Question

Hello i was trying to create a chart using chartdirector and vb.net
what i exactly trying to do is create a sub that returns an image as object class and then append what ever return from the sub to image tag in my page

Here is what i have done so far :

   Private Sub createChart(ByVal sender As System.Object, ByVal e As 
    _System.EventArgs)
    Dim cd As Integer = CreateObject("ChartDirector.API")
    Dim chart As XYChart = New XYChart(700, 170)
    Dim values As Double() = {25, 18, 15, 12, 8, 30, 35}
    Dim labels As String() = {"Labor", "Licenses", "Taxes", "Legal", 
    "Insurance", "Facilities", "Production"}
    chart.setPlotArea(30, 20, 200, 200)
    chart.addBarLayer(values)
    chart.xAxis().setLabels(labels)
    HttpContext.Current.Response.ContentType = "image/png"
    Dim mina As BinaryWriter = chart.makeChart2()
    HttpContext.Current.Response.End()

End Sub

the code break at this line

 Dim mina As BinaryWriter = chart.makeChart2()

with the following error Argument not specified for parameter format of public overridable function makechart2(format as integer ) As Byte()

any idea how to fix this will be great
Thanks

Answer 1

According to the error, makeChart2 requires an integer parameter, and it also looks like it returns an array of Byte, not a BinaryWriter.

I’m not familiar with chartdirector, so I don’t know if there is an alternative, or if you’ll have to refactor your code, but if it is the latter, you’ll need to new up a BinaryWriter, and Write the return value from makeChart2 to it.