file.open(QIODevice::ReadOnly)
时间: 2024-05-08 09:16:28 浏览: 16
This line of code opens a file in read-only mode. The file is specified by the argument passed to the function, which is typically a file path or a file object. Once the file is opened, its contents can be read, but it cannot be modified or written to.
Example:
```python
file = QFile('example.txt')
if file.open(QIODevice.ReadOnly):
# read the contents of the file
data = file.readAll()
# close the file
file.close()
else:
print("Could not open file")
```
In this example, a file named "example.txt" is opened in read-only mode using the `open()` method of the `QFile` class. If the file is successfully opened, its contents are read using the `readAll()` method and stored in the `data` variable. Finally, the file is closed using the `close()` method. If the file cannot be opened, an error message is printed.