cocos2d-x学习篇之计时器
Cocos2d-x学习篇之简单的时钟
由于C++很菜，在做这个小工具时遇到各种各样蛋疼的问题，甚至准备放弃了，不过，最后还是搞出来了，真尼玛不容易啊。
刚开始想，显示本地时间不是很容易吗，取计算机的当前时间拼接成字符串显示在CCLabelTTF的实例上不就行了吗，几分钟的事，结果整整搞了一天。
首先，cocos2d-x不支持汉字显示，也就是不支持Unicode编码，从网上找了方法来转换一下，如下：
#ifndef CHINESE_H
#define CHINESE_H
#define _GLIBCXX_USE_WSTRING
#include "iostream"
#include "string"
using namespace std;
class Chinese
{
//! convert from wstring to UTF8 using self-coding-converting
public:
inline void WStrToUTF8(std::string& dest, const wstring& src){
dest.clear();
for (size_t i = 0; i < src.size(); i++){
wchar_t w = src[i];
if (w <= 0x7f)
dest.push_back((char)w);
else if (w <= 0x7ff){
dest.push_back(0xc0 | ((w >> 6)& 0x1f));
dest.push_back(0x80| (w & 0x3f));
}
else if (w <= 0xffff){
dest.push_back(0xe0 | ((w >> 12)& 0x0f));
dest.push_back(0x80| ((w >> 6) & 0x3f));
dest.push_back(0x80| (w & 0x3f));
}
else if (sizeof(wchar_t) > 2 && w <= 0x10ffff){
dest.push_back(0xf0 | ((w >> 18)& 0x07)); // wchar_t 4-bytes situation
dest.push_back(0x80| ((w >> 12) & 0x3f));
dest.push_back(0x80| ((w >> 6) & 0x3f));
dest.push_back(0x80| (w & 0x3f));
}
else
dest.push_back('?');
}
}
//! simple warpper
inline std::string chineseStr(const std::wstring& str){
std::string result;
WStrToUTF8(result, str);
return result;
}
BOOL StringToWString(const std::string &str,std::wstring &wstr)
{
int nLen = (int)str.length();
wstr.resize(nLen,L' ');
int nResult = MultiByteToWideChar(CP_ACP,0,(LPCSTR)str.c_str(),nLen,(LPWSTR)wstr.c_str(),nLen);
if (nResult == 0)
{
return FALSE;
}
return TRUE;
}
//wstring高?字Á?节¨²不?为a0，ê?返¤¦Ì回?FALSE
BOOL WStringToString(const std::wstring &wstr,std::string &str)
{
int nLen = (int)wstr.length();
str.resize(nLen,' ');
int nResult = WideCharToMultiByte(CP_ACP,0,(LPCWSTR)wstr.c_str(),nLen,(LPSTR)str.c_str(),nLen,NULL,NULL);
if (nResult == 0)
{
return FALSE;
}
return TRUE;
}
};
#endif
接下来就是要显示了，首先说一下自己的错误思路，在文本框中显示并更新字符串，用个死循环每隔1s刷新时间就好了，所以写了个死循环放在HelloWorldScene.cpp中的init()方法中，运行下看看，结果尼玛，坑爹啊，界面都不出来了，看了下main中的代码，感觉可能是先执行死循环在执行run()方法的，就显示不出来，好吧，放在main中不就行了，不过这样的话显示的方法showInfo()就需要一个参数了，对，就是那个CCLabelTTF的实例，所以就写了下面的代码：
void showInfo(CCLabelTTF* label)
{
time_t t;
time(&t);
while(true)
{
Sleep(1000);
tm* t_tm = localtime(&t);
char year[6];
_itoa(t_tm->tm_year + 1900, year, 10);
char month[4];
_itoa(t_tm->tm_mon + 1, month, 10);
char day[6];
_itoa(t_tm->tm_mday, day, 10);
char hour[4];
_itoa(t_tm->tm_hour, hour, 10);
char minuter[4];
_itoa(t_tm->tm_min, minuter, 10);
char second[4];
_itoa(t_tm->tm_sec, second, 10);
Chinese ch;
wstring w_str;
ch.StringToWString(string(year) + "年" + string(month) + "月" + string(day) + "日" + string(hour) + "时" + string(minuter) + "分" + string(second) + "秒", w_str);
string result = ch.chineseStr(w_str);
label->setString(result.c_str());
}
}
不过这个方法要初始化一下啊，不然时间往哪显示去，好吧，在HelloWorldScene.cpp中定义显示的文本框是初始化下，结果尼玛，毫无疑问的又出现问题了，为什么？showInfo()中有死循环，一初始化就执行死循环了。
后来想了想，应该先让界面运行出来了再执行死循环，因此改了下main.cpp的代码，又想显示代码的文本应该是唯一的，不然可能会出现问题，so弄个单例来单独处理显示：
#ifndef _TIME_SHOW
#define _TIME_SHOW
#include "AppDelegate.h"
#include "CCEGLView.h"
#include "windows.h"
#include "Chinese.h"
#pragma once
USING_NS_CC;
class TimeShow
{
public:
~TimeShow(void);
static TimeShow* getInstance()
{
if(_instance == NULL)
{
_instance = new TimeShow();
}
return _instance;
}
void showInfo()
{
time_t t;
time(&t);
while(true)
{
Sleep(1000);
tm* t_tm = localtime(&t);
char year[6];
_itoa(t_tm->tm_year + 1900, year, 10);
char month[4];
_itoa(t_tm->tm_mon + 1, month, 10);
char day[6];
_itoa(t_tm->tm_mday, day, 10);
char hour[4];
_itoa(t_tm->tm_hour, hour, 10);
char minuter[4];
_itoa(t_tm->tm_min, minuter, 10);
char second[4];
_itoa(t_tm->tm_sec, second, 10);
Chinese ch;
wstring w_str;
ch.StringToWString(string(year) + "年" + string(month) + "月" + string(day) + "日" + string(hour) + "时" + string(minuter) + "分" + string(second) + "秒", w_str);
string result = ch.chineseStr(w_str);
label->setString(result.c_str());
}
}
void setLabel(CCLabelTTF* _label)
{
label = _label;
}
private:
CCLabelTTF* label;
static TimeShow* _instance;
TimeShow(void);
};
#endif
这样，在初始化文本框后调用下setLabel()即可，真是黄金大脑啊。
OK，运行一下，尼玛就出现这个问题：
什么原因呢？可能是单例的写法有问题，网上查了下，没错啊，就是这么写的，又查了下报的这个错误，有人说静态变量应该在头文件中初始化下，好吧，在#endif前加上一句TimeShow* TimeShow::_instance = NULL;
F5一下，尼玛又报错：
坑爹啊，又上网查找，半天没找到原因，想想以前学C++的时候，初始化都是放在cpp文件中的，将声明剪切到TimeShow.cpp中：
#include "TimeShow.h"
TimeShow* TimeShow::_instance = NULL;
TimeShow::TimeShow(void)
{
}
TimeShow::~TimeShow(void)
{
}
F5下，哇，终于没有上面的错误了，尼玛瞬间泪流满面，感慨万分。可是0.01s后，又悲剧了，没有编译错误，运行错误出来了：
没事，万事有google，搜搜更健康，我擦，网上的说法五花八门，想想，可能是setLabel的时候传过来的那个指针有问题，没办法了，先看看别人怎么实现的吧，搜索下cocos2d-x显示本地时间，尼玛，自带三种定时器，卧槽，我简直是自虐啊，完全找死的节奏，人家都写好了，自己还傻不拉几的去用死循环。
好吧，不作死就不会死，研究下API，管它那个好呢，先实现再说，
this->scheduleUpdate();
这个简单，没有参数，只需要在头文件中定义update()方法然后实现就OK了，
virtual void update(float data);
为什么用virtual？其实我也不知道，我只知道virturl声明的方法在类的继承和多态中会调用相应子类的对应方法，我这又没继承。Update()的实现如下：
void HelloWorld::update(float data)
{
//CCLog("update");
time_t t;
time(&t);
tm* t_tm = localtime(&t);
char year[6];
_itoa(t_tm->tm_year + 1900, year, 10);
char month[4];
_itoa(t_tm->tm_mon + 1, month, 10);
char day[6];
_itoa(t_tm->tm_mday, day, 10);
char hour[4];
_itoa(t_tm->tm_hour, hour, 10);
char minuter[4];
_itoa(t_tm->tm_min, minuter, 10);
char second[4];
_itoa(t_tm->tm_sec, second, 10);
Chinese ch;
wstring w_str;
ch.StringToWString(string(year) + "年¨º" + string(month) + "月?" + string(day) + "日¨?" + string(hour) + "时º¡À" + string(minuter) + "分¤?" + string(second) + "秒?", w_str);
string result = ch.chineseStr(w_str);
label->setString(result.c_str());
}
其实这个很简单了，就是取本地时间转化为字符串显示在文本框上，这个label是哪的呢？刚开始想肯定需要个全局变量，放在.h文件中可能好点，
CCLabelTTF* label;
发现又报错：
结果只好放在.cpp中了，为什么会这样，我不会，坐等大神解释。
F5下，苍天啊大地啊，终于见到想要的结果了，55555~~~~
最后觉得scheduleUpdate()是每帧执行一次的话可能太浪费了，改成每秒：
this->schedule(schedule_selector(HelloWorld::update), 1.0);
最后的效果如下：
附：完整的HelloWorldScene.cpp的代码如下：
#include "HelloWorldScene.h"
#include "string"
#include "Chinese.h"
#include "windows.h"
#include "TimeShow.h"
USING_NS_CC;
using namespace std;
CCLabelTTF* label;
CCScene* HelloWorld::scene()
{
// 'scene' is an autorelease object
CCScene *scene = CCScene::create();
// 'layer' is an autorelease object
HelloWorld *layer = HelloWorld::create();
// add layer as a child to scene
scene->addChild(layer);
// return the scene
return scene;
}
// on "init" you need to initialize your instance
bool HelloWorld::init()
{
//////////////////////////////
// 1. super init first
if ( !CCLayer::init() )
{
return false;
}
CCSize visibleSize = CCDirector::sharedDirector()->getVisibleSize();
CCPoint origin = CCDirector::sharedDirector()->getVisibleOrigin();
/////////////////////////////
// 2. add a menu item with "X" image, which is clicked to quit the program
// you may modify it.
// add a "close" icon to exit the progress. it's an autorelease object
CCMenuItemImage *pCloseItem = CCMenuItemImage::create(
"CloseNormal.png",
"CloseSelected.png",
this,
menu_selector(HelloWorld::menuCloseCallback));
pCloseItem->setPosition(ccp(origin.x + visibleSize.width - pCloseItem->getContentSize().width/2 ,
origin.y + pCloseItem->getContentSize().height/2));
// create menu, it's an autorelease object
CCMenu* pMenu = CCMenu::create(pCloseItem, NULL);
pMenu->setPosition(CCPointZero);
this->addChild(pMenu, 1);
/////////////////////////////
// 3. add your codes below...
// add a label shows "Hello World"
// create and initialize a label
CCLabelTTF* pLabel = CCLabelTTF::create("Hello World", "Arial", 24);
CCLabelTTF* pLabel_0 = CCLabelTTF::create("Hello Baby", "Courier New", 18);
CCNode* node = CCNode::create();
this->addChild(node, 0);
//node->convertToNodeSpace()
// position the label on the center of the screen
pLabel->setPosition(ccp(origin.x + visibleSize.width/2,
origin.y + visibleSize.height - pLabel->getContentSize().height));
pLabel_0->setPosition(ccp(origin.x + visibleSize.width/2 + 30, origin.y + visibleSize.height - pLabel_0->getContentSize().height));
label = pLabel_0;
// add the label as a child to this layer
// this->addChild(pLabel, 1);
//TimeShow::getInstance()->setLabel(pLabel_0);
// add "HelloWorld" splash screen"
CCSprite* pSprite = CCSprite::create("HelloWorld.png");
CCSprite* pGirl = CCSprite::create("girl.jpg");
node->addChild(pGirl, 0);
pGirl->setPosition(ccp(visibleSize.width / 2 + origin.x, visibleSize.height / 2 + origin.y));
// position the sprite on the center of the screen
pSprite->setPosition(ccp(visibleSize.width/2 + origin.x, visibleSize.height/2 + origin.y));
//pGirl->setPosition(ccp(0, 0));
node->addChild(pLabel_0, 1);
// add the sprite as a child to this layer
//this->addChild(pSprite, 0);
//this->scheduleUpdate();
this->schedule(schedule_selector(HelloWorld::update), 1.0);
//TimeShow::getInstance()->showInfo();
return true;
}
void HelloWorld::update(float data)
{
//CCLog("update");
time_t t;
time(&t);
tm* t_tm = localtime(&t);
char year[6];
_itoa(t_tm->tm_year + 1900, year, 10);
char month[4];
_itoa(t_tm->tm_mon + 1, month, 10);
char day[6];
_itoa(t_tm->tm_mday, day, 10);
char hour[4];
_itoa(t_tm->tm_hour, hour, 10);
char minuter[4];
_itoa(t_tm->tm_min, minuter, 10);
char second[4];
_itoa(t_tm->tm_sec, second, 10);
Chinese ch;
wstring w_str;
ch.StringToWString(string(year) + "年¨º" + string(month) + "月?" + string(day) + "日¨?" + string(hour) + "时º¡À" + string(minuter) + "分¤?" + string(second) + "秒?", w_str);
string result = ch.chineseStr(w_str);
label->setString(result.c_str());
}
void onEnter()
{
}
void HelloWorld::menuCloseCallback(CCObject* pSender)
{
#if (CC_TARGET_PLATFORM == CC_PLATFORM_WINRT) || (CC_TARGET_PLATFORM == CC_PLATFORM_WP8)
CCMessageBox("You pressed the close button. Windows Store Apps do not implement a close button.","Alert");
#else
CCDirector::sharedDirector()->end();
#if (CC_TARGET_PLATFORM == CC_PLATFORM_IOS)
exit(0);
#endif
#endif
}
唉！路漫漫其修远兮，吾将上下而求索！
