在VS.Net 平台下调用Win API 函数或Win32 DLL
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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.
应用示例:
FlashWindow
附录4: VB6.0中的数据类型
数据类型 |
存储空间大小 |
范围 |
Byte |
1 个字节 |
0 到 255 |
Boolean |
2 个字节 |
True 或 False |
Integer |
2 个字节 |
-32,768 到 32,767 |
Long |
4 个字节 |
-2,147,483,648 到 2,147,483,647 |
Single |
4 个字节 |
负数时从 -3.402823E38 到 -1.401298E-45;正数时从 1.401298E-45 到 3.402823E38 |
Double |
8 个字节 |
负数时从 -1.79769313486232E308 到 |
Currency |
8 个字节 |
从 -922,337,203,685,477.5808 到 922,337,203,685,477.5807 |
Decimal |
14 个字节 |
没有小数点时为 +/-79,228,162,514,264,337,593,543,950,335,而小数点右边有 28 位数时为 +/-7.9228162514264337593543950335;最小的非零值为 +/-0.0000000000000000000000000001 |
Date |
8 个字节 |
100 年 1 月 1 日 到 9999 年 12 月 31 日 |
Object |
4 个字节 |
任何 Object 引用 |
String |
10 字节加字符串长度 |
0 到大约 20 亿 |
String |
字符串长度 |
1 到大约 65,400 |
Variant |
16 个字节 |
任何数字值,最大可达 Double 的范围 |
Variant |
22 个字节加字符串长度 |
与变长 String 有相同的范围 |
用户自定义 |
所有元素所需数目 |
每个元素的范围与它本身的数据类型的范围相同。 |
附录5: VB.NET中的数据类型
Visual Basic 类型 |
公共语言运行库类型结构 |
名义存储分配 |
取值范围 |
Boolean |
System.Boolean |
2 个字节 |
True 或 False |
Byte |
System.Byte |
1 个字节 |
0 到 255(无符号)。 |
Char |
System.Char |
2 个字节 |
0 到 65535(无符号)。 |
Date |
System.DateTime |
8 个字节 |
0001 年 1 月 1 日凌晨 0:00:00 到 9999 年 12 月 31 日晚上 11:59:59。 |
Decimal |
System.Decimal |
16 个字节 |
0 到 +/-79,228,162,514,264,337,593,543,950,335 之间不带小数点的数; |
Double |
System.Double |
8 个字节 |
负值取值范围为 -1.79769313486231570E+308 到 -4.94065645841246544E-324;正值取值范围为 4.94065645841246544E-324 到 1.79769313486231570E+308。 |
Integer |
System.Int32 |
4 个字节 |
-2,147,483,648 到 2,147,483,647。 |
Long |
System.Int64 |
8 个字节 |
-9,223,372,036,854,775,808 到 9,223,372,036,854,775,807。 |
Short |
System.Int16 |
2 个字节 |
-32,768 到 32,767。 |
Object |
System.Object(类) |
4 个字节 |
任何类型都可以存储在 Object 类型的变量中。 |
Single |
System.Single |
4 个字节 |
负值取值范围为 -3.4028235E+38 到 -1.401298E-45;正值取值范围为 1.401298E-45 到 3.4028235E+38。 |
String |
System.String(类) |
取决于实现平台 |
0 到大约 20 亿个 Unicode 字符。 |
用户定义的类型 |
(从System.ValueType继承) |
取决于实现平台 |
结构中的每个成员都有由自身数据类型决定的取值范围,并与其他成员的取值范围无关。 |
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