控制檯中解析用戶輸入的命令行參數(argc argv)

命令行解析：argc argv
解析例子： tail -hlocalhost -p8002 -l200或 tail -hlocalhost -p 8002 -l 200

 

 

 

*.h:
#include <unistd.h> #define COMMAND_LINE_LENGTH 2048 #ifdef WIN32 #include "windows.h" #define strtok_r( _s, _sep, _lasts ) / ( *(_lasts) = strtok( (_s), (_sep) ) ) #else #endif

 

*.cpp:

QString tmpStr = "tail -l20 -e123 "; char *argv[128]; /* Collected argv[] array */ int argc; /* My argc value */ char *svptr; /* strtok_r() updates this */ char *s; /* Returned strtok_r() pointer */ char buf[COMMAND_LINE_LENGTH]; /* Command buffer */ int x; /* Work index */ static const char delim[] = " /t/n"; /* Delimiters */ int cmdLen = tmpStr.toUtf8().size(); //命令行長度 if(cmdLen > COMMAND_LINE_LENGTH -1 ) return; memcpy(buf,tmpStr.toUtf8().data(),cmdLen ); /* Fake a command */ *(buf + cmdLen) = 0; s = strtok_r(buf,delim,&svptr); /* First call */ argc = 0; /* Start on my_argv[0] */ while ( s != 0 ) { argv[argc++] = s; /* Save argv[] value */ s = strtok_r(NULL,delim,&svptr); /* Parse next tkn */ } argv[argc] = 0; /* null in last entry */ QString cmdStr = QObject::tr(argv[0]); if (cmdStr.toLower() == "tail") { QString lineCount; QString eValue; bool p_bool = false; int optch; static const char optstring[] = "l:e:";//多個參數的寫法："Q:q:s:S:K:k:" optind = 1; while((optch = getopt(argc,argv,optstring)) != -1) { switch(optch) { case 'l': //跟optstring 串裏的參數相對應，如果有N個參數就寫N個case lineCount = QObject::tr(optarg); //取到參數l後的值 break; case 'e': //跟optstring 串裏的參數相對應，如果有N個參數就寫N個case eValue = QObject::tr(optarg); //取到參數e後的值 break; default: //錯誤處理 ; } } }

 

下面是我項目中的實現代碼(封裝成函數方便調用)：

#include <QtCore> #include <QCoreApplication> #include <QHash> #include <unistd.h> #define COMMAND_LINE_LENGTH 2048 #ifdef WIN32 #include "windows.h" #define strtok_r( _s, _sep, _lasts ) / ( *(_lasts) = strtok( (_s), (_sep) ) ) #else #endif ///解析命令行參數 /** @param cmdStr 命令行參數 如：tail -hlocalhost -p8002 -l200 @param optstring 參數串 如："h:p:l:" @return QHash類型 hash["cmd"] = "tail" hash["h"] = "localhost" hash["p"] = "8002" hash["l"] = "200" */ QHash<QString, QString> analysisCmdParams(const QString argvStr,const char* optstring); int main(int argc, char* argv[]) { QCoreApplication app(argc, argv); QTextCodec::setCodecForTr(QTextCodec::codecForName("UTF-8")); QStringList argvList = QCoreApplication::arguments(); argvList.removeFirst(); QString argvStr = argvList.join(" "); qDebug()<<QObject::tr("參數：")<<argvStr; qDebug()<<analysisCmdParams(argvStr,"h:p:l:"); return 0; return app.exec(); } QHash<QString, QString> analysisCmdParams(const QString argvStr, const char* optstring) { QHash<QString, QString> hash; QString commandLineStr = argvStr; char *myArgv[128]; /* Collected argv[] array */ int myArgc; /* My argc value */ char *svptr; /* strtok_r() updates this */ char *s; /* Returned strtok_r() pointer */ char buf[COMMAND_LINE_LENGTH]; /* Command buffer */ int x; /* Work index */ static const char delim[] = " /t/n"; /* Delimiters */ int cmdLen = commandLineStr.toUtf8().size(); //命令行長度 if(cmdLen > COMMAND_LINE_LENGTH -1 ) return hash; memcpy(buf,commandLineStr.toUtf8().data(),cmdLen ); /* Fake a command */ *(buf + cmdLen) = 0; s = strtok_r(buf,delim,&svptr); /* First call */ myArgc = 0; /* Start on my_argv[0] */ while ( s != 0 ) { myArgv[myArgc++] = s; /* Save argv[] value */ s = strtok_r(NULL,delim,&svptr); /* Parse next tkn */ } myArgv[myArgc] = 0; /* null in last entry */ QString cmdStr = QObject::tr(myArgv[0]); hash["cmd"] = cmdStr; QString lineCountStr; int optch; optind = 1; while((optch = getopt(myArgc,myArgv,optstring)) != -1) { hash[QString(char(optch))] = QObject::tr(optarg); } return hash; }

運行結果：