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Creating Binary Data

This example shows how to create binary data by creating binary images.

The complete code of this example is available in the the Spotfire SDK 2.2:

• Spotfire SDK\Examples\Extensions\SpotfireDeveloper.ApiExamples\BinaryDataExample.cs

private class MyBinaryDataRowReader : CustomDataRowReader
{
    // ...

    /// <summary>
    /// Setting the cursor values. 
    /// Each row has the row number (starting on 1) in the Number column, 
    /// and the same number as png image in the Binary column.
    /// </summary>
    /// <returns>true for the first 99 rows, false otherwise.</returns>
    protected override bool MoveNextCore()
    {
        // Limit to 99 rows.
        bool result = (++rowCount < 100);

        // Only set values if less than 99 rows.
        if (result)
        {
            // Create a memory stream to use when converting the image to png.
            using (MemoryStream ms = new MemoryStream())
            {
                // Set the integer value
                intCursor.MutableDataValue.Value = rowCount;
                intCursor.MutableDataValue.IsValid = true;

                // Create an image with the rowcount number.
                Image image = new Bitmap(50, 50);
                Graphics graph = Graphics.FromImage(image);
                graph.DrawString(rowCount.ToString(), 
					new Font("Arial", 16), 
					new SolidBrush(Color.Black), 
					new PointF(20.0F, 20.0F));

                // Convert image to png.
                image.Save(ms, ImageFormat.Png);

                // Reset memory stream to get ready to read binary values.
                ms.Position = 0;

                // Create the BinaryLargeObject from the memory stream and set the binary value.
                binaryCursor.MutableDataValue.Value = BinaryLargeObject.Create(ms);
                binaryCursor.MutableDataValue.IsValid = true;
            }
        }

        // Return
        return result;
        
    }
    // ...
}