How to convert a string to unsigned char array in c++

Question

string temp;
temp = line.substr(0, pos);

I need to convert the string temp to an unsigned char array. Could someone please tell me how this can be done? I tried the methods mentioned in the below link but they didn't work.

How to convert a string literal to unsigned char array in visual c++

unsigned char* val=new[temp.size() + 1](); //Error: Expected a type.
copy(temp.begin(), temp.end(), val);

if you just need access to the underlying char array you can use .c_str() but that doesn't guarantee unsigned. Why don't the methods in that other question work for you? — Ryan Haining
– Ryan Haining, Commented Feb 18, 2015 at 17:54
Just to be sure, you want an unsigned char array, right? Not just an unsigned char? — Qaz
– Qaz, Commented Feb 18, 2015 at 17:55
What exactly are you trying to get out of this "conversion"? If the string is "abcde", what should be the result? — T.C.
– T.C., Commented Feb 18, 2015 at 17:55

Martin Schlott · Accepted Answer · 2015-02-18 18:14:17Z

10

It is ugly to put a string in a raw unsigned char buffer and you should not do that, but this is stack overflow and we have to answer.

unsigned char *val=new unsigned char[temp.length()+1];
strcpy((char *)val,temp.c_str());

edited Feb 18, 2015 at 18:14

answered Feb 18, 2015 at 18:08

Martin Schlott

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3 Comments

aries Over a year ago

why is it ugly? Can you please tell me a better way to do? I have Vector<uchar> colors. I am getting strings by reading the file. I need to insert these string into "colors". please tell me if there is a cleaner way to achieve this.

Martin Schlott Over a year ago

@aries It is ugly to put a string in a unsigned char array. You should use std::vector. The answer is okay, your question implies that you want to do something which will not be okay. (But you didn't tell)

Martin Schlott Over a year ago

@aries Get the code running with the piece I provided. Then ask a new question how to do it better. Your question in the comment exceed what a comment should provide in the first place. It should be part of the question (with more code).

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