std::string formatting like sprintf

Question

I have to format std::string with sprintf and send it into file stream. How can I do this?

Answer 1

This is the code I use to do this in my program... It's nothing fancy, but it does the trick... Note, you will have to adjust your size as applicable. MAX_BUFFER for me is 1024.

std::string Format ( const char *fmt, ... )
{
    char textString[MAX_BUFFER*5] = {'\0'};

    // -- Empty the buffer properly to ensure no leaks.
    memset(textString, '\0', sizeof(textString));

    va_list args;
    va_start ( args, fmt );
    vsnprintf ( textString, MAX_BUFFER*5, fmt, args );
    va_end ( args );
    std::string retStr = textString;
    return retStr;
}