将数组从托管代码传递到非托管C ++ ActiveX组件 [英] Passing an array from managed code to unmanaged C++ ActiveX component

问题描述

在较早的文章中将托管C ++ / CLI中的指针传递给ActiveX C ++组件我问过正确的传递方式一个数组（无论是托管还是非托管数组）到在本地C ++中创建的activeX组件。
activeX方法具有以下签名：

  short Component :: CopyToBuffer（short FAR * ptr）{} $导入activeX以在C ++ / CLI中使用时，b $ b  

方法签名显示为

  short Component :: CopyToBuffer（short％ptr）{} $ b $当在C＃中导入时，它显示为
 
 
 <$ p $ <$> 
 p>  short Component :: CopyToBuffer（ref short ptr）{} 
  

是否为原生数组： short * shortsArray = new short [500];

既不是管理数组： array< short> ^ shortsArray = gcnew array< short>（500）;

users ildjarn和Hans Passant建议我需要编辑interop汇编文件以将导出的方法签名更改为类似Component：:( int16 [] ptr）我做了并成功编译该项目，但遇到其他类型的问题（类型不匹配或某事）。

现在我做了一个示例项目，再现问题解决

解决方案包含：

• ActiveX组件的项目，在SomeCompCtl.h中找到一种方法CopyToBuffer
• 
  
• 在C ++ / CLI中的测试项目。


• 另一个C＃中的测试项目也是这样做的

运行项目：
- 只需编译SomeComp即可生成包含ActiveX的Somecomp.ocx。
- regsrv32 ActiveX控件

请注意，我不访问ActiveX代码（我已访问一个版本的代码，但我不能假定开发人员将继续为我提供更新版本的代码），所以任何解决方案都不应该依赖于更改ActiveX接口或代码。我通常只有ocx文件及其tlb文件。

解决方案

签名为 CopyToBuffer ％ptr），你是怎么叫的？如果你做了 CopyToBuffer（myArray [0]）或 CopyToBuffer（& myArray [0]）因为垃圾回收器可以移动你的数组。尝试此操作：

  pin_ptr< short> pinned =& myArray [0]; 
 component-> CopyToBuffer（pinned）; 
  

如果这不起作用，请尝试再次编辑互操作程序集文件，将签名更改为 CopyToBuffer（IntPtr ptr）。因为它更明确的事实，参数是一个简单的指针，也许这将工作更好。

In an earlier post Passing pointer from managed C++/CLI to ActiveX C++ component I've asked about the correct means to pass an array (whether managed or unmanaged array) to an activeX component created in native C++. The activeX method has the following signature:

short Component::CopyToBuffer(short FAR* ptr) {}

when the activeX is imported to be used in C++/CLI

the method signature is displayed as

short Component::CopyToBuffer(short% ptr) {}

when imported in C# it is displayed as

short Component::CopyToBuffer(ref short ptr) {}

However, I was not able to pass the array correctly.

whether native array: short* shortsArray = new short[500];

neither a managed array: array<short>^ shortsArray = gcnew array<short>(500);

users ildjarn and Hans Passant suggested that I need to edit the interop assembly file to change the exported method signature to something like Component::(int16[] ptr) which I did and successfully compiled the project but ran into other kind of problems (type mismatch or something).

So now I've made a sample project that reproduces the problemnSolution
The solution contains:

• A project for the ActiveX component with one method CopyToBuffer found in SomeCompCtl.h
• A test project in C++/CLI. with a single form that has the activeX added to it and a button calls the method with an array of given values.
• Another test project in C# that does the same thing

To run the project: - Simply compile SomeComp to generate Somecomp.ocx which contains the ActiveX. - regsrv32 the ActiveX control

Please note that I don't access to the ActiveX code (I've had access to one version of code but I cannot presume that the developers will continue to provide me with updated versions of code) so any solutions shouldn't depend on changing the ActiveX interfaces or code. I normally only have the ocx file with its tlb file.

解决方案

With the signature as CopyToBuffer(short% ptr), how did you call it? If you did CopyToBuffer(myArray[0]) or CopyToBuffer(&myArray[0]), that could fail because the garbage collector could move the array on you. Try this:

pin_ptr<short> pinned = &myArray[0];
component->CopyToBuffer(pinned);

If that doesn't work, try editing the interop assembly file again, change the signature to CopyToBuffer(IntPtr ptr). Since it's more explicit about the fact that the parameter is a simple pointer, perhaps that will work better.

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