wait for QR code set runtime var
Waits until a QR code is visible on the named camera and stores the decoded text.
Complete block reference (3 blocks)
TurboWarp QR input
Read QR text from a named camera.
TurboWarp jsQR consumes frames from Camera Source, decodes QR code text, and can target a dedicated downward-facing camera such as `qr` while TurboWarp TM uses another camera.
wait for QR code on camera qrlast QR text
Blocks
wait for QR code and broadcast
Stores the decoded text and starts a broadcast hat after the write.
last QR text
Reports the most recent decoded QR text.
API capability
Unsandboxed extensions can read `Scratch.vm.runtime.ext_kubohiroyajsqr`.
const text = await jsqr.waitForQrText({cameraId: 'qr', signal});
const read = await jsqr.readFrame(frameSource); // { text, bytes, structuredAppend } or null
const textOrNull = await jsqr.scanFrame(frameSource);`waitForQrText()` acquires the named Camera Source lease, polls frames, releases its lease, and returns the first decoded text.
Setup
Load Camera Source before jsQR. Runtime-variable blocks require the Temporary Variables extension (`lmsTempVars2`). The extension does not upload camera frames.