c#调用c++ dll的几种类型

http://www.sosuo8.com/article-2012/dllleixingzhuanhuan.htm

 

在合作开发时，C#时常需要调用C++DLL，当传递参数时时常遇到问题，尤其是传递和返回字符串是，现总结一下，分享给大家：
VC++中主要字符串类型为：LPSTR,LPCSTR, LPCTSTR, string, CString, LPCWSTR, LPWSTR等
但转为C#类型却不完全相同。
主要有如下几种转换：
将string转为IntPtr：IntPtr System.Runtime.InteropServices.Marshal.StringToCoTaskMemAuto(string)
将IntPtr转为string：string System.Runtime.InteropServices.MarshalPtrToStringAuto(IntPtr)

类型对照：
BSTR --------- StringBuilder
LPCTSTR --------- StringBuilder
LPCWSTR --------- IntPtr
handle---------IntPtr
hwnd-----------IntPtr
char *----------string
int * -----------ref int
int &-----------ref int
void *----------IntPtr
unsigned char *-----ref byte
Struct需要在C#里重新定义一个Struct
CallBack回调函数需要封装在一个委托里，delegate static extern int FunCallBack(string str);
注意在每个函数的前面加上public static extern +返回的数据类型,如果不加public ,函数默认为私有函数，调用就会出错。

API数据类型	类型描述	C#类型
WORD	16位无符号整数	ushort
LONG	32位无符号整数	int
DWORD	32位无符号整数	uint
HANDLE	句柄,32位整数	int
UINT	32位无符号整数	uint
BOOL	32位布尔型整数	bool
LPSTR	指向字符的32位指针	string
LPCSTR	指向常字符的32位指针	String
BYTE	字节	byte
CHAR	字符	char
DWORDLONG	64位长整数	long
HDC	设备描述表句柄	int
HGDIOBJ	GDI对象句柄	int
HINSTANCE	实例句柄	int
HWM	窗口句柄	int
HPARAM	32位消息参数	int
LPARAM	32位消息参数	int
WPARAM	32位消息参数	int

   

   

API	C#数据类型
BOOL	System.Int32
BOOLEAN	System.Int32
BYTE	System.UInt16
CHAR	System.Int16
COLORREF	System.UInt32
DWORD	System.UInt32
DWORD32	System.UInt32
DWORD64	System.UInt64
FLOAT	System.Float
HACCEL	System.IntPtr
HANDLE	System.IntPtr
HBITMAP	System.IntPtr
HBRUSH	System.IntPtr
HCONV	System.IntPtr
HCONVLIST	System.IntPtr
HCURSOR	System.IntPtr
HDC	System.IntPtr
HDDEDATA	System.IntPtr
HDESK	System.IntPtr
HDROP	System.IntPtr
HDWP	System.IntPtr
HENHMETAFILE	System.IntPtr
HFILE	System.IntPtr
HFONT	System.IntPtr
HGDIOBJ	System.IntPtr
HGLOBAL	System.IntPtr
HHOOK	System.IntPtr
HICON	System.IntPtr
HIMAGELIST	System.IntPtr
HIMC	System.IntPtr
HINSTANCE	System.IntPtr
HKEY	System.IntPtr
HLOCAL	System.IntPtr
HMENU	System.IntPtr
HMETAFILE	System.IntPtr
HMODULE	System.IntPtr
HMONITOR	System.IntPtr
HPALETTE	System.IntPtr
HPEN	System.IntPtr
HRGN	System.IntPtr
HRSRC	System.IntPtr
HSZ	System.IntPtr
HWINSTA	System.IntPtr
HWND	System.IntPtr
INT	System.Int32
INT32	System.Int32
INT64	System.Int64
LONG	System.Int32
LONG32	System.Int32
LONG64	System.Int64
LONGLONG	System.Int64
LPARAM	System.IntPtr
LPBOOL	System.Int16[]
LPBYTE	System.UInt16[]
LPCOLORREF	System.UInt32[]
LPCSTR	System.String
LPCTSTR	System.String
LPCVOID	System.UInt32
LPCWSTR	System.String
LPDWORD	System.UInt32[]
LPHANDLE	System.UInt32
LPINT	System.Int32[]
LPLONG	System.Int32[]
LPSTR	System.String
LPTSTR	System.String
LPVOID	System.UInt32
LPWORD	System.Int32[]
LPWSTR	System.String
LRESULT	System.IntPtr
PBOOL	System.Int16[]
PBOOLEAN	System.Int16[]
PBYTE	System.UInt16[]
PCHAR	System.Char[]
PCSTR	System.String
PCTSTR	System.String
PCWCH	System.UInt32
PCWSTR	System.UInt32
PDWORD	System.Int32[]
PFLOAT	System.Float[]
PHANDLE	System.UInt32
PHKEY	System.UInt32
PINT	System.Int32[]
PLCID	System.UInt32
PLONG	System.Int32[]
PLUID	System.UInt32
PSHORT	System.Int16[]
PSTR	System.String
PTBYTE	System.Char[]
PTCHAR	System.Char[]
PTSTR	System.String
PUCHAR	System.Char[]
PUINT	System.UInt32[]
PULONG	System.UInt32[]
PUSHORT	System.UInt16[]
PVOID	System.UInt32
PWCHAR	System.Char[]
PWORD	System.Int16[]
PWSTR	System.String
REGSAM	System.UInt32
SC_HANDLE	System.IntPtr
SC_LOCK	System.IntPtr
SHORT	System.Int16
SIZE_T	System.UInt32
SSIZE_	System.UInt32
TBYTE	System.Char
TCHAR	System.Char
UCHAR	System.Byte
UINT	System.UInt32
UINT32	System.UInt32
UINT64	System.UInt64
ULONG	System.UInt32
ULONG32	System.UInt32
ULONG64	System.UInt64
ULONGLONG	System.UInt64
USHORT	System.UInt16
WORD	System.Short
WPARAM	System.IntPtr