR("Endpoint=sb://abc-xyz.servicebus.windows.net/;SharedAccessKeyName=DefaultListenSharedAccessSignature;SharedAccessKey=JKLMNOP=")

在我的代码中，我试图将HUBLISTENACCESS的值称为字符串:

In my code, I'm trying to refer to the value of HUBLISTENACCESS as a string:

SBNotificationHub* hub = [[SBNotificationHub alloc] initWithConnectionString:@HUBLISTENACCESS notificationHubPath:@HUBNAME];

但是我从Xcode收到有关集线器"初始化的错误消息:

But I'm getting errors from Xcode for the initialization of "hub":

预期的';'声明结束

Expected ';' at end of declaration

无终止的函数式宏调用

程序中出现意外的'@'

Unexpected '@' in program

我怀疑预处理器宏中的HUBLISTENACCESS定义需要正确转义，但我尝试了一些尝试，但似乎无法正确解决.有人可以帮助我了解我在做什么错吗?

I suspect that the definition of HUBLISTENACCESS in the Preprocessor Macros needs to be properly escaped but I've tried a few things and can't seem to get it right. Can somebody help me understand what I'm doing wrong?

推荐答案

有一个非常明显的原因，您尝试执行失败的原因是:在HUBLISTENACCESS中使用//.与C中一样，//之后的内容已被注释掉，因此在编译器方面，您的最后一行实际上是:

There's one very obvious reason why you were trying to do failed: you use // in the HUBLISTENACCESS. As in C, things after // were commented out so in the aspect of the compiler, the last line of yours is actually:

HUBLISTENACCESS=STR("Endpoint=sb:

要测试它，只需删除一个斜杠，它将再次起作用.您正在做的事情就像尝试定义这样的事情:

To test it, just remove one slash and it will work again. What you were doing like trying to define things as such:

#define FOO //

我认为这是不可能的.老实说，我不知道如何在 Build Settings 中进行操作，但是还有其他方法可以通过 PCH文件(前缀标头)在全球范围内进行操作.

which I don't think it's possible. I honestly have no idea how you can do that within the Build Settings, but there are other ways to do it globally via a PCH file (prefix header).

PCH中的一条简单的线将节省所有这些麻烦:

A simple line within the PCH will will save all those troubles:

#define HUBLISTENACCESS @"Endpoint=sb://abc-xyz.servicebus.windows.net/;SharedAccessKeyName=DefaultListenSharedAccessSignature;SharedAccessKey=JKLMNOP="

然后按以下方式使用它:(不再需要@！)

Then use it as below: (no more @ needed!)

NSLog(@"%@", HUBLISTENACCESS);

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