如何在VB.NET或C＃中使用C ++ API

Question

我需要在.NET中嵌入用C ++编写的API，指纹设备将其用于.NET应用程序。

我尝试使用VB.NET和C＃两种语言，但我仍然无法理解它给我的问题;

Unable to find the entry point in the DLL.

这意味着它访问DLL，但是你能告诉我什么问题？

以下是示例代码：

internal static class UnsafeNativeMethods
{
    const string _dllLocation = "ABCAPI.dll";
    [DllImport(_dllLocation, EntryPoint = "ABCFunc", SetLastError = true, CharSet = CharSet.Ansi, ExactSpelling = true, CallingConvention = CallingConvention.Cdecl    )]
    public static extern bool ABCFunc();
}

Answer 1

[System.Runtime.InteropServices.DllImport("ABCAPI.dll", SetLastError = true)]  
[return: System.Runtime.InteropServices.MarshalAs(System.Runtime.InteropServices.UnmanagedType.Bool)]  
public static extern bool ABCFunc();

Answer 2

谢谢@Hans Passant我做了一个研究并使用“dumpbin / Exports mydllname.dll”并找到函数的实际声明，这最终对我有用。

internal static class UnsafeNativeMethods {
const string _dllLocation = "ABCAPI.dll";
[DllImport(_dllLocation, EntryPoint = "_ABCFunc@4", SetLastError = true, CharSet = CharSet.Ansi, ExactSpelling = true, CallingConvention = CallingConvention.ThisCall    )]
public static extern bool ABCFunc();

}

它完美无瑕，谢谢你的建议。