I'm having a rather weird error when things that should have no
effect are changed. The purpose of the program is to recursively
go through the directories, creating a DirEntry for each
file/folder found. The parts in try-catch are there to skip
anything that is unreachable. "C:\Users\All Users\Application
Data" is the first real problem I've had. This is because on
Windows 7, it is a locked shortcut, I presume for XP
compatibility. First, the code:
import std.algorithm;
import std.array;
import std.conv;
import std.datetime;
import std.exception;
import std.file;
import std.process;
import std.stdio;
import std.string;
void main()
{
writeln(scanDrive("C:\\Users", true).data.length);
}
alias Appender!(DirEntry[]) DirEntryAppender;
DirEntryAppender scanDrive(string drive, bool saving)
{
bool b = (drive == "C:\\Users\\All Users\\Application Data");
string[] names;
DirEntryAppender entries;
try
{
foreach (d; dirEntries(drive, SpanMode.shallow))//this is the
line that causes the error
{
}
}
catch (FileException fe)
{
return DirEntryAppender([]);
}
foreach (d; dirEntries(drive, SpanMode.shallow))
{
names ~= d.name;
}
if (saving)
{
DirEntry d = dirEntry(drive);
entries.put(d);
foreach (n; names)
{
try
{
d = dirEntry(n);
if (d.isDir && !canFind(d.name, "Windows") &&
!canFind(d.name, "Program Files") && !canFind(d.name,
"ProgramData") && !canFind(d.name, "Josh"))
entries.put(scanDrive(n, saving).data);
else
entries.put(d);
}
catch (FileException fe)
{
}
}
}
return entries;
}
The results are:
g si sp b w
0 0 0 0 1
0 0 0 1 1
0 0 1 0 0
0 0 1 1 0
0 1 1 0 0
0 1 1 1 0
1 0 0 0 1
1 0 0 1 1
1 0 1 0 0
1 0 1 1 1
1 1 1 0 0
1 1 1 1 1
g = compiled with -g
si = the if (saving) line, 0 means commented out with the
contents of the if left uncommented
sp = saving is a parameter, 0 means all occurrences commented
out, including the if (saving) line
b = bool b = ... line, 0 means commented out
w = works without error
The error that I'm getting is an infinite loop of:
object.Error: Access Violation
----------------
0x0040B426 in void
std.typecons.__T10RefCountedTS3std4file15DirIteratorImplVE3std8typecons24RefCountedAutoInitialize0Z.RefCounted.__dtor()
----------------
Bypasses std.file.FileException@std\file.d(2311)
=== Bypassed ===
std.file.FileException@std\file.d(2311): C:\Users\All
Users\Application Data: Access is denied.
----------------
0x0040F842 in bool std.file.cenforce!(bool).cenforce(bool, lazy
const(char)[], immutable(char)[], uint)
----------------
Does anybody know why simply creating an unused bool variable, or
compiling with -g would make it work? I'm using Windows 7, with
DMD v2.062.
Any help would be much appreciated.
Thanks,
Josh
