erreur: 'strstr' n'a pas été déclaré dans cette portée

Question

Je suis en train d'écrire une application sur framboise pi avec la mémoire partagée. J'utilise la fonction strstr() dans ma bibliothèque de mémoire partagée auto-écrite. Quand je compile la bibliothèque sur OS X avec clang ++ je n'obtiens aucune erreur. Si je le compile sur mon pi de framboise j'ai l'erreur: 'strstr' n'a pas été déclaré dans cette portée.

J'ai essayé de mettre à jour ma framboise mais sans succès, pouvez-vous me donner n'importe quel conseil ou solution quoi faire.

tête-Datei

#ifndef SHAREDMEMORY_H 
#define SHAREDMEMORY_H 

#include <string> 
#include <cstdlib> 
#include <stdio.h> 
#include <sys/types.h> 
#include <sys/stat.h> 
#include <unistd.h> 
#include <fcntl.h> 
#include <sys/mman.h> 
#include <iostream> 

#define MAX_SERVICES 99 

/** 
* Datei mit der Datenbank. 
*/ 
#define FILEPATH "database.dat" 
/** 
* Anzahl der Zeichen in der 
* Datenbank. 
*/ 
#define CHARACTERS 2500 
/** 
* Größe der Datenbank. 
*/ 
#define FILESIZE (CHARACTERS*sizeof(char)) 

class SharedMemory { 
public: 
    /** 
    * Constructor 
    */ 
    SharedMemory(); 
    /** 
    * Desctructor 
    */ 
    ~SharedMemory(); 
    /** 
    * Method to open file 
    * @param string: Path to file, has to exist 
    * @param int: for reading 0 
    *    for writing 1 
    * @return bool: true on success 
    *    false on error 
    */ 
    bool openFile(std::string, int); 
    /** 
    * Method to map file to memory 
    * @param string: Path to file, has to exist 
    * @param int: for reading 0 
    *    for writing 1 
    * @return bool: true on success 
    *    false on error 
    */ 
    bool mappingFile(int); 
    /** 
    * Method to remove file from memory 
    * @return bool: true on success 
    *    false on error 
    */ 
    bool unmapFile(); 
    /** 
    * Method to write information to file 
    * @param string: data to write 
    * e.g. string="#1:127.0.0.1:8000", #number range 0-99. 
    * @return bool: true on success 
    *    false on error 
    */ 
    bool set(std::string); 
    /** 
    * Method to read information from file 
    * @param string: need to cointains id, if success 
    *    then contains info from id. 
    * e.g. string="1", number range "0"-"99". 
    * @return bool: true on success 
    *    false on error 
    */ 
    bool get(std::string&); 
private: 
    /** 
    * Datei-Deskriptor. 
    */ 
    int fd; 
    /** 
    * Zeiger auf Dateiinhalt. 
    */ 
    char *mapPointer; 
    /** 
    * Path to file 
    */ 
    std::string filePath; 
}; 


#endif /* SHAREDMEMORY_H */ 

Cpp-Datei

#include "SharedMemory.h" 

SharedMemory::SharedMemory() { } 

SharedMemory::~SharedMemory() { } 

bool SharedMemory::openFile(std::string _path, int mode) { 
    if (mode) { 
     fd = open(_path.c_str(), O_RDWR, (mode_t)0600); 
    } else { 
     fd = open(_path.c_str(), O_RDONLY, (mode_t)0600); 
    } 
    if (fd == -1) { 
     return false; 
    } 

    return true; 
} 

bool SharedMemory::mappingFile(int mode){ 
    void* tmpPointer; 
    if (mode) { 
     tmpPointer = mmap(0, FILESIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); 
    } else { 
     tmpPointer = mmap(0, FILESIZE, PROT_READ, MAP_SHARED, fd, 0); 
    } 

    if(tmpPointer == MAP_FAILED) { 
     close(fd); 
     return false; 
    } 
    mapPointer = (char*) tmpPointer; 

    return true; 
} 

bool SharedMemory::unmapFile() { 
    int ret = munmap(mapPointer, FILESIZE); 
    close(fd); 
    if (ret == -1) { 
     return false; 
    } 

    return true; 
} 

bool SharedMemory::set(std::string s) { 
    /** 
    * Filter id, find the id in the file. 
    * If Values exist and id is valid, insert value 
    * -> if value not exists, insert "No_Service". 
    * if given id is invalid, return false 
    */ 
    int mid = s.find(";"); 
    int begin = s.find("#"); 
    std::string id = s.substr(begin + 1, mid - begin); 
    std::string info = s.substr(mid + 1, s.length()); 
    if (info == "") { 
     info = "No_Service"; 
    } 
    char* i = strstr(mapPointer, id.c_str()); 
    while (*i++ != ';'); 
    for (auto x: info) { 
     *i++ = x; 
    } 
    for (int j = 0; j < (20 - info.length()); ++j) { 
     *i++ = ' '; 
    } 

    return true; 
} 

bool SharedMemory::get(std::string& id){ 
    /** 
    * Filter id, find the id in the file. 
    * save data in string s. 
    */ 
    int tmp; 
    try { 
     tmp = stoi(id); 
    } catch (...) { 
     id = "No_Service"; 
     return false; 
    } 

    if (tmp > 100 || tmp < 1){ 
     id = "No_Service"; 
     return false; 
    } 

    id += ";"; 
    char* i = strstr(mapPointer, id.c_str()); 
    while (*i++ != ';'); 
    id = ""; 
    do { 
     id += *i++; 
    } while(*i != ' ' && *i != ';'); 

    if (id == "No_Service"){ 
     return false; 
    } 

    return true; 
} 

Answer 1

Essayez d'inclure cstring (et appelant std::strstr) ou dont string.h.

Ceci est spécifié dans la documentation: http://en.cppreference.com/w/cpp/string/byte/strstr