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DataFlex Examples

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(DataFlex) Create more Complex JSON Document

Sample code to create the following JSON document:

    {  
        "Title": "The Cuckoo's Calling",  
        "Author": "Robert Galbraith",  
        "Genre": "classic crime novel",  
        "Detail": {  
            "Publisher": "Little Brown",  
            "Publication_Year": 2013,  
            "ISBN-13": 9781408704004,  
            "Language": "English",  
            "Pages": 494  
        },  
        "Price": [  
            {  
                "type": "Hardcover",  
                "price": 16.65  
            },  
            {  
                "type": "Kindle Edition",  
                "price": 7.00  
            }  
        ]  
    }  

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

Use ChilkatAx-9.5.0-win32.pkg

Procedure Test
    Handle hoJson
    Boolean iSuccess
    Integer iIndex
    Variant vDetail
    Handle hoDetail
    Variant vAPrice
    Handle hoAPrice
    Variant vPriceObj
    Handle hoPriceObj
    String sTemp1
    Integer iTemp1

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

    // The only reason for failure in the following lines of code would be an out-of-memory condition..

    // An index value of -1 is used to append at the end.
    Move -1 To iIndex

    Get ComAddStringAt Of hoJson -1 "Title" "The Cuckoo's Calling" To iSuccess
    Get ComAddStringAt Of hoJson -1 "Author" "Robert Galbraith" To iSuccess
    Get ComAddStringAt Of hoJson -1 "Genre" "classic crime novel" To iSuccess

    // Let's create the Detail JSON object:
    Get ComAddObjectAt Of hoJson -1 "Detail" To iSuccess
    Get ComSize Of hoJson To iTemp1
    Get ComObjectAt Of hoJson (iTemp1 - 1) To vDetail
    If (IsComObject(vDetail)) Begin
        Get Create (RefClass(cComChilkatJsonObject)) To hoDetail
        Set pvComObject Of hoDetail To vDetail
    End
    Get ComAddStringAt Of hoDetail -1 "Publisher" "Little Brown" To iSuccess
    Get ComAddIntAt Of hoDetail -1 "Publication_Year" 2013 To iSuccess
    Get ComAddNumberAt Of hoDetail -1 "ISBN-13" "9781408704004" To iSuccess
    Get ComAddStringAt Of hoDetail -1 "Language" "English" To iSuccess
    Get ComAddIntAt Of hoDetail -1 "Pages" 494 To iSuccess
    Send Destroy of hoDetail

    // Add the array for Price
    Get ComAddArrayAt Of hoJson -1 "Price" To iSuccess
    Get ComSize Of hoJson To iTemp1
    Get ComArrayAt Of hoJson (iTemp1 - 1) To vAPrice
    If (IsComObject(vAPrice)) Begin
        Get Create (RefClass(cComChilkatJsonArray)) To hoAPrice
        Set pvComObject Of hoAPrice To vAPrice
    End

    // Entry entry in aPrice will be a JSON object.

    // Append a new/empty ojbect to the end of the aPrice array.
    Get ComAddObjectAt Of hoAPrice -1 To iSuccess
    // Get the object that was just appended.
    Get ComSize Of hoAPrice To iTemp1
    Get ComObjectAt Of hoAPrice (iTemp1 - 1) To vPriceObj
    If (IsComObject(vPriceObj)) Begin
        Get Create (RefClass(cComChilkatJsonObject)) To hoPriceObj
        Set pvComObject Of hoPriceObj To vPriceObj
    End
    Get ComAddStringAt Of hoPriceObj -1 "type" "Hardcover" To iSuccess
    Get ComAddNumberAt Of hoPriceObj -1 "price" "16.65" To iSuccess
    Send Destroy of hoPriceObj

    Get ComAddObjectAt Of hoAPrice -1 To iSuccess
    Get ComSize Of hoAPrice To iTemp1
    Get ComObjectAt Of hoAPrice (iTemp1 - 1) To vPriceObj
    If (IsComObject(vPriceObj)) Begin
        Get Create (RefClass(cComChilkatJsonObject)) To hoPriceObj
        Set pvComObject Of hoPriceObj To vPriceObj
    End
    Get ComAddStringAt Of hoPriceObj -1 "type" "Kindle Edition" To iSuccess
    Get ComAddNumberAt Of hoPriceObj -1 "price" "7.00" To iSuccess
    Send Destroy of hoPriceObj

    Send Destroy of hoAPrice

    Set ComEmitCompact Of hoJson To False
    Get ComEmit Of hoJson To sTemp1
    Showln sTemp1


End_Procedure

 

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