whole char array into string as int

hi,

I'm wanting to find out a way to display/convert a whole char array or string into int, such that their hex values are displayed & not characters. I know how to do this, but I'm wanting to find out if there's a way to do it in one pass & not byte by byte

For example, the following does it one at a time, which is fine for small strings, but not for large data blocks.

Code:

char Temp[32];
unsigned char* pbuffer = somedata;
string str;
	for(int i=0; i< Charsize;i++)
	{
	        sprintf(Temp,"%02x ",pbuffer[i]);
		str +=Temp;
	}

I'm after more something like this:

Code:

unsigned char *pbuffer = "The quick brown fox jumps over the lazy dog";
std::string szStringConvert2Int(pbuffer);

Where this would convert & store int values in one go into szString or something like along these lines.

Originally Posted by Tropod

I'm after more something like this:

Code:

unsigned char *pbuffer = "The quick brown fox jumps over the lazy dog";
std::string szStringConvert2Int(pbuffer);

Where this would convert & store int values in one go into szString or something like along these lines.

What you are after looks like a constructor for std::string that will do this. There isn't a standard one like that, and I don't think writing a whole class is necessary, just write a stringConvert2Int function in a similar vein to what you already have.

Why is it not fine for large blocks?
IIRC, those std::string operator+=() calls in there are amortised constant time just like for a vector.

I would use a stringstream myself, casting each unsigned char to an int and using the std::hex modifier on the stream. But I would not expect it to be a lot faster than the above. Not that I would expect anythign else to be a lot faster either.