The comparison function of IP (v4) ranges is often used in projects. Generally, IP addresses are converted to Integers before comparison.I. Basic knowledge points
IP --> INTEGER:
Convert IP addresses to byte ArraysConvert to int through the left
In Java, Byte uses a binary representation of 8 bits, and we know that each character of the 16 binary needs to be represented by a 4-bit bits (23 + 22 + 21 + 20 = 15), so we can convert each byte to two corresponding 16 characters, That is, the
Java's API source code contains some processing methods for bytes. The following code is used to copy or paste the modified Code.
// Convert byte [] to int. Off indicates the start position of byte. Static int getint (byte [] B, int off) {return (B [
> Http://blog.chinaunix.net/u2/67414/showart_1657718.html
To see the actual running effect, we select the 8139too Nic as an example to crop the relevant code from the Linux driver of the NIC.The driver of a PCI device must describe itself to the
My app recently needed a recording function, so I searched this articleThe communication between the recording thread and the main thread in the article is achieved by accessing the external class member variable through the inner class.while
MediaRecord can be used for recording in Android, which is easy to operate. However, it is not professional enough to Process audio. If you want to process audio in real time or encapsulate the audio
You can use AudioRecord for recording.
Here
I am reading the code for writing yaffs2 in uboot. I have some questions.Enter the command, run do_nand, and then run nand_write_opts
Int nand_write_opts (nand_info_t * meminfo, const nand_write_options_t * opts){..........................
Here's a simple way to record the two conversions:The first type:1, int and byte[] conversion (similar to the byte Short,long type)[Java]View PlainCopy
/**
* Converts an int value to a byte array of four bytes, this method applies to the order
This post goes from: H T t p://blog.csdn.net/sunnyfans/article/details/82869061, int and byte[] conversion (similar to the byte Short,long type)1 /** 2 * Converts an int value to a byte array of four bytes, this method applies to the order of (low
Java_io System Randomaccessfile Introduction, into the source code and example--20RandomAccessFile1, class features Introduction:File random access stream, care several features:1, he realized the interface is no longer inputstream, outputstream any
Body of the functionUnsignedCharGetKey () {unsignedChari,j,k; StaticUnsignedCharbackup[4][4]={ {1,1,1,1},{1,1,1,1},{1,1,1,1},{1,1,1,1} }; EA=1; Tmod=0x01;//set T0 to mode 1th0=0xF8; TL0=0xCD; ET0=1;//Enable T0 interrupttr0=1;//Start T0
Animations in Android are divided into view animations (views Animation), Attribute animations (property Animation), and drawable animations. Starting with the Android 3.0 (API level 11), Android is starting to support property animations, and this
Main content1. Decimal Binary Mutual Transfer2. Binary bit operations3.JDK built-in conversionThe binary in 4.JAVAdecimal binary Mutual transfer57 111001Binary bit operations:Advantages: In specific cases, the calculation is convenient and is widely
Reprinted please indicate the source: blog. csdn. netguoyjoearticledetails184425371. Find the system process number corresponding to the current session: SPID7376. the following statement (executed in the first window) gyj @ OCMselectspidfromv $
Dataconverterle.java01/**
02 * Data Format conversion (byte => short int long float double)
* Little Endian storage mode
* PACKAGE:cma.common.dataio
Description:little Endian data Format conversion
* MODIFIER: Liu Zejun
* email:bj0773@gmail.com
*
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