电话本-----添加错误命令处理

如果输入错误命令，返回提示信息

// 2.18.cpp : 定义控制台应用程序的入口点。//#include "stdafx.h"#include <windows.h>#include <string.h>const unsigned int MAX_LENGTH_OF_CMD = 300;const unsigned int MAX_LENGTH_OF_CMD_HEAD = 10;const char* DEFAULT_FILE_NAME = "temp.txt";/*strDefaultFileFullPath要确保足够的存储空间，建议为MAX_PATH*/bool GetDefaultFileFullPath(char *strDefaultFileFullPath, const char *strDefaultFileName, const char *strArgv0){int i = strlen(strArgv0) - 1;while(i >= 0){if(strArgv0[i] == '\\')break;i--;}if(i < 0){strcpy(strDefaultFileFullPath, strDefaultFileName);}else{strcpy(strDefaultFileFullPath, strArgv0);strcpy(strDefaultFileFullPath + i + 1, strDefaultFileName);}return true;}void DisplayDefaultFile(const char *strDefaultFileFullPath){FILE *fp = fopen(strDefaultFileFullPath, "r+");if(fp != NULL){while(1){char buf[MAX_PATH];if(fgets(buf, MAX_PATH, fp) == NULL)break;printf("%s", buf);}fclose(fp);}else{printf("Default file does not exist.\n");}}/*确保strCommandHead和strParameter有足够的空间，建议分别设为MAX_LENGTH_OF_CMD_HEAD、MAX_LENGTH_OF_CMD*/bool InterpretCommand(const char* strCommand, char *strCommandHead, char *strParameter){if(strlen(strCommand) < 3)return false;char cmd[MAX_LENGTH_OF_CMD];memset(cmd, 0, MAX_LENGTH_OF_CMD);strcpy(cmd, strCommand);cmd[3] = 0;strcpy(strCommandHead, cmd);if(strlen(strCommand) > 3)strcpy(strParameter, cmd + 4);return true;}void Usage(){printf("Import file: -ld path\n");printf("Export file: -sa path\n");printf("Save info  : -se\n");printf("Add info   : -ad name phone\n");}void EnterCommandLoop(){char cmd[MAX_LENGTH_OF_CMD];while(1){printf("Please input your command : ");memset(cmd, 0, MAX_LENGTH_OF_CMD);if(scanf("%[^\n]", cmd) == 0){fflush(stdin);continue;}fflush(stdin);char cmd_head[MAX_LENGTH_OF_CMD_HEAD];char cmd_parameter[MAX_LENGTH_OF_CMD];memset(cmd_head, 0, MAX_LENGTH_OF_CMD_HEAD);memset(cmd_parameter, 0, MAX_LENGTH_OF_CMD);if(!InterpretCommand(cmd, cmd_head, cmd_parameter)){printf("False command.\n");Usage();continue;}printf("Your command is : %s\n", cmd);if(strcmp(cmd_head, "-ld") == 0){printf("Needed load file is %s\n", cmd_parameter);continue;}if(strcmp(cmd_head, "-sa") == 0){printf("will export phone book to %s\n", cmd_parameter);continue;}if(strcmp(cmd_head, "-se") == 0){printf("will save phone book\n");continue;}if(strcmp(cmd_head, "-ad") == 0){printf("will add item(name phone): %s\n", cmd_parameter);continue;}if(strcmp(cmd_head, "-qt") == 0){printf("quit now ....\n");break;}printf("False command\n");Usage();}}int _tmain(int argc, _TCHAR* argv[]){char DefaultFileFullPath[MAX_PATH];GetDefaultFileFullPath(DefaultFileFullPath, DEFAULT_FILE_NAME, argv[0]);printf("Default file path: %s\n", DefaultFileFullPath);DisplayDefaultFile(DefaultFileFullPath);EnterCommandLoop();return 0;}