[英]How to pass SAFEARRAY of UDTs to unmaged code from C#
I also used VT_RECORD. 我也用过VT_RECORD。 But didn't got success in passing safearray of UDTs.
但是没有成功通过UDT的安全阵列。
[ComVisible(true)]
[StructLayout(LayoutKind.Sequential)]
public class MY_CLASS
{
[MarshalAs(UnmanagedType.U4)]
public Int32 width;
[MarshalAs(UnmanagedType.U4)]
public Int32 height;
};
[DllImport("mydll.dll")]
public static extern Int32 GetTypes(
[In, Out][MarshalAs(UnmanagedType.SafeArray, SafeArraySubType = VarEnum.VT_RECORD, SafeArrayUserDefinedSubType = typeof(MY_CLASS))]MY_CLASS[] myClass,
[In, Out][MarshalAs(UnmanagedType.SafeArray, SafeArraySubType = VarEnum.VT_RECORD, SafeArrayUserDefinedSubType = typeof(Guid))]Guid[] guids
);
If i communicate with my unmanaged code without 1st parameter, Then there is no error in passing "guids" parameter to unmanaged code. 如果我在没有1st参数的情况下与我的非托管代码进行通信,那么将“guids”参数传递给非托管代码就没有错误。
I also able to cast elements of obtained SAFEARRAY at unmanaged side to GUID type. 我还能够在非托管端将获得的SAFEARRAY元素转换为GUID类型。 But If i tried to pass my UDT class MY_CLASS to unmanaged code with SAFEARRAY then it fails on managed code.
但是如果我试图通过SAFEARRAY将我的UDT类MY_CLASS传递给非托管代码,那么它在托管代码上失败了。 (as above code snippet)
(如上面的代码片段)
It shows exception "An unhandled exception of type 'System.Runtime.InteropServices.SafeArrayTypeMismatchException' occurred in myapp.exe" "Additional information: Specified array was not of the expected type." 它显示异常“myapp.exe中出现类型'System.Runtime.InteropServices.SafeArrayTypeMismatchException'的未处理异常”“附加信息:指定的数组不是预期的类型。”
Plz help me in such a situation to pass SAFEARRAY of UDTs to unmaged code. Plz帮助我在这种情况下将SAFEARRAY的UDT传递给了未损坏的代码。
I tried an alternative to this problem. 我尝试了替代这个问题。 I passed UDT having SAFEARRAYs as its members to unmanaged code.
我通过UDT将SAFEARRAY作为其成员使用非托管代码。
Here is managed code that I followed, 这是我遵循的托管代码,
[ComVisible(true)]
[StructLayout(LayoutKind.Sequential)]
public class MY_CLASS
{
[MarshalAs(UnmanagedType.SafeArray, SafeArraySubType = VarEnum.I4)]
public Int32[] width;
[MarshalAs(UnmanagedType.SafeArray, SafeArraySubType = VarEnum.I4)]
public Int32[] height;
};
[DllImport("mydll.dll")]
public static extern Int32 GetTypes(
[In, Out] MY_CLASS myClass
);
and on unmanaged side, 在非管理方面,
typedef struct _MY_STRUCT
{
SAFEARRAY * pWidths;
SAFEARRAY * pHeights;
}MY_STRUCT;
HRESULT GetTypes(MY_STRUCT * pMyStruct)
{
// Here I can use pMyStruct->pWidths or pMyStruct->pHeights
// paramater as safearray of int32 type.
// I can modify it's element and it will be visible
// on managed side.
return S_OK;
}
I uses this type of mechanism to pass UDT having array of Value-Types instead of passing array of UDTs. 我使用这种类型的机制来传递具有Value-Types数组的UDT,而不是传递UDT数组。
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