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DataFlex Examples

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(DataFlex) JSON: Array of Objects

Here we have a JSON object that contains an array, where each element in the array is a JSON object. This example demonstrates how to access the objects contained within an array.

{ 
  "employees":[
    {"firstName":"John", "lastName":"Doe"},
    {"firstName":"Anna", "lastName":"Smith"},
    {"firstName":"Peter","lastName":"Jones"}
  ]
}

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 vEmployees
    Handle hoEmployees
    Integer iNumEmployees
    Integer i
    Variant vEmpObj
    Handle hoEmpObj
    String sTemp1
    String sTemp2

    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 '{"employees":[{"firstName":"John", "lastName":"Doe"},{"firstName":"Anna", "lastName":"Smith"},{"firstName":"Peter","lastName":"Jones"}]}' 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 "employees" array.
    Get ComArrayOf Of hoJson "employees" To vEmployees
    If (IsComObject(vEmployees)) Begin
        Get Create (RefClass(cComChilkatJsonArray)) To hoEmployees
        Set pvComObject Of hoEmployees To vEmployees
    End
    If (IsNullComObject(vEmployees)) Begin
        Showln "employees member not found."
        Procedure_Return
    End

    //  Iterate over each employee, getting the JSON object at each index.
    Get ComSize Of hoEmployees To iNumEmployees

    For i From 0 To (iNumEmployees - 1)

        Get ComObjectAt Of hoEmployees i To vEmpObj
        If (IsComObject(vEmpObj)) Begin
            Get Create (RefClass(cComChilkatJsonObject)) To hoEmpObj
            Set pvComObject Of hoEmpObj To vEmpObj
        End

        Get ComStringOf Of hoEmpObj "firstName" To sTemp1
        Get ComStringOf Of hoEmpObj "lastName" To sTemp2
        Showln "employee[" i "] = " sTemp1 " " sTemp2
        Send Destroy of hoEmpObj
    Loop

    Send Destroy of hoEmployees


End_Procedure

 

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