PowerShell：如何将COM对象转换为.NET互操作类型？ [英] PowerShell: how to convert a COM object to an .NET interop type?

问题描述

如我的问题使用PowerShell创建ISO映像：如何将IStream保存到文件？中所述，在PowerShell中，我创建一个< a href =http://technet.microsoft.com/en-us/query/aa380034 =nofollow> IStream 对象，如下所示：

  $ is =（New-Object -ComObject IMAPI2FS.MsftFileSystemImage）.CreateResultImage（）。ImageStream 
  

此对象是（PowerShell）类型 System .__ ComObject 。不知何故PowerShell知道它是一个 IStream ：

  PS C： \> $ is -is [System.Runtime.InteropServices.ComTypes.IConnectionPoint] 
 False 
 PS C：\> $ is -is [System.Runtime.InteropServices.ComTypes.IStream] 
 True 
  

，对此类型的转换失败：

  PS C：\> [System.Runtime.InteropServices.ComTypes.IStream] $是
无法将类型System .__ ComObject的System .__ ComObject值转换为类型System.Runtime.InteropServices.ComT 
 ypes.IStream 。 
 at line：1 char：54 
 + [System.Runtime.InteropServices.ComTypes.IStream] $是<<< 
 + CategoryInfo：NotSpecified：（:) []，RuntimeException 
 + FullyQualifiedErrorId：RuntimeException 
  

如何在不使用C＃代码的情况下进行此转换？

更新：显然，此转换无法正常运行现在，我的目标是将这个 IStream COM对象传递给一些C＃代码（一部分的C＃代码）。

相同的PowerShell脚本使用 Add-Type ），它将成为 System.Runtime.InteropServices.ComTypes.IStream 。那可能吗？

解决方案

您可以尝试传递 $ is 在类似于对象类型的（不安全）c＃方法中，尝试使用 VAR System.Runtime.InteropServices.ComTypes.IStream

  public unsafe static class MyClass 
 {
 public static void MyMethod（object Stream）
 {
 var i = Stream as System.Runtime.InteropServices.ComTypes.IStream; 
 
 //做一些我喜欢i.read（...）和i.write（...）
} 
} 
  

在powershell中添加类型后：

  [MyClass] :: MyMethod（$ is）
  

As described in my question Create ISO image using PowerShell: how to save IStream to file?, in PowerShell I create an IStream object as follows:

$is = (New-Object -ComObject IMAPI2FS.MsftFileSystemImage).CreateResultImage().ImageStream

This object is of (PowerShell) type System.__ComObject. And somehow PowerShell knows that it is an IStream:

PS C:\> $is -is [System.Runtime.InteropServices.ComTypes.IConnectionPoint]
False
PS C:\> $is -is [System.Runtime.InteropServices.ComTypes.IStream]
True

However, a cast to this type fails:

PS C:\> [System.Runtime.InteropServices.ComTypes.IStream] $is
Cannot convert the "System.__ComObject" value of type "System.__ComObject" to type "System.Runtime.InteropServices.ComT
ypes.IStream".
At line:1 char:54
+ [System.Runtime.InteropServices.ComTypes.IStream] $is <<<<
    + CategoryInfo          : NotSpecified: (:) [], RuntimeException
    + FullyQualifiedErrorId : RuntimeException

How do I make this conversion work, without using C# code?

Update: Apparently this conversion cannot be made to work, as x0n's answer says.

Now, my goal is to pass this IStream COM object to some C# code (part of the same PowerShell script using Add-Type), where it would become a .NET object of type System.Runtime.InteropServices.ComTypes.IStream. Is that possible? If not, what alternatives do I have?

解决方案

You can try to pass $is in a (unsafe) c# method like an objecttype and try to handle it with a VARdeclared as System.Runtime.InteropServices.ComTypes.IStream

public unsafe static class MyClass
{
    public static void MyMethod(object Stream) 
    {
       var i = Stream as System.Runtime.InteropServices.ComTypes.IStream; 

    //do something with i like i.read(...) and i.write(...)
    }
}

In powershell after the add-type:

[MyClass]::MyMethod($is)

这篇关于PowerShell：如何将COM对象转换为.NET互操作类型？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！