File I/O (serialization) with character shift

ciphermagi (807)
My issue is that with my serialization set up the way it is, my fields are bleeding together so that when I read it in from the file into the class, I'm getting multiple fields in one of my class variables.

I can't seem to figure out what I'm doing wrong. Any suggestions?

Output to file:

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void key_pair::WriteClass(std::ofstream& file)
{
	std::string * str[4] = {&pass, &old_pass, &name, &exclude};
	unsigned len;
	char convert;
	int shift = rand() % 128;
	std::stringstream tmp;
	
	file.write(reinterpret_cast<const char *>(&shift), sizeof(shift));
	
	for(int i = 0; i < 4; ++i){
		for(std::string::iterator j = (*str[i]).begin(); j != (*str[i]).end(); ++j){
			convert = *j;
			convert += shift;
			tmp << convert;
		}
		len = tmp.str().size();
		file.write(reinterpret_cast<const char*>(&len), sizeof(len));
		file.write(tmp.str().c_str(), len);
		
		tmp.clear();
		tmp.str(std::string());
	}
	
	file.write(reinterpret_cast<const char*>(&pass_min), sizeof(pass_min));
	
	file.write(reinterpret_cast<const char*>(&pass_max), sizeof(pass_max));
	
	file.write(reinterpret_cast<const char*>(&flags), sizeof(flags));
}


Input from file:
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key_pair::key_pair(std::ifstream& file)
{
	unsigned len;
	int shift;
	char convert;
	std::string tmp;
	std::stringstream converted;
	std::string * str[4] = {&pass, &old_pass, &name, &exclude};
	
	file.read(reinterpret_cast<char *>(&shift), sizeof(shift));
	
	for(int i = 0; i < 4; ++i){
		file.read(reinterpret_cast<char*>(&len), sizeof(len));
		if(len > 0){
			char* buf = new char[len];
			file.read(buf, len);
			tmp.append(buf, len);
			delete[] buf;
		}
		for(std::string::iterator j = tmp.begin(); j != tmp.end(); ++j){
			convert = *j;
			convert -= shift;
			converted << convert;
		}
		(*str[i]) = converted.str();
		converted.clear();
		converted.str(std::string());
	}
	
	file.read(reinterpret_cast<char *>(&pass_min), sizeof(pass_min));
	
	file.read(reinterpret_cast<char *>(&pass_max), sizeof(pass_max));
	
	file.read(reinterpret_cast<char *>(&flags), sizeof(flags));
}
cire (8284)
See line 17 in the input code snippet. Do you really want to append?
ciphermagi (807)
*sigh* No. I want to replace. >.<
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