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"); try {HttpResponse HttpResponse = Httpclient.execute (HttpRequest); if (Httpresponse.getstatusline (). Getstatuscode () = = HTTPSTATUS.SC_OK) {//Get the returned string result = Entityutils.tostring (httpresponse.getentity ()); Tv.settext(result);//Assume that the error message msg = new Message () is used here; Msg.what = 0x123; Handler.sendmessage (msg);

-level pointer, to distinguish the input and output characteristics of the pointer//input characteristics of pointers: allocating memory in the main function, using in the called function//output characteristics of pointers: allocating memory within the called function, mainly by throwing out the results of the operationintGetLen3 (int*p/* in Out*/){ //* (NULL) = 40; //* (0) = +;*p = +;//Indirect Assignment If p is the address of a, then indirectly modifies the value of a//*p parameter, to in

Examples of C-language and error-prone FunctionsStrncmp Used to compare whether two strings are equal. Int strncmp (const char * str1, const char * str2, size_t n ); Defense point: the length of n must be sizeof (str1) or strlen (str1) + 1. Make sure that "\ 0" is also compared, otherwise, "AB" and "abc" are also judged to be equal when n = 2. #include #include int main(){ char arg[10]; scanf("%s", arg); if(!strncmp("jack", arg, s

[Note] the priority of the C Operator is prone to errors.C Operator priority! The names or meanings of priority operators are used in combination with directions. 1 [] array subscript array Names [constant expressions] Left to right () parentheses (expressions)/function names (parameter tables ). member selection (object) object. member name-> member selection (pointer) object pointer-> member name 2-negative sign operator-expression right to left sin

Some error-prone knowledge about routers and vswitches 1. When a vswitch receives a frame with no errors from a port and forwards the frame to the destination address, the switch automatically discards this frame. (Detailed Description: If a frame without error is received from port x (discarded if any error occurs), search for the target station MAC address in the forwarding table. If Port d = x is sent to the MAC address, the frame is discarded (bec

. [] no less.#include (ii) Mixing string and C-style stringsString can be initialized with a C-style string, but the character pointer cannot be initialized with a string object and can be converted using C_STR. string s = "FDSAFD";//char *p = s; Errorconst char *p = S.C_STR (); OK, return const/Note that if the s changes after that, then * (P+n) takes the changed valueThe original return array is invalid, if you want to use the original array, it is best to copy and save(c) Finally, a little b

C-language pointer error-prone 1. Memory leakage: the requested heap memory is not released. 2. Memory pollution. The following code: If the struct contains only some underlined code, no error will be reported when it is written in the compiler, but the memory operation has already been illegal. The following will add some variables to the struct, and an error will be reported, do not allow variable definition (this error is especially difficult

Summarized some common pointer error-prone issues (4) and pointer Common Problems Pointer and struct Introduction: We can use the structure of C to represent data structure elements, such as linked lists or Tree nodes. Pointers are links that link these elements together. Typedef struct _ person {char * firstName; char * lastName; char * title; unsigned int age;} Person;/* Initialize with dot notation */ Person person;Person. firstName = (char *) mall

1. Output all numbers from 1: 650) This. width = 650; "src =" http://s2.51cto.com/wyfs02/M02/80/63/wKiom1c_HdXyfd0yAAA__PIYJUU397.jpg "Title =" 7.jpg" alt = "wkiom1c_hdxyfd0yaaa1_piyjuu397.jpg"/> 2. Number of outputs between 1 and: 650) This. width = 650; "src =" http://s5.51cto.com/wyfs02/M02/80/63/wKiom1c_HyyQvSmyAABY-nqWETQ566.jpg "Title =" 08.jpg" alt = "wKiom1c_HyyQvSmyAABY-nqWETQ566.jpg"/> The output results of the two statements are consistent, but the conditions are different. When "

First, BlockThe object's properties or methods are referenced inside the block, causing the block to retain the object, while the object retains the block to form a circular reference.The solution is to use __weak in the arc to weaken the object and use __block in non-arc to weaken the object. As follows:@property (nonatomic, ReadWrite, copy) Completionblock Completionblock; // ======================================== typeof (self) weakself == ^ { if (weakself.success) { weakself.succ

rpt_crm_cube_kpi_lose_gb_seq where dt = ‘$DATE‘ and type=‘ALL‘ group by report_date, area_name, manager_name, manager_user_id, tree_code ) peer inner join ( select * from rpt_crm_cube_kpi_gb_tree_code where dt = ‘$DATE‘ and kpi = ‘all_lose‘ ) parent on peer.tree_code = parent.tree_code;EOF} Errors: The data type of a column must be clear; otherwise, an error occurs during conversion fr

Research: men with low IQ are prone to derailment DeceitfulAndDespicableIs one description that wronged wives cocould apply to their cheating husbands. Fraud and mean are the words used by the victim's wife to describe the derailed husband. Plain stupid is another. For scientists have concluded that men who sleep around are likely to have lower IQs. An idiot is another word used to scold an derailed man. Recently, researchers have concluded that men w

The first one:When the push out of a collectionview will crash, because there is no layout or what can not understand English, solutionRewrite the Init method in the interface you need to push out-(ID) init{Uicollectionviewflowlayout *layout = [[Uicollectionviewflowlayout alloc]init];if (self =[super initwithwithcollectionviewlayout:layout]) {}return self;}The second one:Random numbers appear when you use storyboard and code federation to pass values to another collectionview in order to fix thi

("%s\n", errormessage); } Passing strings　　#include #include#include"string.h"size_t Stringlength (Char*string) {size_t length=0; while(*(string++) ) {length++; } returnlength;} intMain () {Char* error="ERROR:"; Char* errormessage="Not enough memory"; Char* Buffer= (Char*)malloc(strlen (Error) +strlen (errormessage) +1); strcpy (Buffer,error); strcat (buffer, errormessage); printf ("%s\n", buffer); printf ("%s\n", error); printf ("%s\n", errormessage); printf ("%d\n", buffer); printf

) print (a)[1, 2, 3, 7]　　The extend is followed by an iterative object that represents a bulk addition, which loops the object followed and adds one to it.A=[1,2,3,4]a.extend ([5,6,7,8]) print (a) [1, 2, 3, 4, 5, 6, 7, 8]updata Update, equivalent to extend in the listA ={1: "1", 2: "2", 3: "3"}b={7: "7"}a.update (b) print (a) {1: ' 1 ', 2: ' 2 ', 3: ' 3 ', 7: ' 7 '}__add__ () Add parentheses inside must be GansoA = (1,2,3,4) b = a.__add__ ((5,6,7)) print (b) (1, 2, 3, 4, 5, 6, 7)================

official recommended notation)There are a bit more points to be aware of here, each analysis.After omitting the attribute implementation part of the code, Xcode gives the default property implementation code like this@synthesize Property 1 = _ Property 1, Property 2 = _ Property 2;The _+ property name is the instance variable of the attribute operation, as the example of the above attribute declaration code, the code generated by Xcode is like this@synthesize item = _ITEM,AAA = _AAA;Note that o

It should be noted that the table name and field name are wrapped using the operator ("~" on the top left corner of the keyboard). The value behind values is enclosed in single quotes, which is said to be an anti-injection measure. Copy the Code code as follows: $sql = "INSERT into ' table name ' (' Field 1 ', ' field 2 ') VALUES (' Value 1 ', ' Value 2 ')";mysql_query ($sql); The above describes the ASP. PHP database connection error-prone specia

CRC32, which is prone to conflicts. the birthday paradox is not a test code. it is easy to calculate a pair of PHPcodedefine ('R', 1e5); $ _ CRC32 = array (); for ($ I = 0; ++ $ I) {$ tmp = sprintf ('% X', crc32 ($ I) CRC32, which is easy to conflict The birthday paradox is not a lie With the test code, it is easy to calculate a pair PHP code Define ('R', 1e5); $ _ CRC32 = array (); for ($ I = 0; ++ $ I) {$ tmp = sprintf ('% X', crc32 (

Several error-prone css box model details-jerrylsxu css is one of the skills required by the front-end. Box Model ,: Generally, it is border, margin, padding, and content. The concept is quite understandable. However, when the box model is used with other attributes, it may be difficult for you to answer the question. Let's take a look at the details of the css box model that is easy to make mistakes. Question 1: When nesting block-level elements, w

The topics are as follows:functionFoo () {getName=function() {alert (1); }; return This;} Foo.getname=function() {alert (2);}; Foo.prototype.getName=function() {alert (3);};varGetName =function() {alert (4);};functionGetName () {alert (5);}Please write out the following output results:foo.getname (); GetName (); Foo (). GetName (); GetName (); New foo.getname (); New Foo (). GetName (); New New Foo (). GetName ();Topics from MU-Class networkA very error-