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Date Posted: 17:33:59 04/04/02 Thu
Author: Michel
Subject: Re: Internet Browser an plug-in
In reply to: Gerson Guerios 's message, "Re: Internet Browser an plug-in" on 15:37:13 04/04/02 Thu


Hi Gerson,

If this is a single page file, use

LoadFromStream (stream, ' .tif ', 1);

instead of 0 for the last parameter.

0 is used to load all images in memory from a multipage file.

The other possibility is that the file is corrupt.

Best regards,

Michel
>Hi Michel
>
>I thank your information.
>
>I am using a function to download the file from server
>to browser. It is working very well.
>
>But, it remains a problem.
>
>Before the exhibition of the file an exception is
>generated (EEnvisionError) with the following message:
>
> ' Frame 1 does not exist' !!
>
>You could help me.
>
>Best regards,
>Gerson
>
>>
>>Hi Gerson,
>>
>>I don't have any experience with this. One thing is
>>sure, TMemoryStream.LoadFromFile expects a file on the
>>file system, not a http link.
>>
>>You cannot load a file given an http link. I am not
>>sure what you intent is. If this is really a file
>>located on a web server, you would need a http client
>>to get the file from the server first.
>>
>>Best regards,
>>
>>Michel
>>
>>
>>
>>
>>>Hi Michel
>>>I am developing an ActiveX with the purpose of
>showing
>>>images in browser.
>>>
>>>Question:
>>>
>>>how to open a file using http?
>>>
>>>Example:
>>>var
>>> stream: TMemoryStream;
>>>begin
>>> ffileName := '<a rel=nofollow target=_blank href="http://asp007/chapter1.tif';">http://asp007/chapter1.tif';</a>
>>>
>>>
>>> BeginHourglass;
>>> try
>>> stream := TMemoryStream.Create;
>>> stream.LoadFromFile (ffileName);
>>> PageUpDown.Min := 1;
>>> imageScrollBox.AntiAliased := True;
>>> imageScrollBox.LoadFromStream (stream, ' .tif ',
>>>0);
>>> pageUpDown.Max := imageScrollBox.FrameCount;
>>> PageEdit.Text := ' 1 ';
>>>
>>> finally
>>> EndHourglass;
>>> end;
>>>
>>> FDirty := False;
>>>
>>>/ / ZoomEditChange(Self);
>>>
>>> Result := True;
>>>end;
>>>
>>>Message comes back informing error when opening the
>>>file!
>>>
>>>Could it help me?
>>>
>>>Gerson
>>>>
>>>>Hi Gerson,
>>>>
>>>>I am not familiar with the programming of plugins.
>>>>Envision would be able to help to read the files,
>but
>>>>you'll need information on how to create the
>plugins.
>>>>
>>>>In IE, you could create an ActiveX, but I tend to
>>stay
>>>>away from these as much as possible.
>>>>
>>>>Best regards,
>>>>
>>>>Michel
>>>>
>>>>>Michel
>>>>>
>>>>>I would like to build an application to visualize
>>>>>images in Internet Browser, using the language
>>>Delphi.
>>>>>
>>>>>
>>>>>How can I use ' Envision Image Library' in a
>program
>>>'
>>>>>plug-in '?

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