Faq (Join the creation)

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Originally posted by NoteMe
Hmmm....so we have bad PC monitors...:(....thats not good.....OK....but it still needs to draw the white frame every other frame or soo...and That have too look weird on the screen. I can't understand anything else....And you have to make sure that the white frame is actually updated on the screen. So you have to have a high refreshrate on the monitor too. If not it might skip it....

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Using this

VB Code:

D3DWindow.SwapEffect = D3DSWAPEFFECT_COPY_VSYNC

Should help make sure the frame gets displayed. And yeah seems wierd, guess thats why nobody makes Light Guns for PC though :(.

Quote:

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Originally posted by NoteMe
Of course accuracy is importent. But as I said the reason it is not accurat is the same as for every counter in a interupt based OS like Windows. You will have context swtitches....;)....so you can't eliminate them at all. You can set the priority of the prosess higher, but there will still be context switching in your OS...;)

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Not totally sure on this one but it might be to do with it being hardware dependand but I think its accuracy is to do with hardware goings on that keep a counter based on the processors clock. Because he seemed to think your communicating directly with the Processor, however I don't know if he's been spending too much time playing with the GameCube Dev Kits ;)

Do you think that the logical width and height is it???


BTW I found it here...

http://netghost.narod.ru/gff/sample/code/gif/

And maybe we should add converting to other file formats under the same question..


BMP to JPEG:
http://vbforums.com/showthread.php?s...&highlight=gif

Quote:

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Originally posted by NoteMe
How to get the height and width of a file. The best way is always to read the header if you don't allready have the picture loaded in an image box, so the tutorial/example should read the heder og at least JPG/BMP and maybe GIF and PNG...

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found something on pscode. haven't looked at the code yet, but it sure sounds interesting!

http://www.pscode.com/vb/scripts/Sho...=9499&lngWId=1

Hehe..I never got that far to check there...thanks. I will have a look at it.


BTW did you get my PM anout the antialise tutorial of yours?

yes, i got it.
im probably gonna change some things and add a few more comments later tonight, then i might post it.

The JPEG check looks a bit weird...and the BMP was is a bit odd..:D:..but it is probably usefull. I have to test it a bit. Because there is so many diffrent JPEG compressions, so I can't understand that this will actually work.

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Originally posted by cyborg
yes, i got it.
im probably gonna change some things and add a few more comments later tonight, then i might post it.

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Sounds good. Just leave a message here and I will add it to the FAQ.

sure!

As I suspected, the code does not work on all types of JPEG. Like for Adobe Photoshop. So I will change that bit to my code, and the same with the BMP code.

OK...then I will leave for a week. Will be back on Sundy. Hope I took everything I needed with me home to make that tutorial about the image sizes.

Take care of this thread for me, while I am away. And keep questions comming.

I am trying to make the getsize of image tutorial so simple as possible here. But I have found one potential error. For some of the images you have to read a whole buch of the file to find the height and width of it. Lets say like 1kb, but some pictures are maybe not that big. So if you read a picture like this:

VB Code:

Open sFileName For Binary As iFN
    Get #iFN, 1, bBuf()
Close iFN

and bBuf is 1Kb and the picture is not. Do you then get an error? If so can anyone find a way to check the file size so the fixed amount of the file that you read are not bigger then the file....?? I don't have the time to test that now. Trying to strip down the code so it looks nice for the beginners here. Would appriciate if anyone looked it up for me.

Are you wanting to read the whole file in? In the case of filetypes which dont have set headers? Most of the file types I know of have a value in their header telling you the size of the file in total. For example bitmap headers:

VB Code:

Private Type BITMAPFILEHEADER
    bfType As Integer
    [b]bfSize As Long[/b]
    bfReserved1 As Integer
    bfReserved2 As Integer
    bfOffBits As Long
End Type
 
Private Type BITMAPINFOHEADER
    biSize As Long
    biWidth As Long
    biHeight As Long
    biPlanes As Integer
    biBitCount As Integer
    biCompression As Long
    biSizeImage As Long
    biXPelsPerMeter As Long
    biYPelsPerMeter As Long
    biClrUsed As Long
    biClrImportant As Long
End Type

Hehe....you ****...forget about the BMP file...I have done that part for 7 years now...I am talking about the JPEG standard ans so on....as I have said soooo many times there is no fixed point where the size of the size is in a JPG file. It can even hold the size for the thumbnail image in the JPG file it self...:D.....just listen to me, and answer me...will it give an error...:D

hehehe, I know you know bout BMP but I thought I'd use it as an example, doesn't the jpg have a file header at all? If not I have a way of getting the whole file in one byte array if ya want it. Will code it up now....

the jpeg has a header.. i think i have the source to a jpeg decoder somewhere on my hdd..

This should do the trick, isn't exactly super fast because it uses the redim everytime but its not that slow ;).

VB Code:

Dim tBuffer As Byte 'Tiny Buffer
Dim dBuf() As Byte
Dim i As Integer
 
    i = 0
    
    Open sFileName For Binary As 1
        Do
            'Get the next byte...
            Get #1, , tBuffer
            
            'Resize Buffer and add extra data...
            ReDim Preserve dBuf(0 To i)
            dBuf(i) = tBuffer
            i = i + 1
        Loop Until EOF(1)
    Close 1

Or this:

VB Code:

Dim dBuf() As Byte
 
    i = 0
    
    ReDim dBuf(0 To FileLen(sFileName))
    
    Open sFileName For Binary As 1
        Get #1, , dBuf()
    Close 1

Yeah, the last one could work. But I tried to open up a one pixel gif last night, with a 65k buffer, and it didn't give me an error. Looks like VB is looking after you....:D

maybe i miss the point but cant you just use filelen(Filename)

:confused:

Maybe I was tired and ove worked...:D....it was the same that Electroman suggested....;)....but it doesn't seem like VB care anyway...;)

Quote:

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Originally posted by kedaman
the jpeg has a header.. i think i have the source to a jpeg decoder somewhere on my hdd..

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Yeah it has some sort of header...but the point here is that the size of the image is not at a fixed point...so you can't read it as a BMP file....I am always right, stop saying anything else..:d

Quote:

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Originally posted by NoteMe
Yeah it has some sort of header...but the point here is that the size of the image is not at a fixed point...so you can't read it as a BMP file....I am always right, stop saying anything else..:d

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of course you can't read it like a bmp file, its not a bmp file you moron ;)

Now you are irritating me again...:D....what I mean is that the header of a JPG file is not static, and does not have a fixed length....the diffrent parts of the header is seperated by diffrent markers. And that is what you have to look for to get the right answer. What makes this even worse is that the same marked is used for the size of the thumbnail (if there is noe) and for the actual size, and it might be used for at least one more thing to, but I have no idea what that is, but I am 100% sure that it is not the size....I hat JPG...:D

hehe why don't you just use an existing jpeg library :D http://www.ploksoftware.org/docs/en/a00790.html

Hehe...first of all...that is a C library. And this is a VB tutorial. And second of all, I am making a tutorial on how to find it your self, and that big file would be to much of the good in this tutorial....but off Keda..:D

what a useless tutorial ;) I have the code in VB somewhere too, but whats the point in learning how to find it in JPEG files anyway ;)

So they can do it on their own for other formats...;)....and there has been 3 persons asking for diffrent file formats all ready this week..;)

I still think its useless ;)
theres a collection of fileformat info on wotsit.org i think

Yaeh and I am trying to teach them how to use it...and BTW try to read what they write about JPG there...:D...thats just plain fun...:

oh heck.. one of the most useless things I could ever think of is learning of fileformats :D

Just shut up..:D...and let me do my work...as long as people are asking questions, I will answer them...go over to CgitChatForums.com and stay there...;)

no way, its my duty to see that people don't learn any useless stuff here, if there are libraries available to do that then its just to use them ;)

Well...give me the links to the libraries for VB...and I can attach a link to it in my tutorial...;)

i have posted it somewhere on this forum a couple of years ago or so, just search for it ;)

You know I won't do that for you....I bet they will use my code in the tutorial anyway...so if you want it added. Then find it..;)

Here I am again...:D...there is so nearly finished tutorials on it's way, but I doubt that I have the time to finish them before June or something..:D


But I was thinking about an other thing. Would it be nice to have a "diictionary" for game expressions/math expression/computer expressions and so on in the faq. An example could be like this:



DX - DirectX

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A Graphics Library

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AGP - Accelerated Graphics Card

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a PCI based interface that was designed specially for the demands of 3D graphics applications. The 32-bit AGP channel directly links the graphics controller to the main memory. Although the channel runs at only 66Mhz, it supports data transmission during both the rising and falling ends of the clock cycle, yielding an effective speed pf 133MHz

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Quad Tree

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Blah blah blah

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And after each name and look up, there can be links called 1, 2, 3 and so on, to links to read more upon it.

What do you guys think?

Good idea :D

Nice but I think you'll need to put the definitions on a seperate page because it would take up loads of room, dont you think. Like say on your site you could do some php that will retrive definitions from your Db. That way in another thread when someone asks what something means you just put a link and they see the definition instead of needing to look though loads of others in the FAQ. What you think? If you dont want to use your site I'd be happy to do it as well.

It was a good idea...but I didn't think of using so much space on each definition. It was just ment to be short. And the links to tutorails/articels would show it in depth...I have no problem with using my site for it if you think that is a better solution. But I don't have the time to make that database before in June either...:D


We could start off using a new post or 2-3 in the FAQ and we could see later if we need to use a database. Or you or an other could make that database....If so, it should be possible for everyone to alter the explenation for the word or (can't remember what it is called when you only write the first letter, something on A..arbitueiueir, arbitrary, arbeid...no..can't remember..:D)