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Difference "Migrating to CppCMS 1.x.x." ver. 6 versus ver. 7

Content:

## Introduction
In this article we would describe the process of migration of the code-base to new CppCMS version. How to do it in painless way? What should you care of and so on.
## Why to migrate?
Many reasons:
- CppCMS 1.x.x release expects much longer life-time support, providing binary backward compatibility.
- Localization in CppCMS make significant step forward, including decent support based on ICU library.
- New version provides support of Comet applications and event driven programming support.
- Simplifies development providing internal HTTP server.
- Provides full Win32 support.
- Provides great range of supported compilers: Gnu Compilers Collection, Microsoft Visual C++ 2008, Intel Compiler and Sun Studio 12.
- It removes dependencies on low quality CgiCC library that makes CppCMS interfaces inconsistent and removes dependency on specific Boost version.
## How to migrate?
### Main program
The main program changed completely.
It is best to rewrite it according the first [Tutorial](/wikipp/en/page/cppcms_1x_tut_hello).
### Templates
Namespaces or now called skins. So change
<% namespace view %>
<% end namespace %>
to something like
<% skin my_skin %>
<% end skin %>
Classes are now called views. So change
<% class master uses data::message %>
<% end class %>
to something like
<% view master uses content::message %>
<% end view %>
To output content, the syntax now changed from
<% foo %>
to
<%= foo %>
### Includes
The data (content) holder now needs to be changed to include
#include <cppcms/view.h>
instead of
#include <cppcms/base_view.h>
The applications now have as constructor
my_app (cppcms::service &srv);
instead of
my_app (cppcms::worker_thread &worker);
You need to include:
#include <cppcms/applications_pool.h>
#include <cppcms/service.h>
#include <cppcms/http_response.h>
instead of the cgicc headers:
#include <cgicc/HTTPHeader.h>
#include <cgicc/HTTPStatusHeader.h>
### Configuration
To access configuration you now use:
settings().get("").
instead of:
app.config.sval("")
Unfortunately settings() is not const, so you need to unconst your methods or use an ugly const_cast like:
cppcms::json::value config =
const_cast<my_app*>(this)->settings();
The configuration file format also has completely changed.
So you may want to start with a new configuration file.
### Cgicc
CppCMS 1.0.0 does not use CgiCC any more (CgiCC allows to start CppCMS easily but it wasn't really good library in long term).
Now you use [cppcms::http::request](http://cppcms.com/cppcms_ref/latest/classcppcms_1_1http_1_1request.html)
To access the query string you now can use:
request().query_string()
instead of:
env->getQueryString()
To decode URLs you can use
#include <cppcms/util.h>
cppcms::util::urldecode(url)
instead of:
cgicc::form_urldecode(url)
To set an http content header you can use:
response().set_content_header("text/xml");
instead of:
cgicc::HTTPHeader* hdr = new cgicc::HTTPContentHeader("text/xml");
set_header(hdr);
To add some other kind of header (e.g. for redirection) you can use (nginx):
response().set_header("X-Accel-Redirect", file);
instead of
add_header("X-Accel-Redirect: " + file);
### URL Remapping
To bind urls to a method, you now include:
#include <cppcms/url_dispatcher.h>
#include <cppcms/url_mapper.h>
and then you can use:
dispatcher().assign("^/?(.*?)/?$",&hello::execute,this,1);
mapper().assign("{1}");
instead of
url.add("^/?(.*?)/?$", boost::bind(&hello::execute, this, _1));
To change the default skin in cppcms 1.0 you can now use:
skin("my_skin")
instead of:
To change the default skin for a specific context in cppcms 1.0 you can now use:
context().skin("my_skin")
instead of the previous application-global setting:
use_template("view");

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