C# 如何从c调用c非托管dll中的类ref对象# 我试图从C++应用程序调用C++ uMnangangdDLL Read类对象。使用VC++进行DLL函数调用

我的VC++代码如下

class  METHOD_TYPE CDeskApi
{
public:
    CDeskApi(void);

        /*
    Description : Initiates a connection to NEST system
    Parameters  : 1. serialkey provided to implement the api
                  2. object of CDeskApiCallback implemented

    Return      : 0 in case of success and -1 in case of error  
        */  
    int Initialise(char *serialkey, CDeskApiCallback* callback);
        /*
        Description : Request data from the server
        Parameters  : 1. symbol of interest
                      2. intervals of 1 min, multiples of 1 min, DAILY_PERIOD in case of daily.
                      3. data to be retrieved from. in no of seconds since epoch
                      4. identifier, which is returned in the callback          
        Return      : 0 in case of success and -1 in case of error  
        */      

    ~CDeskApi(void);
};

class METHOD_TYPE CDeskApiCallback    
{
public:    
};


class Myhandler : public CDeskApiCallback    
{    
public:

    virtual int quote_notify( const char* symbol, int size, Quotation *pQuotes, unsigned long echo)
    {
        return 0;    
    };    
};

Myhandler handler;

void Cnest_desk_appDlg::OnBnClickedOk()    
{    
    if(odesk.Initialise("VWAP", &handler))    
    {    
        AfxMessageBox("Error!");

        return;//error
    }    
}

[DllImport("DeskApi.dll", EntryPoint = "?Initialise@CDeskApi@@QAEHPADPAVCDeskApiCallback@@@Z")]
static extern void DeskApiInitialize(IntPtr symbol, callback fn);

private delegate int callback(IntPtr symbol, int nMaxSize, ref Quotation pQuotes, ulong echo);

private callback mInstance;

private void btnFetch_Click(object sender, EventArgs e)
{
    IntPtr ptrCString = (IntPtr)Marshal.StringToHGlobalAnsi(txtFetch.Text);

    CallTest.DeskApiGetQuote(ptrCString,quote_notify);

    Marshal.FreeHGlobal(ptrCString);    
}

private int quote_notify(IntPtr symbol, int nMaxSize, ref Quotation pQuotes, ulong echo)
{
    return 0;    
}

我的C#代码如下

class  METHOD_TYPE CDeskApi
{
public:
    CDeskApi(void);

        /*
    Description : Initiates a connection to NEST system
    Parameters  : 1. serialkey provided to implement the api
                  2. object of CDeskApiCallback implemented

    Return      : 0 in case of success and -1 in case of error  
        */  
    int Initialise(char *serialkey, CDeskApiCallback* callback);
        /*
        Description : Request data from the server
        Parameters  : 1. symbol of interest
                      2. intervals of 1 min, multiples of 1 min, DAILY_PERIOD in case of daily.
                      3. data to be retrieved from. in no of seconds since epoch
                      4. identifier, which is returned in the callback          
        Return      : 0 in case of success and -1 in case of error  
        */      

    ~CDeskApi(void);
};

class METHOD_TYPE CDeskApiCallback    
{
public:    
};


class Myhandler : public CDeskApiCallback    
{    
public:

    virtual int quote_notify( const char* symbol, int size, Quotation *pQuotes, unsigned long echo)
    {
        return 0;    
    };    
};

Myhandler handler;

void Cnest_desk_appDlg::OnBnClickedOk()    
{    
    if(odesk.Initialise("VWAP", &handler))    
    {    
        AfxMessageBox("Error!");

        return;//error
    }    
}

[DllImport("DeskApi.dll", EntryPoint = "?Initialise@CDeskApi@@QAEHPADPAVCDeskApiCallback@@@Z")]
static extern void DeskApiInitialize(IntPtr symbol, callback fn);

private delegate int callback(IntPtr symbol, int nMaxSize, ref Quotation pQuotes, ulong echo);

private callback mInstance;

private void btnFetch_Click(object sender, EventArgs e)
{
    IntPtr ptrCString = (IntPtr)Marshal.StringToHGlobalAnsi(txtFetch.Text);

    CallTest.DeskApiGetQuote(ptrCString,quote_notify);

    Marshal.FreeHGlobal(ptrCString);    
}

private int quote_notify(IntPtr symbol, int nMaxSize, ref Quotation pQuotes, ulong echo)
{
    return 0;    
}

---

在C语言中，一切正常，但它不调用notify函数。

这是完整的代码吗？我对此表示怀疑，因为在CDeskApiCallback中甚至没有任何方法（这可能是用于回调的类似接口的类）。无论哪种方式，C++“回调”对象都与.NET委托有很大的不同，这就是您试图使用它的方式。

另一个主要缺陷是您试图导入一个C++方法（cDeStAPI：：Initialise）。这部分工作很好，但是你要如何实例化C++类，以便你可以调用Initialise？

---

我相信您可以以某种方式使用p/Invoke，但是出于这个目的，COM或C++/CLI会更好。任何COM或C++/CLI类和接口都将对C#直接可见，而无需在C#代码中编写奇怪的编组指令。

是。你对同一个问题是对的。在我的脑海里。但是我对c++/CLI不太了解，所以您可以提供任何链接或示例。谢谢