Win32文件操作函数简介

最新推荐文章于 2022-12-01 21:31:41 发布

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最新推荐文章于 2022-12-01 21:31:41 发布

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文章标签： attributes file asynchronous structure function application

本文链接：https://blog.youkuaiyun.com/fei8603/article/details/1832275

本文详细介绍了Windows操作系统中用于文件操作的三个核心API：CreateFile用于创建或打开文件及各种资源；ReadFile用于从文件中读取数据，并可根据读取的数据调整文件指针的位置；WriteFile则用于将数据写入文件，同样可以根据写入的数据量调整文件指针位置。这些API支持同步及异步操作。

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一、CreateFile

The CreateFile function creates or opens the following objects and returns a handle that can be used to access the object:

files
pipes
mailslots
communications resources
disk devices (Windows NT only)
consoles
directories (open only)

HANDLE CreateFile(
  LPCTSTR lpFileName,          // pointer to name of the file
  DWORD dwDesiredAccess,       // access (read-write) mode
  DWORD dwShareMode,           // share mode
  LPSECURITY_ATTRIBUTES lpSecurityAttributes,
                               // pointer to security attributes
  DWORD dwCreationDisposition,  // how to create
  DWORD dwFlagsAndAttributes,  // file attributes
  HANDLE hTemplateFile         // handle to file with attributes to 
                               // copy
);

二、ReadFile
The ReadFile function reads data from a file, starting at the position indicated by the file pointer. After the read operation has been completed, the file pointer is adjusted by the number of bytes actually read, unless the file handle is created with the overlapped attribute. If the file handle is created for overlapped input and output (I/O), the application must adjust the position of the file pointer after the read operation. 
BOOL ReadFile(
  HANDLE hFile,                // handle of file to read
  LPVOID lpBuffer,             // pointer to buffer that receives data
  DWORD nNumberOfBytesToRead,  // number of bytes to read
  LPDWORD lpNumberOfBytesRead, // pointer to number of bytes read
  LPOVERLAPPED lpOverlapped    // pointer to structure for data
);

三、WriteFile
The WriteFile function writes data to a file and is designed for both synchronous and asynchronous operation. The function starts writing data to the file at the position indicated by the file pointer. After the write operation has been completed, the file pointer is adjusted by the number of bytes actually written, except when the file is opened with FILE_FLAG_OVERLAPPED. If the file handle was created for overlapped input and output (I/O), the application must adjust the position of the file pointer after the write operation is finished. 
BOOL WriteFile(
  HANDLE hFile,                    // handle to file to write to
  LPCVOID lpBuffer,                // pointer to data to write to file
  DWORD nNumberOfBytesToWrite,     // number of bytes to write
  LPDWORD lpNumberOfBytesWritten,  // pointer to number of bytes written
  LPOVERLAPPED lpOverlapped        // pointer to structure for overlapped I/O
);