[英]Blob from javascript binary string
I have a binary string created with FileReader.readAsBinaryString(blob).
我有一个用
FileReader.readAsBinaryString(blob).
创建的二进制字符串FileReader.readAsBinaryString(blob).
I want to create a Blob with the binary data represented in this binary string. 我想用这个二进制字符串表示的二进制数据创建一个Blob。
Is the blob that you used not available for use anymore? 您使用的blob不再可用吗?
Do you have to use readAsBinaryString
? 你必须使用
readAsBinaryString
吗? Can you use readAsArrayBuffer
instead. 你可以使用
readAsArrayBuffer
? With an array buffer it would be much easier to recreate the blob. 使用数组缓冲区,重建blob会更容易。
If not you could build back the blob by cycling through the string and building a byte array then creating a blob from it. 如果没有,你可以通过在字符串中循环并构建一个字节数组然后从中创建一个blob来构建blob。
$('input').change(function(){ var frb = new FileReader(); frb.onload = function(){ var i, l, d, array; d = this.result; l = d.length; array = new Uint8Array(l); for (var i = 0; i < l; i++){ array[i] = d.charCodeAt(i); } var b = new Blob([array], {type: 'application/octet-stream'}); window.location.href = URL.createObjectURL(b); }; frb.readAsBinaryString(this.files[0]); });
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script> <input type="file">
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