从long到char向http请求中添加一个值

Question

I am trying to to add value in to the http request and getting errors when I add a long into the path.

   long test1, test2;
   unsigned long age;

   numdata=inet.httpGET("test.com", 80, '/system/get.php?value1='+test1+'&value2='+test2, msg, 50);

error: invalid conversion from 'long int' to 'const char*'

And I have tried the following and getting an error.

const char getRequest = '/system/get.php?value1='+test1+'&value2='+test2;
numdata=inet.httpGET("test.com", 80, getRequest, msg, 50);

And am getting the following error

error: invalid conversion from 'char' to 'const char*'

Answer 1

If would be better to use a ostringstream for this

#include <sstream>
std::ostringstream ss;
ss << "/system/get.php?value1=" << test1 << "&value2=" << test2;

then you can get at the std::string from the string stream using

ss.str();

Whatever you choose you should use " instead of single quotes when dealing with a char array. Use only single quotes when dealing with a single char variable.

What you are currently doing here

const char getRequest = '/system/get.php?value1='+test1+'&value2='+test2;

is declaring a const char - that is a single constant character. This is not the same as an array of char .