1 |
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2 | #include "stdafx.h"
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3 | #include <stdlib.h>
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4 | #include <stdio.h>
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5 | #include <string.h>
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6 | #include <sys/utime.h>
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7 |
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8 | #include <boost/filesystem.hpp>
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9 |
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10 | #include <windows.h>
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11 |
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12 | int main(int argc, char *argv[])
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13 | {
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14 | time_t modtime = time(NULL) - 24 * 60 * 60;
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15 | FILE *f;
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16 |
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17 | if (argc < 3) {
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18 | printf("please provide 2 different test files paths on a network driver, i.e. '<prog> Y:\\afile.txt Y:\\bfile.txt'\n");
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19 | return 1;
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20 | }
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21 | char *boostfile = argv[1];
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22 | char *utimefile = argv[2];
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23 | //
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24 | // demonstrate the problem first
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25 | //
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26 | printf("\ntest boost::last_write_time(f,t) to modifty last write time on %s\n", boostfile);
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27 |
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28 | f = fopen(boostfile,"wb"); fwrite("X",1,1,f); fclose(f);
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29 | printf("%lld - original last write time\n", boost::filesystem::last_write_time(boostfile));
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30 |
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31 | f = fopen(boostfile,"r+b"); fwrite("X",1,1,f); fclose(f);
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32 | boost::filesystem::last_write_time(boostfile, modtime);
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33 | printf("%lld - last write time after calling boost::last_write_time to modify it\n", boost::filesystem::last_write_time(boostfile));
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34 |
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35 | f = fopen(boostfile,"r"); fclose(f);
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36 | printf("%lld [TEST:%s] last write opening for read - Expected %lld\n",
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37 | boost::filesystem::last_write_time(boostfile),
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38 | boost::filesystem::last_write_time(boostfile) == modtime ? "PASS" : "FAIL",
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39 | modtime);
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40 |
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41 | //
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42 | // demonstrate the problem expected behavior
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43 | //
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44 | printf("\ntest utime() on %s\n", utimefile);
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45 |
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46 | f = fopen(utimefile,"wb"); fwrite("X",1,1,f); fclose(f);
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47 | printf("%lld - original last write time\n", boost::filesystem::last_write_time(utimefile));
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48 |
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49 | f = fopen(utimefile,"r+b"); fwrite("X",1,1,f); fclose(f);
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50 |
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51 | struct utimbuf u;
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52 | u.actime = 0;
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53 | u.modtime = modtime;
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54 | utime(utimefile, &u);
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55 |
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56 | printf("%lld - last write time after calling utime() to modify it\n", boost::filesystem::last_write_time(utimefile));
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57 |
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58 | f = fopen(utimefile,"r"); fclose(f);
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59 | printf("%lld [TEST:%s] last write opening for read - Expected %lld\n",
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60 | boost::filesystem::last_write_time(utimefile),
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61 | boost::filesystem::last_write_time(utimefile) == modtime ? "PASS" : "FAIL",
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62 | modtime);
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63 |
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64 | //
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65 | // demonstrate perhaps how to fix it using FILE_GENERIC_WRITE rather than just FILE_WRITE_ATTRIBUTES
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66 | //
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67 | printf("\nshow 'better' windows API usage to modifty last write time on %s\n", boostfile);
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68 |
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69 | f = fopen(boostfile,"wb"); fwrite("X",1,1,f); fclose(f);
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70 | printf("%lld original last write time\n", boost::filesystem::last_write_time(boostfile));
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71 |
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72 | f = fopen(boostfile,"r+b"); fwrite("X",1,1,f); fclose(f);
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73 |
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74 | // using boost's technique as see in http://svn.boost.org/svn/boost/trunk/libs/filesystem/v3/src/operations.cpp (in last_write_time -- variant that modifies time)
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75 | // or http://svn.boost.org/svn/boost/trunk/libs/filesystem/v2/src/v2_operations.cpp (in set_file_write_time )
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76 | {
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77 | HANDLE h = CreateFileA(boostfile, FILE_GENERIC_WRITE,
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78 | FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE, 0,
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79 | OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0);
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80 |
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81 | FILETIME lwt;
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82 | __int64 temp = modtime;
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83 | temp *= 10000000;
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84 | temp += 116444736000000000LL;
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85 |
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86 | lwt.dwLowDateTime = static_cast<DWORD>(temp);
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87 | lwt.dwHighDateTime = static_cast<DWORD>(temp >> 32);
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88 |
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89 | SetFileTime(h, 0, 0, &lwt);
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90 | }
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91 | printf("%lld - last write time after calling native SetFileTime() with a handle with FILE_GENERIC_ACCESS\n", boost::filesystem::last_write_time(boostfile));
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92 |
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93 | f = fopen(boostfile,"r"); fclose(f);
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94 | printf("%lld [TEST:%s] last write opening for read - Expected %lld\n",
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95 | boost::filesystem::last_write_time(boostfile),
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96 | boost::filesystem::last_write_time(boostfile) == modtime ? "PASS" : "FAIL",
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97 | modtime);
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98 |
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99 | return 0;
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100 | }
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101 |
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