nodejs在缓冲区和字符串之间转换图像 [英] nodejs convert image between buffer and string

问题描述

我想将png图像从 buffer 转换为 string ，然后将字符串转换为buffer.

i want to convert png image from buffer to string, and then convert string to buffer.

fs.readFile('/Users/xxx/Desktop/1.png', (err, data) => {
    if (err) throw err; // Fail if the file can't be read.
    data = Buffer.from(data)
    let str = data.toString()
    data = Buffer.from(str)
});

// server
router.register('/api/dump', (request, response) => { 
    fs.readFile('/Users/xxx/Desktop/1.png', (err, data) => {
        if (err) throw err; // Fail if the file can't be read. 
        response.writeHead(200, {'Content-Type': 'image/jpeg'}); 
        response.end(data); // Send the file data to the browser.
    });
}) 

// front
this.$get('/dump').then(result => {
    // i want to convert result to buffer
})

但是新缓冲区不再是旧缓冲区.

but the new buffer is not old buffer any more.

推荐答案

Buffer.toString()的默认编码为 utf8 ，并且您无法从转换> utf8 返回 Buffer ，而不会破坏图像.

Buffer.toString() default encoding is utf8, and you can't convert from utf8 back to Buffer without breaking the image.

如果要转换为字符串，然后再返回到缓冲区，则需要使用允许该编码的编码，例如 base64 .

If you want to convert to string, and then back to buffer, you will need to use an encoding that allows this, for example base64.

fs.readFile('/Users/yihchu/Desktop/1.png', (err, data) => {
    if (err) throw err; // Fail if the file can't be read.
    var oldData = data;
    let str = data.toString('base64')
    data = Buffer.from(str, 'base64');
});

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