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Beginner
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how to use directory functions

Hi,
i'm trying do build my own application with the IPP and now i need to access a directory. Sadly the documentation of the IPP brings no help. Can somebody give me a sample how to use the vm_dir_open() and the vm_dir_read() functions please?

Thanks and regards,
Otto
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New Contributor I
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Quoting - Otto Wesso
Hi,
i'm trying do build my own application with the IPP and now i need to access a directory. Sadly the documentation of the IPP brings no help. Can somebody give me a sample how to use the vm_dir_open() and the vm_dir_read() functions please?

Thanks and regards,
Otto

Hi Otto,
The vm_dir_open() and vm_dir_read() functions are Unix style directory functions as described in the ums_manual.pdf file, table 5.10 : "
Directory traverse functions Have VM unique names and serve as wrappers for the specific directory traverse functions
Ipp32s vm_dir_open(vm_dir **dd, vm_char*path); Similar to Unix opendir
Ipp32s vm_dir_read(vm_dir *dd, vm_char *filename, int nchars); Similar to Unix readdir
".
Look at this as an a piece of sample with VM directory functions. The vm_dir_open() and vm_dir_read() functions are bold faced.

#if !defined(LINUX32) && !defined(OSX)
# include
# include
# if _MSC_VER >= 1400
# pragma warning(disable: 4996)
# endif
# define TFDNAME VM_STRING("TEST\tstfile.")
# define TFDIRFULL VM_STRING("TEST2\*.*")
#else
# define TFDNAME "TEST/tstfile."
# define TFDIRFULL VM_STRING("TEST2")
#endif // if !defined(LINUX32) && !defined(OSX)
#define MESSAGE_OK {cout << VM_STRING("....... OK") << endl; }
#define MESSAGE_FAIL {cout << VM_STRING("....... FAIL") << endl;}
#define TFDIR VM_STRING("TEST")
#define TFDFILES 5
#define FAIL_BREAK {cout << VM_STRING("....... FAIL") << endl; break; }
#define SMALLSTRING 2048

...
vm_dir *tsd;
vm_char s[SMALLSTRING];

cout << VM_STRING("directory read/delete operations") << endl;
cout << VM_STRING("create directory TEST and 5 files in it") << endl;
vm_char tfdname[32];
Ipp32u i;
do {
if (!vm_dir_mkdir(TFDIR)) FAIL_BREAK
for (i = 0; i < TFDFILES; ++i) {
vm_string_sprintf( tfdname, VM_STRING("%s%01d"), TFDNAME, i);
if (((tst = vm_file_fopen(tfdname, VM_STRING("w"))) != NULL) &&
(vm_file_fwrite((void *)tfdname, 1, (Ipp32s)vm_string_strlen(tfdname), tst) == (Ipp32s)vm_string_strlen(tfdname)))
vm_file_fclose(tst);
}
if (i < TFDFILES) FAIL_BREAK
/* read directory */
vm_string_sprintf(tfdname, VM_STRING("%s*"),TFDNAME);
Ipp32u j = 0;
// try to remove test directory
cout << VM_STRING("check TEST directory contentsn");
if (vm_dir_open(&tsd, TFDIRFULL)) {
cout << VM_STRING("directory opened OKn");
while (vm_dir_read(tsd, s, SMALLSTRING)) {
cout << VM_STRING("entry in : ") << s << endl;
++j;
}
vm_dir_close(tsd);
} else {
cout << VM_STRING("errno = ") << errno << endl;
FAIL_BREAK
}
/* remove files and test directory */
cout << VM_STRING("remove files and test directory") << endl;
for (i = 0; i < TFDFILES; ++i) {
vm_string_sprintf( tfdname, VM_STRING("%s%01d"), TFDNAME, i);
if (!vm_dir_remove(tfdname))
break;
}
if (i < TFDFILES) FAIL_BREAK;
if(!vm_dir_remove(TFDIR)) FAIL_BREAK;
MESSAGE_OK
} while(0);

Regards,
Alexander

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Beginner
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simply nice, now i understand. Thank you!

Otto
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