Visual Basic 6.0

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