how to properly use string level

1.rs232 levelOr the serial level, some even say the computer level, all these statements, refers to the computer 9-pin serial port (RS232) level, using negative logic,-15v ~ -3V Rep 1+3V ~ +15v Rep 02.rs485 and RS422 levelSince both use differential

[-] Use the service in moderation Free memory when the interface is not visible Freeing memory when memory is tight Avoid wasting memory on bitmap Using the optimized data collection Know the cost of memory Use

A lot of friends have asked me how to write high-performance applications, how to avoid the application of oom, or when the program memory consumption is too high, how to troubleshoot. Indeed, a good application, not only to perform well,

Recently in learning Python, just the boss recently let me do a POST request Test Web Service is normal to enable the small monitoring, the Internet to check the next information, found that the powerful Python can be used, so they are now learning

Http://blog.csdn.net/ruifangcui7758/archive/2010/10/18/5948611.aspxIntroductionIf you encounter a common error in your development process, perhaps your release version does not work and the debug version runs correctly, I recommend that you read

Java does not provide any security mechanisms to terminate threads, although methods such as Thread.stop and suspend provide such mechanisms, but there are serious flaws that should be avoided using these methods.It provides interrupts (interrupt),

Procedure 1:Void mymalloc (char * s) // I want to allocate memory in the function and then return{S = (char *) malloc (100 );}Void main (){Char * P = NULL;Mymalloc (p); // here, P is actually null, and the value of P is not changed. Why?If (p) Free (

For a product or project, a detailed log is usually printed during testing. After the product is released, the highest level of log4j is usually set to Improve the efficiency, once a problem occurs to the customer, it is important to check the

By its very nature, a regular expression (or RE) is a small, highly specialized programming language that is embedded in Python and implemented through the RE module. With this small language, you can specify rules for the set of strings that you

Window I. Introduction Cats and babies have a lot in common. They all like to eat the plant in the family, all very hate to close the door. And they all love to play with your keyboard, as a result, the email you are sending to your boss may have