Visual Basic 6.0 Requires Chilkat v11.4.0+

Call a JavaScript Function Returning a String

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

Dim success As Long
success = 0

'  This is the JavaScript function we'll call:

'  function greet(name) {
'      return "Hello, " + name + "!";
'  }

Dim sbScript As New ChilkatStringBuilder
success = sbScript.Append("function greet(name) { return ""Hello, "" + name + ""!""; }")

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 greet("Michael")

Dim funcCall As New ChilkatJsonObject

'  Create JSON specifying the function name and arguments

'  {
'    "name": "greet",
'    "args": [ "Michael" ]
'  }

success = funcCall.UpdateString("name","greet")
success = funcCall.UpdateString("args[0]","Michael")

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": "string",
'    "value": "Hello, Michael!"
'  }

Dim retval As String
retval = result.StringOf("value")
Debug.Print retval

'  Output:
'  Hello, Michael!