Get all values from a struct

This is a discussion on Get all values from a struct within the C++ Programming forums, part of the General Programming Boards category; I made a function in a cpp file that needs to get a float value that is declared and defined ...

  1. #1
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    Get all values from a struct

    I made a function in a cpp file that needs to get a float value that is declared and defined in different cpp files and is inside a struct.

    It's a directX program I'm making, and I can get the LPDIRECT3DRMFRAME value just fine, but it doesn't know what the other float values are that are inside that same struct. It says one of them is -1.0737418e+008 when I declared it as 1.1. How do I tell my program where to find the value of this number?

    The struct is

    frFrame.frFrame
    .Weight (It can't tell what this is)
    .Bounce (It can't tell what this is)

  2. #2
    Frequently Quite Prolix dwks's Avatar
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    A debugger can show all the values in all your variables, including structs. I would first find out what types .Weight and stuff are, and then you can deal with them.
    dwk

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    i know what types they are, floating points.

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    >and I can get the LPDIRECT3DRMFRAME value just fine,
    How are you getting this value? Something like:
    Code:
    cout << frFrame.frFrame
    Probably not since it's directX.

    Also have you tried changing the value of frFrame, just to be sure you are getting what you think?

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    Heres my function

    Code:
    void Phy_Weight(LPDIRECT3DRMFRAME frScene, LPDIRECT3DRMFRAME Camera){
    LPDIRECT3DRMFRAMEARRAY SceneArray;
    FrameStruct frFrame;
    D3DVECTOR vectPos;
    D3DVECTOR vectVel;
    
    int ArraySize;
    
    frScene->GetChildren(&SceneArray);
    ArraySize = SceneArray->GetSize();
    
    	for (int i = 0;i < ArraySize; i++){
    	SceneArray->GetElement(i, &(frFrame.frFrame));
    	frFrame.frFrame->GetVelocity(frScene, &vectVel, false);
    	if (frFrame.frFrame != Camera){
    	frFrame.frFrame->SetVelocity(frScene, vectVel.x, vectVel.y * frFrame.Weight, vectVel.z, false);
    	}
    	}
    }
    Ill break it down for you in case you don't know DX coding.

    First I tell the user defined scene frame (frScene) to get all the frames inside it and put them into an array of frames.

    Next I make the integer ArraySize become the size of the array of frames

    With that info I can start a for loop. Inside the for loop I tell the array to get all of its frames and put them into frFrame.frFrame. This is where it finds out what .frFrame is. But I have no clue how to tell it where to find .Weight and .Bounce.

  6. #6
    vae victus! skorman00's Avatar
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    I don't see that frFrame struct being initialized anywhere. I suspect it's being done here:
    Code:
    SceneArray->GetElement(i, &(frFrame.frFrame));
    but you're sending the frFrame member of frFrame, so anything else in the top level frFrame is probably still chode...unless you know the byte offsets of all the members and do some pointer math, but that's bad to do anyway.

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    > frFrame.frFrame->SetVelocity(frScene, vectVel.x, vectVel.y * frFrame.Weight, vectVel.z, false);

    Here you use frFrame.Weight. Is this the value that's showing as -1.0737418e+008 instead of 1.1?

  8. #8
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    Quote Originally Posted by swoopy
    > frFrame.frFrame->SetVelocity(frScene, vectVel.x, vectVel.y * frFrame.Weight, vectVel.z, false);

    Here you use frFrame.Weight. Is this the value that's showing as -1.0737418e+008 instead of 1.1?
    Correct, I just want to be able to access that variable, everything else works fine.

  9. #9
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    >Correct, I just want to be able to access that variable, everything else works fine.

    >FrameStruct frFrame;
    You declare frFrame here, so in order for Weight to have the value 1.1, you would have to either initialize it in the constructor, or call a setWeight member function. For example to initialize it in the constructor:
    Code:
    FrameStruct::FrameStruct(): Weight(1.1)
    {
    }
    Unless GetElement() sets it, which I doubt.
    Last edited by swoopy; 08-03-2005 at 07:47 PM.

  10. #10
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    Quote Originally Posted by swoopy
    >Correct, I just want to be able to access that variable, everything else works fine.

    >FrameStruct frFrame;
    You declare frFrame here, so in order for Weight to have the value 1.1, you would have to either initialize it in the constructor, or call a setWeight member function. For example to initialize it in the constructor:
    Code:
    FrameStruct::FrameStruct(): Weight(1.1)
    {
    }
    Unless GetElement() sets it, which I doubt.

    It looks there like you're setting the weight to 1.1, I dont want that. See I will have many frame structs, with many different weights, so I want it to find the weight variable that I declared in a different cpp. Also, the weight is subject to change at later times.

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    bump

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