初始化私有静态变量
[英]Initialize private static variable
问题描述
我在使用IDE 1.6.7的arduino M0 pro上，我试图初始化变量，但是出现编译错误：
Arduino : 1.6.7 (Mac OS X), Carte : "Arduino/Genuino Zero (Programming Port)"
Attention: platform.txt du cœur 'Arduino SAMD (32-bits ARM Cortex-M0+) Boards' contiens recipe.ar.pattern="{compiler.path}{compiler.ar.cmd}" {compiler.ar.flags} {compiler.ar.extra_flags} "{build.path}/{archive_file}" "{object_file}" dépassé, converti automatiquement en recipe.ar.pattern="{compiler.path}{compiler.ar.cmd}" {compiler.ar.flags} {compiler.ar.extra_flags} "{archive_file_path}" "{object_file}". La mise a niveau de ce cœur est conseillée.
libraries/shutter_webserver/shutterWebserver.cpp.o: In function _GLOBAL__sub_I__ZN16ShutterWebserverC2Ev':
/Users/pyrotecnix/Documents/Arduino/libraries/shutter_webserver/shutterWebserver.cpp:29: undefined reference to `ShutterWebserver::_handlers'
collect2: error: ld returned 1 exit status
exit status 1
Erreur lors de la compilation.
shutterWebserver.h
#ifndef ShutterWebserver_h
#define ShutterWebserver_h
#include <pins_arduino.h>
#include <SPI.h>
#include <Ethernet.h>
#include <Flash.h>
#include <TinyWebServer.h>
class ShutterWebserver {
public:
/*Constructeur*/
ShutterWebserver();
static void init();
static void run();
static boolean index_handler(TinyWebServer& web_server);
private:
static TinyWebServer::PathHandler _handlers[2];
static TinyWebServer _web;
};
#endif
shutterWebserver.cpp
#include "shutterWebserver.h"
ShutterWebserver::ShutterWebserver() {}
TinyWebServer::PathHandler _handlers[] = {
//Register the index_handler for GET requests on /
{"/", TinyWebServer::GET, &ShutterWebserver::index_handler },
{NULL}, // The array has to be NULL terminated this way
};
TinyWebServer ShutterWebserver::_web = TinyWebServer(_handlers, NULL);
boolean ShutterWebserver::index_handler(TinyWebServer& web_server) {
web_server.send_error_code(200);
web_server << F("<html><body><h1>Hello World!</h1></body></html>\n");
return true;
}
void ShutterWebserver::init() {
}
void ShutterWebserver::run() {
}
2 个解决方案
解决方案1
2 已采纳 2015-12-25 14:34:47
您将必须定义_handlers为
TinyWebServer::PathHandler ShutterWebserver::_handlers[]
代替
TinyWebServer::PathHandler _handlers[]
在shutterWebserver.cpp 。
解决方案2
1 2015-12-25 15:01:48
这个定义
TinyWebServer::PathHandler _handlers[] = {
//Register the index_handler for GET requests on /
{"/", TinyWebServer::GET, &ShutterWebserver::index_handler },
{NULL}, // The array has to be NULL terminated this way
};
声明名称为_handlers的全局变量
如果要定义类数据成员，则必须指定变量的全称。
TinyWebServer::PathHandler ShutterWebserver::_handlers[] = {
//Register the index_handler for GET requests on /
{"/", TinyWebServer::GET, &ShutterWebserver::index_handler },
{NULL}, // The array has to be NULL terminated this way
};
另外最好明确指定数组的大小
TinyWebServer::PathHandler ShutterWebserver::_handlers[2] = {
//Register the index_handler for GET requests on /
{"/", TinyWebServer::GET, &ShutterWebserver::index_handler },
{NULL}, // The array has to be NULL terminated this way
};
因为在类定义中已经明确设置了
//...
private:
static TinyWebServer::PathHandler _handlers[2];
//...
否则，不清楚数组是否确实具有两个元素。
初始化私有静态变量c ++
声明:本站的技术帖子网页，遵循CC BY-SA 4.0协议，如果您需要转载，请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.