小编M.K*_*lik的帖子

1. 我试过 flutter clean
2. flutter pub cache repair,
3. 更改 fluttertoast 包的版本和版本，并删除它，
4. 删除android/.gradle目录并重新构建。

没有任何效果。

Launching lib\main.dart on Redmi Note 4 in debug mode...
lib\main.dart:1
Parameter format not correct -
e: C:\src\flutter\.pub-cache\hosted\pub.dartlang.org\fluttertoast-7.1.8\android\src\main\kotlin\io\github\ponnamkarthik\toast\fluttertoast\MethodCallHandlerImpl.kt: (45, 84): Unresolved reference: R
e: C:\src\flutter\.pub-cache\hosted\pub.dartlang.org\fluttertoast-7.1.8\android\src\main\kotlin\io\github\ponnamkarthik\toast\fluttertoast\MethodCallHandlerImpl.kt: (70, 68): Unresolved reference: R
e: C:\src\flutter\.pub-cache\hosted\pub.dartlang.org\fluttertoast-7.1.8\android\src\main\kotlin\io\github\ponnamkarthik\toast\fluttertoast\MethodCallHandlerImpl.kt: (85, 64): Unresolved reference: R
2

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':fluttertoast:compileDebugKotlin'.
> Compilation error. See log for more details

* Try:
Run with --stacktrace …

我正在使用nodejs发送文件流来表达响应

var fileReadStream = fs.createReadStream(filePath);
fileReadStream.pipe(res);

问题是，在前端，文件只能通过“下载”来下载，并且没有扩展名。这使得该文件无法使用（因为没有扩展名）。