Object to binary[] from COM in .NET using C#

**Mattias Sjögren** · Nov 16 '05, 03:28 AM

Re: Object to binary[] from COM in .NET using C#

[color=blue]
>Now how can I obtain a byte[] out of this returned Object to pass it to
>Response.Write ?!
>I can't cast into an array, of course,[/color]

Why not? What's the actual type of the returned object
(obj.GetType(). ToString())?

Mattias

--
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**A. Gharbeia** · Nov 16 '05, 03:28 AM

Re: Object to binary[] from COM in .NET using C#

Thank you for your response, Mattias.

Using .GetType().ToSt ring() directly on the reference returned by System.Type.Inv okeMember() (i.e. without first assigning it to an object), returns System.Byte[*].

However, passing this reference also directly to "Response.Binar yWrite()" (i.e. by placing the whole InvokeMember call within the parentheses), yields:

Compiler Error Message: CS1502: The best overloaded method match for 'System.Web.Htt pResponse.Binar yWrite(byte[])' has some invalid arguments

I also tried assigning the reference to an Object object and using System.Convert. ChangeType(obje ct, invocation.GetT ype()) to convert object to the type returned by the invocation and do InvokeMember() once more, this time assigning the returned reference to object. And I got the same error!!

"Mattias Sjögren" <mattias.dont.w ant.spam@mvps.o rg> wrote in message news:%23KCvYBIL EHA.1120@TK2MSF TNGP11.phx.gbl. ..[color=blue]
> [color=green]
> >Now how can I obtain a byte[] out of this returned Object to pass it to
> >Response.Write ?!
> >I can't cast into an array, of course,[/color]
>
> Why not? What's the actual type of the returned object
> (obj.GetType(). ToString())?
>
>
>
> Mattias
>
> --
> Mattias Sjögren [MVP] mattias @ mvps.org
> http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
> Please reply only to the newsgroup.[/color]

**A. Gharbeia** · Nov 16 '05, 03:28 AM

Re: Object to binary[] from COM in .NET using C#

One more thing:
Doing the whole thing in JScript.NET is much easier and straighforward,
since calling the COM methods doesn't neccessate using Type.InvokeMemb er.
However, attempting to output the result to the HTTP stream using
Response.Binary Write yields a similar error:

System.InvalidC astException: Specified cast is not valid.

A. Gharbeia

"A. Gharbeia" <ahmad@heia.org > wrote in message
news:uCAnEiILEH A.2716@tk2msftn gp13.phx.gbl...
Thank you for your response, Mattias.

Using .GetType().ToSt ring() directly on the reference returned by
System.Type.Inv okeMember() (i.e. without first assigning it to an object),
returns System.Byte[*].

However, passing this reference also directly to "Response.Binar yWrite()"
(i.e. by placing the whole InvokeMember call within the parentheses),
yields:

Compiler Error Message: CS1502: The best overloaded method match for
'System.Web.Htt pResponse.Binar yWrite(byte[])' has some invalid arguments

I also tried assigning the reference to an Object object and using
System.Convert. ChangeType(obje ct, invocation.GetT ype()) to convert object to
the type returned by the invocation and do InvokeMember() once more, this
time assigning the returned reference to object. And I got the same error!!

"Mattias Sjögren" <mattias.dont.w ant.spam@mvps.o rg> wrote in message
news:%23KCvYBIL EHA.1120@TK2MSF TNGP11.phx.gbl. ..[color=blue]
>[color=green]
> >Now how can I obtain a byte[] out of this returned Object to pass it to
> >Response.Write ?!
> >I can't cast into an array, of course,[/color]
>
> Why not? What's the actual type of the returned object
> (obj.GetType(). ToString())?
>
>
>
> Mattias
>
> --
> Mattias Sjögren [MVP] mattias @ mvps.org
> http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
> Please reply only to the newsgroup.[/color]

**Mattias Sjögren** · Nov 16 '05, 03:28 AM

Re: Object to binary[] from COM in .NET using C#

[color=blue]
>Using .GetType().ToSt ring() directly on the reference returned by System.Type.Inv okeMember() (i.e. without first assigning it to an object), returns System.Byte[*].[/color]

In that case you should be able to cast it to System.Array and access
the array items with Array.GetValue( ).

Mattias

--
Mattias Sjögren [MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
Please reply only to the newsgroup.

**A. Gharbeia** · Nov 16 '05, 03:29 AM

Re: Object to binary[] from COM in .NET using C#

Yes.
But this will mean I will have to access the Array elements one by one!
Then what?

"Mattias Sjögren" <mattias.dont.w ant.spam@mvps.o rg> wrote in message
news:Oc$RizILEH A.3324@TK2MSFTN GP10.phx.gbl...[color=blue]
>[color=green]
> >Using .GetType().ToSt ring() directly on the reference returned by[/color][/color]
System.Type.Inv okeMember() (i.e. without first assigning it to an object),
returns System.Byte[*].[color=blue]
>
> In that case you should be able to cast it to System.Array and access
> the array items with Array.GetValue( ).
>
>
>
> Mattias
>
> --
> Mattias Sjögren [MVP] mattias @ mvps.org
> http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
> Please reply only to the newsgroup.[/color]

**A. Gharbeia** · Nov 16 '05, 03:29 AM

Re: Object to binary[] from COM in .NET using C#

I tried:

Object o = ImagingComponen t.InvokeMember( "JPGData",
BindingFlags.Ge tProperty, null, certificateImag e, null);
Array b = Array.CreateIns tance(typeof(by te), ((Array)o).Long Length);
b.CopyTo(b, 0);
Response.Binary Write(b);

and got the same compiler error:

CS1502: The best overloaded method match for
'System.Web.Htt pResponse.Binar yWrite(byte[])' has some invalid arguments

"Mattias Sjögren" <mattias.dont.w ant.spam@mvps.o rg> wrote in message
news:Oc$RizILEH A.3324@TK2MSFTN GP10.phx.gbl...[color=blue]
>[color=green]
> >Using .GetType().ToSt ring() directly on the reference returned by[/color][/color]
System.Type.Inv okeMember() (i.e. without first assigning it to an object),
returns System.Byte[*].[color=blue]
>
> In that case you should be able to cast it to System.Array and access
> the array items with Array.GetValue( ).
>
>
>
> Mattias
>
> --
> Mattias Sjögren [MVP] mattias @ mvps.org
> http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
> Please reply only to the newsgroup.[/color]

**Mattias Sjögren** · Nov 16 '05, 03:29 AM

Re: Object to binary[] from COM in .NET using C#

[color=blue]
>Yes.
>But this will mean I will have to access the Array elements one by one!
>Then what?[/color]

Not necessarily, you should be able to copy the contents over to a
regular byte[] using Buffer.BlockCop y().

Mattias

--
Mattias Sjögren [MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
Please reply only to the newsgroup.

**A. Gharbeia** · Nov 16 '05, 03:29 AM

Re: Object to binary[] from COM in .NET using C#

Although I don't know how to create a byte[] with a dynamic size (that will
only be known at runtime), I tried:

Object r = ImaginCOM.Invok eMember("JPGDat a", BindingFlags.Ge tProperty,
null, certificateImag e, null);
byte[] b;
Buffer.BlockCop y( ((Array)r), 0, b, 0, ((Array)r).Leng th );

and got:

CS0154: The property or indexer 'System.Web.UI. Page.Buffer' cannot be used
in this context because it lacks the get accessor

I'm trying this and other tricks with JScript.NET in addition to C#. I with
I could find a solution in JScript.NET, as the code there is much cleaner. I
tried to play on the JScript Array/.NET System.Array duality but reached no
where either.

"Mattias Sjögren" <mattias.dont.w ant.spam@mvps.o rg> wrote in message
news:eMmxhVJLEH A.1644@TK2MSFTN GP09.phx.gbl...[color=blue]
>[color=green]
> >Yes.
> >But this will mean I will have to access the Array elements one by one!
> >Then what?[/color]
>
> Not necessarily, you should be able to copy the contents over to a
> regular byte[] using Buffer.BlockCop y().
>
>
>
> Mattias
>
> --
> Mattias Sjögren [MVP] mattias @ mvps.org
> http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
> Please reply only to the newsgroup.[/color]

**A. Gharbeia** · Nov 16 '05, 03:29 AM

Re: Object to binary[] from COM in .NET using C#

Although I don't know how to create a byte[] with a dynamic size (that will
only be known at runtime), I tried:

Object r = ImaginCOM.Invok eMember("JPGDat a", BindingFlags.Ge tProperty,
null, certificateImag e, null);
byte[] b;
Buffer.BlockCop y( ((Array)r), 0, b, 0, ((Array)r).Leng th );

and got:

CS0154: The property or indexer 'System.Web.UI. Page.Buffer' cannot be used
in this context because it lacks the get accessor

I'm trying this and other tricks with JScript.NET in addition to C#. I with
I could find a solution in JScript.NET, as the code there is much cleaner. I
tried to play on the JScript Array/.NET System.Array duality but reached no
where either.

What do you think?

A. Gharbeia

"Mattias Sjögren" <mattias.dont.w ant.spam@mvps.o rg> wrote in message
news:eMmxhVJLEH A.1644@TK2MSFTN GP09.phx.gbl...[color=blue]
>[color=green]
> >Yes.
> >But this will mean I will have to access the Array elements one by one!
> >Then what?[/color]
>
> Not necessarily, you should be able to copy the contents over to a
> regular byte[] using Buffer.BlockCop y().
>
>
>
> Mattias
>
> --
> Mattias Sjögren [MVP] mattias @ mvps.org
> http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
> Please reply only to the newsgroup.[/color]

**Mattias Sjögren** · Nov 16 '05, 03:29 AM

Re: Object to binary[] from COM in .NET using C#

[color=blue]
>CS0154: The property or indexer 'System.Web.UI. Page.Buffer' cannot be used
>in this context because it lacks the get accessor[/color]

The code looks correct, you just got the wrong Buffer class. Make it

System.Buffer.B lockCopy( ...

Mattias

--
Mattias Sjögren [MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
Please reply only to the newsgroup.

**A. Gharbeia** · Nov 16 '05, 03:30 AM

Re: Object to binary[] from COM in .NET using C#

that same code from the past post with System.Buffer results in:

CS0165: Use of unassigned local variable 'b'

From what I understand, arrays in C# aren't dynamic and have to be
dimensioned and initialised before use.

"Mattias Sjögren" <mattias.dont.w ant.spam@mvps.o rg> wrote in message
news:ecfcYQKLEH A.2388@TK2MSFTN GP09.phx.gbl...[color=blue]
>[color=green]
> >CS0154: The property or indexer 'System.Web.UI. Page.Buffer' cannot be[/color][/color]
used[color=blue][color=green]
> >in this context because it lacks the get accessor[/color]
>
> The code looks correct, you just got the wrong Buffer class. Make it
>
> System.Buffer.B lockCopy( ...
>
>
>
> Mattias
>
> --
> Mattias Sjögren [MVP] mattias @ mvps.org
> http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
> Please reply only to the newsgroup.[/color]

**Mattias Sjögren** · Nov 16 '05, 03:33 AM

Re: Object to binary[] from COM in .NET using C#

[color=blue]
>that same code from the past post with System.Buffer results in:
>
>CS0165: Use of unassigned local variable 'b'[/color]

Well you have to instantiate the byte array first.

byte[] b = new byte[((Array)r).Leng th];

Mattias

--
Mattias Sjögren [MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
Please reply only to the newsgroup.

**A. Gharbeia** · Nov 16 '05, 03:36 AM

Re: Object to binary[] from COM in .NET using C#

Thank you very much Mattias.
That did it.
I thought I tried that before, but it seems I did something wrong.

I hope you don't mind me asking another question: Is the reflection part
required in ASP.NET C#, or is there a way to add a reference to the COM
object so I can do away with the extra code.

Ahmad Gharbeia

**Carter** · Nov 16 '05, 03:41 AM

Re: Object to binary[] from COM in .NET using C#

Question for A. Gharbeia: do you always know what sort of object you are getting back from your InvokeMember call
For instance, why not cast your original example to an Image instance

Image tImage = (Image) TImagingObject. InvokeMember("J PGData", BindingFlags.Ge tProperty, null, certificateImag e, null)

2 of the overloaded Image.Save() methods allow you to perist the image as a Stream

Stream tImageByteStrea m = new Stream()
tImage.Save(tIm ageByteStream, ImagingFormat.J peg)

and so on and so forth..

Object to binary[] from COM in .NET using C#

Object to binary[] from COM in .NET using C#

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