![](/img/trans.png)
[英]Generate thumbnail image from PDF file that is located in SharePoint Server?
[英]Using node-thumbnail to generate thumbnail from image
我正在尝试使用node-thumbnail从图像生成缩略图,该缩略图正在上载到Azure存储中的容器中,但看起来像原始文件,而不是缩略图。 这是我的代码,首先我要上传原始图像,然后读取它并从中生成缩略图,然后将缩略图上传到容器。 我究竟做错了什么? 我在网上找不到太多有关如何执行此操作的资源,请帮忙!
app.post('/upload', function(req, res) {
if (!req.files)
return res.status(400).send('No files were uploaded.');
// The name of the input field (i.e. "sampleFile") is used to retrieve the uploaded file
let sampleFile = req.files.sampleFile;
let name = sampleFile.name;
let data = sampleFile.data;
//var options = { contentSettings: { contentType: 'image/jpeg' } }
blobSvc.createBlockBlobFromText('test-container', name, data, function(error, result, response){
if (error){
return res.status(500).send(error);
} else {
console.log('Uploaded to container');
}
var info = blobSvc.getBlobToLocalFile ("test-container", name, name,
function (error, blockBlob, response) {
thumb({
source: name, // could be a filename: dest/path/image.jpg
destination: './',
concurrency: 4,
width: 100
}, function(files, err){
if (err) throw err;
console.log("resized");
//Delete the downloaded BIG one
//Upload the thumbnail
blobSvc.createBlockBlobFromLocalFile("test-container", files[0].dstPath, files[0].dstPath,
function (error, blockBlob, response) {
if (!error) {
console.log("thumbnail uploaded: " + name);
} else{
console.log(error);
}
});
});
});
});
这实际上不是Azure存储问题,而更多是node-thumbnail
问题。
如何使用Jimp
:
var azure = require('azure-storage');
var Jimp = require("jimp");
var path = require('path');
// ...
var info = blobSvc.getBlobToLocalFile("test-container", name, name, function(error, blockBlob, response) {
if (!error) {
var dstName = path.parse(name).name + "_thumb" + path.parse(name).ext;
Jimp.read(name, function(err, image) {
if (err) throw err;
image.resize(100, Jimp.AUTO) // resize
.quality(60) // set JPEG quality
.write(dstName, function(err, ret) { // save
//Upload the thumbnail
blobSvc.createBlockBlobFromLocalFile("test-container", dstName, dstName, function(error, blockBlob, response) {
if (!error) {
console.log("thumbnail uploaded: " + dstName);
} else {
console.log(error);
}
});
});
});
}
});
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.