How to create a vector of maps of a JSON file.

[semrade tarik]

Hi all,
I want to access specific elements in a vector of maps. I tried to loop using a for_each like this;

usind namespace std;
            for (auto ptr : vector< map < string, string> >(pt,"NTESTCASES"))
                    BOOST_FOREACH(boost::property_tree::ptree::value_type &v, pt.get_child("TESTCASES.")) {
                cout << v.second.data() << endl;
        }

but i got nothing in the console output. This my JSON file format
{
"NTESTCASES": 6,
"TESTCASES":
{
"i1_WR_INPUT": {
"TYPE": "MUX",
"ACTION": "MuxWrInput",
"MCU": "STB-ECU",
"DATA": "EXT_VBAT_SUPPLY_1K5_1M",
"DATA1": "TcClutch_C3.23",
"DATA2": "Enable",
"ENABLED": "ON",
"PINOUT": ""
}
},
{
"i2_HST_DLY": {
"TYPE": "SYSTEM",
"ACTION": "SysHstDly",
"MCU": "BCM-ECU",
"DATA": "10",
"ENABLED": "ON",
"PINOUT": ""
}
},
{
"i3_RD_PIN": {
"TYPE": "GPI",
"ACTION": "GpiRdPin",
"MCU": "BCM-ECU",
"NAME": "DiTcClutch",
"EXPECTEDDATA": "1",
"ENABLED": "ON",
"PINOUT": ""
}
},
{
"i4_WR_INPUT": {
"TYPE": "MUX",
"ACTION": "MuxWrInput",
"MCU": "STB-ECU",
"DATA": "GND1",
"DATA1": "TcClutch_C3.23",
"DATA2": "Enable",
"ENABLED": "ON",
"PINOUT": ""
}
},
{
"i5_HST_DLY": {
"TYPE": "SYSTEM",
"ACTION": "SysHstDly",
"MCU": "BCM-ECU",
"DATA": "10",
"ENABLED": "ON",
"PINOUT": ""
}
},
{
"i6_RD_PIN": {
"TYPE": "GPI",
"ACTION": "GpiRdPin",
"MCU": "BCM-ECU",
"NAME": "DiTcClutch",
"EXPECTEDDATA": "0",
"ENABLED": "ON",
"PINOUT": ""
}
}

}
thanks for help.