code_device/hgdriver/hgdev/jsonconfig.cpp

#include "jsonconfig.h"
#include <streambuf>


jsonconfig::jsonconfig()
{

}
jsonconfig::jsonconfig(int devnum):DEVICEJSONPATH("")
{
    switch (devnum)
    {
        case 100:
        DEVICEJSONPATH=G100JSONPATH;
        break;
        case 200:
        DEVICEJSONPATH=G200JSONPATH;
        break;
        case 300:
        DEVICEJSONPATH=G300JSONPATH;
        break;
        case 400:
        DEVICEJSONPATH=G400JSONPATH;
        break;
    default:
        break;
    }
}

json jsonconfig::loadjson(std::string path)
{
    json js="";
    if(path.empty())
        return js;
    std::ifstream f;
    f.open(path,std::ios::in | std::ios::binary);
    if(f.is_open()){
        //std::string text = (std::stringstream() << f.rdbuf()).str();
        std::string text ((std::istreambuf_iterator<char>(f)),
                          std::istreambuf_iterator<char>());
        js = json::parse(text);
        f.close();
    }
    return js;
}

json jsonconfig::loadjson()
{   
    json js="";
    std::string path=DEVICEJSONPATH;    
    if(path.empty())
        return js;
    std::ifstream f;
    f.open(path,std::ios::in | std::ios::binary);
    if(f.is_open()){
        std::string text ((std::istreambuf_iterator<char>(f)),
                          std::istreambuf_iterator<char>());
        js = json::parse(text);
        f.close();
    }
    return js;
}
json jsonconfig::load_json_from_text(const char* json_txt)
{
    return json::parse(json_txt);
}

std::string jsonconfig::getdeviceparam(unsigned param_no)
{
   json js=loadjson();
   if (js.empty())
    return NULL;
   js[std::to_string(param_no)]["cur"]=0;
    std::string str=js[std::to_string(param_no)].dump();
    if (str.empty())
    return NULL;

    return str;
}

bool jsonconfig::savejson(std::string path,json js)
{
    if(path.empty())
        return false;
    std::ofstream of;
    of.open(path);
    if(of.is_open())
    {
        of.write(js.dump().data(),js.dump().size());
        of.close();
        return true;
    }
    return false;
}

json jsonconfig::defaultjson()
{
    std::string jsstr=R"({
	"info":[{
		"type":"GScanO200",
		"name":"HUAGO G100 Scanner",
                "vid":"3072",
                "pid":"100"
	},
	{
		"type":"GScanO200",
		"name":"HUAGO G200 Scanner",
                "vid":"3072",
                "pid":"200"
	},
	{
		"type":"GScanO400",
		"name":"HUAGO G300 Scanner",
                "vid":"3072",
                "pid":"300"
	},
	{
		"type":"GScanO400",
		"name":"HUAGO G400 Scanner",
                "vid":"3072",
                "pid":"400"
	},
	{
		"type":"GScanO1003399",
		"name":"HUAGO G139 Scanner",
                "vid":"3072",
                "pid":"139"
	},
	{
		"type":"GScanO1003399",
		"name":"HUAGO G239 Scanner",
                "vid":"3072",
                "pid":"239"
	}]
})";
    return json::parse(jsstr);
}