what 0xff

Analysis of SIMLock and simlock Functions I. background The lock card is SIMLock. When the mobile phone is started or SIM card is inserted, the configuration information preset in NV on the modem side of the mobile phone will be compared with the

Disclaimer: This document is provided by colleagues of the company.   Configure in custom_nvram_sec.c   Example ):  Nvram_ef_sml_default [0] represents Card 1 configuration, nvram_ef_sml_default [1] represents Card 2 configure const

Fundamentals of 1 system 12,864 point formation liquid crystal display12,864-point array graphic liquid crystal display application, one through C51 programming realizes to the LCD12864 LCD screen control, the liquid crystal display (LCD) has the

Sender: gdtyy (gdtyy), email area: embeddedTitle: VxWorks for lpc2210 Network Application Programming PracticeMailing station: shuimu community (Mon Jun 25 23:26:20 2007), within the station **************************************** VxWorks for lpc221

Need to do a function, video and playback are displayed when the recording time, reference article links can not find, sorry, here to record, to prevent the next time you cannot find. Another article about the source code recording process, please

Overall Features:1. The mobile app connects to the test device via Bluetooth.2. Sends a 48-byte hexadecimal number via Bluetooth.3. Receive 48-byte hexadecimal numbers via Bluetooth.4. Parses a 48-byte hexadecimal number to generate a text file.5.

Another analysis is as follows:Why is byte related to 0xFF?Look at the following code before you dissect the problem Public Static String bytes2hexstring (byte[] b) { = ""; for (int i = 0; i ) { = integer.tohexstring (b[i] & 0xFF); if

Look at the following code before you dissect the problempublic static String bytes2hexstring (byte[] b) {String ret = "";for (int i = 0; i String hex = integer.tohexstring (b[i] & 0xFF);if (hex.length () = = 1) {Hex = ' 0 ' + hex;}RET + =

Look at the following code before you dissect the problemJava code Public static String bytes2hexstring (byte[] b) { String ret = ""; For (int i = 0; i String hex = integer.tohexstring (b[i] & 0xFF); if (hex.length () = = 1) {

Byte[] B = {1,2,20,108};String stmp = java.lang.Integer.toHexString (B[n] & 0XFF)In the 32-bit computer, the numbers are stored in 32 format, if it is a byte (8-bit) type of number, his high 24-bit inside are random numbers, low 8-bitis the actual

TS Packet header parsing Allocation of table identifier value (TABLE_ID) Value Description 0X00 Program Association segment (PAT) 0x01 conditional receive segment (CAT) 0X02 Program Map segment (PMT) 0X03 Transport Stream Description

Inadvertently looking over the code, found a difficult to understand the code. byte [] bs = digest.digest (origin.getbytes (Charset.forname (CharsetName))); for (int i = 0; i ) { int c = bs[i] & 0xFF;

# Include # Include Int main (){Char;Memset (& A, 0xff, 1 );If (A = 0xff)Printf ("Equal. \ n ");ElsePrintf ("not equal. \ n ");Return 0;} The answer is not equal. It can be seen from GDB that the variable in the memory is indeed 0xff, because it

When doing serial port communication, the data is sent in byte type.The normal byte range is-128-127, while Java's byte range is 0-255So when the byte of the data is converted to Java byte, it needs to do a & operation with 0xFF (11111111),

In Java, why does byte convert int with 0xff and perform operations? See the following code before profiling the problem:Public static string bytes2hexstring (byte [] B ){String ret = "";For (INT I = 0; I String hex = integer. tohexstring (B [I] &

Look at the following code before you dissect the problempublic static String bytes2hexstring (byte[] b) {String ret = "";for (int i = 0; i String hex = integer.tohexstring (B[i] & 0xFF);if (hex.length () = = 1) {Hex = ' 0 ' + hex;}RET + =

Byte [] B = {1, 2, 20,108 }; String stmp = java. Lang. Integer. tohexstring (B [N] & 0xff)   In 32-bit computers, numbers are stored in 32 format. If a byte (8-bit) number is used, its 24-bit height is a random number, which is 8-bit lower. Is

Qt:   Static char fobitsarray [53] [8] ={{0xff, 0xff, 0xff, 0xff, 0x0, 0xff, 0xff, 0xff}, // 01{0xef, 0xef, 0xef, 0xef, 0xef, 0xef, 0xef, 0xef },{0x7f, 0xbf, 0xdf, 0xef, 0xf7, 0xfb, 0xfd, 0xfe },{0xfe, 0xfd, 0xfb, 0xf7, 0xef, 0xdf, 0xbf, 0x7f },{0xf7

  Based on the definition and structure of each data in the previous article, the data is parsed as follows: TS header definition: Typedef struct ts_packet_header{Unsigned sync_byte: 8; // Synchronization Byte, fixed to 0x47, indicating a TS

Charstrong go to intWhy use 0xFF? Note: in Javaexpressed in complementary form BinaryIf you do not want a symbol extension, you can take the action. For example char c;int i = C & 0xFFFF, where Char has 8 bits, the int type has 32 bits, and with 32/8