调用C ++代码从C＃错误使用c ++ ref中的引用c＃ [英] Calling C++ code from C# error using references in c++ ref in c#

问题描述

所以在我的c ++。dll文件，我得到以下函数：

So in my c++.dll file i got the following function:

    DLL void GetUserPass(char* &userName, char* &passWord)
{
    userName = "ceva";
    passWord = "altceva";
}

现在我想从c＃调用它，但它给我一个错误： / p>

Now I want to call this from c# but it gives me an error:

[DllImport("myDLL.dll")]
private static extern void GetUserPass(ref string userName, ref string passWord);

static void f()
{
        string userName ="";
        string passWord ="";

        GetUserPass(ref userName, ref passWord);
}

错误是：

调用PInvoke函数'下载FTP存档！Download_FTP_Archive.Program :: GetUserPass'具有不平衡的堆栈。这很可能是因为托管PInvoke签名与非托管目标签名不匹配。检查PInvoke签名的调用约定和参数是否与目标非托管签名匹配。

A call to PInvoke function 'Download FTP Archive!Download_FTP_Archive.Program::GetUserPass' has unbalanced the stack. This is likely because the managed PInvoke signature does not match the unmanaged target signature. Check that the calling convention and parameters of the PInvoke signature match the target unmanaged signature.

我应该在C ++ dll文件中试试：

Should I try in C++ dll file something like:

using std::string;
 DLL void GetUserPass(string &userName, string &passWord)
{
    userName = "ceva";
    passWord = "altceva";
}

推荐答案

p>

try the following:

DLL void __stdcall GetUserPass(char* &userName, char* &passWord)
{
    userName = "ceva";
    passWord = "altceva";
}



[DllImport("myDLL.dll", CharSet = CharSet.Ansi, CallingConvention = CallingConvention.StdCall)]
private static extern void GetUserPass(ref IntPtr userName, ref IntPtr passWord);
static void f()
{
        IntPtr userNamePtr = new IntPtr();
        IntPtr passWordPtr = new IntPtr();
        GetUserPass(ref userNamePtr, ref passWordPtr);
        string userName = Marshal.PtrToStringAnsi( userNamePtr );
        string passWord = Marshal.PtrToStringAnsi( passWordPtr );
}

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