https://docs.lvgl.io/8.2/libs/qrcode.html
QR code
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自動翻訳
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QR code generation with LVGL. Uses QR-Code-generator by nayuki.
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Get started
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自動翻訳
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- 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));
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Notes
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自動翻訳
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- QR codes with less data are smaller, but they scaled by an integer number to best fit to the given size.
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Example
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自動翻訳
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Create a QR Code
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API
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自動翻訳
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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)
- Create an empty QR code (an
lv_canvas) object.
- Parameters
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- parent -- point to an object where to 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)
- Set the data of a QR code object
- Parameters
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- qrcode -- pointer to aQ 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)
- DEPRECATED: Use normal lv_obj_del instead Delete a QR code object
- Parameters
- qrcode -- pointer to a QR code object
Variables
- const lv_obj_class_t lv_qrcode_class
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