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LayoutKind 枚举: 控制当导出到非托管代码时对象的布局。
成员:
成员名称 |
说明 |
Auto |
运行库自动为非托管内存中的对象的成员选择适当的布局。使用此枚举成员定义的对象不能在托管代码的外部公开。尝试这样做将引发异常。 |
Explicit |
对象的各个成员在非托管内存中的精确位置被显式控制。每个成员必须使用 FieldOffsetAttribute 指示该字段在类型中的位置。 |
Sequential |
对象的成员按照它们在被导出到非托管内存时出现的顺序依次布局。这些成员根据在 StructLayoutAttribute.Pack 中指定的封装进行布局,并且可以是不连续的。 |
备注
此枚举与 StructLayoutAttribute 一起使用。默认情况下,公共语言运行库将使用 Auto 布局值。为减少与 Auto 值关联的布局相关问题,C#、Visual Basic 和 C++ 编译器为值类型指定了 Sequential 布局。
示例:参数中有回调函数的WINAPI 函数在托管环境中的调用
(其中createThread (…) 函数中第三个参数就需要调用自定义的WINAPI 函数)
//非托管函数的托管调用声明
[StructLayout(LayoutKind.Sequential)] //在本例中没有用到它.
public struct SECURITY_ATTRIBUTES
{
uint nLength;
IntPtr lpSecurityDescriptor;
UInt32 bInheritHandle;
} ;
[DllImport("Kernel32.dll", CharSet = CharSet.Auto)]
public static extern IntPtr CreateEvent(IntPtr lpEventAttributes, Boolean bManualReset, Boolean bInitialState, [MarshalAs(UnmanagedType.LPStr)] String lpName);
[DllImport("kernel32")]
public static extern IntPtr CreateThread(
IntPtr lpThreadAttributes,
uint dwStackSize,
ThreadProc lpStartAddress, // ThreadProc as friendly delegate
IntPtr lpParameter,
uint dwCreationFlags,
out uint dwThreadId);
//函数原型可参看msdn
定义:自定义WINAPI函数在托管环境下的声明
//stdcall //c++中的 自定义的WINAPI 函数: DWORD WINAPI Fun1Proc(LPVOID lpParameter)
static int Fun1Proc(IntPtr lpParameter)
{
MessageBox.Show ("thread is running");
return 0;
}
// Thread proc, to be used with Create*Thread
public delegate int ThreadProc(IntPtr param);
//使用:
using DWORD =System.Int32 ;
using WORD =System.Int16 ;
using HANDLE = System.IntPtr;
using HWND = System.IntPtr;
using HDC = System.IntPtr;
using PVOID = System.IntPtr;
using LPVOID = System.IntPtr;
HANDLE hThread=IntPtr.Zero;
uint x = 0;
ThreadProc proc = new ThreadProc(Fun1Proc);
hThread = CreateThread(
IntPtr.Zero,
0,
proc, hEvent,
0, // flags
out x);
WaitForSingleObject (hThread,unchecked((uint)-1));
CloseHandle (hThread);
MessageBox.Show ( "main thread is running" );
//CreateEvent 函数原型
//CreateEvent, Win API, as implemented in kernel32.dll:
HANDLE CreateEvent(
LPSECURITY_ATTRIBUTES lpEventAttributes,
BOOL bManualReset,
BOOL bInitialState,
LPCTSTR lpName
);
//WINAPI 函数在托管环境下的声明示例
[DllImport("kernel32.dll, SetLastError=true ")]
static extern IntPtr CreateEvent(IntPtr lpEventAttributes,
bool bManualReset, bool bInitialState,
[MarshalAs(UnmanagedType.LPStr) string lpName);
VB.NET
Declare Function FormatMessage Lib "kernel32" Alias "FormatMessageA"(_
ByVal dwFlags As Integer, ByRef lpSource As Object, _
ByVal dwMessageId As Integer, ByVal dwLanguageId As Integer, _
ByVal lpBuffer As String, ByVal nSize As Integer, _
ByRef Arguments As Integer) As Integer
C# definition
[DllImport("kernel32.dll", SetLastError=true)]
static extern int FormatMessageA ( int dwFlags, ref object lpSource,
int dwMessageId, int dwLanguageId, string lpBuffer,
int nSize, ref int Arguments)
Managed C++. NET
[DllImport("KERNEL32.DLL",EntryPoint="MoveFileW",
SetLastError=true,CharSet=CharSet::Unicode,ExactSpelling=true,
CallingConvention=CallingConvention::StdCall)]
static bool MoveFile( String^ src, String^ dst );
更为详细的介绍请看:
WIN API查看器
http://www.codeproject.com/csharp/APIBrowser.asp
<<A Closer Look at Platform Invoke>>
<<Marshaling Data with Platform Invoke>>
附录1:Windows Data Type 与 .NET Data Type 的对应关系
Windows Data Type |
.NET Data Type |
BOOL, BOOLEAN |
Boolean or Int32 |
BSTR |
String |
BYTE |
Byte |
CHAR |
Char |
DOUBLE |
Double |
DWORD |
Int32 or UInt32 |
FLOAT |
Single |
HANDLE (and all other handle types, such as HFONT and HMENU) |
IntPtr, UintPtr or HandleRef |
HRESULT |
Int32 or UInt32 |
INT |
Int32 |
LANGID |
Int16 or UInt16 |
LCID |
Int32 or UInt32 |
LONG |
Int32 |
LPARAM |
IntPtr, UintPtr or Object |
LPCSTR |
String |
LPCTSTR |
String |
LPCWSTR |
String |
LPSTR |
String or StringBuilder* |
LPTSTR |
String or StringBuilder |
LPWSTR |
String or StringBuilder |
LPVOID |
IntPtr, UintPtr or Object |
LRESULT |
IntPtr |
SAFEARRAY |
.NET array type |
SHORT |
Int16 |
TCHAR |
Char |
UCHAR |
SByte |
UINT |
Int32 or UInt32 |
ULONG |
Int32 or UInt32 |
VARIANT |
Object |
VARIANT_BOOL |
Boolean |
WCHAR |
Char |
WORD |
Int16 or UInt16 |
WPARAM |
IntPtr, UintPtr or Object |
附录2: 托管数据类型与非托管数据类型对比表
Unmanaged type in Wtypes.h |
Unmanaged C language type |
Managed class name |
Description |
HANDLE |
void* |
32 bits |
|
BYTE |
unsigned char |
8 bits |
|
SHORT |
short |
16 bits |
|
WORD |
unsigned short |
16 bits |
|
INT |
int |
32 bits |
|
UINT |
unsigned int |
32 bits |
|
LONG |
long |
32 bits |
|
BOOL |
long |
32 bits |
|
DWORD |
unsigned long |
32 bits |
|
ULONG |
unsigned long |
32 bits |
|
CHAR |
char |
Decorate with ANSI. |
|
LPSTR |
char* |
Decorate with ANSI. |
|
LPCSTR |
Const char* |
Decorate with ANSI. |
|
LPWSTR |
wchar_t* |
Decorate with Unicode. |
|
LPCWSTR |
Const wchar_t* |
Decorate with Unicode. |
|
FLOAT |
Float |
32 bits |
|
DOUBLE |
Double |
64 bits |
附录3: C/C++与C#的数据类型对应关系
C/C++ |
C# |
HANDLE, LPDWORD, LPVOID, void* |
IntPtr |
LPCTSTR, LPCTSTR, LPSTR, char*, const char*, Wchar_t*, LPWSTR |
String [in], StringBuilder [in, out] |
DWORD, unsigned long, Ulong |
UInt32, [MarshalAs(UnmanagedType.U4)] |
bool |
bool |
LP<struct> |
[In] ref <struct> |
SIZE_T |
uint |
LPDWORD |
out uint |
LPTSTR |
[Out] StringBuilder |
PULARGE_INTEGER |
out ulong |
WORD |
uInt16 |
Byte, unsigned char |
byte |
Short |
Int16 |
Long, int |
Int32 |
float |
single |
double |
double |
NULL pointer |
IntPtr.Zero |
Uint |
Uint32 |
当结构体中是一个数据类型指针时,采用.net对应的数据类型替换.
当结构体中的变量是另一个结构体的指针时,采用IntPtr类型来操作.
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