PowerBuilder 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. PowerBuilder

integer li_rc
long li_Success
oleobject loo_Fmt
oleobject loo_JsonOut
oleobject loo_Json
oleobject loo_Json2

li_Success = 0

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

loo_Fmt = create oleobject
li_rc = loo_Fmt.ConnectToNewObject("Chilkat.Formats")
if li_rc < 0 then
    destroy loo_Fmt
    MessageBox("Error","Connecting to COM object failed")
    return
end if
loo_JsonOut = create oleobject
li_rc = loo_JsonOut.ConnectToNewObject("Chilkat.JsonObject")

//  Dark blue modules on a pale yellow background.
loo_Json = create oleobject
li_rc = loo_Json.ConnectToNewObject("Chilkat.JsonObject")

loo_Json.UpdateString("payload.text","https://www.chilkatsoft.com/")
loo_Json.UpdateInt("render.moduleSize",6)
loo_Json.UpdateString("render.foreground","#1B3A6B")
loo_Json.UpdateString("render.background","#FFF8DC")
loo_Json.UpdateString("output.path","qa_output/qr_blue.png")
loo_Json.UpdateBool("output.overwrite",1)
loo_Json.UpdateString("output.return","none")
li_Success = loo_Fmt.QrCode("generate",loo_Json,loo_JsonOut)
if li_Success = 0 then
    Write-Debug loo_Fmt.LastErrorText
    destroy loo_Fmt
    destroy loo_JsonOut
    destroy loo_Json
    return
end if

Write-Debug "colored: " + loo_JsonOut.StringOf("outputs[0].path") + ", " + string(loo_JsonOut.IntOf("outputs[0].byteCount")) + " bytes"

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

//  

//  The same modules on a fully transparent background.
loo_Json2 = create oleobject
li_rc = loo_Json2.ConnectToNewObject("Chilkat.JsonObject")

loo_Json2.UpdateString("payload.text","https://www.chilkatsoft.com/")
loo_Json2.UpdateInt("render.moduleSize",6)
loo_Json2.UpdateString("render.foreground","#1B3A6B")
loo_Json2.UpdateString("render.background.color","#FFFFFF")
loo_Json2.UpdateNumber("render.background.opacity","0")
loo_Json2.UpdateString("output.path","qa_output/qr_transparent.png")
loo_Json2.UpdateBool("output.overwrite",1)
loo_Json2.UpdateString("output.return","none")
li_Success = loo_Fmt.QrCode("generate",loo_Json2,loo_JsonOut)
if li_Success = 0 then
    Write-Debug loo_Fmt.LastErrorText
    destroy loo_Fmt
    destroy loo_JsonOut
    destroy loo_Json
    destroy loo_Json2
    return
end if

Write-Debug "transparent: " + loo_JsonOut.StringOf("outputs[0].path") + ", " + string(loo_JsonOut.IntOf("outputs[0].byteCount")) + " 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


destroy loo_Fmt
destroy loo_JsonOut
destroy loo_Json
destroy loo_Json2