Question

I have used DLL Export viewer to try and find the functions that are in this DLL, I have found a list of functions and here it is:

public: int __thiscall CSTVdsDisk::GetPartitionCount(void);

the question is within in C# I am not able to call the function using either:

[DllImport("Some.dll", 
           ExactSpelling = true,
           EntryPoint = "GetPartitionCount",
           CallingConvention = CallingConvention.StdCall,
           SetLastError = true)]

or:

[DllImport("Some.dll", 
           ExactSpelling = true,
           EntryPoint = "CSTVdsDisk::GetPartitionCount",
           CallingConvention = CallingConvention.StdCall,
           SetLastError = true)]
private static extern int GetPartitionSize();

They all fail. Is there something that I am doing wrong? Can anyone help? Thanks!

Answer 1

You can’t call that function using P/Invoke. The __thiscall calling reference means that this function is a class member function. It is a member function of the CSTVdsDisk class.

To be able to call the function you will have to create an instance of the CSTVdsDisk class and call GetPartitionCount from that instance.

You’ll have to do that in C++ or C++/CLR as you can’t create a C++ class in C#. See also Create unmanaged c++ object in c#.