Cannot read file_storage

这个错误通常出现在使用OpenCV的FileStorage类时，可能是因为文件路径或文件权限不正确导致无法读取文件。以下是一些可能的解决方法：

1. 确保文件路径正确：检查文件路径是否正确，并确保文件存在于指定位置。如果文件不存在，请创建一个新文件。

2. 检查文件权限：确保你有权限访问该文件。如果你没有权限，可能需要更改文件权限或以管理员身份运行程序。

3. 检查文件格式：确保你正在尝试读取正确的文件格式。例如，如果你尝试读取XML文件，但文件实际上是YAML格式，则会出现此错误。

4. 检查代码：确保你的代码正确地使用了FileStorage类。你可以查看OpenCV文档来了解如何正确使用FileStorage类。

希望这些方法可以帮助你解决问题。

相关问题

Cannot resolve symbol 'WRITE_EXTERNAL_STORAGE'

This error message usually occurs when the WRITE_EXTERNAL_STORAGE permission is not declared in the AndroidManifest.xml file or it is not imported in the Java file. To resolve this issue, follow these steps:

1. Open the AndroidManifest.xml file and add the following line of code within the <manifest> tag:

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

2. If the above step does not resolve the issue, then check if the import statement for WRITE_EXTERNAL_STORAGE is added to the Java file. Add the following line of code at the beginning of the file:

import android.Manifest;

3. If the issue still persists, try cleaning the project and rebuilding it.

Once you have followed these steps, the error message should disappear and you should be able to use the WRITE_EXTERNAL_STORAGE permission without any issues.

Cannot resolve symbol 'MANAGE_EXTERNAL_STORAGE'

This error typically occurs when trying to use the MANAGE_EXTERNAL_STORAGE permission in an Android app targeting API level 29 or higher. This permission was introduced in Android 11 and allows an app to manage all files on external storage, including deleting, modifying, and creating new files.

To resolve this error, you can do the following:

1. Make sure your app is targeting API level 30 or higher. The MANAGE_EXTERNAL_STORAGE permission is only available on Android 11 and higher.

2. Add the following permission to your app's AndroidManifest.xml file:
<uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE" />

3. If you're using Android Studio, make sure you have the latest version installed and that your project is using the latest build tools.

4. If you're still encountering the error, try cleaning and rebuilding your project.

Note that the MANAGE_EXTERNAL_STORAGE permission is considered a sensitive permission and requires a special declaration in your app's manifest file. You'll also need to provide a justification for why your app needs this permission when submitting it to the Google Play Store.