cocos2dx 3.x lua 网络加载并且保存资源（unix、linux）

#ifndef __DazzleParkour__TextLoader__

#define __DazzleParkour__TextLoader__

#include <stdio.h>

#include "cocos2d.h"

#include "network/HttpClient.h"

#include "CCLuaValue.h"

using namespace cocos2d::network;

using namespace cocos2d;

using namespace std;

class TextLoader

{

public:

static TextLoader*create(const char* url,const char* requestData,const char* tag,string textName,string savePath,LUA_FUNCTION callback){

TextLoader * instance = new TextLoader();

instance->doHttpRequest(url,requestData,tag,textName,savePath,callback);

return instance;

}

void onHttpRequestImageCompleted(HttpClient *sender, HttpResponse *response);

void doHttpRequest(const char* url,const char* requestData,const char* tag,string textName,string savePath,LUA_FUNCTION callback);

private:

string m_textName;

string m_savePath;

char m_url[500];

LUA_FUNCTION m_callback;

};

#endif

//安卓项目需要获取网络权限

#include <stdio.h>

#include "TextLoader.h"

#include "ImageLoader.h"

#include <sys/types.h>

#include <sys/stat.h>

#include <errno.h>

#include <dirent.h>

#include "CCLuaStack.h"

#include "CCLuaEngine.h"

#include "StringUtils.h"

void TextLoader::onHttpRequestImageCompleted(HttpClient *sender, HttpResponse *response)

{

if (!response)

{

return;

}

const char* tag  =  response->getHttpRequest()->getTag();

if (0 != strlen(tag))

{

log("%s completed", response->getHttpRequest()->getTag());

}

if (!response->isSucceed())

{

log("error buffer: %s", response->getErrorBuffer());

log("error buffer: %s",this->m_url

);

return;

}

//检测当前目录下是否存在保存目录，不存在则创建

DIR *dir = nullptr;

dir = opendir (this->m_savePath.c_str());

if (!dir)

{

vector<string> v;

split(this->m_savePath,v,"/");

string path = FileUtils::getInstance()->getWritablePath();

for (size_t i = 0; i < v.size(); ++ i)

{

path+=v[i];

path+="/";

int ret = mkdir(path.c_str(), S_IRWXU | S_IRWXG | S_IRWXO);

if(ret!=0)

{

log("fail to createDirectory");

}

}

}

string path = FileUtils::getInstance()->getWritablePath()+this->m_textName;

FILE*file=fopen(path.c_str(),"w+");

std::vector<char> *buffer = response->getResponseData();

string data = string(buffer->begin(),buffer->end());

fwrite(data.c_str(), sizeof(char), data.size(), file);

fclose(file);

LuaStack* pStack = LuaEngine::getInstance()->getLuaStack();//调用lua回调函数

//第一个参数是函数的整数句柄，第二个参数是函数参数个数

pStack->clean();

pStack->executeFunctionByHandler(this->m_callback,0);

}

void TextLoader::doHttpRequest(const char* url,const char* requestData,const char* tag,string textName,string savePath,LUA_FUNCTION callback)

{

HttpRequest* request = new HttpRequest();

request->setUrl(url);

request->setRequestType(HttpRequest::Type::POST);

//这是回调对象和回调函数

request->setResponseCallback(CC_CALLBACK_2(TextLoader::onHttpRequestImageCompleted, this));

request->setTag(tag);

//请求的数据

if(strlen(requestData)!=0){

request->setRequestData(requestData,strlen(requestData));

}

HttpClient::getInstance()->send(request);

this->m_textName = textName;

this->m_savePath = savePath;

this->m_callback = callback;

strcpy(this->m_url, url);

//释放内存

request->release();

}

注意：在lua取栈的回调函数需要使用调用

LUA_FUNCTION handler =  toluafix_ref_function(tolua_S,栈位置,0);

TextLoader* ret = TextLoader::create(arg0, arg1, arg2, arg3, arg4, handler);

自带lua打包工具会使用：

bool ok = luaval_to_int32(tolua_S, 7,(int *)&handler, "TextLoader:create");

笔者试过，不可行。