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recv 函数
在一个已经连接的套接字上接收数据。
函数原型：
int recv (
SOCKET s,char * buf,int len,int flags );
参数
s
类型：SOCKET
一个已建立连接的套接字标识符。
buf
类型：char *
将要接收数据的缓冲区指针。
len
类型：int
buf指向参数的大小，单位为字节
flags
类型：int
指定发送的方式，一般为0。
返回值
类型：int
成功，返回接收的字节数。如果链接已经正常关闭，返回0。
失败，返回 SOCKET_ERROR 。
失败，返回 SOCKET_ERROR 。
备注
调用 send 函数可发送数据。
支持
| 最低桌面系统支持 | Windows Vista |
| 头文件 | Winsock2.h |
| 库 | Ws2_32.lib |
| DLL | Ws2_32.dll |
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