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Modules in CLR

Sep 3rd

Posted by nikhil in Components

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Basics

  • Packaging deploying and discovering components code in CLR is different from COM, Java or Win 32.
  • Programs written in CLR reside in module.
  • Module is byte stream typically stored as a file in the local file system or on a web server.

Format of CLR module

  • CLR module uses an extended version of PE/COFF executable file format used by Windows NT.
  • Due to use of PE/COFF format CLR modules are valid win 32 module that can be loaded using LoadLibrary() system call.
PECOFF

PECOFF

Generating modules at run time

  • use System.Reflection.Emit namespace
  • CodeDom: it gives higher level of abstraction removing need to know or understand CIL.

Types of modules

RAW, LIBRARY and EXECUTABLE are three types of modules. Let us go through each one in more details

RAW

  • By default this modules will use .netmodule file extension.
  • This module cannot be deployed by there own nor the CLR can load them directly.
  • This module need to be associated with full-fledged components i.e. assembly.
  • Usage of raw module
    • Multi-language assemblies
    • Separately maintained source files
    • Small download footprint
    • Link the same source files into multiple assemblies

LIBRARY

  • By default, this module will use .dll file extension.
  • This module contains additional Meta data that allows deploying it as stand-alone code.
  • This module cannot be launched as executable program from command shell or windows explorer.

EXECUTABLE

  • By default file extensions are .exe (use console UI sub-system) or .winexe (use GUI sub-system)
  • Must have initial entry point i.e. method that CLR will execute automatically when the program is launched.
    • This method should be static
    • This method does not need to declaration as public.
    • This method must inside type definition.
    • Name of type is immaterial.
    • If there are more than one type contains main method, you need to resolve it manually.

Reference

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WCF

Jul 6th

Posted by nikhil in WCF

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I was working on WCF. I found some video on MS. They are really good.
Here is the link

http://msdn.microsoft.com/en-us/netframework/first-steps-with-wcf.aspx

WinSock2 Client Server in VC++

Jul 6th

Posted by nikhil in Networking

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I was working with OpenSSL and VC++, I found that there are very few references available which tell us how to implement OpenSSL through VC++. But real thing missing  is Working Client server in VC++ which will communicate through OpenSSL. So Writing one

Lets start with WinSock2 client server.

VC++ Code details

  1. VS2005

VC++ references required:
(From MSDN)Use the Winsock API by including the Winsock 2 header files. The Winsock2.h header file contains most of the Winsock functions, structures, and definitions. The Ws2tcpip.h header file contains definitions introduced in the WinSock 2 Protocol-Specific Annex document for TCP/IP that includes newer functions and structures used to retrieve IP addresses.

  1. Add #include <winsock2.h> and #include <ws2tcpip.h> in code
  2. Add build environment links to the Winsock Library file WS2_32.lib

Source code : click this link WinSock2-BasicClientServer

WinSock2 Server

We need to follow following steps to implement Server

  1. Initialize Winsock.
  2. Create and Bind the socket.
  3. Listen on the socket for a client.
  4. Accept a connection from a client.
  5. Receive and send data.
  6. Disconnect.

WinSock2 Client

  1. Initialize Winsock.
  2. Create a socket.
  3. Connect to the server.
  4. Send and receive data.
  5. Disconnect.

This is working fine but no fun. Lets make it working in threads.

Net will be client server communicating with each other in different threads; like read thread and write threads.

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Small command to open windows share

Jun 18th

Posted by nikhil in system

1 comment

Command is “net use”. This will open the shared folder

net use \\10.70.0.177\software /user:doamin\nikhil

If this command is used with * it will map drive to shared folder.

net use * \\10.70.0.177\software /user:doamin\nikhil

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Crazy idea…

Jun 11th

Posted by nikhil in C#

1 comment

I am getting bored while working on daily ‘shit’. nothing really drives me. In office it work i do for last 2 year; so I know how to find solutions for problems. It is not very challenging coding part. So I got and crazy idea.

I will implement RFCs one by one in C# code.

I am choosing C# as this is easy to use and I want to do some heavy coding in C#. Lets see how this work out.

I am staring on http://www.rfc-editor.org/rfcxx00.html form top to bottom.

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Windows 7 RC1 Review for hp nx7400 laptop

May 29th

Posted by nikhil in Review

4 comments

I just installed windows 7 RC on my laptop.  This is review

Device drivers status

Hardware Working status
Display Working (Auto detected)
Dual Screens Working (Auto detected)
Sound Working (Auto detected)
LAN Broadcom 440x 10/100 Working (Auto detected)
WLAN Broadcom 110 Working (Auto detected)
Bluetooth Not Working by default.

GUI experience

GUI Very good
Speed of OS Very good
Networking Not very impressive
Backward GUI compatibility Bad

Overall rating 7.5/10

First week

1. Installed Software –Visual Studio 2008.
2. Not even single crash.
3. No lags.
4. Lot of Updates :( as this is RC this is acceptable.

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Building OpenSSL on Windows using Visual C++ (6.0)

May 13th

Posted by nikhil in OpenSSL

4 comments

Hi its all about building OpenSSL on Windows using Visual C++ (6.0)

Requirement,
Visual c++ 6.0
VC Service pack 5 (not a 6)
Visual C++ 6.0 Processor Pack
Active Perl

Pre build info :
Package(general source) : http://www.openssl.org/source/
Unpack to: C:\build\openssl
Installation folder: C:\www\openssl ( use command mkdir C:\www\openssl)
openssl.cnf location : C:\www\openssl\bin

Build:
1. cd /d C:\build\openssl2
2. perl Configure enable-camellia –openssldir=C:/www/openssl VC-WIN32
3. ms\do_masm
4. nmake -f ms\ntdll.mak

Test the build:
nmake -f ms\ntdll.mak test

Install:
nmake -f ms\ntdll.mak install

Add OpenSSL to the PATH:
Set PATH under Start » Settings » Control Panel » System » Advanced » Environment Variables » System variables
Add C:\www\openssl\bin in Path verialbe

Reboot the machine (for Environment Variables):
Test installation:
1. openssl version
2. openssl s_client -connect www.openssl.org:443
3. GET / HTTP/1.0 [Enter twice]

For more info visit http://www.devside.net/guides/windows/openssl

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Excellent article about .net remoting

Apr 28th

Posted by nikhil in C#

No comments

http://www.csharphelp.com/archives/archive157.html

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Get all database names form MSSQL 2005

Apr 9th

Posted by nikhil in C#

No comments

String conxString = “Data Source=” + server + “; Integrated Security=True;”;

using (System.Data.SqlClient.SqlConnection sqlConx = new System.Data.SqlClient.SqlConnection(conxString)) {
sqlConx.Open();
DataTable tblDatabases = sqlConx.GetSchema(“Databases”);
sqlConx.Close();

foreach (DataRow row in tblDatabases.Rows) {
Console.WriteLine(“Database: ” + row["database_name"]);
}
}

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Check given IP address is valid for given machine

Mar 24th

Posted by nikhil in C#

2 comments

Given code useDns.GetHostAddresses(). This function resolves machine host name to IP address. And if IP address is given it check for IP address and if valid returns given IP address.

  1. string machineName = "localhost";
  2. string checkIP = "127.0.0.1";
  3.  
  4. IPAddress[] ipsMachineName = null;
  5. IPAddress[] ipsCheckIP = null;
  6. //fetch IPs for machine
  7. try {
  8. ipsMachineName = Dns.GetHostAddresses(machineName);
  9. }
  10. catch (Exception expMachine) {
  11. Console.WriteLine(string.Format("Error while retriving IP address of machine ‘{0}’ : {1} ", machineName, expMachine.Message));
  12. return;
  13. }
  14. //Check IP addrss
  15. try {
  16. ipsCheckIP = Dns.GetHostAddresses(checkIP);
  17. }
  18. catch (Exception expIP) {
  19. Console.WriteLine(string.Format("Invalid IP address: {0}", expIP.Message));
  20. return;
  21. }
  22. //check ip address.
  23. bool validIPAddress = false;
  24. foreach (IPAddress machineIP in ipsMachineName) {
  25. foreach (IPAddress cIP in ipsCheckIP) {
  26. if (string.Compare(machineIP.ToString(), cIP.ToString(), true) == 0) {
  27. validIPAddress = true;
  28. break;
  29. }
  30. }
  31. if (validIPAddress) {
  32. break;
  33. }
  34. }
  35. if (validIPAddress) {
  36. Console.WriteLine("Valid IP address");
  37. }
  38. else {
  39. Console.WriteLine("Invalid IP address");
  40. }
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