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C + + knowledge and skills used in QT-what you have to understand This section will help you if you are unsure of the adequacy of your knowledge of C + + in using QT programming. This gives QT itself and C + + knowledge involved in programming with QT, so by reading this section you will see if you are missing some C + + skills. If you want to learn more about the C + + features mentioned here, we recommend that you look at the c++:the Core Language,

returns the number of seconds, Failure returns ((time_t)-1) value, and the reason for the error is in errno. Code Description: #include #include #include #include int main (int argc, char** argv) { int seconds = time (NULL); printf ("%d\n", seconds); return 0; } Execution results: [Root@vm_174_171_centos unixtime]# g++-g-o unixtime_time unixtime_time.cpp [Root@vm_174_171_centos unixtime]#./unixtime_time 1445008165 gmtime (get current time and date) Function Description:

are run within a process41.tar commandThe TAR command has 4 functions, such as packaging, unpacking, compressing and decompressing, and there are two types of compression and decompression methods that are used frequently: gzip and bzip2. Files that end with ". Gz", ". Z" are compressed by gzip, and files ending with ". bz2" are compressed in bzip2 manner, with the word "tar" in the suffix, which indicates that this is a compressed file package.The T

Organize Linux to view some of the frequently used commands for system logs Last-a the host name or IP address from which to log in to the system, displayed on the last line.-d Specifies the record file. Specifies the record file. Converts an IP address into a host name.-F -N -R does not display the host name or IP address of the login system.-X displays information such as system shutdown, another boot, and changes in operational levelsHere

←divide-and-conquer (pi) recursive solution pi6. T←merge (y1,y2,..., yk) merging sub-issues7. Return (T)Among them | P| indicates the size of the problem p, N0 is a threshold value, indicating that when the size of the problem p does not exceed n0, the problem is easily solved and no further decomposition is necessary. Adhoc (P) is the basic sub-algorithm in the division method, which is used to solve the problem P of small scale directly. Therefore,

word2010 to make it easier for users to find the last document they opened, there is a feature that records the documents you have recently used. This feature is really convenient for our day-to-day office work, but the pros have disadvantages, so that we can disclose the privacy of our documents, but how to delete or hide our recently used documents? How do you delete the most recently

NmapNmap + IP Address scan host open portNmap-p 1-x + IP address scans specific host portsNmap-v-A-SV +IP address detailed scan hostNmap-p Port +IP address 192.168.1.* specific IP in clusterNmap-o System TestingNMAP-SV ports running on the +IP serviceZnmap graphicalPOF fingerprintTool can scan the capture fileRecon-ng reconnaissance using reconnaissance/HOST/enumeration/HTTP/network/xssed)Target domainUse many modulesNetdiscover can check all the hosts on the LANis a set of Nmap, Nikto, Hydra an

writing and usageThe first thing to understand is that in JS everything is an object, and a function is a kind of object. Let's take a look at the 5 types of closures, and simply understand what closures are. It will be explained in detail later.The 1th notation function Circle (r) { THIS.R = r;} Circle.pi = 3.14159functionThisnew Circle (1.0 There is nothing special about this notation, just adding some attributes to the function.The 2nd notation function() { new Object ()

Came to the weekend, little bastard finally have the energy and time to update the next blog. A short time ago, Bastard read a code, a variety of data structure of the flexible use of praise, but also greatly stimulated the small bastard on a variety of data structure to comb and summarize the desire. Just recently also read a number of great God's articles, feel summed up the commonly used data structure for their own can also be flexible use becomes

The. NET platform is great. It's really great. Until it's no longer so great. Why am I no longer using. NET? In short, it limits our ability to choose (which is important to me), diverting our attention and making us aware of its security, instead of all the possibilities that help us to perceive the wider world outside.　　[Fasten your seatbelt: the length of this article is almost a book ...]AdvantagesFirst, let me start by saying that. NET is doing the right thing, although most of it doesn't c

Overview of Threads:A thread is a program's multiple execution path, the unit that executes the dispatch, relying on the process existence. The thread can not only share the memory of the process, but also have a memory space of its own, which is called the line stacks, which is allocated by the system when the thread is established, and is mainly used to hold the data inside the thread, such as the variables defined in the thread execution function.J