无法将数组引用从c ++ / cli传递回vb.net(Trouble passing array reference back from c++/cli to vb.net)

 我试图将一个对象数组从c ++ / cli方法传回给调用的VB.NET例程。 函数调用返回bool以指示成功或失败，并且通过参数调用在对象数组中返回扩展信息。 
 
 我已将代码剥离为两个示例代码单元以演示问题。 
 
 应在调用TestReplaceArray之后填写TSAResult数组。 例如： 
 
    Dim TSAResult() As TestStruct = Nothing
    Dim MTCP As New TestCppPart()
    MTCP.TestReplaceArray(TSAResult)
 
 我没有回到我的期望，这可能是我愚蠢的事情，这会让回报变得渺茫。 
 
 为了获得更多诊断信息以查看事物分离的地方，我创建了这个调用例程，它填充TestStructureArray只是为了查看调用方法中出现的内容： 
 
'This is the VB.Net caller routine
Dim TestStructArray() As TestStruct = Nothing
TestStructArray = New TestStruct(1) {}
Dim TSAResult() As TestStruct = Nothing

Dim TS As New TestStruct 'put some junk in it
TS.somevar = 10
TestStructArray(0) = TS
TS = New TestStruct
TS.somevar = 11
TestStructArray(1) = TS

Dim MTCP As New TestCppPart()
MTCP.TestReplaceArray(TestStructArray) 'Call the cpp/cli routine
TSAResult = TestStructArray 'take a gander and what came back
 
 调用的C ++ / CLI例程是： 
 
// compiled with /clr
public ref struct TestStruct {
    int somevar;
};

public ref class TestCppPart {
public:
  void TestReplaceArray(array<TestStruct ^>^ IPInfoArray) {
    IPInfoArray = gcnew array<TestStruct ^>(5);
  }
};
 
 我可以看到传递给对象数组的（仅用于测试）就是我传递的内容。 我还可以看到我可以用“IPInfoArray = gcnew array（5）;”替换数组。 线。 它在元素中没有任何内容，但IPInfoArray现在引用了一个5元素数组。 
 
 返回到VB.Net代码时，原始（仅测试）数组仍然存在并填充。 
 
 我无法弄清楚的是如何告诉c ++ / cli我想要更新对数组的引用（如果你愿意的话，ByRef），所以它将使用新数组返回VB.Net。 
 
 谢谢，我觉得这应该是显而易见的，但我被困住了！ 

I am trying to pass an array of objects back from a c++/cli method back to the calling VB.NET routine. The function call returns a bool to indicate success or fail and extended information is returned in an Array of Objects via a parameter to the call.
 
I have stripped the code down to two example code units for demonstration of the problem.
 
The TSAResult Array should be filled in after the call to TestReplaceArray. e.g.:
 
    Dim TSAResult() As TestStruct = Nothing
    Dim MTCP As New TestCppPart()
    MTCP.TestReplaceArray(TSAResult)
 
I'm not getting back what I expect and it's probably something dumb on my part that's fouling the return.
 
To get more diagnostic inforamtion to see where things were going apart, I created this calling routine which populates the TestStructureArray just to see what showed up in the called method:
 
'This is the VB.Net caller routine
Dim TestStructArray() As TestStruct = Nothing
TestStructArray = New TestStruct(1) {}
Dim TSAResult() As TestStruct = Nothing

Dim TS As New TestStruct 'put some junk in it
TS.somevar = 10
TestStructArray(0) = TS
TS = New TestStruct
TS.somevar = 11
TestStructArray(1) = TS

Dim MTCP As New TestCppPart()
MTCP.TestReplaceArray(TestStructArray) 'Call the cpp/cli routine
TSAResult = TestStructArray 'take a gander and what came back
 
The C++/CLI routine which is called is: 
 
// compiled with /clr
public ref struct TestStruct {
    int somevar;
};

public ref class TestCppPart {
public:
  void TestReplaceArray(array<TestStruct ^>^ IPInfoArray) {
    IPInfoArray = gcnew array<TestStruct ^>(5);
  }
};
 
I can see that the (for testing only) passed in array of objects is what I passed. I can also see that I can replace the array with the "IPInfoArray = gcnew array(5);" line. It doesn't have anything in the elements, but a 5 element array is now referenced by IPInfoArray.
 
On return to the VB.Net code, the original (testing only) array is still present and populated.
 
What I can't figure out is how to tell the c++/cli that I want to update the reference to the array (ByRef if you will) so it will go back to VB.Net with the new array.
 
Thanks, I feel this should be obvious, but I'm stuck!

原文：https://stackoverflow.com/questions/22851315