SQL Server Requires Chilkat v11.7.0+

QR Code Colors and Transparent Background

See more QR Code Examples

Demonstrates colored QR codes. render.foreground is the color of the dark modules and render.background the color behind them, each as #RRGGBB. Either can instead be an object with a color and an opacity from 0 to 1, and a background opacity of 0 gives a PNG with a transparent background to place over a page or a design. Readers need contrast: keep the modules clearly darker than whatever ends up behind them. SQL Server

--
CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    DECLARE @iTmp0 int
    DECLARE @sTmp0 nvarchar(4000)
    DECLARE @success int
    SELECT @success = 0

    --  This example requires the Chilkat API to have been previously unlocked.
    --  See Global Unlock Sample for sample code.

    DECLARE @fmt int
    EXEC @hr = sp_OACreate 'Chilkat.Formats', @fmt OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    DECLARE @jsonOut int
    EXEC @hr = sp_OACreate 'Chilkat.JsonObject', @jsonOut OUT

    --  Dark blue modules on a pale yellow background.
    DECLARE @json int
    EXEC @hr = sp_OACreate 'Chilkat.JsonObject', @json OUT

    EXEC sp_OAMethod @json, 'UpdateString', @success OUT, 'payload.text', 'https://www.chilkatsoft.com/'
    EXEC sp_OAMethod @json, 'UpdateInt', @success OUT, 'render.moduleSize', 6
    EXEC sp_OAMethod @json, 'UpdateString', @success OUT, 'render.foreground', '#1B3A6B'
    EXEC sp_OAMethod @json, 'UpdateString', @success OUT, 'render.background', '#FFF8DC'
    EXEC sp_OAMethod @json, 'UpdateString', @success OUT, 'output.path', 'qa_output/qr_blue.png'
    EXEC sp_OAMethod @json, 'UpdateBool', @success OUT, 'output.overwrite', 1
    EXEC sp_OAMethod @json, 'UpdateString', @success OUT, 'output.return', 'none'
    EXEC sp_OAMethod @fmt, 'QrCode', @success OUT, 'generate', @json, @jsonOut
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @fmt, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @fmt
        EXEC @hr = sp_OADestroy @jsonOut
        EXEC @hr = sp_OADestroy @json
        RETURN
      END

    EXEC sp_OAMethod @jsonOut, 'StringOf', @sTmp0 OUT, 'outputs[0].path'

    EXEC sp_OAMethod @jsonOut, 'IntOf', @iTmp0 OUT, 'outputs[0].byteCount'

    PRINT 'colored: ' + @sTmp0 + ', ' + @iTmp0 + ' bytes'

    --  The image written to qa_output/qr_blue.png:

    --  

    --  The same modules on a fully transparent background.
    DECLARE @json2 int
    EXEC @hr = sp_OACreate 'Chilkat.JsonObject', @json2 OUT

    EXEC sp_OAMethod @json2, 'UpdateString', @success OUT, 'payload.text', 'https://www.chilkatsoft.com/'
    EXEC sp_OAMethod @json2, 'UpdateInt', @success OUT, 'render.moduleSize', 6
    EXEC sp_OAMethod @json2, 'UpdateString', @success OUT, 'render.foreground', '#1B3A6B'
    EXEC sp_OAMethod @json2, 'UpdateString', @success OUT, 'render.background.color', '#FFFFFF'
    EXEC sp_OAMethod @json2, 'UpdateNumber', @success OUT, 'render.background.opacity', '0'
    EXEC sp_OAMethod @json2, 'UpdateString', @success OUT, 'output.path', 'qa_output/qr_transparent.png'
    EXEC sp_OAMethod @json2, 'UpdateBool', @success OUT, 'output.overwrite', 1
    EXEC sp_OAMethod @json2, 'UpdateString', @success OUT, 'output.return', 'none'
    EXEC sp_OAMethod @fmt, 'QrCode', @success OUT, 'generate', @json2, @jsonOut
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @fmt, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @fmt
        EXEC @hr = sp_OADestroy @jsonOut
        EXEC @hr = sp_OADestroy @json
        EXEC @hr = sp_OADestroy @json2
        RETURN
      END

    EXEC sp_OAMethod @jsonOut, 'StringOf', @sTmp0 OUT, 'outputs[0].path'

    EXEC sp_OAMethod @jsonOut, 'IntOf', @iTmp0 OUT, 'outputs[0].byteCount'

    PRINT 'transparent: ' + @sTmp0 + ', ' + @iTmp0 + ' bytes'

    --  qa_output/qr_transparent.png, placed here over a checkerboard and over a colored page
    --  to show that whatever is behind the image shows through:

    --  

    --  Sample output:

    --  colored: qa_output/qr_blue.png, 1345 bytes
    --  transparent: qa_output/qr_transparent.png, 1377 bytes

    EXEC @hr = sp_OADestroy @fmt
    EXEC @hr = sp_OADestroy @jsonOut
    EXEC @hr = sp_OADestroy @json
    EXEC @hr = sp_OADestroy @json2


END
GO