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memcpy function usage

Oct 22, 2019 am 09:45 AM

memcpy指的是C和C++使用的内存拷贝函数,函数原型为void *memcpy(void *destin, void *source, unsigned n);函数的功能是从源内存地址的起始位置开始拷贝若干个字节到目标内存地址中,即从源source中拷贝n个字节到目标destin中。

memcpy function usage

函数原型

void *memcpy(void *destin, void *source, unsigned n);

参数

destin-- 指向用于存储复制内容的目标数组,类型强制转换为 void* 指针。

source-- 指向要复制的数据源,类型强制转换为 void* 指针。

n-- 要被复制的字节数。

返回值

该函数返回一个指向目标存储区destin的指针。

功能

从源source所指的内存地址的起始位置开始拷贝n个字节到目标destin所指的内存地址的起始位置中。 [2] 

所需头文件

C语言:#include

C++:#include

示例:

作用:将s中的字符串复制到字符数组d中。

//memcpy.c
#include <stdio.h>
#include <string.h>
int main()
{
    char* s="GoldenGlobalView";
    char d[20];
    clrscr();
    memcpy(d,s,(strlen(s)+1));        //+1 是为了将字符串后面的&#39;\0&#39;字符结尾符放进来,去掉+1可能出现乱码
    printf("%s",d);
    getchar();
    return 0;
}

输出结果:Golden Global View

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