How to Import C++ vector data to Swift

I have a C++ function that gets called by Swift that I need to return a vector of UIIMage's std::vector<UIImage *>. The only problem is I don't know how to retrieve the value of the vector.

C++ file 1:

//  OpenCVWrapper.h



#import <UIKit/UIKit.h>



@interface OpenCVWrapper : NSObject



+(???) convert:(UIImage *) image;



@end

file 2:

//  OpenCVWrapper.mm

#import "OpenCVWrapper.h"

#import <opencv2/opencv.hpp>

#import <opencv2/imgcodecs/ios.h>



class Converter {

public:

    UIImage *image;        

    std::vector<UIImage *> main() {



        // run code 



        return finalImage;

    };



};



@implementation OpenCVWrapper



+(std::vector<UIImage *>) convert:(UIImage *)image {

    Converter converter;

    converter.image = image;

    std::vector<UIImage *>newImage = converter.main();



    return newImage;



}



@end

Swift:

var multipleImages = OpenCVWrapper.convert(originalImage) //want array

I'm aware Swift doesn't import c++ data structures, I'm looking to extract the values from the vector.

Thanks in advance.

edited Nov 21 '18 at 0:26

asked Nov 21 '18 at 0:20

Cristian

90115

1

std::vector::dataalong with another parameter for the length usually works.

– user4581301
Nov 21 '18 at 0:40

add a comment |

I have a C++ function that gets called by Swift that I need to return a vector of UIIMage's std::vector<UIImage *>. The only problem is I don't know how to retrieve the value of the vector.

C++ file 1:

//  OpenCVWrapper.h



#import <UIKit/UIKit.h>



@interface OpenCVWrapper : NSObject



+(???) convert:(UIImage *) image;



@end

file 2:

//  OpenCVWrapper.mm

#import "OpenCVWrapper.h"

#import <opencv2/opencv.hpp>

#import <opencv2/imgcodecs/ios.h>



class Converter {

public:

    UIImage *image;        

    std::vector<UIImage *> main() {



        // run code 



        return finalImage;

    };



};



@implementation OpenCVWrapper



+(std::vector<UIImage *>) convert:(UIImage *)image {

    Converter converter;

    converter.image = image;

    std::vector<UIImage *>newImage = converter.main();



    return newImage;



}



@end

Swift:

var multipleImages = OpenCVWrapper.convert(originalImage) //want array

I'm aware Swift doesn't import c++ data structures, I'm looking to extract the values from the vector.

Thanks in advance.

edited Nov 21 '18 at 0:26

asked Nov 21 '18 at 0:20

Cristian

90115

1

std::vector::dataalong with another parameter for the length usually works.

– user4581301
Nov 21 '18 at 0:40

add a comment |

I have a C++ function that gets called by Swift that I need to return a vector of UIIMage's std::vector<UIImage *>. The only problem is I don't know how to retrieve the value of the vector.

C++ file 1:

//  OpenCVWrapper.h



#import <UIKit/UIKit.h>



@interface OpenCVWrapper : NSObject



+(???) convert:(UIImage *) image;



@end

file 2:

//  OpenCVWrapper.mm

#import "OpenCVWrapper.h"

#import <opencv2/opencv.hpp>

#import <opencv2/imgcodecs/ios.h>



class Converter {

public:

    UIImage *image;        

    std::vector<UIImage *> main() {



        // run code 



        return finalImage;

    };



};



@implementation OpenCVWrapper



+(std::vector<UIImage *>) convert:(UIImage *)image {

    Converter converter;

    converter.image = image;

    std::vector<UIImage *>newImage = converter.main();



    return newImage;



}



@end

Swift:

var multipleImages = OpenCVWrapper.convert(originalImage) //want array

I'm aware Swift doesn't import c++ data structures, I'm looking to extract the values from the vector.

Thanks in advance.

edited Nov 21 '18 at 0:26

asked Nov 21 '18 at 0:20

Cristian

90115

I have a C++ function that gets called by Swift that I need to return a vector of UIIMage's std::vector<UIImage *>. The only problem is I don't know how to retrieve the value of the vector.

C++ file 1:

//  OpenCVWrapper.h



#import <UIKit/UIKit.h>



@interface OpenCVWrapper : NSObject



+(???) convert:(UIImage *) image;



@end

file 2:

//  OpenCVWrapper.mm

#import "OpenCVWrapper.h"

#import <opencv2/opencv.hpp>

#import <opencv2/imgcodecs/ios.h>



class Converter {

public:

    UIImage *image;        

    std::vector<UIImage *> main() {



        // run code 



        return finalImage;

    };



};



@implementation OpenCVWrapper



+(std::vector<UIImage *>) convert:(UIImage *)image {

    Converter converter;

    converter.image = image;

    std::vector<UIImage *>newImage = converter.main();



    return newImage;



}



@end

Swift:

var multipleImages = OpenCVWrapper.convert(originalImage) //want array

I'm aware Swift doesn't import c++ data structures, I'm looking to extract the values from the vector.

Thanks in advance.

c++ swift vector

edited Nov 21 '18 at 0:26

asked Nov 21 '18 at 0:20

Cristian

90115

edited Nov 21 '18 at 0:26

asked Nov 21 '18 at 0:20

Cristian

90115

edited Nov 21 '18 at 0:26

asked Nov 21 '18 at 0:20

Cristian

90115

asked Nov 21 '18 at 0:20

Cristian

90115

asked Nov 21 '18 at 0:20

Cristian

90115

1

std::vector::dataalong with another parameter for the length usually works.

– user4581301
Nov 21 '18 at 0:40

add a comment |

1

std::vector::dataalong with another parameter for the length usually works.

– user4581301
Nov 21 '18 at 0:40

std::vector::dataalong with another parameter for the length usually works.

– user4581301
Nov 21 '18 at 0:40

add a comment |

1 Answer
1

active

oldest

votes

You can't use std::vector from Swift, so don't return a std::vector.

Since your vector contains instances of UIImage, simply return a NSArray:

+ ( NSArray< UIImage * > * )convert: ( UIImage * )image

{

    Converter converter;

    converter.image = image;



    NSMutableArray * images = [ NSMutableArray new ];



    for( auto i: converter.main() )

    {

        [ images addObject: i ];

    }



    return images;

}

edited Nov 21 '18 at 15:51

answered Nov 21 '18 at 15:02

Macmade

42.1k1193114

Thank you, this is exactly what I was looking for

– Cristian
Nov 21 '18 at 17:10

add a comment |

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1 Answer
1

active

oldest

votes

1 Answer
1

active

oldest

votes

You can't use std::vector from Swift, so don't return a std::vector.

Since your vector contains instances of UIImage, simply return a NSArray:

+ ( NSArray< UIImage * > * )convert: ( UIImage * )image

{

    Converter converter;

    converter.image = image;



    NSMutableArray * images = [ NSMutableArray new ];



    for( auto i: converter.main() )

    {

        [ images addObject: i ];

    }



    return images;

}

edited Nov 21 '18 at 15:51

answered Nov 21 '18 at 15:02

Macmade

42.1k1193114

Thank you, this is exactly what I was looking for

– Cristian
Nov 21 '18 at 17:10

add a comment |

You can't use std::vector from Swift, so don't return a std::vector.

Since your vector contains instances of UIImage, simply return a NSArray:

+ ( NSArray< UIImage * > * )convert: ( UIImage * )image

{

    Converter converter;

    converter.image = image;



    NSMutableArray * images = [ NSMutableArray new ];



    for( auto i: converter.main() )

    {

        [ images addObject: i ];

    }



    return images;

}

edited Nov 21 '18 at 15:51

answered Nov 21 '18 at 15:02

Macmade

42.1k1193114

Thank you, this is exactly what I was looking for

– Cristian
Nov 21 '18 at 17:10

add a comment |

You can't use std::vector from Swift, so don't return a std::vector.

Since your vector contains instances of UIImage, simply return a NSArray:

+ ( NSArray< UIImage * > * )convert: ( UIImage * )image

{

    Converter converter;

    converter.image = image;



    NSMutableArray * images = [ NSMutableArray new ];



    for( auto i: converter.main() )

    {

        [ images addObject: i ];

    }



    return images;

}

edited Nov 21 '18 at 15:51

answered Nov 21 '18 at 15:02

Macmade

42.1k1193114

You can't use std::vector from Swift, so don't return a std::vector.

Since your vector contains instances of UIImage, simply return a NSArray:

+ ( NSArray< UIImage * > * )convert: ( UIImage * )image

{

    Converter converter;

    converter.image = image;



    NSMutableArray * images = [ NSMutableArray new ];



    for( auto i: converter.main() )

    {

        [ images addObject: i ];

    }



    return images;

}

edited Nov 21 '18 at 15:51

answered Nov 21 '18 at 15:02

Macmade

42.1k1193114

edited Nov 21 '18 at 15:51

answered Nov 21 '18 at 15:02

Macmade

42.1k1193114

answered Nov 21 '18 at 15:02

Macmade

42.1k1193114

answered Nov 21 '18 at 15:02

Macmade

42.1k1193114

Thank you, this is exactly what I was looking for

– Cristian
Nov 21 '18 at 17:10

add a comment |

Thank you, this is exactly what I was looking for

– Cristian
Nov 21 '18 at 17:10

Thank you, this is exactly what I was looking for

– Cristian
Nov 21 '18 at 17:10

add a comment |

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