在C#中,如何调用返回包含字符串指针的非托管结构的DLL函数？

尝试以下布局.使用PInvoke Interop Assistant自动生成代码.手动编码的LookpInfoWrapper()

[System.Runtime.InteropServices.StructLayoutAttribute(System.Runtime.InteropServices.LayoutKind.Sequential)]
public struct Info {

    /// int
    public int id;

    /// char*
    [System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.LPStr)]
    public string szName;
}

public partial class NativeMethods {

    /// Return Type: Info*
    ///id: int
    [System.Runtime.InteropServices.DllImportAttribute("InfoLookup.dll", EntryPoint="LookupInfo")]
public static extern  System.IntPtr LookupInfo(int id) ;

    public static LoopInfoWrapper(int id) {
       IntPtr ptr = LookupInfo(id);
       return (Info)(Marshal.PtrToStructure(ptr, typeof(Info));
    }

}