(MFC) Find and Delete Object from JSON Array

Demonstrates how to find an delete an object from a JSON array of objects.

Chilkat C/C++ Library Downloads MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

#include <CkJsonObject.h>
#include <CkJsonArray.h>

void ChilkatSample(void)
    {
    CkString strOut;

    // This example will delete the "Pasta" category object from Menu B.

    // {
    //   "menus": [
    //     {
    //       "name": "Menu A",
    //       "categories": [
    // 			{
    // 			"name": "Kebabs",
    // 			"description": "blah blah blah"
    // 			},
    // 			{
    // 			"name": "Burgers",
    // 			"description": "blah blah blah"
    // 			},
    // 			{
    // 			"name": "Pasta",
    // 			"description": "blah blah blah"
    // 			},
    // 			{
    // 			"name": "Appetizers",
    // 			"description": "blah blah blah"
    // 			}
    // 		]
    // 	},
    //     {
    //       "name": "Menu B",
    //       "categories": [
    // 			{
    // 			"name": "Kebabs",
    // 			"description": "blah blah blah"
    // 			},
    // 			{
    // 			"name": "Burgers",
    // 			"description": "blah blah blah"
    // 			},
    // 			{
    // 			"name": "Pasta",
    // 			"description": "blah blah blah"
    // 			},
    // 			{
    // 			"name": "Appetizers",
    // 			"description": "blah blah blah"
    // 			}
    // 		]
    // 	  }
    // 	]
    // }

    CkJsonObject json;
    bool success = json.LoadFile("qa_data/json/menus.json");
    if (success == false) {
        strOut.append(json.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Find Menu B.
    CkJsonObject *menu = json.FindRecord("menus","name","Menu B",true);
    // assume menu is found..

    // Get the categories array, and then find the index of the "Pasta" menu category.
    CkJsonArray *catArr = menu->ArrayOf("categories");
    // Assume it is found..

    // Find the object where the name of the JSON member is "name", and the value is "Pasta"
    int index = catArr->FindObject("name","Pasta",true);
    if (index < 0) {
        strOut.append("Pasta not found.");
        strOut.append("\r\n");
    }
    else {

        // Delete the "Pasta" category record from Menu B
        success = catArr->DeleteAt(index);
        // Assume OK..
    }

    // Examine the JSON to see if it worked as expected..
    json.put_EmitCompact(false);
    strOut.append(json.emit());
    strOut.append("\r\n");

    delete catArr;
    delete menu;


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }