PInvoke signiture FAR*

Question

此函数的C#签名应该是什么？(适用于pInvoke)

DWORD GetVatAccount(COleDateTime dtDateTime, BSTR FAR* strResult)

Answer 1

[DllImport("test.dll")]
private static extern int GetVatAccount(
    double dtDateTime, 
    StringBuilder strResult
);

或者：

[DllImport("test.dll")]
private static extern int GetVatAccount(
    double dtDateTime, 
    [MarshalAs(UnmanagedType.BStr)]ref string strResult
);

dates和double之间的转换可以使用DateTime.FromOADate和DateTime.ToOADate方法完成。