Question

我有一个带有此功能的delphi dll：

function writeRate(data: variant):Double ; stdcall;

我使用此方法从c#调用函数：

[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
private delegate double WriteRate(object data);
protected void UpdateRateChannel(string myData)
{   
    IntPtr pDll = NativeMethods.LoadLibrary("mydll.dll");

    IntPtr pAddressOfFunctionToCall = NativeMethods.GetProcAddress(pDll, "writeRate");
    WriteRate writeRate = (WriteRate)Marshal.GetDelegateForFunctionPointer(pAddressOfFunctionToCall, typeof(WriteRate ));


    double response = writeRate(myData);

    bool result = NativeMethods.FreeLibrary(pDll);
}

但我得到了一个例外：

PInvokeStackImbalance was detected

How do I call the dll? I supposed that the issue is in the variant type. thanks!

Answer 1

Delphi代码中的stdcall与CallingConvention.StdCall。您应该修复您的委托定义。

Answer 2

如果Delphi函数被声明为stdcall，为什么要在C#中将其声明为cdecl？

这就是堆栈不平衡的原因。将C#声明更改为使用stdcall约定来匹配Delphi声明。

[UnmanagedFunctionPointer(CallingConvention.StdCall)]
private delegate double WriteRate(object data);

Answer 3

C#中的变量可能与Delphi中的普通变量不兼容。请改用Delphi的OleVariant。

友情链接