itextsharp barcode vb net s COMPLETING THE FRAMEWORK in visual basic.net

Maker pdf417 in visual basic.net s COMPLETING THE FRAMEWORK

Craig Murphy (MVP and developer community organizer)

As you can see, in order to use P/Invoke with class functions, whether static or nonstatic, you need the obfuscated names, which we obtain by running dumpbin.exe or link.exe /DUMP /EXPORTS as explained in the code comments. The static functions do not require a special calling convention, since they use the __cdecl calling convention. The member function F required the __thiscall calling convention, because the implicit parameter for any member function is a pointer to the object. The declaration of the P/Invoke function creates a managed name for the native function, as well as a small piece of code that in turn calls the native function. This piece of code is called a managed entry point to a native function, and it involves what is called a context switch between managed and native code. This is also called a managed to native transition or vice versa. Context switches add overhead to the function call. During a context switch, parameters are marshaled between native and managed types. The penalty is incurred again when the context switches back to managed code. You might say that execution is detained at the border for a time when crossing between managed and native code.

class Program { static void Main() // Main { MyData data = new MyData(); data.SetData( 5 ); Console.WriteLine("Value = {0}", data.GetData()); } } This code produces the following output:

a new SpriteBatch object for each frame; rather, reuse one SpriteBatch object you created at the startup of your application.

Vertices are used to store data you send from your XNA project to the shaders on your graphics card. A vertex format contains a description of the data stored in your vertices. The XNA Framework comes with some default vertex formats, ranging from the simple VertexPositionColor to the VertexPostionNormalTexture format. However, if you need to pack each vertex with some extra data, such as the tangent or some timing data, you need to define your custom vertex format. This is required if you need this data in the vertex shader. Therefore, you will need to define a custom vertex format only when coding custom vertex and pixel shaders.

Suffixes are not case sensitive, but the convention is to use uppercase characters so that the letter L is not mistaken for the numeral 1. Compiling and running the code in Listing 5-2 produces the following results: Value: 23 - Type: System.Int64 Value: 2500000000 - Type: System.UInt64 Value: 2017.2 - Type: System.Decimal Press enter to finish By far the most common use of literal suffixes is when using real numbers. By default, literals that contain a decimal point are inferred to the double type, for which there is no implicit conversion to the float type. The following statement will generate a compiler error:

As you might expect, the first step is to create a new Visual Studio 2010 project. Select the Windows Forms Application template from the list, and call the project DataApp. The project will be created and open a design surface containing the main window for our program, just as with the previous example.

This shows the three dump (trace) destinations. The background dump destination is used by any server process (see 5, Oracle Processes, for a comprehensive list of Oracle background processes and their functions). The core dump destination is used for a core dump (very detailed process diagnostic information) when a serious problem arises, i.e., a process crash. The user dump destination is used by dedicated servers (covered in 2 Architecture Overview ) when they generate a trace file. To continue with the various methods of examining these dump destinations, let s take a look at the V$ tables available: ops$tkyte%ORA11GR2> select name, value 2 from v$parameter 3 where name like "%dump_dest%"; NAME VALUE -------------------- ------------------------background_dump_dest /home/ora11gr2/app/ora11g r2/diag/rdbms/orcl/ora11g r2/trace user_dump_dest /home/ora11gr2/app/ora11g r2/diag/rdbms/orcl/ora11g r2/trace /home/ora11gr2/app/ora11g r2/diag/rdbms/orcl/ora11g r2/cdump

namespace 2.MEFInterfaces { public interface ILogger { string WriteToLog(string Message); } } 4. 5. In the 2.HelloMEF project, add a reference to the 2.MEFInterfaces project. In the 2.HelloMEF project, create a class called MoreUsefulMEF and enter the following code: using using using using using using using using System; System.Collections.Generic; System.Linq; System.Text; System.ComponentModel.Composition; System.ComponentModel.Composition.Hosting; System.Reflection; System.IO;