在msdn上发现很好的实例，与大家共享！
enum调用实例：
// Unions.cs
using System;
using System.Runtime.InteropServices;
/*
union MYUNION
{
int i;
double d;
};
*/
[ StructLayout( LayoutKind.Explicit )]
public struct MyUnion
{
[ FieldOffset( 0 )]
public int i;
[ FieldOffset( 0 )]
public double d;
}
/*
union MYUNION2
{
int i;
char str[128];
};
*/
[ StructLayout( LayoutKind.Explicit, Size=128 )]
public struct MyUnion2_1
{
[ FieldOffset( 0 )]
public int i;
}
[ StructLayout( LayoutKind.Sequential )]
public struct MyUnion2_2
{
[ MarshalAs( UnmanagedType.ByValTStr, SizeConst=128 )]
public String str;
}
public class LibWrap
{
// void TestUnion(MYUNION u, int type)
[ DllImport( "..\\LIB\\PinvokeLib.dll" )]
public static extern void TestUnion( MyUnion u, int type );
// void TestUnion( MYUNION u, int type )
[ DllImport( "..\\LIB\\PinvokeLib.dll" )]
public static extern void TestUnion2( MyUnion2_1 u, int type );
// void TestUnion(MYUNION u, int type)
[ DllImport( "..\\LIB\\PinvokeLib.dll" )]
public static extern void TestUnion2( MyUnion2_2 u, int type );
}
public class App
{
public static void Main()
{
MyUnion mu = new MyUnion();
mu.i = 99;
LibWrap.TestUnion( mu, 1 );
mu.d = 99.99;
LibWrap.TestUnion( mu, 2 );
MyUnion2_1 mu2_1 = new MyUnion2_1();
mu2_1.i = 99;
LibWrap.TestUnion2( mu2_1, 1 );
MyUnion2_2 mu2_2 = new MyUnion2_2();
mu2_2.str = "*** string ***";
LibWrap.TestUnion2( mu2_2, 2 );
}
}struct调用实例：
// Structs.cs
using System;
using System.Runtime.InteropServices;
/*
typedef struct _MYPERSON
{
char* first;
char* last;
} MYPERSON, *LP_MYPERSON;
*/
[ StructLayout( LayoutKind.Sequential, CharSet=CharSet.Ansi )]
public struct MyPerson
{
public String first;
public String last;
}
/*
typedef struct _MYPERSON2
{
MYPERSON* person;
int age;
} MYPERSON2, *LP_MYPERSON2;
*/
[ StructLayout( LayoutKind.Sequential )]
public struct MyPerson2
{
public IntPtr person;
public int age;
}
/*
typedef struct _MYPERSON3
{
MYPERSON person;
int age;
} MYPERSON3;
*/
[ StructLayout( LayoutKind.Sequential )]
public struct MyPerson3
{
public MyPerson person;
public int age;
}
/*
typedef struct _MYARRAYSTRUCT
{
bool flag;
int vals[ 3 ];
} MYARRAYSTRUCT;
*/
[ StructLayout( LayoutKind.Sequential )]
public struct MyArrayStruct
{
public bool flag;
[ MarshalAs( UnmanagedType.ByValArray, SizeConst=3 )]
public int[] vals;
}
public class LibWrap
{
// int TestStructInStruct(MYPERSON2* pPerson2);
[ DllImport( "..\\LIB\\PinvokeLib.dll" )]
public static extern int TestStructInStruct( ref MyPerson2 person2 );
// void TestStructInStruct3(MYPERSON3 person3)
[ DllImport( "..\\LIB\\PinvokeLib.dll" )]
public static extern int TestStructInStruct3( MyPerson3 person3 );
// void TestArrayInStruct( MYARRAYSTRUCT* pStruct );
[ DllImport( "..\\LIB\\PinvokeLib.dll" )]
public static extern int TestArrayInStruct( ref MyArrayStruct myStruct );
}
public class App
{
public static void Main()
{
// ******************* structure with pointer to other structure ************
MyPerson personName;
personName.first = "Sue";
personName.last = "Black";
MyPerson2 personAll;
personAll.age = 30;
IntPtr buffer = Marshal.AllocCoTaskMem( Marshal.SizeOf( personName ));
Marshal.StructureToPtr( personName, buffer, false );
personAll.person = buffer;
Console.WriteLine( "\nPerson before call:" );
Console.WriteLine( "first = {0}, last = {1}, age = {2}",
personName.first, personName.last, personAll.age );
int res = LibWrap.TestStructInStruct( ref personAll );
MyPerson personRes =
(MyPerson)Marshal.PtrToStructure( personAll.person, typeof( MyPerson ));
Marshal.FreeCoTaskMem( buffer );
Console.WriteLine( "Person after call:" );
Console.WriteLine( "first = {0}, last = {1}, age = {2}",
personRes.first, personRes.last, personAll.age );
// ******************* structure with embedded structure ************
MyPerson3 person3 = new MyPerson3();
person3.person.first = "Marie";
person3.person.last = "Claire";
person3.age = 27;
LibWrap.TestStructInStruct3( person3 );
// ******************* structure with embedded array ************
MyArrayStruct myStruct = new MyArrayStruct();
myStruct.flag = false;
myStruct.vals = new int[ 3 ];
myStruct.vals[ 0 ] = 1;
myStruct.vals[ 1 ] = 4;
myStruct.vals[ 2 ] = 9;
Console.WriteLine( "\nStructure with array before call:" );
Console.WriteLine( myStruct.flag );
Console.WriteLine( "{0} {1} {2}", myStruct.vals[ 0 ],
myStruct.vals[ 1 ], myStruct.vals[ 2 ] );
LibWrap.TestArrayInStruct( ref myStruct );
Console.WriteLine( "\nStructure with array after call:" );
Console.WriteLine( myStruct.flag );
Console.WriteLine( "{0} {1} {2}", myStruct.vals[ 0 ],
myStruct.vals[ 1 ], myStruct.vals[ 2 ] );
}
}
其他的API，string，数组的调用实例：请下载:PlatformInvoke实例。