需要帮助格式化字符串输出

Question

vector<data> getList = readContent();
string output = "";
ostringstream conv;
istringstream is;

output += "s: 200 OK\nThe list of records in the book:\n";

for(int j = 0; j < getList.size(); j++)
{
 conv << getList[j].record;

 output += conv.str();
 output += "     ";
 output += getList[j].fName;
 output += " ";
 output += getList[j].lName;
 output += "     ";
 output += getList[j].phoneNum;
 output += "   \n";

 conv.str("");
}

send(s, (char *)output.c_str(), strlen((char *)output.c_str()), 0);

readContent() returns a vector containing all the data that is read from a file. This is printing everything that is in the vector. However, I cannot figure out how to format the each thing in a vector in a specific way:

record starts 0 spaces from left side
fName starts 10 spaces from left side
lName starts right after a space that is after fName
phoneNum starts 30 spaces from left side

all in 1 line. Here is a picture example (can't format on this thread editor...)

http://i.imgur.com/bbAlDWX.png

I understand this can be done using setw(), but thats only when you're directly outputting by using the << operators (or am I wrong?). It needs to be in a form of a string so I can send it to the client through a socket.

Does anyone know what I can do?

Answer 1

#include <iomanip> and use all of its tools.

You can build a string in the same way you'd output with cout if you #include <sstream> and use stringstreams

stringstream ss;
ss << //do stuff the same way you'd cout
return ss.str(); //or whatever you need to do with the built string