IntPtr的索引 [英] Indexing of IntPtr

问题描述

我有一个指向数组的指针，我想对这个数组应用索引，所以我将
的函数（命名为IntPrt Func []）转到我可以使用的某个成员（如

C ++）Func [5]，但是在C＃中我收到错误无法使用[]将索引应用于

类型''System.IntPtr'''的表达式。


如何摆脱它？


TNX


-

Tamir Khason

您想要dot.NET吗？只需询问：

"请， www.dotnet.us

I have a pointer to array and I want to apply indexing to this Array so I
have function (name it IntPrt Func[]) to go to certain member I can use (as
C++) Func[5], but in C# I recieve an error "Cannot apply indexing with [] to
an expression of type ''System.IntPtr''".

How to get rid of it?

TNX

--
Tamir Khason
You want dot.NET? Just ask:
"Please, www.dotnet.us "

推荐答案

我认为你误解了IntPtr的本质。它不是用来表示通过interop检索的不透明句柄 - 它不是指向整数或整数大小指针的指针。重点是它的东西。您收到并传递回互操作层（以及操作系统或其他DLL）。如果你想走一个特定的数组，只需将索引放入数组或使用foreach。


你究竟想要实现什么？


问候


Richard Blewett - DevelopMentor

http://staff.develop.com/richardb/weblog

nntp：//news.microsoft.com/microsoft.public.dotnet.languages .csharp /< #G ************** @ TK2MSFTNGP11.phx.gbl>


我有一个指向数组的指针，我想要将索引应用于此数组，以便我将
具有函数（将其命名为IntPrt Func []）转到我可以使用的某个成员（如

C ++）Func [5]，但是在C＃中我收到一个错误无法使用[]对索引进行索引。

表达式为''System.IntPtr''的表达式。


如何摆脱它？


TNX


-

Tamir Khason

你想要dot.NET吗？只需询问：

"请， www.dotnet.us


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[microsoft.public.dotnet.languages.csharp]

I think you misunderstand the nature of IntPtr. It is mean''t to be used to represent an opaque handle retrieved via interop - its not a pointer to an integer or a pointer of integer size. The point is its a "thing" that you receive from and pass back to the interop layer (and so to the operating system or some other DLL). if you want to walk a specific array just index into the array or use foreach.

What exactly are you trying to achieve?

Regards

Richard Blewett - DevelopMentor

http://staff.develop.com/richardb/weblog

nntp://news.microsoft.com/microsoft.public.dotnet.languages.csharp/<#G**************@TK2MSFTNGP11.phx.gbl>

I have a pointer to array and I want to apply indexing to this Array so I
have function (name it IntPrt Func[]) to go to certain member I can use (as
C++) Func[5], but in C# I recieve an error "Cannot apply indexing with [] to
an expression of type ''System.IntPtr''".

How to get rid of it?

TNX

--
Tamir Khason
You want dot.NET? Just ask:
"Please, www.dotnet.us "

---
Incoming mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.766 / Virus Database: 513 - Release Date: 17/09/2004

[microsoft.public.dotnet.languages.csharp]

正如我之前提到的，我构建了一个函数，从非托管返回

指向数组项的指针覆盖了this。方法，所以当使用Func [1]它

将返回指向源数组的第一个成员的指针，但是（请参阅消息）调用此函数时出现

错误

" Richard Blewett [DevelopMentor]" < RI ****** @ develop.com>在留言中写道

新闻：OX ************** @ tk2msftngp13.phx.gbl ...

As I mentioned earlier I build a function with return from unmanaged the
pointer to array item on override of "this" method so when using Func[1] it
will return the pointer to 1st member of source array, but (see message) an
error on calling this function

"Richard Blewett [DevelopMentor]" <ri******@develop.com> wrote in message
news:OX**************@tk2msftngp13.phx.gbl...

我觉得你误会了IntPtr的本质。它不是用来代表通过互操作检索的不透明句柄 - 它不是指向整数或整数大小指针的指针。重点是它的东西。您收到并传递回互操作层（以及操作系统或其他DLL）。如果你想走一个特定的数组只需索引
到数组中或使用foreach。

你到底想要实现什么？

问候

Richard Blewett - DevelopMentor

http：// staff.develop.com/richardb/weblog

nntp：//news.microsoft.com/microsoft.public.dotnet.languages.csharp/< #G ***** *********@TK2MSFTNGP11.phx.gbl>

我有一个指向数组的指针，我想对这个数组应用索引，所以我有功能（命名它） IntPrt Func []）去某些成员我可以使用
（作为
C ++）Func [5]，但在C＃中我收到错误无法用[]
应用索引
System.IntPtr类型的表达式。

如何摆脱它？

TNX

-
Tamir Khason
你想要dot.NET吗？只需询问：
请， www.dotnet.us "

---
收到的邮件经过无病毒认证。
由AVG反病毒系统检查（ http://www.grisoft.com）。
版本：6.0.766 /病毒库：513 - 发布日期：17/09/2004

[microsoft.public.dotnet.languages.csharp]

I think you misunderstand the nature of IntPtr. It is mean''t to be used to
represent an opaque handle retrieved via interop - its not a pointer to an
integer or a pointer of integer size. The point is its a "thing" that you
receive from and pass back to the interop layer (and so to the operating
system or some other DLL). if you want to walk a specific array just index
into the array or use foreach.

What exactly are you trying to achieve?

Regards

Richard Blewett - DevelopMentor

http://staff.develop.com/richardb/weblog
nntp://news.microsoft.com/microsoft.public.dotnet.languages.csharp/<#G**************@TK2MSFTNGP11.phx.gbl>

I have a pointer to array and I want to apply indexing to this Array so I
have function (name it IntPrt Func[]) to go to certain member I can use
(as
C++) Func[5], but in C# I recieve an error "Cannot apply indexing with []
to
an expression of type ''System.IntPtr''".

How to get rid of it?

TNX

--
Tamir Khason
You want dot.NET? Just ask:
"Please, www.dotnet.us "

---
Incoming mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.766 / Virus Database: 513 - Release Date: 17/09/2004

[microsoft.public.dotnet.languages.csharp]

我是否做到了：你把数组转换为IntPtr，并且想要稍后使用那个

IntPtr来访问数组中的数据？这将永远不会起作用：GC可能会移动数组，甚至可以在不更改IntPtr的情况下释放它。你可以暂时修复mamanged堆上的一个对象，但这只能在一个固定块内部实现
，一旦你离开一个函数就会结束。


Niki


" Tamir Khason" < TA ********** @ tcon-NOSPAM.co.il>写在

新闻：ep ************* @tk2msftngp13.phx.gbl ...

Did I get that right: You cast an array to IntPtr, and want to use that
IntPtr later to access data in the array? This will never work: The GC might
move the array, or even free it without changing your IntPtr. You can
temporarily fix an object on the mamanged heap, but this is only possible
inside a fixed-block, which ends as soon as you leave a function.

Niki

"Tamir Khason" <ta**********@tcon-NOSPAM.co.il> wrote in
news:ep*************@tk2msftngp13.phx.gbl...

正如我之前提到的，我建立了一个函数从非托管返回
指向覆盖this的数组项。方法所以当使用Func [1]
它会将指针返回到源数组的第一个成员，但是（参见
消息）调用此函数时出错

理查德Blewett [DevelopMentor]" < RI ****** @ develop.com>在消息中写道
新闻：OX ************** @ tk2msftngp13.phx.gbl ...

As I mentioned earlier I build a function with return from unmanaged the
pointer to array item on override of "this" method so when using Func[1]
it will return the pointer to 1st member of source array, but (see
message) an error on calling this function

"Richard Blewett [DevelopMentor]" <ri******@develop.com> wrote in message
news:OX**************@tk2msftngp13.phx.gbl...

我认为你误解了IntPtr的本质。它不是用来代表通过互操作检索的不透明句柄 - 它不是指向整数或整数大小指针的指针。重点是它的东西。您收到并传递回互操作层（以及操作系统或其他DLL）。如果你想走一个特定的数组只需索引
到数组中或使用foreach。

你到底想要实现什么？

问候

Richard Blewett - DevelopMentor

http：// staff.develop.com/richardb/weblog

nntp：//news.microsoft.com/microsoft.public.dotnet.languages.csharp/< #G ***** *********@TK2MSFTNGP11.phx.gbl>

我有一个指向数组的指针，我想对这个数组应用索引，所以我有功能（命名它） IntPrt Func []）去某些成员我可以使用
（作为
C ++）Func [5]，但在C＃中我收到错误无法用[]
应用索引
System.IntPtr类型的表达式。

如何摆脱它？

TNX

-
Tamir Khason
你想要dot.NET吗？只需询问：
请， www.dotnet.us "

---
收到的邮件经过无病毒认证。
由AVG反病毒系统检查（ http://www.grisoft.com）。
版本：6.0.766 /病毒库：513 - 发布日期：17/09/2004

[microsoft.public.dotnet.languages.csharp]

I think you misunderstand the nature of IntPtr. It is mean''t to be used to
represent an opaque handle retrieved via interop - its not a pointer to an
integer or a pointer of integer size. The point is its a "thing" that you
receive from and pass back to the interop layer (and so to the operating
system or some other DLL). if you want to walk a specific array just index
into the array or use foreach.

What exactly are you trying to achieve?

Regards

Richard Blewett - DevelopMentor

http://staff.develop.com/richardb/weblog
nntp://news.microsoft.com/microsoft.public.dotnet.languages.csharp/<#G**************@TK2MSFTNGP11.phx.gbl>

I have a pointer to array and I want to apply indexing to this Array so I
have function (name it IntPrt Func[]) to go to certain member I can use
(as
C++) Func[5], but in C# I recieve an error "Cannot apply indexing with []
to
an expression of type ''System.IntPtr''".

How to get rid of it?

TNX

--
Tamir Khason
You want dot.NET? Just ask:
"Please, www.dotnet.us "

---
Incoming mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.766 / Virus Database: 513 - Release Date: 17/09/2004

[microsoft.public.dotnet.languages.csharp]

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