快速免责声明:我是P / Invoke的新手,所以如果这是一个愚蠢的问题,我先向您道歉。
这是我在C ++中的函数签名:
HRESULT SomeFunction(
_Out_ unsigned long *count,
_Outptr_result_buffer_(*count) GUID **ids,
_In_ const PCWSTR filter
)
我试图在C#中像这样P /调用它:
[StructLayout(LayoutKind.Sequential)]
struct GUID
{
public int a;
public short b;
public short c;
[MarshalAs(UnmanagedType.ByValArray, SizeConst=8)]
public byte[] d;
}
[DllImport("MyDll.dll", EntryPoint="SomeFunction")]
[return: MarshalAs(UnmanagedType.I8)]
private static extern Int64 SomeFunction
(
out ulong count,
[MarshalAs(UnmanagedType.LPArray)]
out GUID[] ids,
string filter
);
我知道我的代码到达了C ++函数(我可以在windbg中看到它)并且没有崩溃,但是据我所知,参数没有正确传递。我的猜测是我搞砸了C#中的P / Invoke翻译,但我不知道如何解决此问题。任何帮助,将不胜感激!
最佳答案
看起来我找到了解决方案...
[DllImport("MyDll.dll", EntryPoint="SomeFunction")]
[return: MarshalAs(UnmanagedType.I4)]
private static extern int SomeFunction
(
out uint count,
[MarshalAs(UnmanagedType.LPArray)]
out GUID[] ids,
[InAttribute()]
[MarshalAsAttribute(UnmanagedType.LPWStr)]
string filter
);