C语言udp接收函数 c udp编程
实现UDP协议传输的C语言程序。如被采纳，可追加悬赏，盼高手指教，不胜感激！！！
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int WINAPI icePub_UdpSendAndReceive(char *sendBuffer,int bufferLen,char *strIP,int port,char *receiveBuffer,int timeoutSeconds,int retryCounts)
输入：sendBuffer 发送的数据
bufferLen sendBuffer的长度
strIP 服务端地址
port 端口
timeoutSeconds 超时时间，秒
retryCounts 接收失败重发次数
输出：receiveBuffer 接收的数据
返回码：接收数据的长度
char buff[1024],buff2[1024*10];
int receiveLen;
strcpy(buff,"tag:01\r\ncommand:reboot\r\ndata:none\r\n");
typedef int (WINAPI ICEPUB_UDPSENDANDRECEIVE)(char *sendBuffer,int bufferLen,char *strIP,int port,char *receiveBuffer,int timeoutSeconds,int retryCounts);
ICEPUB_UDPSENDANDRECEIVE *icePub_UdpSendAndReceive = 0;
HINSTANCE hDLLDrv = LoadLibrary("icePubDll.dll");
if(hDLLDrv)
icePub_UdpSendAndReceive=(ICEPUB_UDPSENDANDRECEIVE *)GetProcAddress(hDLLDrv,"icePub_UdpSendAndReceive");
if(icePub_UdpSendAndReceive)
receiveLen=icePub_UdpSendAndReceive(buff,strlen(buff),"192.168.1.111",6000,buff2,15,1);
if(hDLLDrv)
FreeLibrary(hDLLDrv);
AfxMessageBox(buff2);
求助，基于C语言的UDP通信问题发送、接收端口问题
bind一下就可以
int s = socket(AF_INET, SOCK_DGRAM, 0);
struct sockaddr_in local= {0};
local.sin_family = AF_INET;
local.sin_port = htons(60200);
inet_aton("192.168.3.100", (struct in_addr *)local.sin_addr.s_addr);//换成你的IP地址
bind(s, (struct sockaddr *)local, sizeof(local));
有没有windows下c语言实现udp协议的代码
Windows下C语言的Socket编程例子（TCP和UDP）
一。 TCP
server端：
复制代码
1 #include "stdafx.h"
2 #include stdio.h
3 #include winsock2.h
4
5 #pragma comment(lib,"ws2_32.lib")
6
7 int main(int argc, char* argv[])
8 {
9 //初始化WSA
10 WORD sockVersion = MAKEWORD(2,2);
11 WSADATA wsaData;
12 if(WSAStartup(sockVersion, wsaData)!=0)
13 {
14 return 0;
15 }
16
17 //创建套接字
18 SOCKET slisten = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
19 if(slisten == INVALID_SOCKET)
20 {
21 printf("socket error !");
22 return 0;
23 }
24
25 //绑定IP和端口
26 sockaddr_in sin;
27 sin.sin_family = AF_INET;
28 sin.sin_port = htons(8888);
29 sin.sin_addr.S_un.S_addr = INADDR_ANY;
30 if(bind(slisten, (LPSOCKADDR)sin, sizeof(sin)) == SOCKET_ERROR)
31 {
32 printf("bind error !");
33 }
34
35 //开始监听
36 if(listen(slisten, 5) == SOCKET_ERROR)
37 {
38 printf("listen error !");
39 return 0;
40 }
41
42 //循环接收数据
43 SOCKET sClient;
44 sockaddr_in remoteAddr;
45 int nAddrlen = sizeof(remoteAddr);
46 char revData[255];
47 while (true)
48 {
49 printf("等待连接...\n");
50 sClient = accept(slisten, (SOCKADDR *)remoteAddr, nAddrlen);
51 if(sClient == INVALID_SOCKET)
52 {
53 printf("accept error !");
54 continue;
55 }
56 printf("接受到一个连接：%s \r\n", inet_ntoa(remoteAddr.sin_addr));
57
58 //接收数据
59 int ret = recv(sClient, revData, 255, 0);
60 if(ret 0)
61 {
62 revData[ret] = 0x00;
63 printf(revData);
64 }
65
66 //发送数据
67 char * sendData = "你好，TCP客户端！\n";
68 send(sClient, sendData, strlen(sendData), 0);
69 closesocket(sClient);
70 }
71
72 closesocket(slisten);
73 WSACleanup();
74 return 0;
75 }
复制代码
client端：
复制代码
1 #include "stdafx.h"
2 #include WINSOCK2.H
3 #include STDIO.H
4
5 #pragma comment(lib,"ws2_32.lib")
6
7
8 int main(int argc, char* argv[])
9 {
10 WORD sockVersion = MAKEWORD(2,2);
11 WSADATA data;
12 if(WSAStartup(sockVersion, data) != 0)
13 {
14 return 0;
15 }
16
17 SOCKET sclient = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
18 if(sclient == INVALID_SOCKET)
19 {
20 printf("invalid socket !");
21 return 0;
22 }
23
24 sockaddr_in serAddr;
25 serAddr.sin_family = AF_INET;
26 serAddr.sin_port = htons(8888);
27 serAddr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
28 if (connect(sclient, (sockaddr *)serAddr, sizeof(serAddr)) == SOCKET_ERROR)
29 {
30 printf("connect error !");
31 closesocket(sclient);
32 return 0;
33 }
34 char * sendData = "你好，TCP服务端，我是客户端!\n";
35 send(sclient, sendData, strlen(sendData), 0);
36
37 char recData[255];
38 int ret = recv(sclient, recData, 255, 0);
39 if(ret 0)
40 {
41 recData[ret] = 0x00;
42 printf(recData);
43 }
44 closesocket(sclient);
45 WSACleanup();
46 return 0;
47 }
复制代码
二. UDP
SERVER 端
复制代码
1 #include "stdafx.h"
2 #include stdio.h
3 #include winsock2.h
4
5 #pragma comment(lib, "ws2_32.lib")
6
7 int main(int argc, char* argv[])
8 {
9 WSADATA wsaData;
10 WORD sockVersion = MAKEWORD(2,2);
11 if(WSAStartup(sockVersion, wsaData) != 0)
12 {
13 return 0;
14 }
15
16 SOCKET serSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
17 if(serSocket == INVALID_SOCKET)
18 {
19 printf("socket error !");
20 return 0;
21 }
22
23 sockaddr_in serAddr;
24 serAddr.sin_family = AF_INET;
25 serAddr.sin_port = htons(8888);
26 serAddr.sin_addr.S_un.S_addr = INADDR_ANY;
27 if(bind(serSocket, (sockaddr *)serAddr, sizeof(serAddr)) == SOCKET_ERROR)
28 {
29 printf("bind error !");
30 closesocket(serSocket);
31 return 0;
32 }
33
34 sockaddr_in remoteAddr;
35 int nAddrLen = sizeof(remoteAddr);
36 while (true)
37 {
38 char recvData[255];
39 int ret = recvfrom(serSocket, recvData, 255, 0, (sockaddr *)remoteAddr, nAddrLen);
40 if (ret 0)
41 {
42 recvData[ret] = 0x00;
43 printf("接受到一个连接：%s \r\n", inet_ntoa(remoteAddr.sin_addr));
44 printf(recvData);
45 }
46
47 char * sendData = "一个来自服务端的UDP数据包\n";
48 sendto(serSocket, sendData, strlen(sendData), 0, (sockaddr *)remoteAddr, nAddrLen);
49
50 }
51 closesocket(serSocket);
52 WSACleanup();
53 return 0;
54 }
复制代码
CLIENT 端
复制代码
1 #include "stdafx.h"
2 #include stdio.h
3 #include winsock2.h
4
5 #pragma comment(lib, "ws2_32.lib")
6
7 int main(int argc, char* argv[])
8 {
9 WORD socketVersion = MAKEWORD(2,2);
10 WSADATA wsaData;
11 if(WSAStartup(socketVersion, wsaData) != 0)
12 {
13 return 0;
14 }
15 SOCKET sclient = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
16
17 sockaddr_in sin;
18 sin.sin_family = AF_INET;
19 sin.sin_port = htons(8888);
20 sin.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
21 int len = sizeof(sin);
22
23 char * sendData = "来自客户端的数据包.\n";
24 sendto(sclient, sendData, strlen(sendData), 0, (sockaddr *)sin, len);
25
26 char recvData[255];
27 int ret = recvfrom(sclient, recvData, 255, 0, (sockaddr *)sin, len);
28 if(ret 0)
29 {
30 recvData[ret] = 0x00;
31 printf(recvData);
32 }
33
34 closesocket(sclient);
35 WSACleanup();
36 return 0;
37 }
文章名称：C语言udp接收函数 c udp编程
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