我们可以使用 readAsBytes 方法来读取图片文件,然后使用 Image.memory 构造函数来创建一个图片控件。 import 'dart:io'; import 'package:flutter/material.dart'; void main() async { var file = File('path_to_your_image_file'); var bytes = await file.readAsBytes(); var image = Image.memory(byt...
String url) async {var request = http.MultipartRequest('POST', Uri.parse(url));request.files.add(http.MultipartFile.fromBytes('file', chunk));var response = await request.send();if (response.statusCode == 200) {print('Uploaded!');} else {print('Failed to upload.');}} ...
byteData=awaitimage.toByteData(format:ImageByteFormat.png);if(byteData!=null){File file=File(r"E:\Temp\desk\box.png");file.writeAsBytes(byteData.buffer.asUint8List());}} 通过这种方式绘制生成图片,好处是可以自由操作 Canvas 的绘制内容,而且必依赖于组件,只要在任何需要的地方触发方法即可。如下...
图片final http.Response response=awaithttp.get(Uri.parse(_url));// 获取临时的文件夹final dir=awaitgetTemporaryDirectory();// 创建一个图像名称varfilename='${dir.path}/SaveImage${random.nextInt(100)}.png';// 保存到文件系统final file=File(filename);awaitfile.writeAsBytes(response.bodyBytes)...
StringtoHmacSha1Base64(Stringsk){varhmacSha1=Hmac(sha1,utf8.encode(sk));returnbase64.encode(hmacSha1.convert(utf8.encode(this)).bytes);} 请求头封装好后调用 dio 的 put 方法进行上传,上传成功后组装OBSResponse进行返回。 这样通用的对象上传方法就完成了,接下看看putObject和putFile的实现: ...
// 方法一,file文件final a =html.AnchorElement(href: imgPath.path); a.download= '图片.png'; a.click(); a.remove(); // 方法二,base64 Uint8List bytes = base64.decode(imgBase64); final blob = html.Blob([bytes], 'image/jpeg'); ...
saveImgsToAppdir()async{// 原理简单,就是先从项目资源里把图片读出来,然后写进appdir的新建图片文件里ByteData bytes1 =awaitrootBundle.load("images/pdfLogo.png");File pngFile1 = File("${appDir.path}/pdfLogo.png");pngFile1.writeAsBytes(bytes1.buffer.asUint8List());} ...
final imageContent = await pickedFile!.readAsBytes(); fileName = pickedFile.name; tempFile = File(pickedFile.path); fileContent = imageContent; html.Node? inputElem; inputElem = html.document .getElementById("__image_picker_web-file-input") ?.querySelector("input"); final convID...
PlatformFile file = result.files.first; print(file.name); print(file.bytes); print(file.size); print(file.extension); print(file.path); } else { // User canceled the picker } For full usage details refer to theWikiabove. Example App ...
(PlatformFile file, InsertFileType type) async { print(); //filename print(file.size); //size in bytes print(file.extension); //file extension (eg jpeg or mp4) return true; }, ), otherOptions: OtherOptions(height: 700), callbacks: Callbacks(onBeforeCommand: (String? currentHtml) { ...