cocos2dx 3.x getStringFromFile lua 讀取二進制文件

問題所在：爲什麼要用getStringFromFile 獲取的字符串，getDataFromFile沒有導出給lua,quick以前的HelpFunc:getFileData在3.10上暫時用不了，所以修改這個來處理，getStringFromFile沒有處理 \0 問題，所以在長度上有問題，用 getDataFromFile 然後 push給lua時加一個長度就行了

修改文件： lua_cocos2dx_manual.cpp

修改前

static int tolua_cocos2dx_FileUtils_getStringFromFile(lua_State* tolua_S)
{
    if (nullptr == tolua_S)
        return 0;
    
    int argc = 0;
    FileUtils* self = nullptr;
    bool ok = true;
    
#if COCOS2D_DEBUG >= 1
    tolua_Error tolua_err;
    if (!tolua_isusertype(tolua_S,1,"cc.FileUtils",0,&tolua_err)) goto tolua_lerror;
#endif
    
    self = static_cast<FileUtils *>(tolua_tousertype(tolua_S,1,0));
    
#if COCOS2D_DEBUG >= 1
    if (nullptr == self)
    {
		tolua_error(tolua_S,"invalid 'self' in function 'tolua_cocos2dx_FileUtils_getStringFromFile'\n", nullptr);
		return 0;
	}
#endif
    
    argc = lua_gettop(tolua_S) - 1;
    
    if (1 == argc)
    {
        const char* arg0;
        std::string arg0_tmp; ok &= luaval_to_std_string(tolua_S, 2, &arg0_tmp, "cc.FileUtils:getStringFromFile"); arg0 = arg0_tmp.c_str();
        if (ok)
        {
            std::string fullPathName = FileUtils::getInstance()->fullPathForFilename(arg0);
            __String* contentsOfFile = __String::createWithContentsOfFile(fullPathName.c_str());
            if (nullptr != contentsOfFile)
            {
                const char* tolua_ret = contentsOfFile->getCString();
                tolua_pushstring(tolua_S, tolua_ret);
            }
            return 1;
        }
    }
    
    luaL_error(tolua_S, "%s has wrong number of arguments: %d, was expecting %d\n", "cc.FileUtils:getStringFromFile", argc, 1);
    return 0;
    
#if COCOS2D_DEBUG >= 1
tolua_lerror:
    tolua_error(tolua_S,"#ferror in function 'tolua_cocos2dx_FileUtils_getStringFromFile'.",&tolua_err);
    return 0;
#endif
}

修改後

static int tolua_cocos2dx_FileUtils_getStringFromFile(lua_State* tolua_S)
{
    if (nullptr == tolua_S)
        return 0;
    
    int argc = 0;
    FileUtils* self = nullptr;
    bool ok = true;
    
#if COCOS2D_DEBUG >= 1
    tolua_Error tolua_err;
    if (!tolua_isusertype(tolua_S,1,"cc.FileUtils",0,&tolua_err)) goto tolua_lerror;
#endif
    
    self = static_cast<FileUtils *>(tolua_tousertype(tolua_S,1,0));
    
#if COCOS2D_DEBUG >= 1
    if (nullptr == self)
    {
		tolua_error(tolua_S,"invalid 'self' in function 'tolua_cocos2dx_FileUtils_getStringFromFile'\n", nullptr);
		return 0;
	}
#endif
    
    argc = lua_gettop(tolua_S) - 1;
    
    if (1 == argc)
    {
        const char* arg0;
        std::string arg0_tmp; ok &= luaval_to_std_string(tolua_S, 2, &arg0_tmp, "cc.FileUtils:getStringFromFile"); arg0 = arg0_tmp.c_str();
        if (ok)
        {
            std::string fullPathName = FileUtils::getInstance()->fullPathForFilename(arg0);
            Data data = FileUtils::getInstance()->getDataFromFile(fullPathName.c_str());
            if (!data.isNull()) {
                tolua_pushlstring(tolua_S, (const char*)data.getBytes(), data.getSize());
            }
            return 1;
        }
    }
    
    luaL_error(tolua_S, "%s has wrong number of arguments: %d, was expecting %d\n", "cc.FileUtils:getStringFromFile", argc, 1);
    return 0;
    
#if COCOS2D_DEBUG >= 1
tolua_lerror:
    tolua_error(tolua_S,"#ferror in function 'tolua_cocos2dx_FileUtils_getStringFromFile'.",&tolua_err);
    return 0;
#endif
}

把

            __String* contentsOfFile = __String::createWithContentsOfFile(fullPathName.c_str());
            if (nullptr != contentsOfFile)
            {
                const char* tolua_ret = contentsOfFile->getCString();
                tolua_pushstring(tolua_S, tolua_ret);
            }

替換成

            Data data = FileUtils::getInstance()->getDataFromFile(fullPathName.c_str());
            if (!data.isNull()) {
                tolua_pushlstring(tolua_S, (const char*)data.getBytes(), data.getSize());
            }

文件

tolua_push.h添加

TOLUA_API void tolua_pushlstring (lua_State* L, const char* value, size_t length);

 tolua_push.c 添加

TOLUA_API void tolua_pushlstring (lua_State* L, const char* value, size_t length)
{
    if (value == NULL)
        lua_pushnil(L);
    else
        lua_pushlstring(L,value,length);
}