stringstream is a handy class that operates on strings. You can think it a file loaded into something resembling a string, or alternatively as a sort of string that you can write to and read from like a file. It’s not exactly either of those things, but its a simplified explanation.<\/p>\n\n\n\n
#include <sstream>\n\t\n\tstringstream ss1;\n\tss1 << \"Hello, value is \" << myInt;\n\tss1 << \" total\";\n\n\t\/\/To pass the stringstream to a string:\n\tstring s1 = ss1.str();\n\n\t\/\/To pass the stringstream to a char*:\n\tstring s1 = ss1.str().c_str();<\/code><\/pre>\n\n\n\nUsing variables is a stringstream<\/h4>\n\n\n\n#include <sstream>\n\t\n\tstringstream ss1;\n\tint myInt = 54;\n\tdouble myDouble = 1.234;\n\tss1 << \"The int is \" << myInt;\n\tss1 << \", and the double is \" << myDouble;\t\t\/\/You can add to a stringstream like this<\/code><\/pre>\n\n\n\nBYTE – note you need to use (int) in front of BYTE values, they are not handled correctly without it!<\/em><\/p>\n\n\n\nConverting a stringstream into a value<\/h4>\n\n\n\n#include <sstream>\n\n\tstringstream ss1;\n\tint my_value;\n\t\/\/float my_value;\n\t\/\/double my_value;\n\tss1 << \"1.234\";\n\tss1 >> my_value;\t\t\/\/Will convert to int, float, double<\/code><\/pre>\n\n\n\nClear stringstream<\/h4>\n\n\n\n
You need to use both of these (or just create a new stringstream of course):<\/p>\n\n\n\n
\tss1.clear();\n\tss1.str(std::string());\n\n\n\tss1.clear();\t\t\t\t\/\/Resets the internal error flags (if not called the stringstream object may think it's in an error state (such as EOF), even if the underlying string has been changed).\n\tss1.str(std::string());\t\t\/\/Clear out the old string. A bit faster than using: ss1.str(\"\")<\/code><\/pre>\n\n\n\nByte uint8_t values<\/h4>\n\n\n\n
You need to add (int) in front of byte or char values to get them to convert otherwise they will be dealt with as a character (char)<\/p>\n\n\n\n
\tss1 << (int)my_byte_value;<\/code><\/pre>\n\n\n\nLength<\/h4>\n\n\n\n\tss1.str().length<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"stringstream is a handy class that operates on strings. You can think it a file loaded into something resembling a string, or alternatively as a sort of string that you can write to and read from like a file. It’s not exactly either of those things, but its a simplified explanation. An example of a stringstream Using […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[141],"tags":[],"class_list":["post-2019","post","type-post","status-publish","format-standard","hentry","category-stringstream"],"_links":{"self":[{"href":"https:\/\/raspberry-projects.com\/pi\/wp-json\/wp\/v2\/posts\/2019","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/raspberry-projects.com\/pi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/raspberry-projects.com\/pi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/raspberry-projects.com\/pi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/raspberry-projects.com\/pi\/wp-json\/wp\/v2\/comments?post=2019"}],"version-history":[{"count":9,"href":"https:\/\/raspberry-projects.com\/pi\/wp-json\/wp\/v2\/posts\/2019\/revisions"}],"predecessor-version":[{"id":3330,"href":"https:\/\/raspberry-projects.com\/pi\/wp-json\/wp\/v2\/posts\/2019\/revisions\/3330"}],"wp:attachment":[{"href":"https:\/\/raspberry-projects.com\/pi\/wp-json\/wp\/v2\/media?parent=2019"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/raspberry-projects.com\/pi\/wp-json\/wp\/v2\/categories?post=2019"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/raspberry-projects.com\/pi\/wp-json\/wp\/v2\/tags?post=2019"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}