How to convert data in array to string c++

Question

I have arrays which contains either 1 or 0. I would like to append it and become one line string. At the moment I had failed doing so. here is my code. Please help because I could not manage to complete it. Everytime I load the final result to the console, only smiley faces and not 1 or 0. Please help

int pixelValueArray[256];
String testing;

for(int d=0;d<256;d++)
{
    testing.append(1,pixelValueArray[d]);
}

cout<<testing;

The ASCII code for character "0" is 48. Instead of writing the number 48, it's a good idea to write the more self-documenting '0'. — Cheers and hth. - Alf
– Cheers and hth. - Alf, Commented Apr 15, 2015 at 8:26
Hi, actually I wanted to use the string for my ANN in opencv. The string must be converted to this cv::Mat data(1,ATTRIBUTES,CV_32F). Is there any way that the data inside the array can be converted to the MAT data? — Maz Ahmad
– Maz Ahmad, Commented Apr 15, 2015 at 8:30

Arpegius · Accepted Answer · 2015-04-15 09:24:00Z

2

Std provides the function std::to_string() (since c++11) to convert Datatypes like int to std::string: http://en.cppreference.com/w/cpp/string/basic_string/to_string . Maybe this can help you.

edited Apr 15, 2015 at 9:24

Arpegius

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answered Apr 15, 2015 at 8:42

kylecorver

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Comments

Aakash Jain · Accepted Answer · 2015-04-15 09:08:14Z

1

The ASCII values for integer digits are given by '0' + digit.

for(int i = 0; i < 256; i++)
    testing.append(1, '0' + pixelValueArray[i]);

Or you could use the simpler +=

for(int i = 0; i < 256; i++)
    testing += '0' + pixelValueArray[i];

answered Apr 15, 2015 at 9:08

Aakash Jain

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2 Comments

Maz Ahmad Over a year ago

Thanks so much ... BTW I had used the string to convert to MAT but got error by using this... Do u have any thought on this?

Maz Ahmad Over a year ago

for(int d=0;d<256;d++) { testing += '0' + pixelValueArray[d]; } cout<<testing; //this is the string cv::Mat data(1,ATTRIBUTES,CV_32F,testing.data());

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