Visual Basic

Re: Problem in creating a new file format to store text and images

26-Jun-12 21:12

Hello everyone, currently I am working on a project, in which I have save some text, and images on disk in encrypted format (means no other application except mine may be able to read). But I have never worked before on such project (means creating a new file extension for some special purpose, on data encryption). So I am bit confused about it.

So can U please help me in this respect, or point me towards some good tutorial which can help me.
Thanks

Richard MacCutchan26-Jun-12 21:54

Richard MacCutchan

26-Jun-12 21:54

There is nothing special about creating files in your own format, all you need is to include some meta data or other pointers to show the type and length of each record. So for example your file type contains text and images you would do something like:

Create new binary stream file
Write header information
Do
    Write text identifier record: flag 0, length L
    Write L text characters
Repeat until all text is written
Do
    Write image identifier record: flag 1, length M
    Write M bytes of the image data
Repeat until all image data is written

Repeat as required for other content

Close file

When reading back you just use the identifier records to rebuild your text or image blocks in memory and display or otherwise process them as required.

speaking as ...

Re: Problem in creating a new file format to store text and images

Student1023027-Jun-12 20:50

Re: Problem in creating a new file format to store text and images

27-Jun-12 20:50

Thanks for the suggestion man, but can elaborate your code some more. How to use binary stream.

Richard MacCutchan27-Jun-12 22:14

Richard MacCutchan

27-Jun-12 22:14

Start here[^], also look at the StreamXxx classes. There is sample code in each section, none of which is very complicated, you just read and write Byte arrays to stream objects.

speaking as ...

Re: Problem in creating a new file format to store text and images

Student1023028-Jun-12 17:12

Re: Problem in creating a new file format to store text and images

28-Jun-12 17:12

Thanks man, It should help me.

Eddy Vluggen27-Jun-12 0:21

Eddy Vluggen

27-Jun-12 0:21

Alternatively, you could use a file-based database, like Sqlite.

Bastard Programmer from Hell Suspicious | :suss:

Re: Problem in creating a new file format to store text and images

Bernhard Hiller27-Jun-12 1:16

Bernhard Hiller

27-Jun-12 1:16

Create a folder, store all parts there in individual files. Then zip the folder, you may use a password for that. Change the extension to your own extension.
For opening the file, just reverse that process.
And do not forget to delete the folder after it was zipped, or after its contents were read.

Re: Problem in creating a new file format to store text and images

Student1023027-Jun-12 23:35

MS word like lile creater and viewer in vb.net

27-Jun-12 23:35

Thanks for this method its great.

But can u suggest some better method for this purpose. Means actually creating and registering a new file format.
Thanks

Student1023026-Jun-12 1:58

26-Jun-12 1:58

Hello everyone, I am a complete beginner to vb.net. I want to create a basic application, which can open and create files like ms word (which can contain formatted text, images and videos too).

I am a little confused that how to create it, means which control i should use, in which the file will be created and viewed. I am currently thinking about RichTextBox.

Can U give me some better suggestion, that how to go through this application, i am just in beginning stage.

Also please give some suggestion that how the files will be created (which can contain text, image, video).
Thanks.

Richard MacCutchan26-Jun-12 2:09

Richard MacCutchan

26-Jun-12 2:09

If you want to read MSWord files then you will need to learn about the Microsoft.Office.Interop.Word[^] namespace. You could also try looking through some of the VB.NET articles[^] for samples which will help you.

speaking as ...

Nick Otten26-Jun-12 2:12

Nick Otten

26-Jun-12 2:12

Hello,

making a word file while using a vb.net application inst really that easy (specially when you want to use more then just text).

for a control i would really know, a ritch textbox doenst support video, and im not to sure about images and outlining either.

for the code to get the stuff into a .doc(x) file and back i would recommend to read this[^] article. mind you that you need a office client installed to use that sort of code.

Student1023026-Jun-12 2:15

26-Jun-12 2:15

Actually, i have nothing to do with MS word (i mean just like MS word). I want to create a application which will provide a editing area to user, where one can create a formatted text file, add images, videos. Save them on disk and later re-open them when needed.

But i am confused that a how to start, which control to use and how to store them in fie.

I just need some suggestions that how to go through project, i need some basic ideas and tips,so that i can continue.

Nick Otten26-Jun-12 3:56

Nick Otten

26-Jun-12 3:56

Not sure if its an idea, but what if you used a webbrowser control and make it so your application can write html code.

that way a user can create a file, your program writes a html file (and store the movies/images) witch it can read later on again. that way you don't have to worry about how you want to store the outlining of your file.

if you dont want to use HTML, then i don't really know how you might do this. I'm afraid you have to make your own control/look on the internet for a downloadable control to do it.

fillby criteria

Hameed Qasim25-Jun-12 8:45

Hameed Qasim

25-Jun-12 8:45

how to pass criteria in fillby Blush | :O

Re: fillby criteria

Dave Kreskowiak25-Jun-12 11:28

Dave Kreskowiak

25-Jun-12 11:28

You might want to provide quite a bit more detail about what you're doing and what you're using. What object are you calling "Fillby" on??

A guide to posting questions on CodeProject[^]

Dave Kreskowiak

Re: fillby criteria

Student1023026-Jun-12 2:12

How to create DLL Library for VBA(Excel 2010)

26-Jun-12 2:12

wrongly posted. sorry

Re: fillby criteria

Luc Pattyn25-Jun-12 11:57

Luc Pattyn

25-Jun-12 11:57

inside parentheses.

Big Grin | :-D

Luc Pattyn [My Articles] Nil Volentibus Arduum

konarex81225-Jun-12 3:46

konarex812

25-Jun-12 3:46

Hello,
I need to create DLL library for Microsoft Excel 2010.
Anybody now how to create?

I try in Visual Studio 2010 but have error in VBA when I add reference.
Maybe I need different software for that?

ZurdoDev25-Jun-12 3:56

ZurdoDev

25-Jun-12 3:56

You need to be more clear to what you want. What exactly do you want?

There are only 10 types of people in the world, those who understand binary and those who don't.

konarex81225-Jun-12 4:04

konarex812

25-Jun-12 4:04

I need only information:
How to create simple dll library for VBA.

Example

Public Class Example1
Public Const data As String = "code123"
End Class

How to compile that and use in VBA - Excel?
I try everything and all dont working...

ZurdoDev25-Jun-12 4:12

ZurdoDev

25-Jun-12 4:12

In VBA, click on Tools, References, and browse to your dll. You'll have to create your dll in Visual Studio first or some other tool.

There are only 10 types of people in the world, those who understand binary and those who don't.

Dave Kreskowiak25-Jun-12 5:21

Dave Kreskowiak

25-Jun-12 5:21

Your library, if written in C# or VB.NET, must be written to be COM-exposed.

Here's[^] a pretty good starting article.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak

konarex81226-Jun-12 21:02

konarex812

26-Jun-12 21:02

Hello.
I try that - Register COM interlop and Make visible COM... in Visual Studio 2010.
Don`t working.
When I add reference in VBA, I have error.

Can`t add a reference to the specified file