函数调用导致堆栈不对称。原因可能是托管的 PInvoke 签名与非托管的目标签名不匹配。在dllimport中加入CallingConvention参数就行了，[DllImport(PCAP_DLL, CharSet = CharSet.Auto, CallingConvention = CallingConvention.Cdecl)]要注意C++与NET中数据类型的对应：  //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++:SHORT(short) ---- c#:System.Int16    //c++:LONG(long) ---- c#:System.Int32  转载收集：//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);  *    *    */