This is a simple 2-pages application demonstrating QS macro usage to get a value provided by client in the query string.
QS works with all popular HTTP methods and payload types.
npp_app.cpp
void npp_app_main()
{
if ( REQ("") ) // landing page
{
OUT_HTML_HEADER; // generic HTML header with opening body tag
OUT("<h1>%s</h1>", NPP_APP_NAME);
OUT("<h2>Welcome to my web app!</h2>");
/* show client type */
if ( REQ_DSK )
OUT("<p>You're on desktop, right?</p>");
else if ( REQ_TAB )
OUT("<p>You're on tablet, right?</p>");
else /* REQ_MOB */
OUT("<p>You're on the phone, right?</p>");
/* link to welcome */
OUT("<p>Click <a href=\"/welcome\">here</a> to try my welcoming bot.</p>");
OUT_HTML_FOOTER; // body and html closing tags
}
else if ( REQ("welcome") ) // welcoming bot
{
OUT_HTML_HEADER;
OUT("<h1>%s</h1>", NPP_APP_NAME);
/* display form */
OUT("<p>Please enter your name:</p>");
OUT("<form action=\"welcome\"><input name=\"name\" autofocus> <input type=\"submit\" value=\"Run\"></form>");
/* try to get the query string value */
QSVAL qs_name; // query string value
if ( QS("name", qs_name) ) // if present, bid welcome
OUT("<p>Welcome %s, my dear friend!</p>", qs_name);
OUT("<p><a href=\"/\">Back to landing page</a></p>");
OUT_HTML_FOOTER;
}
else // page not found
{
RES_STATUS(404);
}
}