qstringlist判断是否为空
时间: 2023-11-08 17:46:48 浏览: 560
要判断QStringList是否为空,可以使用isEmpty()函数。isEmpty()函数返回一个布尔值,如果QStringList为空,则返回true;否则返回false。以下是一个示例代码:
```cpp
QStringList list;
// 添加一些元素到QStringList中
if (list.isEmpty()) {
qDebug() << "QStringList is empty";
} else {
qDebug() << "QStringList is not empty";
}
```
在上面的示例中,如果QStringList为空,则会输出"QStringList is empty";否则会输出"QStringList is not empty"。
相关问题
qt 判断QStringList是否为空
### Qt 中检查 `QStringList` 是否为空
在 Qt 编程环境中,为了验证 `QStringList` 是否为空,可以调用成员函数 `isEmpty()`。此方法返回布尔值,如果列表不包含任何项,则返回 true;否则返回 false[^3]。
```cpp
bool isTheListEmpty(const QStringList& list) {
return list.isEmpty();
}
```
对于希望进一步确认列表大小的情况,还可以使用 `count()` 或者 `size()` 函数来获取列表中的元素数量。当这些函数的结果等于零时,意味着该 `QStringList` 是空的。
```cpp
int checkListSize(const QStringList& list) {
int size = list.size(); // or use count()
return size;
}
if (checkListSize(myStringList) == 0) {
qDebug() << "The string list is empty.";
} else {
qDebug() << "The string list contains items.";
}
```
qstringlist 判空
QStringList判空可以使用isEmpty()函数。如果QStringList为空,isEmpty()函数会返回true,否则返回false。例如:QStringList myList; // 创建一个空的QStringList
if(myList.isEmpty()) { // 判断QStringList是否为空
// do something if QStringList is empty
}
引用中提到了QString isEmpty()函数的用法,同样适用于QStringList。<em>1</em><em>2</em><em>3</em>
#### 引用[.reference_title]
- *1* *3* [QT开发笔记(一)](https://blog.csdn.net/m0_49507996/article/details/125810714)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v92^chatsearchT3_1"}} ] [.reference_item]
- *2* [QString判断空 isEmpty](https://blog.csdn.net/zhangxuechao_/article/details/81945688)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v92^chatsearchT3_1"}} ] [.reference_item]
[ .reference_list ]
阅读全文
相关推荐















