模拟网络通信

网络通信是个复杂的过程，程序的设计要考虑各种异常。网络中数据的传输可能出现各种异常情况，要考虑数据的完整性的和正确性等。下面是自己写的模拟网络数据传输中可能出现的异常。留个记号，方便以后参考。

#include <stdio.h>#include <string.h>#include <stdlib.h>void main(){char sRecvBuf[128];char sDataBuf[128];char pMsg[7][16] = {"000", "701R", "EJECTI0", "008", "01", "ON (", "101)001"};const char REJECTION_CMD[32] = "REJECTION (101)";const char SHAKE_CMD[16] = "@ZMY$";char sDataLen[8];int nDataLen = 0;int nPacketLen = 0;int nCurLen = 0;int index;memset(sRecvBuf, 0, sizeof(sRecvBuf));memset(sDataBuf, 0, sizeof(sDataBuf));memset(sDataLen, 0, sizeof(sDataLen));for (index = 0; index < 7; index ++){strcat(sRecvBuf, pMsg[index]);nCurLen = strlen(sRecvBuf);if (nCurLen > 6){strncpy(sDataLen, sRecvBuf, 4);nDataLen = atoi(sDataLen);nPacketLen = nDataLen + 6;if (nCurLen >= nPacketLen){int nLen;nLen = strlen(sDataBuf);strncat(sDataBuf, sRecvBuf + 6, nDataLen);sDataBuf[nLen + nDataLen] = 0;strncpy(sRecvBuf, sRecvBuf + nPacketLen, nCurLen - nPacketLen);memset(sRecvBuf + nCurLen - nPacketLen, 0, sizeof(sRecvBuf) - nCurLen + nPacketLen);}}printf("index = %d >> sRecvBuf = %s. sDataBuf = %s./n", index + 1, sRecvBuf, sDataBuf);printf("index = %d >> nCurLen = %d. nDataLen = %d. nPacketLen = %d./n", index + 1, nCurLen, nDataLen, nPacketLen);if (strstr(sDataBuf, REJECTION_CMD) != NULL){printf("recv rejection cmd./n");memset(sDataBuf, 0, sizeof(sDataBuf));nDataLen = 0;nPacketLen = 0;}if (strstr(sDataBuf, SHAKE_CMD) != NULL){printf("recv shake cmd./n");memset(sDataBuf, 0, sizeof(sDataBuf));nDataLen = 0;nPacketLen = 0;}}}