no matching function for call to 'QStringList::filter(QCharRef)'
时间: 2023-09-22 20:07:27 浏览: 29
这个错误是因为`QStringList::filter()`函数的参数应该是一个`QChar`类型,而你传递了一个`QCharRef`类型的参数。
你需要将参数改为`QChar`类型,或者使用`QChar`类型的变量来代替`QCharRef`类型的参数。例如:
```cpp
QChar ch = 'a';
QStringList list = {"apple", "banana", "orange"};
QStringList filteredList = list.filter(ch);
```
相关问题
no matching function for call to QString::arg()’
这个错误通常发生在使用QString类中的arg()函数时,传入的参数类型与函数所需的参数类型不匹配。请确保传入的参数类型与函数所需的参数类型一致。
例如,如果你想使用arg()函数将一个整数类型的变量转换为QString类型,可以这样做:
```
int num = 10;
QString str = "The number is: %1";
str = str.arg(num);
```
如果你传入的参数类型不是整数类型,那么就会出现上述错误。你可以检查一下传入的参数类型是否正确,或者提供更多的代码信息,以便我更好地帮助你解决这个问题。
no matching function for call to widget::connect
This error message typically occurs in Qt when you try to connect a signal to a slot, but the arguments of the signal and the slot do not match. To fix it, you need to make sure that the arguments of the signal and the slot are compatible.
For example, if you have a signal that takes an integer parameter and a slot that takes a string parameter, you will get this error message. To fix it, you either need to change the signal to take a string parameter or change the slot to take an integer parameter.
Here's an example of how to connect a signal to a slot with compatible arguments:
```
QObject::connect(sender, &Sender::valueChanged, receiver, &Receiver::updateValue);
```
In this example, the signal "valueChanged" takes an integer parameter and the slot "updateValue" also takes an integer parameter, so they are compatible. If your code is still giving you the "no matching function for call to widget::connect" error message, double-check the arguments of the signal and the slot to make sure they match.