如何在 XCode 中使用 C++ 和 Objective-C [英] How can I use C++ with Objective-C in XCode

问题描述

我想在 Objective-C 中使用/重用 C++ 对象.我有一个包含类定义的 hello.h 和用于类实现的 hello.cpp.

class 你好{ int getX() ... };

我在 Objective-C 函数中使用了这个类.

#include "hello.h"...- (IBAction) adderTwo:(id)sender{你好 *hi = new Hello();int value = hi->getX();NSLog(@"你好 %d", value);[textField setIntValue:value];

当我在 Xcode 中编译代码时，我收到此错误消息.

<前>班级 你好 *XXXXX用户/smcho/Desktop/cocoa/adderTwo/hello.h:9:0/Users/smcho/Desktop/cocoa/adderTwo/hello.h:9:错误:在 'Hello' 之前应为 '=', ',', ';', 'asm' 或 '__attribute__'

出了什么问题?

解决方案

确保将该文件编译为Objective-C++".

最简单的方法是将其重命名为*.mm.

如果不想重命名*.m文件，

1. 选择您的文件.
2. 打开文件信息"对话框 (Cmd+I)
3. 在文件类型中，选择sourcecode.cpp.objcpp"

I want to use/reuse C++ object with Objective-C. I have a hello.h that has the class definition, and hello.cpp for class implementation.

class Hello
{ int getX() ... };

And I use this class in Objective-C function.

#include "hello.h"
...
- (IBAction) adderTwo:(id)sender
{
    Hello *hi = new Hello();            
    int value = hi->getX();
    NSLog(@"Hello %d", value);
    [textField setIntValue:value];

When I compile the code in Xcode, I get this error message.

class Hello *XXXXX
Users/smcho/Desktop/cocoa/adderTwo/hello.h:9:0
/Users/smcho/Desktop/cocoa/adderTwo/hello.h:9: 
error: expected '=', ',', ';', 'asm' or '__attribute__' before 'Hello'

What went wrong?

解决方案

Make sure you compile that file as "Objective-C++".

The simplest way is to rename it as *.mm.

If you don't want to rename the *.m file,

1. Select your file.
2. Open the File Info dialog (Cmd+I)
3. In File Type, select "sourcecode.cpp.objcpp"

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