Blockchain Technology Signify the Beginning of Internet of Value Era
Created by a mysterious hacker named Satoshi Nakamoto, distributed register technology, which is the basis of the crypto currency, Bitcoin, also known as a blockchain, can drastically change many industries, from finance and real estate to the entertainment industry. This forces the Silicon Valley titans, world financial leaders and even independent developers to hastily calculate the consequences of the appearance of this technology, so as not to be caught unaware.
Tim Swanson, the head of R3's development department (a New York start-up, organized with the support of a consortium of large banks), called the blockchain something like glutene: everybody talks about it, but no one really knows all the details. Quite simply, the blockchain is used to transfer something that has value: money, shares, property rights, digital license fees, even the votes of voters in the elections through the Internet from one party to another...
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Today, such transactions often pass through many intermediate parties in the process of authorization, clearing and processing, and are stored in centralized registries of organizations such as the Central Bank (if it comes to financial transactions) or the system of electronic registration of mortgage transactions.
Blockchain distributes the functions of validation and storing the transactions between several computers in a safe and open way, eliminating the need for intermediaries. As a result, the time and costs of processing transactions are practically reduced to zero. Alex Tapscott, CEO of Northwest Passage Ventures (specializing in block chains), sees this technology as the next generation of the Internet, which he calls the Internet of Value.
Since both the original technology of block chains for bitcoins and its new variations, according to Tepskott, have the most powerful potential for transforming huge branches of the economy, the first attempts to develop solutions based on blockchain were made in two areas: in financial services and in creativity, namely music and advertising.
Displaying Open File Dialog using WinApi
This article answers the question How to display Open File Dialog in the C++ program? Further, we will show the sample code that displays an Open dialog box so that a user can choose the directory and a file name of a to open. The whole program is built on Windows API and can run on Windows 10, Windows 8, Windows 7, and even Windows XP.
The GetOpenFileName function returns TRUE if the user clicks the OK button and the specified path and file name exist. In this case, the buffer pointed to by the lpstrFile member contains the path and file name. The sample code uses this information in a call to the function to open the file.
In this example, the lpstrFilter member is a pointer to a buffer that specifies two file name filters that the user can select to limit the file names that are displayed. The buffer contains a double-null terminated array of strings in which each pair of strings specifies a filter. The nFilterIndex member specifies that the first pattern is used when the dialog box is created.
What blockchain is?
Block (a chain of blocks) is a distributed database, in which storage devices are not connected to a shared server. This database stores an ever-growing list of ordered records, called blocks. Each block contains a timestamp and a link to the previous block. The use of encryption ensures that users can only change parts of the chain of blocks that they "own" in the sense that they have private keys, without which writing to the file is impossible. In addition, encryption provides synchronization of copies of the distributed chain of blocks for all users.
Security in blockchain technology is provided through a decentralized server that places timestamps and peer-to-peer network connections. As a result, a decentralized database is formed, which is managed autonomously, without a single center. This makes the blockchain very convenient for registering events (for example, making medical records) and data operations, identity management and authentication of the source.