tpassward.h

这是一个在windows平台下运行的类似于win98的屏幕保护程序“变幻线”的东东

#ifndef TPASSWARDH
#define TPASSWARDH

class TPassward  //定义能任意长度的字符串对象
{
private:
	char* string; //字符串首地址
	int len;      //字符串长度

public:
	//缺省构造函数
	TPassward()
	{
		len = 0;
		string = new char[len+1];
		strcpy(string,"");
	}
	
	//重载构造函数
	TPassward(int _len)
	{
		len = _len;
		string = new char[len+1];
	}

	//拷贝构造函数
	TPassward(TPassward &S)
	{
		len = S.len;
		string = new char [len+1];
		strcpy(string,S.string);
	}

	//得到字符串首地址
	char* GetString()
	{
		return string;
	}

	//两个对象相等
	TPassward operator=(TPassward& S)
	{
		len = S.len;
		delete string;
		string = new char[len+1];
		strcpy(string,S.string);
		return *this;
	}

	//加上一个字符
	TPassward operator+(char c)
	{
		TPassward temp(len+1);
		strcpy(temp.string,string);
		temp.string[len]=c;
		temp.string[len+1]='\0';
		*this = temp;
		return *this;
	}

	//是否和一个字符串相等
	int operator==(const char *const s)
	{
		int slen = strlen(s);
		if (len != slen)
			return false; 
		for (int i=0;i<len;i++)
			if (string[i] != s[i])
				return false;

		return true;
	}

	//清空字符串
	void clear()
	{
		len = 0;
		delete string;
		string = new char[len+1];
		strcpy(string,"");
	}

	//析构函数
	~TPassward()
	{
		len = 0;
		delete string;
	}

};

#endif