c++读取json数据

最好用string这个类

// 从文件中读取字符串
string readfile (const char* filename)
{
	FILE* fp = fopen(filename, "rb");
	if(!fp)
	{
		printf("failed to open file! file: %s" , filename);
		return "";
	}
	char* buf = new char[1024*16];
	int n = fread(buf, 1, 1024*16, fp);
	fclose(fp);

	string result;
	if(n >= 0)
		result.append(buf, 0, n);
	delete [] buf;

	return result;
}