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C# in a Nutshell
book

C# in a Nutshell

by Ben Albahari, Ted Neward, Peter Drayton
March 2002
Intermediate to advanced content levelIntermediate to advanced
864 pages
31h 8m
English
O'Reilly Media, Inc.
Content preview from C# in a Nutshell

Name

UnmanagedMarshal

Synopsis

This class defines how parameters or fields should be marshaled in function calls to unmanaged code. By default, the CLR applies certain format conversions automatically during this marshaling (for example, it might change a System.String object to an unmanaged BSTR). Use this class to override this default behavior.

To create an instance of this class, use one of the static methods to define the unmanaged type you want. Typically, you will use DefineUnmanagedMarshal() for this purpose, and specify the unmanaged type using the System.Runtime.InteropServices.UnmanagedType enumeration. Alternatively, use DefineByValTStr() to specify marshaling to a string in a fixed array buffer, and specify the other methods for various types of unmanaged arrays. These static methods all return a UnmanagedMarshal object, with its read-only properties set accordingly. Lastly, associate the UnmanagedMarshal with the appropriate type using the SetMarshal() method for the ParameterBuilder, MethodBuilder, or FieldBuilder class.

public sealed class UnmanagedMarshal {
// Public Instance Properties
   public field UnmanagedType BaseType{get; } 
   public field int ElementCount{get; } 
   public field UnmanagedType GetUnmanagedType{get; } 
   public field Guid IIDGuid{get; } 
// Public Static Methods
   public static method UnmanagedMarshal DefineByValArray(
        int elemCount);  
   public static method UnmanagedMarshal DefineByValTStr(
        int elemCount);  
   public static method UnmanagedMarshal DefineLPArray ...
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Publisher Resources

ISBN: 0596001819Catalog PageErrata