BUILDING C++/CLI PROGRAMS in Visual C#

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CHAPTER 3 BUILDING C++/CLI PROGRAMS
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IL_000c: stfld string RefType::classname IL_0011: ret } // end of method RefType::.ctor .method public hidebysig instance string GetMessage() cil managed { // Code size 32 (0x20) .maxstack 2 .locals init (string V_0, object[] V_1) IL_0000: ldc.i4.0 IL_0001: newarr [mscorlib]System.Object IL_0006: stloc.1 IL_0007: ldstr "I am a {0}" IL_000c: ldarg.0 IL_000d: ldfld string RefType::classname IL_0012: call string [mscorlib]System.String::Concat(string, string) IL_0017: ldloc.1 IL_0018: call string [mscorlib]System.String::Format(string, object[]) IL_001d: stloc.0 IL_001e: ldloc.0 IL_001f: ret } // end of method RefType::GetMessage } // end of class RefType
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// ============================================================= // *********** DISASSEMBLY COMPLETE *********************** You can see the generated Intermediate Language code for your RefType class, GetMessage method, the main method, and some metadata. You might want to read and understand this Intermediate Language. Even if you don t, you ll want to be able to use ILDasm.exe to view the classes and symbols defined in a particular assembly, and to examine the information in the manifest. You might try the same thing except instead of specifying /clr:safe, use just /clr or /clr:pure. You ll notice a whole lot of other types and variables in addition to what was there before. This is the C runtime initialization plumbing. Because the CRT is not available in safe mode, you don t get that when you compile with /clr:safe. Certain core classes of the .NET Framework are included in the assembly mscorlib.dll. There is not a direct correlation between namespaces and assemblies or DLL names. This can be confusing until you get used to it, since it s easy to forget. It s possible for members of a particular namespace to be distributed across many assemblies (DLLs).
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CHAPTER 3 BUILDING C++/CLI PROGRAMS
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The #using Directive
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Like the classic C++ #include directive, the #using directive is used in a source code file to refer to an assembly (usually a DLL) that defines programming elements that you want to use in your program. The act of putting a #using directive for a particular assembly in your code is called referencing the assembly. Once an assembly is referenced in this way, you ll be able to use any publicly exposed classes, interfaces, and other program elements defined in that assembly. The types in mscorlib.dll are referenced by default, so there is no need for the #using directive to reference anything in this assembly. If there s a question as to whether a particular type is in mscorlib.dll, use ILDasm.exe on mscorlib.dll (you can find mscorlib.dll in the .NET Framework installation folder). In mixed code, ways of accessing native libraries remain the same. If COM libraries are used, use the #import directive as you would normally. Header files are not used for referencing managed types outside of the assembly where they live, but the #include directive is still used to reference headers written in classic C++ and for intra-assembly code (for example, in a Visual Studio project). Types, assembly-level global functions, and other symbols are defined in assemblies and may or may not be accessible outside that assembly, depending on accessibility modifiers declared on the symbol. Accessibility modifiers are slightly different in C++/CLI, as you ll see in 6. For now just know that you can use public or private on types and assembly-global functions to control whether the program element is accessible to other assemblies or internal to the assembly. Listing 3-2 shows a typical use of the #using directive. The Windows Forms APIs are not in the mscorlib.dll assembly, so they must be referenced via the #using directive. The #using directive should not be confused with the using statement. The using namespace statement following this directive is optional, and merely allows us to avoid typing the fully qualified name System::Windows::Forms::MessageBox. Listing 3-2. Using the #using Directive // using_directive.cpp #using "System.Windows.Forms.dll" using namespace System::Windows::Forms; int main() { MessageBox::Show("Hello World!"); }
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