C#调用C/C++ DLL 参数传递和回调函数的总结
Int型传入：
Dll端：
| extern "C" __declspec(dllexport) int Add(int a, int b) { return a+b; } |
C#端：
| [DllImport("aeClient2.0.dll", CallingConvention =CallingConvention.Cdecl)] public static extern unsafe int Add(int a, int b); |
Int型传入传出：
Dll端：
| extern "C" __declspec(dllexport) int Add(int *a, int* b) { *a = 2; *b = 3; return add(2, 3); } |
C#端
| [DllImport("aeClient2.0.dll", CallingConvention =CallingConvention.Cdecl)] public static extern unsafe int Add(int a, int b); |
String传入：
Dll端：
| extern "C" __declspec(dllexport) BOOL sendMessage(char* msg) { CString str = msg; ::AfxMessageBox(str.GetBuffer(0)); return 3; } |
C#端：
| [DllImport("aeClient1.1.dll", CallingConvention =CallingConvention.Cdecl)] public static extern int sendMessage(string msg);
string strin = "llqq哈t哈t哈t呵?呵?"; sendMessage(strin); |
String型传入传出：
Dll端：
| extern "C" __declspec(dllexport) BOOL GetErrorMessage(char *szErrorMessage ) { CString str = szErrorMessage; AfxMessageBox(str); char tmp[] = "nm世界和平nmnm"; strcpy(szErrorMessage,tmp); return 3; } |
C#端：
| [DllImport("aeClient1.1.dll", CallingConvention =CallingConvention.Cdecl)] public static extern int GetErrorMessage(StringBuilder msg);
StringBuilder buf = new StringBuilder(1024);//指定的buf大小必须大于传入的字符长度 buf.Append("abc中国人"); int outdata = GetErrorMessage(buf, 1); string strout = buf.ToString(); |
结构体传入：
Dll端：
| class NET_INFO_STRUCT { public: DWORD nDurationTime; //持?续?时º¡À间? double nReceiveByte; //接¨®收º?字Á?节¨² double nSendByte; //发¤¡é送¨ª字Á?节¨² WORD word; char buf[200]; FILETIME time; }; extern "C" __declspec(dllexport) BOOL NetGetConnectDetail(NET_INFO_STRUCT lpNetInfo) { ::AfxMessageBox(lpNetInfo.buf); return 3; }
|
C#端
| public struct FILETIME { public uint high; public uint low; } public struct NET_INFO_STRUCT { public uint nDurationTime; //持?续?时º¡À间? public double nReceiveByte; //接¨®收º?字Á?节¨² public double nSendByte; //发¤¡é送¨ª字Á?节¨² public ushort ush; [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 200)] public string str; public FILETIME time; } ; [DllImport("aeClient1.1.dll", CallingConvention =CallingConvention.Cdecl)] public static extern unsafe int NetGetConnectDetail(NET_INFO_STRUCT lpNetInfo);
NET_INFO_STRUCT stru = new NET_INFO_STRUCT(); stru.nDurationTime = 8989; stru.nReceiveByte = 89.89; stru.nSendByte = 89.8900; stru.ush = 56; stru.str = "来来去去ypfisja"; stru.time.high = 24; stru.time.low = 17; NetGetConnectDetail(stru); |
结构体数组传出：
Dll端：
| struct UIM_BOOK_STRUCT { int UimIndex; char szName[15]; char szPhone[21]; }; extern "C" __declspec(dllexport) int ReadUimAllBook(UIM_BOOK_STRUCT lpUimBookItem[],intnMaxArraySize) { lpUimBookItem[0].UimIndex = 345; strcpy(lpUimBookItem[0].szName , "dsd"); strcpy(lpUimBookItem[0].szPhone , "bbbb");
lpUimBookItem[1].UimIndex = 111; strcpy(lpUimBookItem[1].szName , "ddddd"); strcpy(lpUimBookItem[1].szPhone , "vvvvvv");
lpUimBookItem[2].UimIndex = 2222; strcpy(lpUimBookItem[2].szName , "d3343434sd"); strcpy(lpUimBookItem[2].szPhone , "bbbfggfggggfgb");
return 4; } |
C#端：
| [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)] public struct UIM_BOOK_STRUCT { public int UimIndex; [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 15)] public string szName; [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 21)] public string szPhone; }; [DllImport("aeClient1.1.dll", CallingConvention =CallingConvention.Cdecl)] public static extern unsafe int ReadUimAllBook([Out] UIM_BOOK_STRUCT[] lpUimBookItem, intnMaxArraySize);
UIM_BOOK_STRUCT[] p = new UIM_BOOK_STRUCT[20]; int rets = ReadUimAllBook(p, p.Length); |
回调函数传递字符串：
Dll端：
| typedef int (*pfCallBack)(int a, char b[]); pfCallBack CallBackfun = NULL;
extern "C" __declspec(dllexport) void SetCB(int (*pfCallBack)(int a, charb[])) { CallBackfun = pfCallBack; } char ch[100]; extern "C" __declspec(dllexport) void callTheCB() { int a = 4; memset(ch, '\0', 100); strcpy(ch, "aabbcc"); CallBackfun(a, ch); } |
C#端
| //定¡§义°?一°?个?委¡¥托ªD，ê?其?返¤¦Ì回?类¤¨¤型¨ª和¨ª形?参?与®?方¤?法¤¡§体¬?的Ì?返¤¦Ì回?类¤¨¤型¨ª形?参?一°?致? [UnmanagedFunctionPointer(CallingConvention.Cdecl)]//一°?定¡§要°a加¨®上¦?这a句?，ê?要°a不?然¨?C#中D的Ì?回?调Ì¡Â函¡¥数ºy只?要°a被À?调Ì¡Â用®?一°?次ä?，ê?程¨¬序¨°就¨ª异°¨¬常¡ê退ª?出?了¢?！ê?！ê?！ê? public delegate int callBackHandler(int a, [MarshalAs(UnmanagedType.LPStr)]StringBuilder b); callBackHandler fun;//声¦¨´明¡Â一°?个?委¡¥托ªD变À?量¢? [DllImport("xxx.dll", CallingConvention =CallingConvention.Cdecl)] public static extern unsafe void SetCB(callBackHandler fun1); [DllImport("xxx.dll", CallingConvention =CallingConvention.Cdecl)] public static extern unsafe void callTheCB();
int localFun(int a, [MarshalAs(UnmanagedType.LPStr)]StringBuilder b) { MessageBox.Show(b.ToString()); return 0; }
fun = new callBackHandler(localFun);//给?委¡¥托ªD变À?量¢?赋3值¦Ì SetCB(fun);//用®?委¡¥托ªD当Ì¡À做Á?函¡¥数ºy指?针?作Á¡Â为a参?数ºy传ä?入¨? callTheCB(); |
回调函数传递结构体：
Dll端：
| struct REvent { REvent(ONEVENTSTRUCT* pEVENTSTRUCT); WORD m_ChangeMask; WORD m_State; char m_Source[200]; };
typedef void (*pfCallBackEvent)(REvent eve/*, char m_Source[]*/); pfCallBackEvent CallBackfunEvent = NULL; extern "C" __declspec(dllexport) void SetCBEvent(void (*pfCallBackEvent)(REvent eve/*, char m_Source[]*/)) { CallBackfunEvent = pfCallBackEvent; } void callCBEvent(REvent eve/*, char m_Source[]*/) { CallBackfunEvent(eve/*, m_Source*/); }
//调用回调函数 callCBEvent(*pREvent/*, pEvent->m_Message.GetBuffer(0)*/); |
C#端：
| [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)] public struct REvent { public ushort m_ChangeMask; public ushort m_State; [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 200)] public string m_Source; };
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]//可¨¦以°?指?定¡§编À¨¤码?类¤¨¤型¨ª public struct EventSourceTag { //[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 200)] public IntPtr name; }; //定¡§义°?一°?个?委¡¥托ªD，ê?其?返¤¦Ì回?类¤¨¤型¨ª和¨ª形?参?与®?方¤?法¤¡§体¬?的Ì?返¤¦Ì回?类¤¨¤型¨ª形?参?一°?致? [UnmanagedFunctionPointer(CallingConvention.Cdecl, CharSet = CharSet.Ansi)]//一°?定¡§要°a加¨®上¦?这a句?，ê?要°a不?然¨?C#中D的Ì?回?调Ì¡Â函¡¥数ºy只?要°a被À?调Ì¡Â用®?一°?次ä?，ê?程¨¬序¨°就¨ª异°¨¬常¡ê退ª?出?了¢?！ê?！ê?！ê? public delegate void CBEventHandle(REvent eve/*, [MarshalAs(UnmanagedType.LPStr)]StringBuilder source*/); CBEventHandle cbFun;//声¦¨´明¡Â一°?个?委¡¥托ªD变À?量¢? [DllImport("xxx.dll", CharSet = CharSet.Ansi, CallingConvention = CallingConvention.Cdecl)] public static extern unsafe void SetCBEvent(CBEventHandle fun);
void CBEvent(REvent eve/*, [MarshalAs(UnmanagedType.LPStr)]StringBuilder source*/) { //string str = Marshal.PtrToStringAnsi(source); //string str = System.Text.Encoding.Default.GetString(source); MessageBox.Show(eve.m_Message.ToString()); }
cbFun = new CBEventHandle(CBEvent); SetCBEvent(cbFun); |