我正在尝试将图像写入csv文件。脚本写入了文件,但图像的内容被打乱了。CCD_ 1的长序列。有人能指出我在编码中遗漏了什么吗?或者我应该做其他事情吗?
要测试:mkdir so-38711430; cd so-38711430; npm init -y; npm i -S lodash json2csv;
'use strict';
const _ = require('lodash');
const json2csv = require('json2csv');
const fs = require('fs');
let rows = [
{
'id': 1,
'name': '12323',
},
{
'id': 2,
'name': '22323',
},
{
'id': 3,
'name': '323232',
},
{
'id': 4,
'name': '24242',
},
];
// image path is valid
fs.readFile(`./images/2NTSFr7.jpg`, 'utf-8', (err, data) => {
_.each(rows, (item) => {
item.image = data;
});
json2csv({
'data': rows
}, (err, csv) => {
fs.writeFile('file.csv', csv, (err) => {
if (err) throw err;
console.log('file saved');
});
});
});
这取决于如何呈现CSV/XLSX文档。
在CSV中,如果您在记事本中打开文档,显然不会看到图像。记事本不会渲染图像,只渲染文本。正如其他人所说,您可以用base64
字符串将其写入CSV,例如使用node-base64-image和jQuery CSV:
import {encode, decode} from 'node-base64-image'; // ES6
// Get the image as base64 string
var base64string = encode("path/to/img");
// Create an arrays object, to convert to CSV
// Note this is an array of arrays. E.g.,
// For an array:
// array = [ "a", "b", "c" ],
// you get the third element by doing:
// array[2] ( = "c" )
//
// So, for an array of arrays, i.e., 3 arrays containing 3 elements each:
// arrayOfArrays = [ [ "a", "b", "c" ],[ "d", "e", "f" ], [ "g", "h", "i" ] ]
// you get the third element by doing (as above):
// array[2] ( = [ "g", "h", "i" ] )
// and the third element of the selected array by doing:
// array[2][2] ( = "i" )
var csvArrays = [
[ "Image Name", "Image base64 Data" ], // Example titles row
[ "name-for-image", base64string ], // Example data row
];
// Convert arrays to CSV
var csvData = $.csv.fromArrays(csvArrays);
// Write the file!
fs.writeFile('csvFile.csv', csvData, (err) => {
if (err) throw err;
console.log('It's saved!');
});
编辑:然后从CSV文件中解码,我们可以获得我们之前保存的CSV文件:
import {encode, decode} from 'node-base64-image'; // ES6
var csvFile = fs.readFile('csvFile.csv');
var csvDataAsArrays = $.csv.toArrays(csvFile);
// Get the second array from the group of arrays, then the second element from that array, hence `[1][1]`
var csvImgAsBase64 = csvDataAsArrays[1][1];
var imgAsData = decode(csvImgAsBase64);
fs.writeFile("img.jpeg", imgData, function() {
if (err) throw err;
console.log('It's saved!');
}
在XLSX中,您可以根据需要插入图像,然后在Excel中打开工作簿以查看图像。以下是如何使用ExcelforNode包做到这一点:
ws.addImage({
path: './screenshot2.jpeg',
type: 'picture',
position: {
type: 'absoluteAnchor',
x: '1in',
y: '2in'
}
});
您也可以将其相对于单元格定位:
ws.addImage({
path: './screenshot1.png',
type: 'picture',
position: {
type: 'twoCellAnchor',
from: {
col: 1,
colOff: 0,
row: 10,
rowOff: 0
},
to: {
col: 4,
colOff: 0,
row: 13,
rowOff: 0
}
}
});