CppCMS教程:静态链接模板错误(控制器问题)

CppCMS tutorial: Linking template statically error (controller issue)

本文关键字:错误 控制器 问题 教程 静态 链接 CppCMS      更新时间:2023-10-16

From http://cppcms.com/wikipp/en/page/cppcms_1x_tut_hello_templates#The.controller

我在hello.cpp的底部放置了以下代码:

virtual void main(std::string /*url*/)
{
    content::message c;
    c.text=">>>Hello<<<";
    render("message",c);
}

运行g++ hello.cpp my_skin.cpp -o hello -lcppcms -lbooster时,得到错误:

hello.cpp:44:38: error: ‘virtual’ outside class declaration
hello.cpp:44:38: error: ‘::main’ must return ‘int’
hello.cpp:44:14: warning: first argument of ‘int main(std::string)’ should be ‘int’ [-Wmain]
hello.cpp:44:14: warning: ‘int main(std::string)’ takes only zero or two arguments [-Wmain]
hello.cpp: In function ‘int main(std::string)’:
hello.cpp:44:38: error: declaration of C function ‘int main(std::string)’ conflicts with
hello.cpp:27:5: error: previous declaration ‘int main(int, char**)’ here
hello.cpp: In function ‘int main(std::string)’:
hello.cpp:48:23: error: ‘render’ was not declared in this scope

我错过了什么吗

错误信息告诉了你需要知道的一切。

  1. virtual只能在一个类中使用。你的主方法不在类中。
  2. main方法必须返回int。您的返回void
  3. 有两个主要方法,一个是main(std::string),另一个是main(int, char**)
  4. 你的渲染方法必须在主方法上面有一个函数原型,否则整个方法需要移动。

所以这样更合适:

void render(std::string, std::string) // or whatever
{
   // do something
}
int main(int argc, char** argv)
{
   render("string", c);
   return 0;
}

您的hello.cpp应该如下所示:

#include <cppcms/application.h>
#include <cppcms/applications_pool.h>
#include <cppcms/service.h>
#include <cppcms/http_response.h>
#include <iostream>
#include "content.h"
class hello : public cppcms::application {
public:
    hello(cppcms::service &srv) : cppcms::application(srv) {}
    virtual void main(std::string url);
};
void hello::main(std::string /*url*/){
    content::message cc;
    cc.text=">>>Hello<<<";
    render("message", cc);
}
int main(int argc,char ** argv){
    try {
        cppcms::service srv(argc,argv);
        srv.applications_pool().mount(cppcms::applications_factory<hello>());
        srv.run();
    }
    catch(std::exception const &e) {
        std::cerr<<e.what()<<std::endl;
    }
}