D:\programming\Qt\musicPlayer\widget.cpp:48: error: 'path' was not declared in this scope; did you mean 'std::filesystem::__cxx11::path'? ..\musicPlayer\widget.cpp: In member function 'void Widget::on_pushButton_clicked()': ..\musicPlayer\widget.cpp:48:45: error: 'path' was not declared in this scope; did you mean 'std::filesystem::__cxx11::path'? 48 | playList.append(QUrl::fromLocalFile(path+"/"+file)); | ^~~~ | std::filesystem::__cxx11::path
时间: 2024-04-22 20:21:48 浏览: 11
这个错误提示是在你的 Qt 项目中,路径变量 `path` 没有被正确声明。编译器建议你是否是想使用 C++17 中的 `std::filesystem::__cxx11::path`。
你需要检查一下代码中 `path` 变量的声明是否正确,或者尝试在代码中添加 `#include <filesystem>` 头文件,以确保 `path` 能够被正确识别。如果你的编译器不支持 C++17 中的 `std::filesystem`,你可以考虑使用其他第三方库,如 boost::filesystem。
相关问题
a.cpp:44:9: error: 'wprintf' was not declared in this scope; did you mean 'dprintf'?
这个错误提示表明在您的代码中使用了`wprintf`函数,但是编译器无法识别它。这可能是因为您没有包含正确的头文件或使用了错误的函数名。
`wprintf`是一个广泛使用的C++函数,用于输出格式化的Unicode字符串。要使用它,您需要在代码中包含`<cstdio>`头文件。
如果您已经包含了正确的头文件,那么可能是因为您使用了错误的函数名。您可以尝试使用`printf`函数来代替`wprintf`,因为它们都可以用于输出格式化字符串。如果您确实需要使用`wprintf`,请确保在代码中包含正确的头文件,并且使用正确的函数名。
26 32 D:\编程\2.1.cpp [Error] 'endl' was not declared in this scope
This error message suggests that the program is trying to use the `endl` keyword, which is typically used in C++ to insert a newline character into the output stream, but the keyword has not been declared or defined in the current scope.
To fix this error, you can include the `<iostream>` header file at the beginning of the program, which contains the definition for `endl`, or you can use the newline character `\n` instead of `endl`.
For example, you can modify your code as follows:
```c++
#include <iostream>
using namespace std;
int main() {
cout << "Hello, world!" << endl; // or replace endl with \n
return 0;
}
```
This should resolve the error and allow the program to compile successfully.