C# 调用C++ DLL 的类型转换（转载版）

//C#调用C++的DLL搜集整理的所有数据类型转换方式,可能会有重复或者多种方案,自己多测试
   //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++: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   
 

  //Win32 Types ---- CLR Type   
     
 

  //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);
   * 调用方式为
   * [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
   * public delegate void CallbackFunc1([MarshalAs(UnmanagedType.LPWStr)] StringBuilder strName, IntPtr pArg);
   *  
   *  
   */