OpenCV中奇怪的无与伦比的花括号 [英] Strange unmatched curly brace in OpenCV

问题描述

我正在使用适用于iPhone的OpenCV版本，但遇到了一个有点奇怪的错误.在使用拼接器时，某些导入的标头现在抱怨此行上不匹配的'{':

I am using the version of OpenCV for iPhone, and I have encountered a somewhat strange error. In using the stitcher, some of the imported headers are now complaining about an unmatched '{' on this line:

enum { NO, FEATHER, MULTI_BAND };

NO是objc.h中的宏，定义为

NO is a macro from objc.h which is defined as

#define NO              __objc_no

编译器期望一个'}'与枚举的开头相匹配，尽管稍后会有一个.发生什么事了?

And the compiler is expecting a '}' to match the opening of the enum, even though there is one just a little later on. What is happening?

推荐答案

很长一段时间以来，我一直遇到相同的问题，而我现在发现了一种解决方法.如您所言，这是UIKit中NO-makro定义的问题.您需要做的是转到您的.pch文件并替换

I have been having the same problem for a long time and I have just now discovered a workaround. As you stated correctly it is a problem with definition of the NO-makro in UIKit. What you need to do is go to your .pch-file and replace

#ifdef __cplusplus
#import <opencv2/opencv.hpp>
#endif

使用

#ifdef __cplusplus
#import <opencv2/opencv.hpp>
#import <opencv2/stitching/detail/blenders.hpp>
#import <opencv2/stitching/detail/exposure_compensate.hpp>
#endif

因此，您生成的.pch应该看起来像这样:

So your resulting .pch should look something like this:

//
// Prefix header for all source files of the 'Project' target in the 'Project' project
//

#import <Availability.h>

#ifndef __IPHONE_3_0
#warning "This project uses features only available in iOS SDK 3.0 and later."
#endif

#ifdef __cplusplus
#import <opencv2/opencv.hpp>
#import <opencv2/stitching/detail/blenders.hpp>
#import <opencv2/stitching/detail/exposure_compensate.hpp>
#endif

#ifdef __OBJC__
#import <UIKit/UIKit.h>
#import <Foundation/Foundation.h>
#endif

通过这种方式，可以在UIKit中的NO-makro之前定义blenders.hpp和Exposure_compensate.hpp中的NO枚举.

This way the NO-enums in blenders.hpp and exposure_compensate.hpp are defined before the NO-makro in UIKit.

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