[c语言中 beep是个什么函数]是发声函数，运行后通过主板喇叭唱出旋律，可以试试下面： TC 试： #include<dos.h> #include<conio.h> #include<stdlib.h> /* this founction plays sound until hit any key */ v...+阅读
//UDP服务代码 // Module Name: Receiver.c // // Description: // This sample receives UDP datagrams by binding to the specified // interface and port number and then blocking on a recvfrom() // call // // Compile: // cl -o Receiver Receiver.c ws2_32.lib // // Command line options: // sender [-p:int] [-i:IP][-n:x] [-b:x] // -p:int Local port // -i:IP Local IP address to listen on // -n:x Number of times to send message // -b:x Size of buffer to send // #include#include#include#define DEFAULT_PORT 5150 #define DEFAULT_COUNT 25 #define DEFAULT_BUFFER_LENGTH 4096 int iPort = DEFAULT_PORT; // Port to receive on DWORD dwCount = DEFAULT_COUNT, // Number of messages to read dwLength = DEFAULT_BUFFER_LENGTH; // Length of receiving buffer BOOL bInterface = FALSE; // Use an interface other than // default char szInterface[32]; // Interface to read datagrams from // // Function: usage: // // Description: // Print usage information and exit // void usage() { printf(＂usage: sender [-p:int] [-i:IP][-n:x] [-b:x]\n\n＂); printf(＂ -p:int Local port\n＂); printf(＂ -i:IP Local IP address to listen on\n＂); printf(＂ -n:x Number of times to send message\n＂); printf(＂ -b:x Size of buffer to send\n\n＂); ExitProcess(1); } // // Function: ValidateArgs // // Description: // Parse the command line arguments, and set some global flags to // indicate what actions to perform // void ValidateArgs(int argc, char **argv) { int i; for(i = 1; i3) iPort = atoi(&argv[i][3]); break; case 'n': // Number of times to receive message if (strlen(argv[i]) >3) dwCount = atol(&argv[i][3]); break; case 'b': // Buffer size if (strlen(argv[i]) >3) dwLength = atol(&argv[i][3]); break; case 'i': // Interface to receive datagrams on if (strlen(argv[i]) >3) { bInterface = TRUE; strcpy(szInterface, &argv[i][3]); } break; default: usage(); break; } } } } // // Function: main // // Description: // Main thread of execution. Initialize Winsock, parse the command // line arguments, create a socket, bind it to a local interface // and port, and then read datagrams. // int main(int argc, char **argv) { WSADATA wsd; SOCKET s; char *recvbuf = NULL; int ret, i; DWORD dwSenderSize; SOCKADDR_IN sender, local; // Parse arguments and load Winsock // ValidateArgs(argc, argv); if (WSAStartup(MAKEWORD(2,2), &wsd) != 0) { printf(＂WSAStartup failed!\n＂); return 1; } // Create the socket and bind it to a local interface and port // s = socket(AF_INET, SOCK_DGRAM, 0); if (s == INVALID_SOCKET) { printf(＂socket() failed; %d\n＂, WSAGetLastError()); return 1; } local.sin_family = AF_INET; local.sin_port = htons((short)iPort); if (bInterface) local.sin_addr.s_addr = inet_addr(szInterface); else local.sin_addr.s_addr = htonl(INADDR_ANY); if (bind(s, (SOCKADDR *)&local, sizeof(local)) == SOCKET_ERROR) { printf(＂bind() failed: %d\n＂, WSAGetLastError()); return 1; } // Allocate the receive buffer // recvbuf = GlobalAlloc(GMEM_FIXED, dwLength); if (!recvbuf) { printf(＂GlobalAlloc() failed: %d\n＂, GetLastError()); return 1; } // Read the datagrams // for(i = 0; i
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