memcpy

MemcpyPrototype: extern void * memcpy (void * DEST, void * SRC, unsigned int count );Usage: # include Function: copy count bytes from the memory area indicated by Src to the memory area indicated by DeST.Note: the memory areas specified by Src and DEST cannot overlap. The function returns a pointer to DeST. You can copy any data type object. For example, char a [100], B [50]; memcpy (B, A, sizeof (B); If si

Static _ always_inline void * _ memcpy (void * To, const void * From, size_t N) {int D0, D1, D2; ASM volatile ("rep; movsl \ n \ t "" movl % 4, % ECx \ n \ t "" andl $3, % ECx \ n \ t "" JZ 1f \ n \ t "" rep; movsb \ n \ t "" 1: ":" = C "(D0 ), "= D" (D1), "= S" (D2): "0" (N/4), "G" (N ), "1" (long) to), "2" (long) from): "Memory"); return to;}/** this looks uugly, but the compiler can optimize it totally, * as the Count is const Ant. */static _ al

# Include "memory. H" Memset is used to set all memory spaces to a specific character. It is generally used to initialize the defined string to ''or '/0'. For example, char a [100]. memset (A, '/0', sizeof ()); Memcpy is used for memory copying. You can use it to copy any data type object and specify the length of the copied data. For example, char a [100], B [50]; memcpy (B, a, sizeof (B); note that if siz

Copy Code code as follows: #include #include #include #include memcpy: Copying by byte Prototype: extern void* memcpy (void *dest,void *src,unsigned int count) Function: Copy count bytes from the memory area referred to by SRC to the memory area referred to by dest; With strcpy void *memcpy_su (void *dest, void *src, unsigned int count) { ASSERT ((dest!=null) (src!=null)); char* bdest = (ch

Simulation Implementation memcpy Library function # include Copyright NOTICE: This article for Bo Master original article, without Bo Master permission not reproduced."C Language" simulation implements MEMCPY library function

The memcpy function in the The specific use is as follows:Where Y is the beginning address of the memory segment copied to, and X is the beginning of the memory segment from the copy side. The third parameter is the number of bytes of memory copied, which is used by sizeof to determine the number of bytes of the type.C + + memory copy function memcpy

First, sizeof is an operator, not a function, but when the operand is a type name you need to enclose the type name in parentheses (the operand is not required for the variable), and this rule makes sizeof look like a function. Second, if the operand of sizeof is a static array name, the result is the amount of space (in bytes) of the entire array, but if the operand is a dynamic array, it is only the size of a pointer variable (4byte on my machine). This is because arrays and pointers are actua

Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--> // ========================================================== ========================================== // Name: helloworld. cpp // Author: chio // Version: ver.1.0.0 // Copyright: suprasoft Inc ,. // Description: Todo // ========================================================== ========================================== # Include Iostream > # Include

Header file: string.hvoid *memcpy (void *dest, const void *SRC, size_t n);Function: Copies n bytes from the beginning of the memory address referred to by the source SRC to the starting position of the memory address referred to by the target destvoid *memset (void *s, int ch, size_t n);function: Replace n bytes (typedef unsigned int size_t) with the current position in s with ch and return S.Memset: The function is to populate a block of memory with

C language: Simulate memcpy # Define _ CRT_SECURE_NO_WARNINGS 1 # include

Use C language to simulate strcpy, strcat, strcat, memcpy, memmove 1. simulate Implementation of strcpy # include

1. Analog implementation strcpy#includeUse C language. Analog Implementation Strcpy,strcat,strcat,memcpy,memmove

// CFontDialog (LPLOGFONT lplfInitial = NULL, DWORD dwFlags = CF_EFFECTS | CF_SCREENFONTS, CDC * pdcPrinter = NULL, CWnd * pParentWnd = NULL ); // Show the font dialog with 12 point "Times New Roman" as // Selected font. /* LOGFONT lf; Memset ( lf, 0, sizeof (LOGFONT )); CClientDC dc (this ); Lf. lfHeight =-MulDiv (12, dc. GetDeviceCaps (LOGPIXELSY), 72 ); Strcpy (lf. lfFaceName, "Times New Roman "); CFontDialog dlg ( lf ); Dlg. DoModal ();*/ /* CFontDialog dlg; If (dlg. DoModal () = IDOK) {

/makeThis step causes problems.Make [1]: *** [rtppacket. Lo] Error 1: rtppacket. cpp: 51: Error: 'memcpy' was not declared in this scopeI don't know if many people will be unable to install jrtplib due to this situation, but the resources on csdn and the website I just mentioned will all have the same error. In fact, the solution is very easy. Just add the header file string. h to rtppack. cpp, that is, # include In addition, rtcpcompoundpacketbuilder

Strtol Convert the string A, B, and C into numbers in hexadecimal notation (10, 2, 16 ). # IncludeMain () Char A [] = "1000000000 "; Char B [] = "1000000000 "; Char C [] = "FFFF ";Printf ("A = % d/N", strtol (A, null, 10 )); Printf ("B = % d/N", strtol (B, null, 2 ));Printf ("C = % d/N", strtol (C, null, 16 )); A = 1000000000 B = 512C = 65535. Fprintf: Can be output to more types of devices, not just as printf defaults to stdout Memcpy