C++ 文件 *** 作回顾

#inclass="superseo">clude 
#include 
using namespace std;

//ASCII读写
void assciiReadWirteFile(const char* readFileName, const char* writeFileName)
{

	fstream read(readFileName, ios::in);
	fstream write(writeFileName, ios::out);
	//流运算符读写, eof()函数返回当前文件是否在文件末尾

	//这么写不能读空格
	while (!read.eof()) 
	{    
		char key;
		read >> key;
		write << key;
	}

	//使用get 和 put 可以读空格
	//while (!read.eof()) {
	//	char key;
	//	read.get(key);
	//	write.put(key);
	//}

	read.close();
	write.close();
}

//二进制读写
void binaryReadWrite(const char* readFileName, const char* writeFileName) 
{

	//写了两个对象分别是 读 和 写 ,先写框架,关闭这两个文件
	fstream readObject(readFileName, ios::in | ios::binary);
	fstream writeObject(writeFileName, ios::out | ios::binary);

	//判定写入的文件是否为空
	while (!readObject.eof()) 
	{

		//先写足够的空间 , 1024字节
		char str[1024] = "";

		//写入文件
		readObject.read(str, 1024);

		//读文件
		writeObject.write(str, 1024);
	}

	//关闭文件
	readObject.close();
	writeObject.close();
}

//文件指针偏移
void SeekFile(const char* FileName)
{
	fstream fread(FileName, ios::in);
	if(!fread) 
	{
		cerr << "open fread lose" << endl;
	}
	fread.seekg(3);
	char key = fread.get();
	cout << key << endl;
	
	fread.seekg(0, ios::beg);
	cout << fread.get() << endl;
    //默认是打印4
    //(char)fread.get();
}

int main() {

	cerr << "程序异常终止" << endl;

	//打开文件测试
	fstream file("xxpp.txt", ios::in | ios::out | ios::trunc);
	if (!file || !file.is_open())
	{
		cerr << "文件打开失败" << endl;
	}
	
	//关闭测试文件
	file.close();

	//ASCII 读写操作
	assciiReadWirteFile("a.txt", "b.txt");

	//二进制读写操作
	binaryReadWrite("binaryA.txt", "binaryB.txt");

	//文件指针偏移
	SeekFile("Seek.txt");

	cerr << "程序异常终止" << endl;

	return 0;
}