d处理文件

原文

打开和关闭文件

import core.stdc.errno;
import std.exception;
import std.stdio;

void main(string[] args)
{
	try
	{
		auto file = File("test.txt", "r");
		file.close();
	}
	catch (ErrnoException ex)
	{
		switch(ex.errno)
		{
			case EPERM:
			case EACCES:
				break;

			case ENOENT:
				break;

			default:
				break;
		}
	}
}

文件中查找位置

import std.exception;
import std.stdio;

void main(string[] args)
{
	try
	{
		auto file = File("test.txt", "r");

		file.seek(10, SEEK_SET);

		file.seek(-2, SEEK_CUR);

		file.seek(-4, SEEK_END);

		auto pos = file.tell();

		file.rewind();
	}
	catch (ErrnoException ex)
	{
	}
}

写入字节

import std.exception;
import std.stdio;

void main(string[] args)
{
	try
	{
		byte[] data = [0x68, 0x65, 0x6c, 0x6c, 0x6f];

		auto file = File("test.txt", "w");

		file.rawWrite(data);
	}
	catch (ErrnoException ex)
	{
	}
}

快速写入文件

import std.file;

void main(string[] args)
{
	try
	{
		write("test.txt", [0x68, 0x65, 0x6c, 0x6c, 0x6f]);
	}
	catch (FileException ex)
	{
	}
}

写行进文件

import std.exception;
import std.stdio;

void main(string[] args)
{
	try
	{
		auto file = File("test.txt", "w");

		file.write("1: Lorem ipsum\n");

		file.writeln("2: Lorem ipsum");

		file.writef("3: %s", "Lorem ipsum\n");

		file.writefln("4: %s", "Lorem ipsum");
	}
	catch (ErrnoException ex)
	{
	}
}

使用io缓冲.

import std.file;
import std.outbuffer;

void main(string[] args)
{
	auto buffer  = new OutBuffer();
	ubyte[] data = [0x68, 0x65, 0x6c, 0x6c, 0x6f];

	buffer.write(data);
	buffer.write(' ');
	buffer.write("world");

	try
	{
		write("test.txt", buffer.toBytes());
	}
	catch (FileException ex)
	{
	}
}

从文件中读取字节

import std.exception;
import std.stdio;

void main(string[] args)
{
	try
	{
		byte[] buffer;
		buffer.length = 1024;

		auto file = File("test.txt", "r");

		auto data = file.rawRead(buffer);
	}
	catch (ErrnoException ex)
	{
	}
}

快速读取文件

import std.file;

void main(string[] args)
{
	try
	{
		auto data = cast(byte[]) read("test.txt");
	}
	catch (FileException ex)
	{
	}
}

读取N字节

import std.file;

void main(string[] args)
{
	try
	{
		auto data = cast(byte[]) read("test.txt", 5);
	}
	catch (FileException ex)
	{
	}
}

分块读文件

import std.exception;
import std.stdio;

void main(string[] args)
{
	try
	{
		auto file = File("test.txt", "r");

		foreach (buffer; file.byChunk(1024))
		{
		}
	}
	catch (ErrnoException ex)
	{
	}
}

文件中读取行

import std.exception;
import std.stdio;

void main(string[] args)
{
	try
	{
		auto file = File("test.txt", "r");
		string line;

		while ((line = file.readln()) !is null)
		{
		}
	}
	catch (ErrnoException ex)
	{
	}
}

缓冲为参的重载

import std.exception;
import std.stdio;

void main(string[] args)
{
	try
	{
		auto file = File("test.txt", "r");
		char[] buffer;

		while (file.readln(buffer))
		{
		}
	}
	catch (ErrnoException ex)
	{
	}
}

按系列行读取文件

import std.exception;
import std.stdio;

void main(string[] args)
{
	try
	{
		auto file = File("test.txt", "r");

		foreach (line; file.byLine)
		{
		}
	}
	catch (ErrnoException ex)
	{
	}
}

文件读为行

import std.file;
import std.utf;

void main(string[] args)
{
	try
	{
		auto utf8Data  = readText("test.txt");

		auto utf16Data = readText!(wstring)("test.txt");

		auto utf32Data = readText!(dstring)("test.txt");
	}
	catch (UTFException ex)
	{
	}
	catch (FileException ex)
	{
	}
}

创建空文件

import std.exception;

void main(string[] args)
{
	try
	{
		File("test.txt", "w");
	}
	catch (ErrnoException ex)
	{
	}
}

检查是否存在文件

import std.file;

void main(string[] args)
{
	if (exists("test.txt"))
	{
	}
}

重命名和移动文件

import std.file;

void main(string[] args)
{
	try
	{
		rename("source.txt", "destination.txt");
	}
	catch (FileException ex)
	{
	}
}

复制文件

import std.file;

void main(string[] args)
{
	try
	{
		copy("source.txt", "destination.txt");
	}
	catch (FileException ex)
	{
	}
}

删除文件

import std.file;

void main(string[] args)
{
	try
	{
		remove("test.txt");
	}
	catch (FileException ex)
	{
	}
}

获取文件信息

import std.file;
import std.stdio : writefln;

void main(string[] args)
{
	try
	{
		auto file = DirEntry("test.txt");

		writefln("名: %s", file.name);
		writefln("是目录: %s", file.isDir);
		writefln("是文件: %s", file.isFile);
		writefln("是符号链接: %s", file.isSymlink);
		writefln("大小: %s", file.size);
		writefln("最后访问时间: %s", file.timeLastAccessed);
		writefln("最后修改时间: %s", file.timeLastModified);
		writefln("属性: %b", file.attributes);
	}
	catch (FileException ex)
	{
	}
}

截断现有文件

import std.file;

void main(string[] args)
{
	auto file = "test.txt";
	auto size = 100;

	try
	{
		if (file.exists() && file.isFile())
		{
			write(file, read(file, size));
		}
	}
	catch (FileException ex)
	{
	}
}

创建zip文档

import std.file;
import std.outbuffer;
import std.string;
import std.zip;

void main(string[] args)
{
	try
	{
		auto file = new ArchiveMember();
		file.name = "test.txt";

		auto data = new OutBuffer();
		data.write("Lorem ipsum");
		file.expandedData = data.toBytes();

		auto zip = new ZipArchive();
		zip.addMember(file);

		write("test.zip", zip.build());
	}
	catch (ZipException ex)
	{
	}
}

读取zip文档

import std.file;
import std.zip;

void main(string[] args)
{
	try
	{
		auto zip = new ZipArchive(read("test.zip"));

		foreach (filename, member; zip.directory)
		{
			auto data = zip.expand(member);

		}
	}
	catch (ZipException ex)
	{
	}
}

写压缩

import std.file;
import std.zlib;

void main(string[] args)
{
	try
	{
		auto data = compress("Lorem ipsum dolor sit amet");

		write("test.dat", data);
	}
	catch (ZlibException ex)
	{
	}
}

读压缩

import std.file;
import std.zlib;

void main(string[] args)
{
	try
	{
		auto data = uncompress(read("test.dat"));

	}
	catch (ZlibException ex)
	{
	}
}

posix

import core.stdc.errno;
import core.sys.posix.sys.stat;
import std.conv;
import std.string;

void main(string[] args)
{
	auto file   = "test.txt";
	auto result = chmod(file.toStringz(), octal!(666));

	if (result != 0)
	{
		switch(errno)
		{
			case EPERM:
			case EACCES:
				break;

			case ENOENT:
				break;

			default:
				break;
		}
	}
}

更改文件的所有者

import core.stdc.errno;
import core.sys.posix.pwd;
import core.sys.posix.unistd;
import std.string;

void main(string[] args)
{
	auto username = "gary";
	auto file     = "test.txt";
	auto record   = getpwnam(username.toStringz());

	if (record !is null)
	{
		auto user   = record.pw_uid;
		auto group  = record.pw_gid;
		auto result = chown(file.toStringz(), user, group);

		if (result != 0)
		{
			switch(errno)
			{
				case EPERM:
					break;

				default:
					break;
			}
		}
	}
}

创建硬链接和符号链接


import core.stdc.errno;
import core.sys.posix.unistd;
import std.string;

void main(string[] args)
{
	auto file   = "test.txt";
	auto linked = "link.txt";
	auto result = link(file.toStringz(), linked.toStringz());

	if (result != 0)
	{
		switch(errno)
		{
			case EPERM:
			case EACCES:
				break;

			case EEXIST:
				break;

			case ENOENT:

			default:
				break;
		}
	}
}

创建符号链接

auto result = link(file.toStringz(), linked.toStringz());
字符串
auto result = symlink(file.toStringz(), linked.toStringz());
posted @ 2022-02-20 17:58  zjh6  阅读(20)  评论(0)    收藏  举报  来源