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Help with a code (beginner)

This is a discussion on Help with a code (beginner) within the C Programming forums, part of the General Programming Boards category; Hi! I am new at c programming and need some help... Its involve images stored on disk in a bitmap ...

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    Help with a code (beginner)

    Hi!

    I am new at c programming and need some help... Its involve images stored on disk in a bitmap in TGA format. I am not shore if how much i need to explain, i post a part of the file and hope someone can explain a solution...

    http://i45.tinypic.com/fyhc15.png (the 0x30 you need to convert to binary format)

    And this you need to complete the code.

    http://i49.tinypic.com/1zbr41.png

    i really need help...


    Sorry for the language...

  2. #2
    and the hat of wrongness Salem's Avatar
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    So how much of a "beginner" are you?

    The kind of beginner that did "hello world" this morning, and now you're tackling image format conversion?

    Or are you at a stage where you're comfortable with fopen / fread etc and just need a bit of a nudge towards your goal?
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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    Quote Originally Posted by Salem View Post
    So how much of a "beginner" are you?

    The kind of beginner that did "hello world" this morning, and now you're tackling image format conversion?

    Or are you at a stage where you're comfortable with fopen / fread etc and just need a bit of a nudge towards your goal?
    I can handle fopen fread and so, but i am not a expert... So how about 0x30 in binary format? is it just 00110000 or 000110000? And why?

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    qny
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    How would you convert the binary value 111 to decimal? 00000000000000000007 or 00000000000000007?
    dennis.cpp likes this.

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    Quote Originally Posted by qny View Post
    How would you convert the binary value 111 to decimal? 00000000000000000007 or 00000000000000007?
    I would convert it to 7. But i still don't know how to write 0x30 is it 110000? The 0x don't do anything or what?

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    But why should i convert hex 0x30 to bin 110000?

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    Programming Wraith GReaper's Avatar
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    Quote Originally Posted by LK93 View Post
    But why should i convert hex 0x30 to bin 110000?
    You could convert it to 00110000.0000 if you wanted, but what's the point? Extra zeros are discarded because they are insignificant.

    EDIT: It's like saying "Should I write seven as 7.0 or 7.00?" Say what?!
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    Quote Originally Posted by GReaper View Post
    You could convert it to 00110000.0000 if you wanted, but what's the point? Extra zeros are discarded because they are insignificant.

    EDIT: It's like saying "Should I write seven as 7.0 or 7.00?" Say what?!
    Okej, but why should i convert it from 0x30 to 110000? What happens in the code?

    And what does TGA_FLIP_MASK means?

    I am really sorry for my questions, i know i sound retarded but i am just trying to get it...
    Last edited by LK93; 09-23-2012 at 02:57 PM.

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    Programming Wraith GReaper's Avatar
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    Quote Originally Posted by LK93 View Post
    Okej, but why should i convert it from 0x30 to 110000? What happens in the code?
    You don't convert anything. You just print it on a different base. Everything in the code is encoded to binary.

    Quote Originally Posted by LK93 View Post
    And what does TGA_FLIP_MASK means?
    Wow, I simply don't know and can't find any info on that!
    [wild_guess] It's a preprocessor constant for Targa image files to get if the image should be flipped or not, through a bitfield [/wild_guess]
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    Quote Originally Posted by GReaper View Post
    You don't convert anything. You just print it on a different base. Everything in the code is encoded to binary.


    Wow, I simply don't know and can't find any info on that!
    [wild_guess] It's a preprocessor constant for Targa image files to get if the image should be flipped or not, through a bitfield [/wild_guess]
    Okey, thanks!

    For some reasons i don't want to post the entire code here... I know this is much to ask for, but do you have time to help me with the code on email or some chat function?

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    I'd say study up on what it is that you want to do with the data, and then post the smallest example of it that you can, for code -- not your current whole program.

    Changing formats is bogus - it's like changing from a whitewall to a blackwall, tire, which are otherwise identical, and expecting your car to accelerate faster, somehow.

    OK, that analogy isn't nearly as good as GReaper's, but let's move on.
    Last edited by Adak; 09-24-2012 at 12:21 AM.

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