//C++中的DLL函数原型為
        //extern “C” __declspec(dllexport) bool 方法名一(const char* 变量名1, unsigned char* 变量名2)
        //extern “C” __declspec(dllexport) bool 方法名二(const unsigned char* 变量名1, char* 变量名2)
 

        //c++:HANDLE(void   *)          —-    c#:System.IntPtr 
        //c++:Byte(unsigned   char)     —-    c#:System.Byte 
        //c++:SHORT(short)              —-    c#:System.Int16 
        //c++:WORD(unsigned   short)    —-    c#:System.UInt16 
        //c++:INT(int)                  —-    c#:System.Int16
        //c++:INT(int)                  —-    c#:System.Int32 
        //c++:UINT(unsigned   int)      —-    c#:System.UInt16
        //c++:UINT(unsigned   int)      —-    c#:System.UInt32
        //c++:LONG(long)                —-    c#:System.Int32 
        //c++:ULONG(unsigned   long)    —-    c#:System.UInt32 
        //c++:DWORD(unsigned   long)    —-    c#:System.UInt32 
        //c++:DECIMAL                   —-    c#:System.Decimal 
        //c++:BOOL(long)                —-    c#:System.Boolean 
        //c++:CHAR(char)                —-    c#:System.Char 
        //c++:LPSTR(char   *)           —-    c#:System.String 
        //c++:LPWSTR(wchar_t   *)       —-    c#:System.String 
        //c++:LPCSTR(const   char   *)  —-    c#:System.String 
        //c++:LPCWSTR(const   wchar_t   *)      —-    c#:System.String 
        //c++:PCAHR(char   *)   —-    c#:System.String 
        //c++:BSTR              —-    c#:System.String 
        //c++:FLOAT(float)      —-    c#:System.Single 
        //c++:DOUBLE(double)    —-    c#:System.Double 
        //c++:VARIANT           —-    c#:System.Object 
        //c++:PBYTE(byte   *)   —-    c#:System.Byte[]
 
        //c++:BSTR      —-    c#:StringBuilder
        //c++:LPCTSTR   —-    c#:StringBuilder
        //c++:LPCTSTR   —-    c#:string
        //c++:LPTSTR    —-    c#:[MarshalAs(UnmanagedType.LPTStr)] string 
        //c++:LPTSTR 输出变量名    —-    c#:StringBuilder 输出变量名
        //c++:LPCWSTR   —-    c#:IntPtr
        //c++:BOOL      —-    c#:bool   
        //c++:HMODULE   —-    c#:IntPtr    
        //c++:HINSTANCE —-    c#:IntPtr 
        //c++:结构体    —-    c#:public struct 结构体{}; 
        //c++:结构体 **变量名   —-    c#:out 变量名   //C#中提前申明一个结构体实例化后的变量名
        //c++:结构体 &变量名    —-    c#:ref 结构体 变量名
                //c++:WORD      —-    c#:ushort
        //c++:DWORD     —-    c#:uint
        //c++:DWORD     —-    c#:int
 
        //c++:UCHAR     —-    c#:int
        //c++:UCHAR     —-    c#:byte
        //c++:UCHAR*    —-    c#:string
        //c++:UCHAR*    —-    c#:IntPtr
 
        //c++:GUID      —-    c#:Guid
        //c++:Handle    —-    c#:IntPtr
        //c++:HWND      —-    c#:IntPtr
        //c++:DWORD     —-    c#:int
        //c++:COLORREF  —-    c#:uint
 
        //c++:unsigned char     —-    c#:byte
        //c++:unsigned char *   —-    c#:ref byte
        //c++:unsigned char *   —-    c#:[MarshalAs(UnmanagedType.LPArray)] byte[]
        //c++:unsigned char *   —-    c#:[MarshalAs(UnmanagedType.LPArray)] Intptr
 
        //c++:unsigned char &   —-    c#:ref byte
        //c++:unsigned char 变量名      —-    c#:byte 变量名
        //c++:unsigned short 变量名     —-    c#:ushort 变量名
        //c++:unsigned int 变量名       —-    c#:uint 变量名
        //c++:unsigned long 变量名      —-    c#:ulong 变量名
 
        //c++:char 变量名       —-    c#:byte 变量名   //C++中一个字符用一个字节表示,C#中一个字符用两个字节表示
        //c++:char 数组名[数组大小]     —-    c#:MarshalAs(UnmanagedType.ByValTStr, SizeConst = 数组大小)]        public string 数组名; ushort
 
        //c++:char *            —-    c#:string       //传入参数
        //c++:char *            —-    c#:StringBuilder//传出参数
        //c++:char *变量名      —-    c#:ref string 变量名
        //c++:char *输入变量名  —-    c#:string 输入变量名
        //c++:char *输出变量名  —-    c#:[MarshalAs(UnmanagedType.LPStr)] StringBuilder 输出变量名
 
        //c++:char **           —-    c#:string
        //c++:char **变量名     —-    c#:ref string 变量名
        //c++:const char *      —-    c#:string
        //c++:char[]            —-    c#:string
        //c++:char 变量名[数组大小]     —-    c#:[MarshalAs(UnmanagedType.ByValTStr,SizeConst=数组大小)] public string 变量名;
     //c++:char* 变量名[]  —– c#:string[] 或者通过List<string>.ToArray()
     
        //c++:struct 结构体名 *变量名   —-    c#:ref 结构体名 变量名
        //c++:委托 变量名   —-    c#:委托 变量名
 
        //c++:int       —-    c#:int
        //c++:int       —-    c#:ref int
        //c++:int &     —-    c#:ref int
        //c++:int *     —-    c#:ref int      //C#中调用前需定义int 变量名 = 0;
        //c++:*int      —-    c#:IntPtr
        //c++:int32 PIPTR *     —-    c#:int32[]
        //c++:float PIPTR *     —-    c#:float[]
      
 
        //c++:double** 数组名          —-    c#:ref double 数组名
        //c++:double*[] 数组名          —-    c#:ref double 数组名
        //c++:long          —-    c#:int
        //c++:ulong         —-    c#:int
        
        //c++:UINT8 *       —-    c#:ref byte       //C#中调用前需定义byte 变量名 = new byte();      
 
 
        //c++:handle    —-    c#:IntPtr
        //c++:hwnd      —-    c#:IntPtr
        
        
        //c++:void *    —-    c#:IntPtr        
        //c++:void * user_obj_param    —-    c#:IntPtr user_obj_param
        //c++:void * 对象名称    —-    c#:([MarshalAs(UnmanagedType.AsAny)]Object 对象名称
 
 
        
        //c++:char, INT8, SBYTE, CHAR                               —-    c#:System.SByte  
        //c++:short, short int, INT16, SHORT                        —-    c#:System.Int16  
        //c++:int, long, long int, INT32, LONG32, BOOL , INT        —-    c#:System.Int32  
        //c++:__int64, INT64, LONGLONG                              —-    c#:System.Int64  
        //c++:unsigned char, UINT8, UCHAR , BYTE                    —-    c#:System.Byte  
        //c++:unsigned short, UINT16, USHORT, WORD, ATOM, WCHAR , __wchar_t             —-    c#:System.UInt16  
        //c++:unsigned, unsigned int, UINT32, ULONG32, DWORD32, ULONG, DWORD, UINT      —-    c#:System.UInt32  
        //c++:unsigned __int64, UINT64, DWORDLONG, ULONGLONG                            —-    c#:System.UInt64  
        //c++:float, FLOAT                                                              —-    c#:System.Single  
        //c++:double, long double, DOUBLE                                               —-    c#:System.Double
                //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);
 
        //unsigned char** ppImage替换成IntPtr ppImage
        //int& nWidth替换成ref int nWidth
        //int*, int&, 则都可用 ref int 对应
        //双针指类型参数，可以用 ref IntPtr
        //函数指针使用c++: typedef double (*fun_type1)(double); 对应 c#:public delegate double  fun_type1(double);
        //char* 的操作c++: char*; 对应 c#:StringBuilder;
        //c#中使用指针:在需要使用指针的地方 加 unsafe
 
        //unsigned   char对应public   byte
        /*
         * typedef void (*CALLBACKFUN1W)(wchar_t*, void* pArg);
         * typedef void (*CALLBACKFUN1A)(char*, void* pArg);
         * bool BIOPRINT_SENSOR_API dllFun1(CALLBACKFUN1 pCallbackFun1, void* pArg);
         * 调用方式為
         * [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
         * public delegate void CallbackFunc1([MarshalAs(UnmanagedType.LPWStr)] StringBuilder strName, IntPtr pArg);
         * 
         * 
         */

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