[英]How to pass a SAFEARRAY from C# to COM?
I have an ATL COM Server, where the method for the interface is 我有一个ATL COM服务器,其中接口的方法是
CVivsBasic::UpdateSwitchPlan(BSTR plan_name, SAFEARRAY* plan)
And the IDL for this function looks like 这个功能的IDL看起来像
typedef struct
{
LONG time_to_play;
BSTR ecportid;
} SwitchPlanItem;
HRESULT UpdateSwitchPlan([in] BSTR plan_name, [in] SAFEARRAY(SwitchPlanItem) plan) ;
I tried to call it from C# like this: 我试图这样从C#调用它:
internal void UpdateSwitch(string plan_name, string ecportid)
{
SwitchPlanItem sp1;
sp1.time_to_play = 33;
sp1.ecportid = ecportid;
SwitchPlanItem sp2;
sp2.time_to_play = 33;
sp2.ecportid = ecportid;
SwitchPlanItem[] sps = { sp1, sp2 };
sdk.UpdateSwitchPlan(plan_name, sps);
}
But it crash. 但是它崩溃了。 What is the correct way to pass a SAFEARRAY from C# to COM? 将SAFEARRAY从C#传递到COM的正确方法是什么?
I think the problem here is that you're using a SAFEARRAY
of user defined types (UDT), SAFEARRAY
s of VARIANT
, BSTR
and IUnknown
work out of the box but for UDT
s you need to help the marshaller along. 我觉得这里的问题是,您使用的是SAFEARRAY
用户定义类型(UDT), SAFEARRAY
第VARIANT
, BSTR
和IUnknown
工作开箱即用,但对于UDT
就是你需要帮助一起编组。 See this article in MSDN regarding Passing Safearray of UDTs . 请参阅MSDN中有关传递UDT的Safearray的文章。
I think the answer to this question is similar to this one: COM - [in] parameter as SAFEARRAY(STRUCT) 我认为这个问题的答案与此类似: COM-[in]参数为SAFEARRAY(STRUCT)
Basically, the C# client that is using an interface where SAFEARRAY(STRUCT) are passed in, has to define Embed Interop Types = False on the imported COM server reference properties. 基本上,使用传入SAFEARRAY(STRUCT)的接口的C#客户端必须在导入的COM服务器引用属性上定义Embed Interop Types = False 。
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