nodejs中JIMP中的文件签名无效 [英] Invalid file signature in JIMP in nodejs
问题描述
我正在使用JIMP将我的图像转换为灰度并降低其质量。但是对于2%的情况,它会破坏我的图像并在控制台中抛出错误 -
错误:文件签名无效
at Parser._parseSignature(C:\ Users \ Akshay \Desktop\darwin\\\
ode_modules\pngjs
\lib \ parser.js:50:18)
如果有问题的代码如下:
I am using JIMP to convert my image to greyscale and to reduce its quality.But for 2% of the cases it is corrupting my image and throwing an error in the console- "Error: Invalid file signature at Parser._parseSignature (C:\Users\Akshay\Desktop\darwin\node_modules\pngjs \lib\parser.js:50:18)" Below if the problematic code:
var ext=path.extname(dest);
if(ext!='.jpg'){
dest=replaceExt(dest, '.jpg');
}
console.log(path.extname(dest));
var file = fs.createWriteStream(dest);
////console.log(url)
if(url.indexOf('https')!=-1){
//console.log("https")
var request = https.get(url, function(response) {
response.pipe(file);
file.on('finish', function() {
Jimp.read(dest).then(function (lennaa) {
lennaa.resize(256, 256) // resize
.quality(90) // set JPEG quality
.greyscale() // set greyscale
.write(dest); // save
}).catch(function (err) {
console.error(err);
});
file.close(cb); // close() is async, call cb after close completes.
});
}).on('error', function(err) { // Handle errors
fs.unlink(dest); // Delete the file async. (But we don't check the result)
if (cb) cb(err.message);
});
}
推荐答案
我遇到了同样的问题似乎问题在于,尽管我们付出了最大的努力,之前的文件仍未完成写作。
I faced the same and it seems that the issue is that the previous file is still not finished writing, despite our best effort.
所以我以一种愚蠢,可耻的方式做了这件事,并增加了一半 - 读取失败时的第二次延迟。
So I did it in a dumb, shameful way and added a half-second delay in case the read fails.
let image;
try {
image = await Jimp.read(filepath);
} catch (error) {
debug(`Error reading ${filepath}. But we'll try again!`);
// Wait half second, try again. What an ugly hack. It might as well work.
let temp = await new Promise(resolve => setTimeout(resolve, 600));
try {
image = await Jimp.read(filepath);
debug('Success reading file on second attempt!');
} catch (error2) {
// If totally failed, at least exit gracefully:
this.session.send('The bot is a little busy now. Please try again.');
this.session.endDialog();
}
}
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