Re: Remote Directory Information - C# Discussion Boards

Remote Directory Information

4-Sep-02 11:11

U can allways try doin something like this,

public static void MyFunc(params object[] param)
{
  foreach (object obj in param)
  {
    Console.WriteLine(obj);
  }
}

but you would have to handle all the objects, making it rather pointless, except in some cases, like my delegate problem above. I hope this will work for it though Unsure | :~

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Re: Optional parameters

Nnamdi Onyeyiri4-Sep-02 22:28

Nnamdi Onyeyiri

4-Sep-02 22:28

never mind, ive just overloaded the function. Smile | :)

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4-Sep-02 4:38

Hi all,

I saw lots of example by using Directory, DirectoryInfo classes to retrieve local directory information. Can I use the same classes to retrieve remote directory information? If yes, how? If not, what C# classes can do the job? I really appreciate your help! Thanks!

Re: Remote Directory Information

Nnamdi Onyeyiri4-Sep-02 8:38

Nnamdi Onyeyiri

4-Sep-02 8:38

i too have thougt about this once. I think i found that you cant do this.

*IDEA* maybe you you send a WebRequest to the folder, and analyse the header sent back, i have no idea if this will work, but its worth a shot. Smile | :)

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Re: Remote Directory Information

leppie4-Sep-02 9:42

Re: Remote Directory Information

4-Sep-02 9:42

You could try map a drive or use the UNC name ( \\server\share ). Havent tried it, but i cant see why it should not work.

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D Shen5-Sep-02 9:18

D Shen

5-Sep-02 9:18

I will give them a shot,guys!! Thanks! Laugh | :laugh:

Assembly.LoadFrom using a network share...

Ryan Cromwell4-Sep-02 2:14

Ryan Cromwell

4-Sep-02 2:14

Does anyone know of reasons why LoadFrom with a network UNC wouldn't work (ie \\server\share). I've messed with IE's security zones, share permissions. I would even be willing to use webshares (ie http://server/share) which work for the LoadFrom but you can't do directory info calls on URI's. I currently have a pluggin structure that works beautifully, except that I cannot load the pluggin dlls over the network on the UNC or I can't iterate the potential pluggins on the web URI.

If anyone has any suggestions please let me know. I will update this with solutions I find.

Tanka,
Ryan Cromwell

Philip Fitzsimons4-Sep-02 2:21

Philip Fitzsimons

4-Sep-02 2:21

whats the exception that you get?

"When the only tool you have is a hammer, a sore thumb you will have."

Ryan Cromwell4-Sep-02 3:07

Ryan Cromwell

4-Sep-02 3:07

An unhandled exception of type 'System.ArgumentException' occurred in mscorlib.dll

Additional information: Invalid URL.

====================

Philip Fitzsimons4-Sep-02 3:09

Philip Fitzsimons

4-Sep-02 3:09

sounds like it does not like the format, have you tried a drive mapping?
or use a url format? file://

"When the only tool you have is a hammer, a sore thumb you will have."

Ryan Cromwell5-Sep-02 2:37

Ryan Cromwell

5-Sep-02 2:37

ya i've tried using file:// but you can't iterate the files that way at least not with DirectoryInfo.

leppie4-Sep-02 5:14

Marshalling: Rasap32.dll : EnumEntries

4-Sep-02 5:14

Hi there was a similar post about 1-2 weeks ago, I cant remmeber all the details, but it goes it little something like this (lepppie does the dance),

The SecurityPermissionFlags had to be set to Intranet.

Hope this helps or James sees this Smile | :)

He provided the answer last time around.

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leppie3-Sep-02 23:12

3-Sep-02 23:12

Hi all

This does not seem to work, very weird. The function returns 632 which translates to "An incorrect structure size was detected". Now this is the definition of the Structure according to MSDN and header file.

typedef struct _RASENTRYNAME { 
  DWORD  dwSize; 
  TCHAR  szEntryName[RAS_MaxEntryName + 1]; 
#if (WINVER >= 0x500)
  DWORD dwFlags;
  TCHAR  szPhonebookPath[MAX_PATH + 1];
#endif
} RASENTRYNAME;

I definine as :

[StructLayout(LayoutKind.Sequential)]
public class RASENTRYNAME 
{ 
	public int  dwSize; 
	[MarshalAs(UnmanagedType.ByValTStr, SizeConst = (int)Max.MaxEntryName + 1)]
	public string  szEntryName; 
	public int dwFlags;
	[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 256 + 1)]
	public string  szPhonebookPath;
}

The function def:

[DllImport("rasapi32", EntryPoint = "RasEnumEntries", CharSet = CharSet.Ansi)]
public static extern int EnumEntries(object menull, System.Text.StringBuilder phonebookpath,[In, Out] IntPtr rasentry, ref int size, out int entries);

And use it as :

RASENTRYNAME rasentry = new RASENTRYNAME();
size = rasentry.dwSize = Marshal.SizeOf(typeof(RASENTRYNAME));
size *= 10; //this is dumb, but we have to "guess" buffer size or specify enough size, same below
IntPtr prasentry = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(RASENTRYNAME)) * 10);
first = prasentry;
Marshal.StructureToPtr(rasentry, prasentry, true);
result = RASWrapper.EnumEntries(null, null, prasentry, ref size, out numcon);
for (int i = 0; i < numcon; i++)
{
	Marshal.PtrToStructure(prasentry,rasentry); 
	prasentry = new IntPtr(prasentry.ToInt32() + Marshal.SizeOf(typeof(RASENTRYNAME)));
}
Marshal.FreeHGlobal(first);

The other Enum functions in the DLL works fine, RasEnumConnections & RasEnumDevices, using the same code structure. Giving me correct values and doing exactly what it should.

I have tried everything (no kidding), but what is wrong here? Is the DLL broken?

Thanx all Smile | :)

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Stephane Rodriguez.3-Sep-02 23:29

3-Sep-02 23:29

I am building a smapp vcproj to test it. Will feed back later.

About RasEnumEntries, are you sure you call the right functions ? Dependency walker tells me there are 3 functions exported in rasapi32.dll : "RasEnumEntriesA", "RasEnumEntriesW", "RasEnumEntriesWow".
While you use explicitely ANSI charset, the "RasEnumEntries" should be mapped to "RasEnumEntriesA", but eh we are never sure of anything.

And I swallow a small raisin.

leppie3-Sep-02 23:43

3-Sep-02 23:43

Thx Stephane

Like I said I have tried all those things, I'll mail what I have so far, doesnt look like much, but it is Smile | :)

CHeers

PS: What is the Wow for? 64-bit? Wide on Wide?

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Stephane Rodriguez.3-Sep-02 23:59

3-Sep-02 23:59

Just tested it with exactly your code. Same 632 error.

RasError.h says :

#define ERROR_INVALID_SIZE (RASBASE+32)
/*
* An incorrect structure size was detected.
*/

And I swallow a small raisin.

leppie4-Sep-02 0:16

4-Sep-02 0:16

But what is wrong with the struct size? Cry | :((

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Stephane Rodriguez.4-Sep-02 0:25

4-Sep-02 0:25

I have just tested the code you have forwarded me :

RASWrapper.EnumConnections --> fails
RASWrapper.RasEnumDevices --> ok
RASWrapper.EnumEntries --> fails

And I swallow a small raisin.

leppie4-Sep-02 0:48

4-Sep-02 0:48

StephaneRodriguez wrote:
RASWrapper.EnumConnections --> fails

Does it fail (iow return != 0) ? If so, state error code plz.

It wont return values if u dont have an active dialup connection(s).

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Stephane Rodriguez.4-Sep-02 1:24

4-Sep-02 1:24

The return value in both cases is 632.

Indeed, that's what I was wondering, as I am not using dialup at all to connect.

And I swallow a small raisin.

leppie4-Sep-02 1:48

4-Sep-02 1:48

Hmm, very strange....

These are my struct sizes with the results executed in the same order as the file i sent you.

EnumConnections
Size: 704
Result: 0

EnumDevices
Size: 152
Result: 0

EnumEntries
Size: 528
Result: 632

The API is bad for marshalling Frown | :(

Maybe in C++ its easy, but I cant think why the function works so "stupidly".

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leppie4-Sep-02 1:55

4-Sep-02 1:55

OK i see i made a problem with MAX_PATH , iwas under the impression its 256 and not 260. DOPE Blush | :O

Now i get same results as u Frown | :(

I guess i'll have to play with the numbers then....

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Stephane Rodriguez.4-Sep-02 2:13