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DataFlex Examples

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(DataFlex) JSON: Nested Objects

Here we have a JSON object that contains nested JSON objects. This example demonstrates how to access the contents of the nested objects.

{
  "name": "donut",
  "image":
    {
    "fname": "donut.jpg",
    "w": 200,
    "h": 200
    },
  "thumbnail":
    {
    "fname": "donutThumb.jpg",
    "w": 32,
    "h": 32
    }
}

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

Use ChilkatAx-9.5.0-win32.pkg

Procedure Test
    Handle hoJson
    String sJsonStr
    Boolean iSuccess
    Variant vImageObj
    Handle hoImageObj
    Variant vThumbObj
    Handle hoThumbObj
    String sTemp1
    Integer iTemp1
    Integer iTemp2
    Boolean bTemp1

    Get Create (RefClass(cComChilkatJsonObject)) To hoJson
    If (Not(IsComObjectCreated(hoJson))) Begin
        Send CreateComObject of hoJson
    End

    // This is the above JSON with whitespace chars removed (SPACE, TAB, CR, and LF chars).
    // The presence of whitespace chars for pretty-printing makes no difference to the Load
    // method. 
    Move '{"name": "donut","image":{"fname": "donut.jpg","w": 200,"h": 200},"thumbnail":{"fname": "donutThumb.jpg","w": 32,"h": 32}}' To sJsonStr

    Get ComLoad Of hoJson sJsonStr To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoJson To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Get the "image" object.
    Get ComObjectOf Of hoJson "image" To vImageObj
    If (IsComObject(vImageObj)) Begin
        Get Create (RefClass(cComChilkatJsonObject)) To hoImageObj
        Set pvComObject Of hoImageObj To vImageObj
    End
    Get ComLastMethodSuccess Of hoJson To bTemp1
    If (bTemp1 = False) Begin
        Showln "image object not found."
        Procedure_Return
    End

    Get ComStringOf Of hoImageObj "fname" To sTemp1
    Get ComIntOf Of hoImageObj "w" To iTemp1
    Get ComIntOf Of hoImageObj "h" To iTemp2
    Showln "image: fname=" sTemp1 ", width=" iTemp1 ", height=" iTemp2

    Send Destroy of hoImageObj

    // Get the "thumbnail" object.
    Get ComObjectOf Of hoJson "thumbnail" To vThumbObj
    If (IsComObject(vThumbObj)) Begin
        Get Create (RefClass(cComChilkatJsonObject)) To hoThumbObj
        Set pvComObject Of hoThumbObj To vThumbObj
    End
    Get ComLastMethodSuccess Of hoJson To bTemp1
    If (bTemp1 = False) Begin
        Showln "thumbnail object not found."
        Procedure_Return
    End

    Get ComStringOf Of hoThumbObj "fname" To sTemp1
    Get ComIntOf Of hoThumbObj "w" To iTemp1
    Get ComIntOf Of hoThumbObj "h" To iTemp2
    Showln "thumbnail: fname=" sTemp1 ", width=" iTemp1 ", height=" iTemp2

    Send Destroy of hoThumbObj


End_Procedure

 

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