[問題] 用VC去broadcast一組16進位數字

看板C_and_CPP (C/C++)作者cutem (大少爺)時間12年前 (2014/01/13 18:12)推噓3(3推 0噓 15→)

留言18則, 3人參與討論串1/2 (看更多)

開發平台(Platform):VC++ VC++ 問題(Question)：如何broadcast一組16進位資料餵入的資料(Input)： 0xbb0000dd 預期的正確結果(Expected Output)：用wireshark可以看到Data部份是4byte，然後在16進位部份會看到最後4byte是 bb 00 00 dd 錯誤結果(Wrong Output)：可以廣播、但最後4byte不正確程式碼(Code): int _tmain(int argc, _TCHAR* argv[]) { if(argc < 2) { std::cout << "Error in Syntax: UDPServer.exe <port no> <msg>"; return 0; } int portno = ::_wtoi(argv[1]); USES_CONVERSION; // char *p = W2A(argv[2]); WORD w = MAKEWORD(1,1); WSADATA wsadata; ::WSAStartup(w, &wsadata); SOCKET s = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP); if(s == -1) { std::cout << "Error in creating socket"; return 0; } char opt = 1; setsockopt(s, SOL_SOCKET, SO_BROADCAST, (char*)&opt, sizeof(char)); SOCKADDR_IN brdcastaddr; memset(&brdcastaddr,0, sizeof(brdcastaddr)); brdcastaddr.sin_family = AF_INET; brdcastaddr.sin_port = htons(portno); brdcastaddr.sin_addr.s_addr = INADDR_BROADCAST; int len = sizeof(brdcastaddr); // Byte[] msg = {0xbb,0x00,0x00,0xdd}; char sbuf[1024]; memset(sbuf,0,1024); sprintf_s(sbuf,8,"%1x%1x%1x%1x",(unsigned char)0xba,(unsigned char)0x00,(unsigned char)0x00,(unsigned char)0xba); printf("sbuf data:%x,%x,%x,%x\n",sbuf[0],sbuf[1],sbuf[2],sbuf[3]); std::cout << "sbuf len:\n"<<strlen(sbuf); int ret = sendto(s, sbuf, strlen(sbuf), 0, (sockaddr*)&brdcastaddr, len); //int ret = sendto(s, message, strlen(message), 0, (sockaddr*)&brdcastaddr, len); if(ret < 0) { std::cout << "Error broadcasting to the clients"; } else if(ret < strlen(sbuf)) { std::cout << "Not all data broadcasted to the clients"; } else { std::cout << "Broadcasting is done"; } ::closesocket(s); return 0; } 補充說明(Supplement): 此程式是在網路上撈到的，廣播部份是ok的，只是我一直無法將16進位數字正確的廣播出去 -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 118.163.2.22 ※ 編輯: cutem 來自: 118.163.2.22 (01/13 18:54) ※ 編輯: cutem 來自: 118.163.2.22 (01/13 18:55)

推

LPH66

01/13 20:32, , 1^F

01/13 20:32, 1^F

→

LPH66

01/13 20:32, , 2^F

01/13 20:32, 2^F

→

cutem

01/14 10:18, , 3^F

01/14 10:18, 3^F