Visual Basic 6.0 Requires Chilkat v11.4.0+

Call a JavaScript Function Returning an Object

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Demonstrates how to call a JavaScript function that returns an object. Visual Basic 6.0

Dim success As Long
success = 0

'  This is the JavaScript function we'll call:

'  function getSettings() {
'      return {
'          theme: "dark",
'          notifications: true,
'          version: 1.0
'      };
'  }

Dim sbScript As New ChilkatStringBuilder
success = sbScript.Append("function getSettings() {")
success = sbScript.Append("    return {")
success = sbScript.Append("        theme: ""dark"",")
success = sbScript.Append("        notifications: true,")
success = sbScript.Append("        version: 1.0")
success = sbScript.Append("    };")
success = sbScript.Append("}")

Dim js As New ChilkatJs

Dim result As New ChilkatJsonObject
result.EmitCompact = 0

'  Call Eval to add the function to the context's global object
success = js.Eval(sbScript,result)
If (success = 0) Then
    '  Examine the result for an exception.
    Debug.Print result.Emit()

    '  Also examine the LastErrorText.
    Debug.Print js.LastErrorText
    Exit Sub
End If

'  ------------------------------------------------------------------------------
'  Call the function getSettings()

Dim funcCall As New ChilkatJsonObject

'  Create JSON specifying the function name and arguments
'  The function has no arguments, so we only specify the name.

'  {
'    "name": "getSettings",
'  }

success = funcCall.UpdateString("name","getSettings")

success = js.CallFunction(funcCall,result)
If (success = 0) Then
    '  Examine the result for an exception.
    Debug.Print result.Emit()

    '  Also examine the LastErrorText.
    Debug.Print js.LastErrorText
    Exit Sub
End If

Debug.Print result.Emit()

'  Output:
'  {
'    "type": "object",
'    "value": {
'      "theme": "dark",
'      "notifications": true,
'      "version": 1
'    }
'  }

'  Examine the object's members
Debug.Print "theme: " & result.StringOf("value.theme")
Debug.Print "notifications: " & result.BoolOf("value.notifications")
Debug.Print "version: " & result.IntOf("value.version")

'  Output:
'  theme: dark
'  notifications: True
'  version: 1