Call C++ dynamic library (type comparison)

Function calls cause stack asymmetry. The reason may be that the managed PInvoke signature does not match the unmanaged target signature. Just add the CallingConvention parameter to the DLlimPort,

[DllImport(PCAP_DLL, CharSet = CharSet.Auto, CallingConvention = CallingConvention.Cdecl)]

Note the correspondence between C++ and NET data types:

/ / c + + : char * – – c # : the string / / / / c + + : incoming parameters char * – – c # : StringBuilder / / / c + + / out parameters: char * the variable name – – c # : ref string variable name / / c + + : char * input variable name – – c#:string input variable name //c++:char * output variable name – – c#:[MarshalAs(unmanagedtype.lpstr)] StringBuilder output variable name / / c + + : SHORT (SHORT) – – c # : System. Int16 / / c + + : LONG (LONG) – c # : System. Int32

Reprint collection:

// 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++:INT(INT) — c#: unsigned INT — UInt16 //c++: unsigned INT – – c#:System.UInt32 //c++:LONG(LONG) – – c#: system.int32 //c++:ULONG(unsigned LONG) – – c#:System //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. The String / / c + + : LPWSTR (would be *) – c # : System. String / / c + + : LPCSTR (const char *) – – c # : System. The String / / c + + : LPCWSTR (const would *) – c # : System. The String / / c + + : PCAHR – (char *) C # : System. The String / / c + + : BSTR – c # : System. The String / / c + + : FLOAT (FLOAT) – – c # : System. Single / / c + + : DOUBLE (DOUBLE) — – C # : System. Double / / c + + : the VARIANT – c # : System. The Object / / c + + : PBYTE (byte *) – c # : System. Byte []

/ / c + + : BSTR – – c # : StringBuilder / / c + + : LPCTSTR – c # : StringBuilder / / c + + : LPCTSTR – c # : the string / / c + + : LPTSTR – – C# :[MarshalAs(unmanagedtype.lptstr)] string c++: LPTStr – – c#: LPCWSTR – – c#:IntPtr / / c + + : BOOL – – c # : BOOL / / c + + : HMODULE – c # : IntPtr / / c + + : HINSTANCE – c # : IntPtr / / c + + : structure — – c # : public struct structure {}; //c++: struct ** variable name — -c #:out variable name // c#: struct & variable name — -c #:ref struct variable name

/ / c + + : WORD – – c # : ushort / / c + + : DWORD – c # : uint / / c + + : DWORD – c # : int

/ / c + + : UCHAR – – c # : int / / c + + : UCHAR – c # : byte / / c + + : UCHAR * – – c # : the string / / c + + : UCHAR * – – c # : IntPtr

/ / c + + : GUID – – c # : GUID / / c + + : Handle – c # : IntPtr / / c + + : HWND – c # : IntPtr / / c + + : DWORD – c # : int / / c + + : a COLORREF – c # : uint

//c++:unsigned char — – c#:ref byte //c++:unsigned char * — – c#:ref byte C# :[unmanagedtype.lparray] byte[] //c++:unsigned char * — c#:[unmanagedtype.lparray] Intptr

//c++:unsigned char & – – c#:ref byte //c++:unsigned char name – – c#:byte name //c++:unsigned short name – – c#:ushort name //c++:unsigned int name – – c#:uint name – /c++:unsigned long name – – c#:ulong name

//c++:char variable name – – c#:byte variable name // in c++ a character is one byte, in c# a character is two bytes //c++:char array name [array size] – – C# :MarshalAs(unmanagedtype. ByValTStr, SizeConst = SizeConst)] public string array name; ushort

/ / c + + : char * – – c # : the string / / / / c + + : incoming parameters char * – – c # : StringBuilder / / / c + + / out parameters: char * the variable name – – c # : ref string variable name / / c + + : char * input variable name – – c#:string input variable name //c++:char * output variable name – – c#:[MarshalAs(unmanagedtype.lpstr)] StringBuilder output variable name

/ / c + + : char * * — – c # : the string / / c + + : char * * the variable name – – c # : ref string variable name / / c + + : const char * – – c # : the string / / c + + : char [] – – C # : the string / / c + + : char variable names [the array size] – c # : [MarshalAs (UnmanagedType ByValTStr, SizeConst = array size)] public string variable name;

//c++:struct * struct — c#:ref — c#: delegate — c#: delegate

/ / c + + : int – – c # : int / / c + + : int – c # : ref int / / c + + : int & – c # : ref int / / c + + : int * – – c # : ref int / / in c # to be defined before invoking the int variable name = 0;

/ / c + + : * int – c # : IntPtr / / c + + : int32 PIPTR * – – c # : int32 [] / / c + + : float PIPTR * – – c # : float []

/ / c + + : double array name – – c # : * * ref double array name / / c + + : double * [] array name – – c # : ref double array name / / c + + : long – c # : int / / c + + : ulong – – c#:int

//c++:UINT8 * — c#:ref byte // UINT8 = 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 * object name – – C# :([MarshalAs(unmanagedtype.asany)]Object name

//c++:short, short int, INT16, short — c#: system.int16 //c++:int, Long, long int, INT32, LONG32, BOOL, int — c#: INT32 //c++:__int64, INT64, //c++:unsigned char, UINT8, uint3, 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

Delegate static extern int FunCallBack(string STR);

//unsigned char** ppImage = IntPtr ppImage //int& nWidth = ref int nWidth //int*, int&, C++ : typedef double (*fun_type1)(double); Corresponding c#:public delegate double fun_type1(double); C++ : char*; The corresponding c # : StringBuilder; // using Pointers in c# : place Pointers where unsafe is required

Public byte /* * typedef void (*CALLBACKFUN1W)(wchar_t*, void* pArg); * typedef void (*CALLBACKFUN1A)(char*, void* pArg); * bool BIOPRINT_SENSOR_API dllFun1(CALLBACKFUN1 pCallbackFun1, void* pArg); * [UnmanagedFunctionPointer(CallingConvention.Cdecl)] * public delegate void CallbackFunc1([MarshalAs(UnmanagedType.LPWStr)] StringBuilder strName, IntPtr pArg); * * * /

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