「App:Library:LVGL:docs:3rd party libraries:QR code」の版間の差分
提供: robot-jp wiki
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== Example == | == Example == | ||
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=== Create a QR Code === | === Create a QR Code === | ||
− | [[ | + | [[file:LVGL docs 3rdPartyLibs QRcode 01.png|link=https://docs.lvgl.io/8.2/libs/qrcode.html#create-a-qr-code]] |
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− | https://docs.lvgl.io/8.2/libs/qrcode.html#create-a-qr-code | ||
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== API == | == API == |
2022年6月28日 (火) 12:53時点における版
https://docs.lvgl.io/8.2/libs/qrcode.html
英文 | 自動翻訳 |
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QR code
QR code generation with LVGL. Uses QR-Code-generator by nayuki.
Get started
- Download or clone this repository
- Download from GitHub
- Clone: git clone https://github.com/lvgl/lv_lib_qrcode.git
- Include the library:
#include "lv_lib_qrcode/lv_qrcode.h"
- Test with the following code:
const char * data = "Hello world"; /*Create a 100x100 QR code*/ lv_obj_t * qr = lv_qrcode_create(lv_scr_act(), 100, lv_color_hex3(0x33f), lv_color_hex3(0xeef)); /*Set data*/ lv_qrcode_update(qr, data, strlen(data));
Notes
- QR codes with less data are smaller, but they scaled by an integer number to best fit to the given size.
Example
Create a QR Code
API
Functions
- lv_obj_t *lv_qrcode_create(lv_obj_t *parent, lv_coord_t size, lv_color_t dark_color, lv_color_t light_color)[1]
- Create an empty QR code (an
lv_canvas
) object.- Parameters
-
- parent -- point to an object where to [2]create the QR code
- size -- width and height of the QR code
- dark_color -- dark color of the QR code
- light_color -- light color of the QR code
- Returns
- pointer to the created QR code object
- lv_res_t lv_qrcode_update(lv_obj_t *qrcode, const void *data, uint32_t data_len)[3]
- Set the data of a QR code object
- Parameters
-
- qrcode -- pointer to aQ [4]code object
- data -- data to display
- data_len -- length of data in bytes
- Returns
- LV_RES_OK: if no error; LV_RES_INV: on error
- void lv_qrcode_delete(lv_obj_t *qrcode)[5]
- DEPRECATED: Use normal lv_obj_del i[6]nstead Delete a QR code object
- Parameters
- qrcode -- pointer to a QR code object
Variables
- const lv_obj_class_t lv_qrcode_class