async () => { try { const dataUrl = await blobToDataURL(blob); setImageUrl(dataUrl); } catch (error) { console.error('Error converting Blob to DataURL:', error); } }; convertBlobToImage(); }, [blob]); return <im
return canvas.toDataURL(format||'image/jpeg', quality||1.0); } // DataURL转canvas function dataURLToCanvas(dataurl, cb){ var canvas = document.createElement('CANVAS'); var ctx = canvas.getContext('2d'); var img = new Image(); img.onload = function(){ canvas.width = img.width; ca...
AI代码解释 1.DataURL方式:2.Blob方式:// 1.DataURL方式:asyncfunctionselectFileForDataURL(){constreader=newFileReader();reader.onload=function(){constoutput=document.querySelector("#output1")output.src=reader.result;}reader.readAsDataURL(event.target.files[0]);}//2.Blob方式:asyncfunctionselectFile...
假设我们有一张名为images的表,其中包含一个Blob类型的字段image_data,我们需要将Blob数据转换为Base64编码的字符串存储到另一个字段image_base64中。 -- 创建表imagesCREATETABLEimages(idINTPRIMARYKEY,image_dataBLOB,image_base64TEXT);-- 将Blob数据转换为Base64编码的字符串UPDATEimagesSETimage_base64=TO_BASE...
let compressedDataURL = await compress(reader.result, 90, 'image/jpeg'); // 压缩后将base64转为Blob 对象减少传输数据量 let compressedImageBlob = dataUrlToBlob(compressedDataURL); uploadFile('https://httpbin.org/post', compressedImageBlob); ...
link.href = URL.createObjectURL(blob) link.click() // delete the internal blob reference, to let the browser clear memory from it URL.revokeObjectURL(link.href)}, 'image/png')// 或者使用 async 获取 blobconst blob = await new Promise(resolve => canvasElem.toBlob(resolve, 'image/png...
(); reader.onload = async function () { let compressedDataURL = await compress( reader.result, 90, "image/jpeg" ); let compressedImageBlob = dataUrlToBlob(compressedDataURL); uploadFile("https://httpbin.org/post", compressedImageBlob); }; reader.readAsDataURL(event.target.files[0]); };...
--to_lob 只能用在CTAS,和 insert select 中 SQL> l 1 declare 2 v_id int; 3 v_img raw; 4 begin 5 select "id","img" into v_id,v_img from imgtest@lnk_mssql; 6 insert into anbob.imgtest values(v_id,to_lob(v_img));
一些场景,比如canvas获取的图片,或者微信开发sdk返回的图片格式是data:img格式的,我们需要上传到服务器上,那就需要进行转化。 将dataURL转成Blob // base64 转 blob dataURItoBlob(dataURI) { // convert base64/URLEncoded data component to raw binary data held in a string ...
// ... function definition objectapp.storageBlob('process-blob-image', {// removed for brevity// Data to insert into Cosmos DBconstid = uuidv4().toString();constanalysis =awaitanalyzeImage(blobUrl);// `type` is the partition keyconstdataToInsertToDatabase = { id,type:'image', blobUrl...