In diesem Beitrag hatte ich den neuen Node, der aus Text leicht einen QR-Code erzeugt beschrieben. Wie können aber nun QR-Codes direkt in einem NodeRed-Flow und nicht nur im Dashboard angezeigt werden?
Hier ein produktiver Prototyp dazu, man sieht unten rechts den Barcode im Flow. Cool. Geht auch mit Impfnachweisen 😉 …
Damit der Flow auf die QR-Code Dateien zugreifen kann, muss in der settings.js
das Verzeichnis für Static geöffnet werden: httpStatic: ‚/data/‘ und dann ein restart.
Dann kann man testen, ob der Zugriff auf das Verzeichnis über URL läuft z.B. http://pi:1880/wenzlaff-address-qr-code.png
Das Bild muss dann im Browser angezeigt werden.
Hier der ganze Flow als Beispielcode
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[ { "id": "15f97750.9f15d1", "type": "inject", "z": "fa6c893a.ae8d8", "name": "Meine echte Bitcoin Adresse", "props": [ { "p": "payload" } ], "repeat": "", "crontab": "", "once": false, "onceDelay": 0.1, "topic": "", "payload": "bitcoin:1NSaQXyTHGanGvQHgPkoSDtbBY2LFySnyc", "payloadType": "str", "x": 240, "y": 160, "wires": [ [ "432536df.024b4" ] ] }, { "id": "ed289c05.b34a7", "type": "comment", "z": "fa6c893a.ae8d8", "name": "(c) 2021 Thomas Wenzlaff www.wenzlaff.info", "info": "", "x": 810, "y": 60, "wires": [] }, { "id": "987d0461.3a3738", "type": "comment", "z": "fa6c893a.ae8d8", "name": "Create simple QR-Code from Bitcoin Address or other text", "info": "", "x": 310, "y": 60, "wires": [] }, { "id": "c36f4049.b9248", "type": "cryptoqrcode", "z": "fa6c893a.ae8d8", "name": "", "filename": "/data/wenzlaff-address-qr-code.png", "prefix": "", "x": 570, "y": 160, "wires": [ [] ] }, { "id": "ca1faa5b.5d7e38", "type": "image viewer", "z": "fa6c893a.ae8d8", "name": "Anzeigen", "width": "160", "data": "payload", "dataType": "msg", "x": 900, "y": 280, "wires": [ [] ] }, { "id": "38e5e7e1.a5be58", "type": "jimp-image", "z": "fa6c893a.ae8d8", "name": "QR-Code", "data": "payload", "dataType": "msg", "ret": "img", "parameter1": "", "parameter1Type": "msg", "parameter2": "", "parameter2Type": "msg", "parameter3": "", "parameter3Type": "msg", "parameter4": "", "parameter4Type": "msg", "parameter5": "", "parameter5Type": "msg", "parameter6": "", "parameter6Type": "msg", "parameter7": "", "parameter7Type": "msg", "parameter8": "", "parameter8Type": "msg", "sendProperty": "payload", "sendPropertyType": "msg", "parameterCount": 0, "jimpFunction": "none", "selectedJimpFunction": { "name": "none", "fn": "none", "description": "Just loads the image.", "parameters": [] }, "x": 740, "y": 280, "wires": [ [ "ca1faa5b.5d7e38" ] ] }, { "id": "672bd969.3ff0d8", "type": "function", "z": "fa6c893a.ae8d8", "name": "Set Payload", "func": "msg.payload = \"http://PI-ADRESSE-Eintragen:1880/wenzlaff-address-qr-code.png\"\nreturn msg;", "outputs": 1, "noerr": 0, "initialize": "", "finalize": "", "x": 550, "y": 280, "wires": [ [ "38e5e7e1.a5be58" ] ] }, { "id": "1d73b5de.0c1082", "type": "comment", "z": "fa6c893a.ae8d8", "name": "In den paylod kommt der Inhalt des QR-Codes", "info": "", "x": 280, "y": 120, "wires": [] }, { "id": "9c186f66.5f672", "type": "ui_template", "z": "fa6c893a.ae8d8", "group": "133f148a.00b863", "name": "QR-Code", "order": 0, "width": "9", "height": "9", "format": "\n<img width=\"300\" height=\"300\" src=\"{{msg.qrcode}}\" alt=\"QR-Code nicht gefunden.\" />\n", "storeOutMessages": true, "fwdInMessages": true, "resendOnRefresh": true, "templateScope": "local", "x": 740, "y": 220, "wires": [ [ "659b5615.61388" ] ] }, { "id": "659b5615.61388", "type": "debug", "z": "fa6c893a.ae8d8", "name": "Info", "active": true, "tosidebar": true, "console": false, "tostatus": true, "complete": "payload", "targetType": "msg", "statusVal": "payload", "statusType": "auto", "x": 890, "y": 220, "wires": [] }, { "id": "e0d18c4.8e93d7", "type": "comment", "z": "fa6c893a.ae8d8", "name": "Anpassung in der settings.js nötig", "info": "In der settings.js\n\ndas Verzeichnis für Static öffnen\n\nhttpStatic: '/data/',\n\nsetzen. \n\nRestart. \n\nZugriff dann über \n\nhttp://pi:1880/wenzlaff-address-qr-code.png", "x": 240, "y": 520, "wires": [] }, { "id": "9bf09b2a.189ce8", "type": "function", "z": "fa6c893a.ae8d8", "name": "Set Payload", "func": "// damit der Browser das Bild neu lädt, \n// und nicht aus dem cash holt mit Date getTime das neuladen erzwingen\nmsg.qrcode = \"http://pi-vier:1880/wenzlaff-address-qr-code.png?\" + new Date().getTime();\nreturn msg;", "outputs": 1, "noerr": 0, "initialize": "", "finalize": "", "x": 550, "y": 220, "wires": [ [ "9c186f66.5f672" ] ] }, { "id": "432536df.024b4", "type": "ui_text_input", "z": "fa6c893a.ae8d8", "name": "", "label": "Inhalt", "tooltip": "Der Text der hier eingebeben wird, wird automatisch zum QR-Code", "group": "133f148a.00b863", "order": 1, "width": "9", "height": "1", "passthru": true, "mode": "text", "delay": 300, "topic": "topic", "topicType": "msg", "x": 310, "y": 240, "wires": [ [ "672bd969.3ff0d8", "9bf09b2a.189ce8", "c36f4049.b9248" ] ] }, { "id": "30ce2267.ec683e", "type": "comment", "z": "fa6c893a.ae8d8", "name": "Buy my a coffee: bitcoin:1NSaQXyTHGanGvQHgPkoSDtbBY2LFySnyc", "info": "", "x": 750, "y": 520, "wires": [] }, { "id": "133f148a.00b863", "type": "ui_group", "name": "QR-Code", "tab": "d59e6cd1.036bd", "order": 1, "disp": true, "width": "9", "collapse": false }, { "id": "d59e6cd1.036bd", "type": "ui_tab", "name": "QR-Code", "icon": "dashboard", "disabled": false, "hidden": false } ] |