IT-SC book: Advanced CORBA Programming with C++ in Software

Generator ANSI/AIM Code 39 in Software IT-SC book: Advanced CORBA Programming with C++
IT-SC book: Advanced CORBA Programming with C++
Paint Code39 In C#.NET
Using Barcode creator for VS .NET Control to generate, create Code 39 Extended image in Visual Studio .NET applications.
The C++ mapping permits different IDL types to be mapped onto the same C++ type Specifically, IDL char, boolean, and octet can all map to the same C++ character type In addition, IDL wchar can map either to C++ wchar_t or to one of the C++ integer types This means that the mapping cannot overload the <= operator for these types because, at the C++ level, they may be the same single type
Generating USS Code 39 In Visual Studio .NET
Using Barcode generator for ASP.NET Control to generate, create Code 3/9 image in ASP.NET applications.
Insertion and Extraction of boolean, octet, and char
Encoding ANSI/AIM Code 39 In .NET
Using Barcode creator for Visual Studio .NET Control to generate, create Code-39 image in VS .NET applications.
In cases when more than one IDL type can map to the same C++ type, you insert a value into an Any using a helper type The purpose of the helper type is to correctly set the type code Here is an example:
Print Code 39 Extended In Visual Basic .NET
Using Barcode creator for VS .NET Control to generate, create Code 3/9 image in .NET applications.
CORBA::Any a; CORBA::Boolean CORBA::Char CORBA::Octet b = 0; c = 'x'; o = 0xff;
Recognizing UPC A In .NET
Using Barcode recognizer for VS .NET Control to read, scan read, scan image in VS .NET applications.
a <<= CORBA::Any::from_boolean(b); a <<= CORBA::Any::from_char(c); a <<= CORBA::Any::from_octet(o); a <<= b; a <<= c; a <<= o; // Wrong, compile-time error! // Wrong, compile-time error! // Wrong, compile-time error!
Generating Data Matrix 2d Barcode In VB.NET
Using Barcode maker for .NET Control to generate, create DataMatrix image in VS .NET applications.
As you can see from this example, you must use the CORBA::Any::from_type helpers to insert these values The example also shows that if you forget to use the helper types, you will get a compile-time error You must be careful, though, to use the correct helper type:
Bar Code Maker In C#
Using Barcode creation for .NET framework Control to generate, create bar code image in VS .NET applications.
CORBA::Any a; CORBA::Char c = 'x'; a <<= CORBA::Any::from_boolean(c);
Generate Bar Code In VS .NET
Using Barcode creator for ASP.NET Control to generate, create barcode image in ASP.NET applications.
// Oops, wrong helper!
Reading Code-128 In VS .NET
Using Barcode decoder for Visual Studio .NET Control to read, scan read, scan image in .NET applications.
This code compiles and runs on many ORBs, but it is wrong because it inserts the value of the character 'x' into the Any while setting the type code to indicate a Boolean To extract one of these values again, you must use the corresponding to_type helper:
EAN / UCC - 13 Generator In .NET
Using Barcode creator for .NET Control to generate, create EAN-13 image in .NET applications.
CORBA::Any CORBA::Boolean CORBA::Char CORBA::Octet if (a >>= // It } else if // It } else if // It a; b; c; o;
Bar Code Encoder In Visual Basic .NET
Using Barcode creation for Visual Studio .NET Control to generate, create barcode image in .NET framework applications.
CORBA::Any::to_boolean(b)) { contained a boolean, use b (a >>= CORBA::Any::to_char(c)) { contained a char, use c (a >>= CORBA::Any::to_octet(o)) { contained an octet , use o
Creating Code 128 Code Set A In VS .NET
Using Barcode drawer for .NET Control to generate, create ANSI/AIM Code 128 image in .NET applications.
IT-SC book: Advanced CORBA Programming with C++
UPC Symbol Printer In Java
Using Barcode drawer for Java Control to generate, create GS1 - 12 image in Java applications.
} else { // There is something else in the Any } a >>= b; a >>= c; a >>= o; // Compile-time error! // Compile-time error! // Compile-time error!
Generate Barcode In Java
Using Barcode creation for Java Control to generate, create bar code image in Java applications.
This code example shows that you can use the return value of the extraction operator to test whether extraction succeeded It also illustrates that if you forget to use a helper type and try to extract directly, you will get a compile-time error As with insertion, you must be careful to use the correct helper:
Generate Bar Code In VS .NET
Using Barcode drawer for .NET framework Control to generate, create bar code image in Visual Studio .NET applications.
CORBA::Any a = ; CORBA::Char c; a >>= CORBA::Any::to_boolean(c);
Scan ECC200 In VS .NET
Using Barcode decoder for VS .NET Control to read, scan read, scan image in .NET framework applications.
// Oops, wrong helper!
ECC200 Drawer In Visual Studio .NET
Using Barcode generation for ASP.NET Control to generate, create DataMatrix image in ASP.NET applications.
This code may compile on your ORB but has undefined behavior because the wrong helper is used here
Print UPC - 13 In Java
Using Barcode creation for Java Control to generate, create European Article Number 13 image in Java applications.
Insertion and Extraction of Wide Characters
Code 128B Printer In Visual C#
Using Barcode encoder for .NET Control to generate, create Code 128C image in Visual Studio .NET applications.
To insert a wide character into an Any, you also must use a helper type:
Generate Data Matrix 2d Barcode In C#.NET
Using Barcode generator for .NET framework Control to generate, create Data Matrix image in .NET applications.
CORBA::Any a; CORBA::WChar wc = L'x'; a <<= CORBA::Any::from_wchar(wc);
You must use the from_wchar helper type to correctly insert wide characters Depending on the environment, the following code may or may not compile, but, if it does compile, it has undefined behavior:
CORBA::Any a; CORBA::WChar wc = L'x'; a <<= wc;
// Undefined behavior
In a non-standard C++ environment, in which wchar_t is an alias for an integer type, this code will compile but will incorrectly set the type code to indicate an integer type In a standard C++ environment, the insertion may do the right thing, or it may incorrectly set the type code to an integer type or cause a compilation error (Unfortunately, the C++ mapping cannot guarantee a compile-time error for this mistake because of the need to support non-standard compilers) Extraction is similar to insertion:
CORBA::Any a = ; CORBA::WChar wc;
IT-SC book: Advanced CORBA Programming with C++
if (a >>= CORBA::Any::to_wchar(wc)) { // OK, we have a wide character }
As with insertion, you must use the to_wchar helper type Otherwise, the behavior is undefined 1534 Insertion and Extraction of Unbounded Strings You have seen that unbounded strings are inserted using the normal insertion operator: