memcpy

(connect (rc, (struct sockaddr *) sin, sizeof (sin ))! = 0){Printf ("connect fail! \ N ");Exit (0 );} Memset ( cLientPkg, 0, sizeof (cLientPkg ));Memcpy (cLientPkg. pPID, "0000", 4 );CLientPkg. cCommand = 0x66;Memcpy (cLientPkg. pAreaID, "0000", 4 );Memcpy (cLientPkg. Fig, "0000", 4 );Memcpy (cLientPkg. pOperater, "0

");Printf ("-TP: int to (recipient) open UDP port number:/N ");Printf ("137,138,445,500 (default)/n ");Printf ("-Ti: IP to (recipient) IP Address/N ");Printf ("-N: int number of times/N ");Exit (1 );} VoidValidateargs (INT argc, char ** argv){Int I; Itoport = 500;Ifromport = default_port;Dwtoip = inet_addr (default_ip );Dwfromip = inet_addr (default_ip );Dwcount = default_count;Memcpy (strmessage, dnsreply, sizeof (dnsreply)-1 ); For (I = 1; I If (ar

] = // omitted, written by isno, used to decode shellcodeIf (wsastartup (makeword (2, 0), wsadata )! = 0){Printf (/"wsastartup error. Error: % d // n/", wsagetlasterror ());Return false;} If (sock = socket (af_inet, sock_dgram, ipproto_udp) = invalid_socket){Printf (/"socket failed. Error: % d // n/", wsagetlasterror ());Return false;} Sendlen = widechartomultibyte (0x3a8, wc_compositecheck, shellcodehead,-1, sendbuf, 0x1000, null, null); // converts the decoded code to the other's multibytetow

, that is, the void pointer can be assigned a value for any type of data, so the void pointer can also be used as a function parameter, in this way, the function can accept any data type pointer as a parameter. For example:Void * memcpy (void * DEST, const void * SRC, size_t Len );Void * memset (void * buffer, int C, size_t num ); Many beginners do not understand the void and void pointer types in C/C ++, so some errors have occurred in usage. This a

: int func (void). Because a void pointer can point to any type of data, that is, you can assign a null pointer to a pointer of any data type, you may also use a void pointer as a function parameter, so that the function can accept pointers of any data type as arguments. For example:void * memcpy (void *dest, const void *SRC, size_t len);void * memset (void * buffer, int c, size_t num); Many beginners do not understand the type of void and void poin

m_rrecordset; Vector m_vecfields; Char m_arrrowbuff[65536// uint32 // location already in use Related class Section Code 2: Switch(nType) { Casefield_type_tiny: {mi64val= Pszvalue? Atol (pszvalue):0; memcpy (m_arrrowbuff[m_nbuffbegin], mi64val,1); M_nbuffbegin+=1; } Break; Casefield_type_short: {mi64val= Pszvalue? Atol (pszvalue):0; memcpy (m_arrrowbu

functions memcpy and memset, are:void * memcpy (void *dest, const void *SRC, size_t len);void * memset (void * buffer, int c, size_t num);in this way, any type of pointer can be passed into memcpy and memset, which also truly reflectsThe meaning of the memory manipulation function because the object it operates is simply a piece of memory, regardless of whether

not so determined, it specifies void * 's algorithm operation and char * consistent. The following statements are therefore correct in the GNU compiler: Pvoid++;//gnu: RightPVOID + 1; GNU: Right The result of the pvoid++ was that it increased by 1. In the actual program design, in order to meet the ANSI standard and improve the portability of the program, we can write code to achieve the same function: void *pvoid;(char *) pvoid++; ANSI: correct; GNU: Correct(char *) pvoid + + 1; ANSI: Error;

(1) Write a function to copy the memory Void * memcpy (void * DST, const void * SRC, unsigned int Len){Register char * D;Register char * s;If (LEN = 0)Return DST;If (DST> SRC) // consider Overwriting{D = (char *) DST + len-1;S = (char *) SRC + len-1;While (LEN> = 4) // expand the loop to improve execution efficiency{* D -- = * s --;* D -- = * s --;* D -- = * s --;* D -- = * s --;Len-= 4;}While (Len --){* D -- = * s --;}}Else if (DST {D = (char *) DST;

: Pvoid ++; // GNU: CorrectPvoid + = 1; // GNU: Correct The execution result of pvoid ++ is increased by 1.In actual programming, to cater to ANSI standards and improve program portability, we can write code that implements the same function as below: Void * pvoid;(Char *) pvoid ++; // ANSI: Correct; GNU: Correct(Char *) pvoid + = 1; // ANSI: error; GNU: Correct Rule 4 if the function parameter can be a pointer of any type, the parameter should be declared as void *Typical function prototypes fo

: CorrectThere are some differences between GNU and ANSI. In general, GNU is more open than ANSI and provides support for more syntaxes. However, we should try our best to cater to the actual design.ANSI standard.Rule 4 if the function parameter can be a pointer of any type, the parameter should be declared as void *Typical function prototypes for memory operation functions such as memcpy and memset are:Void * mem