c++ - 写入大于2Gb的文件

Question

我写了一个文件，存储了从两个外部传感器读取的所有原始数据，我意识到当文件达到2Gb时程序会停止写数据，程序会继续工作，但不会在文件中写入更多内容。

我正在使用下一个代码(它是一个等待信号并写入文件的线程):

while(1)
{
    //Lock, Wait the signal and unlock
    pthread_mutex_lock(&mutex_WriteOFIMUandGPS);
    pthread_cond_wait(&cond_WriteOFIMUandGPS, &mutex_WriteOFIMUandGPS);
    X_CopySnapshot = X_Snapshot;
    Y_CopySnapshot = Y_Snapshot;
    Z_CopySnapshot = Z_Snapshot;
    Vx_CopySnapshot = Vx_Snapshot;
    Vy_CopySnapshot = Vy_Snapshot;
    Vz_CopySnapshot = Vz_Snapshot;
    HPL_CopySnapshot = HPL_Snapshot;
    HDOP_CopySnapshot = HDOP_Snapshot;
    StdPosX_CopySnapshot = StdPosX_Snapshot;
    StdPosY_CopySnapshot = StdPosY_Snapshot;
    StdPosZ_CopySnapshot = StdPosZ_Snapshot;
    pthread_mutex_unlock(&mutex_WriteOFIMUandGPS);


    //Get Time and Date
    now = time(0);
    localtm = localtime(&now);

    //Get millis
    gettimeofday(&tp, NULL);
    ms = round(tp.tv_usec / 1000);
    sprintf(buf,"%03d",(int)ms);

    //Empty strings
    DateTime = "";
    text.clear();
    text.str(string());

    //Store Data and Time information in a string
    text << localtm->tm_year+1900 << "/";
    text << (((localtm->tm_mon+1)<10) ? "0" : "") << localtm->tm_mon+1 << "/";
    text << ((localtm->tm_mday<10)? "0" : "") << localtm->tm_mday << ",";
    text << ((localtm->tm_hour<10)? "0" : "") << localtm->tm_hour << ":";
    text << ((localtm->tm_min<10)? "0" : "") << localtm->tm_min << ":";
    text << ((localtm->tm_sec<10)? "0" : "") << localtm->tm_sec << "."<< buf;
    DateTime = text.str();

    //Save data
    fprintf(fid,"%s,"
            "2,6,0,"                            // Alg_ID,SolStatus,EGNOSStatus,
            "%12.3f,%12.3f,%12.3f,"             // XyzUKF[0],XyzUKF[1],XyzUKF[2],
            "%8.8f,%8.8f,%8.8f,%7.18f,"         // V_UKF[0],V_UKF[1],V_UKF[2],HPL,
            "0,0,%5.2f,nan,nan,nan,nan,"        // NumSat,NumSatEx,HDOP,PDC1,PDC2,PDC3,PDC4,
            "%7.2f,%7.2f,%7.2f,"                // StdPos[0],StdPos[1],StdPos[2]
            "0,0,0,"                            // StdVel[0],StdVel[1],StdVel[2],
            "1,0,"                              // TypePositioning[0],TechUsedPos,
            "0,0,0,0,0,"                        // Observables
            "0,0,0,0,0,"                        // Observables
            "0,0,"                              // VPL,VDOP
            "0,"                                // TechRec
            "0,0,0,0,0,"                        // Observables
            "0,0,0,0,0\n",                      // Observables
            DateTime.c_str(),
            X_CopySnapshot, Y_CopySnapshot, Z_CopySnapshot,
            Vx_CopySnapshot, Vy_CopySnapshot, Vz_CopySnapshot,HPL_CopySnapshot,
            HDOP_CopySnapshot,
            StdPosX_CopySnapshot, StdPosY_CopySnapshot, StdPosZ_CopySnapshot);
}

我不知道是否有任何方法可以写入大于2Gb的文件，以及如何实现。

非常感谢您的帮助。

Answer 1

当您声明使用linux时:man 2打开:

O_LARGEFILE
(LFS)允许文件大小不能用off_t表示(但可以表示)的文件
在off64_t中)被打开。必须定义_LARGEFILE64_SOURCE宏(之前
(包括所有头文件)以获取此定义。设置_FILE_OFF-
最好将SET_BITS功能测试宏设置为64(而不是使用O_LARGEFILE)
在32位系统上访问大文件的方法(请参见feature_test_macros(7))。

否则，文件操作仅限于2GiB。