通过引用从c＃传递字节数组到托管c ++ [英] pass byte-array by reference from c# to managed c++
问题描述
你好，
我在C＃中用byte []分配一个字节数组byteArray = new byte [5000];
现在我想通过引用将这个byte-Array传递给托管C ++ - 函数，
这样我就可以更改byteArray的内容，然后看看
C＃中的变化。
（如果你想了解更多细节：目标是将c ++中现有的char-array的内容精确地写入传递的byteArray中，所以那个函数在C＃中使用了byteArray的内容之后的
等于
C ++ char-Array的内容。）
所以我希望你明白我将要做的事 - 不幸的是，我没有
如何做到这一点的线索。
但是，我感谢任何帮助，
by ekim
Ekim< th ****** ******@gmx.net>写道：我在C＃中使用byte []分配一个字节数组byteArray = new byte [5000];
现在我要传递这个字节数组通过引用来管理C ++ - 函数，
这样我就可以更改byteArray的内容，然后看看C＃中的更改。
（如果你想了解更多细节） ：目标是将c ++中现有的char-array的内容精确地写入传递的byteArray中，以便在函数处理完C＃中的byteArray内容后等待
char-C ++数组的内容。）
所以我希望你能理解我将要做的事 - 不幸的是，我没有了解如何做到这一点。
我认为你根本不需要通过引用传递byteArray - 你会
只有在你尝试时才需要这样做更改字节的值
数组本身 - 即将其更改为完全不同的数组。
我wou ld *希望*您可以通过值传递引用（因为
正常）并在C代码中将其作为char *接收，但我远远不是
互操作专家。您是否尝试过询问.interop小组？
-
Jon Skeet - < sk *** @ pobox.com>
http://www.pobox.com/~skeet
如果回复该组，请不要给我发邮件
" Jon Skeet [C＃MVP]" < SK *** @ pobox.com>在消息中写道
新闻：MP ************************ @ msnews.microsoft.c om ...Ekim< th ************ @ gmx.net>写道：我在C＃中使用byte []分配一个字节数组byteArray = new
byte [5000];
现在我要传递这个字节数组到托管C ++ - 函数
引用，这样我就可以改变byteArray的内容，然后
看到C＃中的变化。
（如果你想知道更多细节） ：目标是将c ++中现有的char数组的内容精确地写入传递的byteArray中，以便在函数处理完C＃
中byteArray的内容后等于char-C ++数组的内容。）
所以我希望你能理解我将要做的事 - 不幸的是，我没有了解如何做到这一点。
我认为你根本不需要通过引用传递byteArray - 只有当你试图改变byte的值时才需要这样做/>数组本身 - 即将其更改为完全不同的数组。
我希望*你可以j我按值传递引用（正常），并在C代码中将其作为char *接收，但我远离
互操作专家。您是否尝试过询问.interop组？
是的，我尝试在.interop-ng中询问，但现在没有答案; - （
是的，事实上我只有必须改变byteArray的内容，而不是你想象的那个
地址或大小。
但是我也不知道该怎么做！？
ekim
最近，我尝试使用
int dummy（字节数组__gc []）// c ++函数
{
将charArray复制到byteArray中
}
并从C＃调用它像
byte [] array = new byte [5000]; //分配新的byte-Array
dummy（ref array）; //调用c ++ - 函数
//在这个地方，byteArray-content应该与我复制的
charArray内容相同
顺便说一句，我在C＃中尝试过，有没有ref - 没有工作。
关于它的奇怪之处在于，当我尽快调试我的应用程序时得到
调用，byteArray以某种方式被截断为长度1（而不是
5000）。
有人知道我做错了吗？
hello,
I''m allocating a byte-Array in C# with byte[] byteArray = new byte[5000];
Now I want to pass this byte-Array to a managed C++-function by reference,
so that I''m able to change the content of the byteArray and afterwards see
the changes in C#.
(if you wanna know more details: the goal is to write the content of an
existing char-array in c++ precisely into the passed byteArray, so that
after the function has proceded the content of the byteArray in C# equals
the content of the char-Array of C++.)
So I hope you understand what I''m about to do - unfortunately, I have no
clue how to do this.
However, I appreciate any help,
by ekim
Ekim <th************@gmx.net> wrote:I''m allocating a byte-Array in C# with byte[] byteArray = new byte[5000];
Now I want to pass this byte-Array to a managed C++-function by reference,
so that I''m able to change the content of the byteArray and afterwards see
the changes in C#.
(if you wanna know more details: the goal is to write the content of an
existing char-array in c++ precisely into the passed byteArray, so that
after the function has proceded the content of the byteArray in C# equals
the content of the char-Array of C++.)
So I hope you understand what I''m about to do - unfortunately, I have no
clue how to do this.
I don''t think you need to pass byteArray by reference at all - you''d
need to do that only if you were trying to change the value of byte
array itself - i.e. change it to a completely different array.
I would *hope* that you could just pass the reference by value (as
normal) and receive it as char* in the C code, but I''m far from an
interop expert. Have you tried asking on the .interop group?
--
Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too
"Jon Skeet [C# MVP]" <sk***@pobox.com> wrote in message
news:MP************************@msnews.microsoft.c om...Ekim <th************@gmx.net> wrote:I''m allocating a byte-Array in C# with byte[] byteArray = new byte[5000];
Now I want to pass this byte-Array to a managed C++-function by reference, so that I''m able to change the content of the byteArray and afterwards see the changes in C#.
(if you wanna know more details: the goal is to write the content of an
existing char-array in c++ precisely into the passed byteArray, so that
after the function has proceded the content of the byteArray in C# equals the content of the char-Array of C++.)
So I hope you understand what I''m about to do - unfortunately, I have no
clue how to do this.
I don''t think you need to pass byteArray by reference at all - you''d
need to do that only if you were trying to change the value of byte
array itself - i.e. change it to a completely different array.
I would *hope* that you could just pass the reference by value (as
normal) and receive it as char* in the C code, but I''m far from an
interop expert. Have you tried asking on the .interop group?
Yes, I tries asking in the .interop-ng, but no answers ''til now ;-(
yeah in fact I "only" have to change the content of the byteArray, not its
address or size as you might think.
But I don''t know how to do that also!?
ekim
Lately, I tried using a
int dummy(Byte array __gc[]) // c++ function
{
copy charArray into byteArray
}
and calling it from C# like
byte[] array = new byte[5000]; // allocate new byte-Array
dummy(ref array); // call c++-function
// in this place, the byteArray-content shall be the same as the
charArray-content I copied from
by the way, I tried it in C# with and without "ref" - neither did work.
the queer thing about it is, when I debug my app as soon as "dummy" gets
called, the byteArray is somehow truncated to the length 1 (instead of
5000).
does somebody know what I did wrong?
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