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DataFlex Examples

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(DataFlex) Get the Root of a JSON Document

Demonstrates how to get back to the JSON root object from anywhere in the JSON document. This example uses the following JSON document:

{
  "flower": "tulip",
  "abc":
    {
    "x": [
       { "a" : 1 },
       { "b1" : 100, "b2" : 200 },
       { "c" : 3 }
    ],
    "y": 200,
    "z": 200
    }
}

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 vAbcObj
    Handle hoAbcObj
    Variant vXArray
    Handle hoXArray
    Variant vBObj
    Handle hoBObj
    Variant vDocRoot
    Handle hoDocRoot
    String sTemp1
    Integer iTemp1
    Boolean bTemp1

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

    Move '{"flower": "tulip","abc":{"x": [{ "a" : 1 },{ "b1" : 100, "b2" : 200 },{ "c" : 3 }],"y": 200,"z": 200}}' 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 "abc" object.
    Get ComObjectOf Of hoJson "abc" To vAbcObj
    If (IsComObject(vAbcObj)) Begin
        Get Create (RefClass(cComChilkatJsonObject)) To hoAbcObj
        Set pvComObject Of hoAbcObj To vAbcObj
    End
    Get ComLastMethodSuccess Of hoJson To bTemp1
    If (bTemp1 = False) Begin
        Showln "abc object not found."
        Procedure_Return
    End

    // Side note: The JSON of a sub-part of the document can be emitted from any JSON object:
    Set ComEmitCompact Of hoAbcObj To False
    Get ComEmit Of hoAbcObj To sTemp1
    Showln sTemp1

    // Navigate to the "x" array
    Get ComArrayOf Of hoAbcObj "x" To vXArray
    If (IsComObject(vXArray)) Begin
        Get Create (RefClass(cComChilkatJsonArray)) To hoXArray
        Set pvComObject Of hoXArray To vXArray
    End
    // We'll skip the null check and assume it's non-null...

    // Navigate to the 2nd object contained within the array.  This contains members b1 and b2
    Get ComObjectAt Of hoXArray 1 To vBObj
    If (IsComObject(vBObj)) Begin
        Get Create (RefClass(cComChilkatJsonObject)) To hoBObj
        Set pvComObject Of hoBObj To vBObj
    End
    // We'll skip the null check and assume it's non-null...

    // Show that we're at "b1/b2".
    // The value of "b1" should be "200"
    Get ComIntOf Of hoBObj "b2" To iTemp1
    Showln "b2 = " iTemp1

    // Now go back to the JSON doc root:
    Get ComGetDocRoot Of hoBObj To vDocRoot
    If (IsComObject(vDocRoot)) Begin
        Get Create (RefClass(cComChilkatJsonObject)) To hoDocRoot
        Set pvComObject Of hoDocRoot To vDocRoot
    End
    // We'll skip the null check and assume it's non-null...

    // Pretty-print the JSON doc from the root to show that this is indeed the root.
    Set ComEmitCompact Of hoDocRoot To False
    Get ComEmit Of hoDocRoot To sTemp1
    Showln sTemp1

    Send Destroy of hoDocRoot
    Send Destroy of hoBObj
    Send Destroy of hoXArray
    Send Destroy of hoAbcObj


End_Procedure

 

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