字节[]到图像 [英] Byte[] to Image

问题描述

我想将byte []转换为Image。我在新闻组中读到

最好的方法是使用MemoryStream。我试过了，但是在创建图像时总是得到一个

异常（类型为

的未处理异常'System.ArgumentException''发生在system.drawing.dll中。附加

信息：Ungültiger参数verwendet）。这是我的代码：


Image newImage;

using（MemoryStream ms = new MemoryStream（length））

{

byte [] bArray = new byte [length];

for（int k = 0; k< length; k ++）

{

bArray [k] = 10;

}

ms.Write（bArray，0，length）;

newImage = Image.FromStream（ms）;

}

}


感谢您的帮助！

Arno

解决方案

在将流传递给Image

构造函数之前，必须先设置流的位置。

ms.Position = 0;


" Arno" <き****** @ gmx.de>在消息新闻中写道：e0 ********** @ online.de ...

我想将一个byte []转换为一个图像。我在新闻组中读到，最好的方法是使用MemoryStream。我试过了，但是在创建Image时我总是得到一个例外（在system.drawing.dll中发生了一个未处理的类型
''System.ArgumentException''例外。附加
信息： Ungültiger参数verwendet）。这是我的代码：

图像newImage;
使用（MemoryStream ms = new MemoryStream（length））
{
byte [] bArray = new byte [length] ;
for（int k = 0; k< length; k ++）
{
bArray [k] = 10;
}
ms.Write（bArray，0 ，长度）;
newImage = Image.FromStream（ms）;
}

感谢您的帮助！
Arno

Lebesgue< no **** @ spam.jp>写道：

你必须先设置流的位置，然后再将其传递给Image
构造函数。
ms.Position = 0;

在这种情况下你还必须*不*使用using语句 - 否则
否则流将自动关闭。 Image.FromStream

要求流保持打开状态，直到*它*想关闭它。


-

Jon Skeet - < sk *** @ pobox.com>
http：// www .pobox.com / ~silet 博客： http：//www.msmvps .com / jon.skeet

如果回复小组，请不要给我发邮件

感谢您的帮助到目前为止...我做了更改，您（两个）告诉我，

但我仍然得到相同的异常（System.ArgumentException）。 ..

我的代码现在看起来像这样：

Image newImage;

MemoryStream ms = new MemoryStream（length）;

byte [] bArray = new byte [length];

for（int k = 0; k< length; k ++）

{

bArray [k] = 10;

}

ms.Write（bArray，0，length）;

ms .Position = 0;

新Image = Image.FromStream（ms）;


谢谢，

Arno

Lebesgue<否**** @ spam.jp>写道：

你必须先设置流的位置，然后再将其传递给Image
构造函数。
ms.Position = 0;

在这种情况下，您还必须*不*使用using语句 - 否则，流将自动关闭。 Image.FromStream
要求流保持打开，直到*它*想关闭它。

Hi,

I want to convert a byte[] to a Image. I read in a newsgroup that the
best way is to use a MemoryStream. I tried it, but I get always a
Exception while creating the Image(An unhandled exception of type
''System.ArgumentException'' occurred in system.drawing.dll. Additional
information: Ungültiger Parameter verwendet). Here is my code:

Image newImage;
using (MemoryStream ms = new MemoryStream(length))
{
byte[] bArray = new byte[length];
for(int k=0; k<length; k++)
{
bArray[k] = 10;
}
ms.Write(bArray,0,length);
newImage = Image.FromStream(ms);
}
}

Thanks for your help !
Arno

解决方案

You have to set stream''s position to start before passing it to the Image
constructor.
ms.Position = 0;

"Arno" <ki******@gmx.de> wrote in message news:e0**********@online.de...

Hi,

I want to convert a byte[] to a Image. I read in a newsgroup that the best
way is to use a MemoryStream. I tried it, but I get always a Exception
while creating the Image(An unhandled exception of type
''System.ArgumentException'' occurred in system.drawing.dll. Additional
information: Ungültiger Parameter verwendet). Here is my code:

Image newImage;
using (MemoryStream ms = new MemoryStream(length))
{
byte[] bArray = new byte[length];
for(int k=0; k<length; k++)
{
bArray[k] = 10;
}
ms.Write(bArray,0,length);
newImage = Image.FromStream(ms);
}
}

Thanks for your help !
Arno

Lebesgue <no****@spam.jp> wrote:

You have to set stream''s position to start before passing it to the Image
constructor.
ms.Position = 0;

You also have to *not* use a using statement in this case - as
otherwise the stream will be closed automatically. Image.FromStream
requires the stream to stay open until *it* wants to close it.

--
Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too

Hi,

thanks for your help so far ... I made the changes you (both) told me,
but I still get the same Exception (System.ArgumentException) ...
My code now looks like this:

Image newImage;
MemoryStream ms = new MemoryStream(length);
byte[] bArray = new byte[length];
for(int k=0; k<length; k++)
{
bArray[k] = 10;
}
ms.Write(bArray,0,length);
ms.Position = 0;
newImage = Image.FromStream(ms);

thanks,
Arno

Lebesgue <no****@spam.jp> wrote:

You have to set stream''s position to start before passing it to the Image
constructor.
ms.Position = 0;

You also have to *not* use a using statement in this case - as
otherwise the stream will be closed automatically. Image.FromStream
requires the stream to stay open until *it* wants to close it.

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