How to delete a file using C++?

How to delete files in C++? Use the remove function to delete files, its prototype is int remove(const char* filename); use std::filesystem::remove function to delete files, its prototype is std::error_code remove(const std::filesystem::path& path);

How to delete files in C++

C++ provides various functions and methods to delete files. In this article, we will introduce how to use the remove function and the std::filesystem::remove function to delete files, and provide a practical case.

remove Function

remove function is a function defined in the C++ standard library and is used to delete files. Its prototype is as follows:

int remove(const char* filename);

where:

• filename is the path of the file to be deleted.

remove The function returns an integer indicating the status of the operation:

• 0 indicates successful deletion.
• A non-0 value indicates deletion failure.

Practical case: Use the remove function to delete files

The following is a example of using the remove function to delete files Code example:

#include <cstdio>

int main() {
  // 要删除的文件路径
  const char* filename = "test.txt";

  // 删除文件
  int result = remove(filename);

  // 检查操作结果
  if (result == 0) {
    printf("文件 %s 删除成功！\n", filename);
  } else {
    printf("文件 %s 删除失败，错误码：%d\n", filename, result);
  }

  return 0;
}

std::filesystem::remove Function

Introduced in the C++ standard library of C++17 and later versions Added the std::filesystem header file, which provides a more modern and high-level API for file system operations. We can use the std::filesystem::remove function to delete files. Its prototype is as follows:

std::error_code remove(const std::filesystem::path& path);

where:

• path is the path of the file to be deleted.

std::filesystem::remove The function returns a std::error_code object representing the status of the operation. We can use the std::error_code::value() method to get the error code.

Practical case: Use std::filesystem::remove function to delete files

The following is a usestd::filesystem: Code example for :remove function to delete files:

#include <filesystem>

int main() {
  // 要删除的文件路径
  std::filesystem::path filename = "test.txt";

  // 删除文件
  std::error_code ec;
  std::filesystem::remove(filename, ec);

  // 检查操作结果
  if (!ec) {
    std::cout << "文件 " << filename << " 删除成功！" << std::endl;
  } else {
    std::cout << "文件 " << filename << " 删除失败，错误码：" << ec.value() << std::endl;
  }

  return 0;
}

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