Read unsigned chars into string

Question

I have an array of unsigned chars:

unsigned char buffer[BUFFER_SIZE];

I want to read in the first N unsigned chars from that array into a string however after looking at strncpy(), that seems to only take pointers to signed chars.

Should I be looking at memcpy()?

What is the format of the buffer? Is all full or half empty? All values are have the same size? **What have you tryied**? — PaperBirdMaster, Oct 16 '12 at 07:06
@PaperBirdMaster- Bad Comment man. Doesn't makes sense to me. The question is simple and self-explanatory. — Abhineet, Oct 16 '12 at 07:26

score 1 · Accepted Answer · edited May 23 '17 at 12:18

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Not sure about the exact syntax but, if possible, you should use:

reinterpret_cast<char *>(buffer[i]);

Also see:

Is there a good way to convert from unsigned char* to char*?

edited May 23 '17 at 12:18

Community

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answered Oct 16 '12 at 07:12

jt234

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score 0 · Answer 2 · answered Oct 16 '12 at 07:06

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strcmp and memcmp compare data, they don't copy it...

Anyway, just cast to char * and use whatever stdlib function makes sense.

answered Oct 16 '12 at 07:06

zmbq

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score 0 · Answer 3 · answered Oct 16 '12 at 07:52

If by string you mean a char array, the simplest way in c++ is just to use std::copy, no need to cast anything:

unsigned char buffer[BUFFER_SIZE];
char dest[BUFFER_SIZE]

std::copy( buffer, buffer + N, dest );

If you mean a std::string, just use the iterator style constructor:

std::string dest( buffer, buffer + N );

Read unsigned chars into string

3 Answers3