memcpy（转）

memcpy

　原型：extern void *memcpy(void *dest, void *src, unsigned int count);

　用法：#include <string.h>

　功能：由src所指内存区域复制count个字节到dest所指内存区域。

　说明：src和dest所指内存区域不能重叠，函数返回指向dest的指针。

　举例：

　// memcpy.c

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　#include <stdio.h>

　#include <string.h>

　int main(int argc, char* argv[])

　{

　char *s="Golden Global View";

　char d[20];

　clrscr();

　memcpy(d,s,strlen(s));

　d[strlen(s)]='\0';

　printf("%s",d);

　getchar();

　return 0;

　}

　截取view

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　#include <string.h>

　int main(int argc, char* argv[])

　{

　char *s="Golden Global View";

　char d[20];

　memcpy(d,s+14,4);

　//memcpy(d,s+14*sizeof(char),4*sizeof(char));也可

　d[5]='\0';

　printf("%s",d);

　getchar();

　return 0;

　}

　输出结果：

　View

　初始化数组

　char msg[10];

　memcpy(msg,0,sizeof(msg));

转自：http://doc.chinaunix.net/dotnet/200907/165174.shtml