如何在XCode中使用c++和Objective-C

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.

我想在Objective-C中使用/重用c++对象。我有你好。h有类定义，还有hello。cpp类的实现。

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

And I use this class in Objective-C function.

我在Objective-C函数中使用这个类。

#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.

当我在Xcode中编译代码时，我得到了这个错误消息。

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?

到底是哪里出了错?

2 个解决方案

#1

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

确保将该文件编译为“Objective-C++”。

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

最简单的方法是将它重命名为*.mm。

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

如果不想重命名*。m文件,

Select your file.
选择您的文件。
Open the File Info dialog (Cmd+I)
打开文件信息对话框(Cmd+I)
In File Type, select "sourcecode.cpp.objcpp"
在文件类型中，选择“sourcecode.cpp.objcpp”

#2

Rename the Objective-C file from filename.m to filename.mm to make it compile as Objective-C++.

将Objective-C文件从文件名重命名。m文件名。将其编译为objective - c++。

#1