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VB.net,Asp.net,C#,Java,Oracle,MS Sqlserver,PHP,WAP,XML,EJB,Java Beans,\nProgramming tips,Word,Excel, Access,Mobile Technology,Database programming,Client Server,linux,unix,windows,computer solutionsExplore the Problem Steps Recorder in Windows 7
31 January 2009 08:23:55
If you’ve ever worked a Help Desk and become extremely frustrated while trying to coax an end user into accurately describing the problem they are encountering, you are going to love a new tool in Microsoft Windows 7 called the Problem Steps Recorder. When started, this new tool will essentially record each and every step a user takes and document the entire operation in both screen captures and step-by-step details. When stopped, the Problem Steps Recorder will save the recorded information as a compiled HTML file and package it up in a ZIP file that the end user can then e-mail to the Help Desk.In this issue of the Windows Vista and Windows 7 Report, I’ll introduce you to Windows 7’s Problem Steps Recorder. Launching the toolAt this point in the beta, finding the Problem Steps Recorder is a bit tricky if you didn’t know that it existed as it really does not have a prominent access point. That may change as the UI matures a bit, but then again, it may remain hidden until needed-such as when a Help Desk tech tells the user to run it.In any case, you can launch the Problem Steps Recorder in the beta by typing PSR in the Start menu’s Search box and pressing [Enter]. However, I also located it in the Control Panel by searching with the keyword “Problem”,
Use Process.Start to open files in their native applications
24 December 2008 00:26:43
Use Process.Start to open files in their native applicationsDim ps As System.Diagnostics.Processps = Process.Start("C:\dhad.pdf")orps = Process.Start("C:\text.txt")to open Internet explorer Using Vb.netDim ps As System.Diagnostics.Process'to openps = Process.Start("IEXPLORE.EXE")'to kill ps.kill()
C# Tutorial For Beginners - Fourth tutorial
22 December 2008 02:24:49
Fourth tutorial Congratulation you would soon be able to hack CsGL but there is one last step you should understand : interop (with C code).You will need a C compiler, I advise gcc for windows called MinGW, it's free, it's good, it's GCC!We will create 3 file:echo.c #include #define DLLOBJECT __declspec(dllexport)DLLOBJECT void writeln(char* s){printf("%s\n", s);}echo.cs using System;using System.Runtime.InteropServices;namespace HelloUtil{public class Echo{[DllImport("echo.native.dll", CallingConvention=CallingConvention.Cdecl)]static extern void writeln(string s);string myString;public Echo(string aString){myString = aString;}public void Tell(){writeln(myString);}}}hello.cs using System;using HelloUtil;public class Hello{public static void Main(){Echo h = new Echo("Hello my 1st interop code !");h.Tell();}}Hehe, here you discover a completly new thing, Attribute."[DllImport(.." is an attribute.You could tag any method/field/class with any number of attribute.They generate extra information that could be used by anyone who could understand them.This DllImport attribute is understand by the compiler and told him that the function below is in fact in a DLL whose name is "echo.native.dll". I add a calling convention parameter as the default .NET calling convention is __stdcall whereas, in C, it's __cdecl.By the way, if you look for DllImport in the documentation, look for DllImportAttribute, because you remove "Attribute" to attribute classname when using them, it's like this.And now let's compile this! > csc /nologo /t:library /out:echo.dll echo.cs> csc /nologo /out:hello.exe /r:echo.dll hello.cs>> rem "if the following line don't work, read bellow.."> gcc -shared -o echo.native.dll echo.c> strip echo.native.dllthe 2 last line (the gcc & strip command) are for building the "C-DLL".If they don't work maybe gcc is not in a directory listed in your path environment variable ? check with: %lt; echo %PATH%Well it's probably not,anyway, so type, assumin mingc is in C:\MinGW: set PATH=C:\MinGW;%PATH%And try again... you sure it's not a syntax error ?If it compile test it now: helloGreat isn't it ?Now I should admit I didn't tell you all the truth. echo.dll and echo.native.dll are not the same kind of DLL. It's not just the language (C / C#) the C one is a plain executable full of, probably, x86 instruction, whereas the C# one is what MS call a portable executable.. anyway they are different.If you install echo.dll in the GAC it wont work because it won't find echo.native.dll except if you put in into the PATH (like C:\Windows\System32).In the same manner when you add the reference in VS.NET echo.native.dll is overlooked and your program won't work....So either put the native one in your path or copy it in the debug/release directory of VS.NET.Or do everything by hand (makefile? build.bat?) and put all your dll in you build directory, and everything work fine..
C# Tutorial For Beginners- First tutorial
22 December 2008 02:24:03
You should first open a DOS command shell. (If you don't know what it is, clic on the Start menu then run (at the bottom) and type, in the text field: "cmd".exercise: there is an easiest way to do that, try to find it.) You should begin to work in an empty directory for this. let call it "C:\learncs". Type in the shell: > md C:\learncs> cd C:\learncs> C:Now you should create your first C# program, type "notepad hello.cs" and type (in the notepad) using System;public class Hello{public static void Main(){Console.WriteLine("Hello C# World :-)");}}the using keyword just let you write Console at line 7, instead of System.Console. It's very usefull shortcut when you use a lot of "class" define in System.Save the file.Now you could compile. Type in the DOS Shell again and type: csc /nologo /out:hello.exe hello.csYou probaly have some errors, correct them, compile again, and now you have a working hello.exe program... type hello, see...
C# Tutorial For Beginners - Third tutorial
22 December 2008 02:21:38
Third tutorialNow you become to be pretty confident, I guess, so we could start using multiple file, and even a dll ? go into an other directory (or stay in this one, I won't mind) and create 2 file:hello.cs using System;public class Hello{public static void Main(){HelloUtil.Echo h = new HelloUtil.Echo("Hello my 1st C# object !");h.Tell();}}echo.cs using System;namespace HelloUtil{public class Echo{string myString;public Echo(string aString){myString = aString;}public void Tell(){Console.WriteLine(myString);}}}Note in hello.cs I have used the syntax "HelloUtil.Echo" it's because Echo is in the namespace HelloUtil, you could have typed (at he start of the file) using HelloUtil and avoid HelloUtil., that's the way namespace work.Now you could compile both in one .exe with > csc /nologo /out:hello.exe *.csBut it's not my intention, no.Well.(Have you tried?)Let's go building a DLL: > csc /nologo /t:library /out:echo.dll echo.csthat's it (dir will confirm).Now we could use it ... > csc /out:hello.exe /r:echo.dll hello.cs if you typed "hello" it will worked as usual..., but if you delete "echo.dll" the program will now crash: it use the DLL. You could also change Echo.cs, rebuild the DLL and see... that's the advantage of DLL!You could also put your DLL in the global assembly cache (GAC), and any program would be able to access it, even if the DLL is not in its directory! to put it in the GAC, I sugest you read MS doc but here are the unexplained step:create your assembly key, create it once and use it for every version. you create it with: sn -k myKeyName.snkthe .snk file should be in your compilation directory (the one where your run csc)create a strong asssembly title by adding in any .cs source file the following directive at top level: using System.Reflection;using System.Runtime.CompilerServices;[assembly: AssemblyTitle("My Lib Title")][assembly: AssemblyVersion("1.2.3.4")][assembly: AssemblyKeyFile("myKeyName.snk")]now add it to the GAC: > gacutil.exe /if myLib.dllBy the way, did I tell you ? when I referenced the hello.dll while compiling, remember? csc /out:hello.exe /r:echo.dll hello.cs, it could have been any assembly, even a .exe !!!
C# Tutorial For Beginners Second tutorial
22 December 2008 02:20:39
Second tutorial Congratulation you've done the most difficult, let increase the difficulty. and create an object instance. in the DOS shell create a new directory: > md ..\learncs2> cd ..\learncs2> notepad hello.csand then type, in the notepad using System;public class Echo{string myString;public Echo(string aString){myString = aString;}public void Tell(){Console.WriteLine(myString);}}public class Hello{public static void Main(){Echo h = new Echo("Hello my 1st C# object !");h.Tell();}}Wouah, 25 lines! That's a program! Save it, compile it, run it...What happened? csc look for a Main() function in your program, it should find one (and only one) and it will be the entry point of your program.In this tutorial we create 2 classes: Echo & Hello. In the Main() method you create an Echo object (an instance of the Echo class) with the keyword newThen we called the instance method "Tell()".the upper case letter on class or Method is just a MS convention, do as it pleased you.public is a visibility access, method wich are not public could not be seen from outside, there is also other visibility keywords, to learn more, clic on Start menu-> Programs -> Microsoft .NET Framework SDK -> Documentation there is a search window, an index window, etc... try to learn more about public private protected.
How to: Determine the User's Domain
16 December 2008 02:39:32
You can use the My.User object to get information about the current user. This example shows how to use the My.User.Name property to get the user's domain name if the application uses Windows authentication.Because the application uses Windows authentication by default, My.User returns the Windows information about the user who started the application.ExampleThis example checks if the application uses Windows authentication before parsing the My.User.Name property to determine the domain name.This example returns an empty string if the application uses custom authentication, because an implementation of custom authentication does not necessarily provide domain information.Function GetUserDomain() As StringIf TypeOf My.User.CurrentPrincipal Is _Security.Principal.WindowsPrincipal Then' My.User is using Windows authentication.' The name format is DOMAIN\USERNAME.Dim parts() As String = Split(My.User.Name, "\")Dim domain As String = parts(0)Return domainElse' My.User is using custom authentication.Return ""End IfEnd FunctionSource : http://msdn.microsoft.com/en-us/library/ztz70aw9(VS.80).aspx
How to: Determine if a User is in a Group
16 December 2008 02:37:19
You can use the My.User object to get information about the current user. This example shows how to use the My.User.IsInRole method to determine if the user is a member of a particular group.ExampleThis example uses the My.User.IsInRole method to determine if the user is an administrator before accessing a resource.If My.User.IsInRole( _ApplicationServices.BuiltInRole.Administrator) Then' Insert code to access a resource here.End If
How to: Determine a User's Login Name
16 December 2008 02:36:38
You can use the My.User object to get information about the current user. This example shows how to use the My.User.Name property to get the user's login name. An application uses Windows authentication by default, so the My.User returns the Windows information about the user who started the application.ExampleThis example checks if the application uses Windows or custom authentication, and then uses that information to parse the My.User.Name property.Function GetUserName() As StringIf TypeOf My.User.CurrentPrincipal Is _Security.Principal.WindowsPrincipal Then' The application is using Windows authentication.' The name format is DOMAIN\USERNAME.Dim parts() As String = Split(My.User.Name, "\")Dim username As String = parts(1)Return usernameElse' The application is using custom authentication.Return My.User.NameEnd IfEnd Function
How to Use the LIKE Operator in Parameter Queries
16 December 2008 02:34:11
An easy way to search for records that begin with a certain letter is to create a parameter query that prompts for a character to search for. You can use the LIKE operator with the wildcard character (*) to accomplish this task. This example uses the Employees table in the sample database Northwind.mdb.Method to Create Parameter Query Using the LIKE Operator1) Create a new query based on the Employees table.2) Drag LastName to the Field row and then type the following line in the Criteria row for the LastName field:LIKE [Enter the first char to search by: ] & "*"-or-LIKE "*" & [Enter any char to search by: ] & "*"NOTE: The Parameters dialog box is a fixed width so all the characters that you type may not display. 3) When you run this query, you will be prompted with the message that you specified in the LIKE statement. The first LIKE statement finds all the last names that begin with the letter that you type into the parameter prompt. For example, to find records where the last name starts with a "L", type L and begin the search. The second LIKE statement finds all the last names that have the letter that you type into the parameter prompt anywhere in the field. For example, to find records where the last name has a "L" anywhere in the field, type L and begin the search.
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