C#调⽤C++DLL，及回调函数、string参数传递的总结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：cstring转为int
[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：
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[],int nMaxArraySize) {
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, int nMaxArraySize);
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, char b[]))
{
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];
};
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¨ªpublic 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);

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