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[英]How do I convert readable image stream into base64 without saving locally
[英]How do I transfer base64 data into a readable image stream without saving locally
我正在使用Node.js處理Microsoft Bot Framework(在Azure上托管),並且不能在本地保存文件。 我具有base64格式的圖像數據,並且需要將該數據傳輸到圖像文件的可讀流中,可以使用其Blob存儲API(采用流)將其泵送到Azure中。
var base64ImageData; //my base64 image
//Create myStream here
//Then send to Azure
blobService.createBlockBlobFromStream('mycontainer',
nameForBlob, myStream, fileSize,
function (error, result, response){
if(!error)
console.log(response);
else
console.log(error)
});
任何幫助,將不勝感激。 我不知道如何在不將jpg保存到磁盤的情況下解碼base64並從中進行流處理。
請嘗試這樣的事情:
var azureStorage = require('azure-storage');
var streamifier = require('streamifier');
var base64String = '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';
var blobService = azureStorage.createBlobService('account-name',
'account-key');
var buffer = Buffer.from(base64String, 'base64');
var stream = streamifier.createReadStream(buffer);
blobService.createBlockBlobFromStream('container-name', 'checked.png', stream, buffer.byteLength, function(error, response) {
if (error) {
console.log('Error!');
console.log(error);
} else {
console.log('Blob uploaded successfully!');
console.log(response);
}
});
我必須安裝streamifier
節點程序包才能將緩沖區轉換為流。
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