Adding a C++ Header to Objective-C project

Question

I've got a strange error working with Photoshop connection API in OSx. I need to include the header of a cpp file to my project... I start from the adobe example and I included the code in this way:

#include "PSCryptor.h"

which contains the PSCryptor class :

class PSCryptor
{
    public:
...

As soon as i try to use PSCrypor object, like with this code

static PSCryptor *sPSCryptor = NULL;

I get this error:

Unknown type name 'class'; did you mean 'Class'?

Could you help me to understand which is my error?

Chuck · Accepted Answer · 2012-05-09 22:50:23Z

2

The file is being included in Objective-C files — that is, they have the extension ".m" or they are specifically configured to be compiled as Objective-C (probably the former). Thus, the compiler tries to interpret the code as Objective-C, but C++ is not valid Objective-C, so it complains.

What you need to do is use Objective-C++ instead. Simple fix: change the extension of the files that use that header from ".m" to ".mm".

answered May 9, 2012 at 22:50

Chuck

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3 Comments

MatterGoal Over a year ago

the example used by Adobe works with a .cpp file, in your opinion how is this possible ?

Chuck Over a year ago

@MatterGoal: .cpp files are also compiled as C++, so that wouldn't be a problem. It sounds like the trouble you're having is that you're importing this header in a file that is not C++.

MatterGoal Over a year ago

@Chunk you're right! i can modify the extension with .mm or modify "file type" property in "identity and Type" box.

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