using OpenCV FileStorage in LabVIEW

[SilvaShi]

I'd like to use the OpenCV's FileStorage function in the LabVIEW. Mainly because I want to transfer a c++ project to a LabVIEW project.

But in this case, i can't load the xml file. 

i tested it in a consolo project, it seems to work.

here is the code:

#include <opencv2/core/core.hpp>
#include <opencv2/imgproc/imgproc.hpp>

using namespace std;
using namespace cv;

class myclass{
public:
FileStorage f;
Mat temp;
int loadfile(){
f.open("C:\\Users\\Silva\\Documents\\results\\text.xml",FileStorage::READ);
if(!f.isOpened())
return -1;
f["count"]>>temp;
return 0;
};
};

myclass temp;

extern "C"{
_declspec (dllexport) int loadfile();
}

_declspec (dllexport) int loadfile(){
int error_code;
error_code = temp.loadfile();
if(error_code!=-1)
return 0;
return -1;
}

[Klemen]

Hello,

first, did you try debugging the code?

Best regards,

K

[SilvaShi]

Thank you for your kindness.

Yes, i wrote it and tryed it as a consolo project, it seems work well. 

but when i change it to a dll project, labVIEW reported an error, 

[Klemen]

No, I meant debugging the calling .dll in Labview via the Visual Studio, or whatever programing environment you are using...

I know you've added the sorce code to the previous post, but can you also attach the .cpp file you are using?

Best regards,

K

[SilvaShi]

Thank you ,klemen.

Yes,I debugged it in VS2010,  and it worked well.(OpenCV2.4.8)

But when i call the dll in LabVIEW2011, it reported the error .

As you can see, i attached the cpp file, vi, xml file and dll as a zip file in the fisrt post.

[Klemen]

I am really sorry, somehow I missed that...

No error with your code here:

Best regards,

K

[SilvaShi]

Thank you ,klemen.

I think i choose the wrong version of the dll file.

i chose the release version.

I change it to the debug version and it works!

Thank you.

But I still don't know why the release version don't work.

[Klemen]

Hello,

the release build also works here.

Best regards,

K

[SilvaShi]

Thank you ,klemen.

I have tested it and it works.

But i have another question.

for example I draw an circle or points on an image . How can i return the image to LabVIEW and display it?

[Klemen]

Hello,

have you seen the link in my signature?

There you will find some examples on how to pass the image from OpenCV to Labview.

Best regards,

K