Question

I have a string that looks like this:

str = "751CEC132EB348978013CE7AF8375137"

It is 32 characters long. I want to modify it to look like this:

{0x751CEC13,0x2EB34897,0x8013CE7A,0xF8375137}

I know that if I can split up the string into 4 groups (8 characters each) I can easily construct the required string using those groups and a stringstream.

An easy way to do this in python would be to do this:

'{0x%s,0x%s,0x%s,0x%s}'%(str[0:8],str[8:16], str[16:24], str[24:32])

How can I do this in C++? I’m not very familiar with the low level functions like “sscanf” but they sound like they could come in handy.

Answer 1

string strarray[4];
strarray[0] = "0x" + str.substr(0, 8);
strarray[1] = "0x" + str.substr(8, 8);
strarray[2] = "0x" + str.substr(16, 8);
strarray[3] = "0x" + str.substr(24, 8);

If the {0x751CEC13,0x2EB34897,0x8013CE7A,0xF8375137} is a whole string, then use the following lines instead:

ostringstream strm;
strm << "{" << "0x" << str.substr(0, 8) << ",0x" << str.substr(8, 8)
            << ",0x" << str.substr(16, 8) << ",0x" << str.substr(24, 8) << "}";
str = strm.str();