C# Discussion Boards - CodeProject

blackjack21507-Aug-08 1:07

blackjack2150

7-Aug-08 1:07

What's the problem? If you have an equivalent for the MF_Request function (which I have no idea what it is), the translation is trivial.

Raheem MA7-Aug-08 1:15

Raheem MA

7-Aug-08 1:15

Thanks for quick response,

Its not a predefined function, just I want to know the equivalent syntax thats it.

Thanks

Guffa7-Aug-08 3:06

Guffa

7-Aug-08 3:06

byte[] CardType = new byte[2];

stu = MF_Request(DeviceAddr, 0, CardType);
Message("Request Card", stu);

string str = null;
if (stu == 0) {
  str = string.Format(" ==> CardType(Hex): {0:x2}{1:x2}", CardType[0], CardType[1]);
}

Despite everything, the person most likely to be fooling you next is yourself.

Dave Doknjas7-Aug-08 12:56

Dave Doknjas

7-Aug-08 12:56

(via C++ to C# Converter):

byte[] CardType = new byte[2];

stu = MF_Request(DeviceAddr, 0, CardType);
Message("Request Card", stu);

string str;
string code = new string(new char[100]);
if (stu == 0)
{
str = " ==> CardType(Hex): ";
code = string.Format("{0:X2}{1:X2}", CardType[0], CardType[1]);
str += code;
}

David Anton
http://www.tangiblesoftwaresolutions.com
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pop3 encoding problems

GeorgeBerry7-Aug-08 0:30

7-Aug-08 0:30

I got a lib file from http://69.10.233.10/KB/IP/pop3client.aspx[^], and i was hoping someone could hep me with a problem im having.

I normally use thunderbird, so all the tests i do, i compare with the results from thunderbird. When i try to retrieve a plain text mail with the code i downloaded (above), it works great. The problem occurs when i try to download a compressed file (GZip compression algorythm).

This works fine with thunderbird, but the code i downloaded seems to hack up the file. When i compared the results with a hex editor (EditpadPro), the difference in files is enormous, your src seems to change the chars around (eg first 7 hex from thunderbird: 02 00 00 00 FF FF 73, first 7 from your src: 41 67 41 41 41 50 2F), also when i download the file with thunderbird is's 98 bytes, and when i use code i downloaded, the file size is 138 bytes.

This tells me that the file is still ok on the SMTP server, it's just when it gets downloaded. So im assuming its a encoding problem (not 100% sure).

Iv tried this with .Net 2.0, and Mono 1.9.1.

Thanks in advance.
George.

leppie7-Aug-08 2:54

7-Aug-08 2:54

GeorgeBerry wrote:
The problem occurs when i try to download a compressed file (GZip compression algorythm).

So, did you decompress the file after you downloaded it?

xacc.ide - now with TabsToSpaces support
IronScheme - 1.0 alpha 4a out now (29 May 2008)

GeorgeBerry7-Aug-08 3:00

7-Aug-08 3:00

When i try to decompress the files, it doesnt work, i get an exception coz the file isnt in its origional state.

leppie7-Aug-08 3:04

7-Aug-08 3:04

GeorgeBerry wrote:
i get an exception coz the file isnt in its origional state.

Can you paste the exception?

Have you tried downloading the file manually and added a .gz extension, and checked inside the compressed file with WinZip/WinRAR?

xacc.ide - now with TabsToSpaces support
IronScheme - 1.0 alpha 4a out now (29 May 2008)

GeorgeBerry7-Aug-08 3:26

7-Aug-08 3:26

The compression algorythm i use doesnt play well with gzip, and other progs, it doesnt have all the wrapper classes, and checks that they use, so only a bare GZip decompression stream will be able to decompress it.

The thing is, that i need to be able to download it with the lib file (mentioned above).

Also if i download the entire email with thunderbird, the chars are exactly the same as the with the lib file, its only when i tell thunderbird to download that attachment, that it works properly. Dont know if this behaviour provides necessary info or not.

Thanks.

leppie7-Aug-08 3:31

7-Aug-08 3:31

GeorgeBerry wrote:
The compression algorythm i use doesnt play well with gzip

Which one are you using? Why not use the builtin stuff in .NET?

GeorgeBerry wrote:
Also if i download the entire email with thunderbird, the chars are exactly the same as the with the lib file, its only when i tell thunderbird to download that attachment, that it works properly. Dont know if this behaviour provides necessary info or not.

You sure the attachment is not in BASE64 instead of being compressed? This would make sense in light of your observations.

xacc.ide - now with TabsToSpaces support
IronScheme - 1.0 alpha 4a out now (29 May 2008)

GeorgeBerry7-Aug-08 3:43

7-Aug-08 3:43

I am using the System.IO.Compression class, but if you use this, you cant just pull the compressed data out from any ol' compression app.

well, as far as iv been told, base64, is the textual interpretation of a binary file, so in this case, it would seem that it is base64. However when i try to
byte[] TempArr = System.Convert.FromBase64String(DownloadedText);
I get the exception message "Invalid character found.".

Just a side not, i dont know that much about encodings, just a little. This is the first time iv had to create a POP3 client.

leppie7-Aug-08 3:45

7-Aug-08 3:45

GeorgeBerry wrote:
well, as far as iv been told, base64, is the textual interpretation of a binary file, so in this case, it would seem that it is base64. However when i try to
byte[] TempArr = System.Convert.FromBase64String(DownloadedText);
I get the exception message "Invalid character found.".

You are probably passing too much data (it expects only the attachment bit, the garbled text), but I think you are on the right path with Base64 Smile | :)

xacc.ide - now with TabsToSpaces support
IronScheme - 1.0 alpha 4a out now (29 May 2008)

GeorgeBerry7-Aug-08 3:58

7-Aug-08 3:58

When i try to convert:
This is a multi-part message in MIME format.
--------------060102020601080008090504
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit

--------------060102020601080008090504
Content-Type: application/octet-stream;
name="sig.zpf"
Content-Transfer-Encoding: base64
Content-Disposition: attachment;
filename="sig.zpf"

AgAAAP//c0/NL0pPVXBKLSqq5ApJzUktKUpMTi1S0AgoqdRU8ClJ4XLNTczMUUgHq3MogavQ
S87Xq0oEabFS0DAwMtRUMDEy0TW3tDDgck7NAQoaWBjrmhqb6RqbGJhzAQA=
--------------060102020601080008090504--

i get the error "Invalid character found.", when i try to convert:
--------------060102020601080008090504
Content-Type: application/octet-stream;
name="sig.zpf"
Content-Transfer-Encoding: base64
Content-Disposition: attachment;
filename="sig.zpf"

AgAAAP//c0/NL0pPVXBKLSqq5ApJzUktKUpMTi1S0AgoqdRU8ClJ4XLNTczMUUgHq3MogavQ
S87Xq0oEabFS0DAwMtRUMDEy0TW3tDDgck7NAQoaWBjrmhqb6RqbGJhzAQA=
--------------060102020601080008090504--

i get "Invalid length.", and when i try to convert:
AgAAAP//c0/NL0pPVXBKLSqq5ApJzUktKUpMTi1S0AgoqdRU8ClJ4XLNTczMUUgHq3MogavQ
S87Xq0oEabFS0DAwMtRUMDEy0TW3tDDgck7NAQoaWBjrmhqb6RqbGJhzAQA=

i get the error "Invalid character found.".

Yeeh, iv tried all 3... i know "reaching for straws" right.
lol, i just cant think of anything else too try.

Thanks for the replies, definately getting closer too the solution.

leppie7-Aug-08 4:18

7-Aug-08 4:18

Almost there!

This is the only bit you need to decode:

AgAAAP//c0/NL0pPVXBKLSqq5ApJzUktKUpMTi1S0AgoqdRU8ClJ4XLNTczMUUgHq3MogavQ
S87Xq0oEabFS0DAwMtRUMDEy0TW3tDDgck7NAQoaWBjrmhqb6RqbGJhzAQA=

I cant be sure, but it looks like it is always ending with a '='. You may have to remove the newline characters too.

Good luck Smile | :)

xacc.ide - now with TabsToSpaces support
IronScheme - 1.0 alpha 4a out now (29 May 2008)

Jacques Bosch7-Aug-08 9:50

Jacques Bosch

7-Aug-08 9:50

George. You can't try to decode the entire mime part as it's not encoded. You can only decode the data that is encoded with Base64, which is:

AgAAAP//c0/NL0pPVXBKLSqq5ApJzUktKUpMTi1S0AgoqdRU8ClJ4XLNTczMUUgHq3MogavQ
S87Xq0oEabFS0DAwMtRUMDEy0TW3tDDgck7NAQoaWBjrmhqb6RqbGJhzAQA=

I could decode it fine.
When I run this:

			string test = @"AgAAAP//c0/NL0pPVXBKLSqq5ApJzUktKUpMTi1S0AgoqdRU8ClJ4XLNTczMUUgHq3MogavQ
S87Xq0oEabFS0DAwMtRUMDEy0TW3tDDgck7NAQoaWBjrmhqb6RqbGJhzAQA=";

			byte[] bytes = Convert.FromBase64String (test);
			Console.Write ("Converted: " + bytes.Length + " bytes.");

I get: Converted: 98 bytes.

I don't know the .Net mail classes so well, but there must be a way to get hold of the attachment's (the Base64 encoded data) and then you can decode it easily.

We can chat again tomorrow.
Jacques