bb.EntityName error
Archives Forums/Blitz3D SDK Programming/bb.EntityName error
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| Can anyone help here? I've been creating a 3D map editor for a project im working on and hit a problem with the Blitz3DSDK, I'm using Visual C# (in VS2005 with a coupe of extra Lib's) - Ive tracked the problem down to the bb.EntityName command. I'm trying to get the name of the entity under the cursor, I can get the Entity ID / Number but when I try and convert this to the name of the entity the app throws a AccessViolationException error claiming I was trying to read or write to protected memory!! I would also point out that this ONLY happens if I run the app on windows VISTA! (32 or 64bit) and runs perfectly on XP (32 or 64bit) I have modified the sample source code to show the exception im getting (move the cursor over the block on the screen and it should crash) - just overwrite the program.cs code with:- using System; using bb = Blitz3DSDK; static class RotateCube { [STAThread] static void Main() { bb.BeginBlitz3D(); bb.Graphics3D(960, 540, 0, 2); int value = 0; string ename = ""; int cube = bb.CreateCube(0); int light = bb.CreateLight(1, 0); int camera = bb.CreateCamera(0); bb.EntityPickMode(cube, 3); bb.NameEntity(cube, "The-Cube"); bb.PositionEntity(camera, 0, 0, -4, 1); while (bb.KeyHit(bb.KEY_ESCAPE) == 0) { bb.UpdateWorld(1); bb.RenderWorld(0); bb.CameraPick(camera, bb.MouseX(), bb.MouseY()); value = bb.PickedEntity(); if (value != 0) { //ename = ToString(value); bb.Text(20, bb.GraphicsHeight() - 40, "Entity Name ="+value, 0, 0); ename = bb.EntityName(value); } bb.TurnEntity(cube, .1f, .2f, .3f, 1); bb.Text(20, bb.GraphicsHeight() - 20, "Blitz3DSDK C# Example (C)2007 Blitz Research 2007", 0, 0); bb.Flip(1); } bb.EndBlitz3D(); } } Any Help would be very much appreciated!! |
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| Hi, I have recently posted a bug report about the very same thing, I don't have anything other than Vista 32bit to test. So its a Vista thing eh! |
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| Monotonic, Yes it would seem so, I have no problems on xp at all! - just Vista, its a real pain. |
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| I might be stating the obvious here so i understand if i get flamed, but have you made sure your platform target is set to 'x86' in the project properties? |
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| Kale Kold, I'm not about to flame anyone - it was a good question - the project is set for x86, the application will run quite happily until it hits the EntityName command then it crashes with the error above. -Chaos |
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| I find it quite funny (in the loosest sense of the word) that it’s a function like EntityName that has issues with Vista. You would have thought a function that actually does something with DirectX or some low-level stuff would have issues. Its easily solved just by adding your own string Name, property, but it would be nice to be able to use the in-built one, but what ya gonna do. |
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| Monotonic, Could you elaborate on your work around? - when you say adding a string name property do you mean assinging a type value or something else? I need to be able to name entitys and read back their names so if you could post a workaround based say on the simple code snippet above that would be great Cheers - Chaos |
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| Sorry for the delay. What I do is create a class for my 3D objects, for instance:
class WorldObject
{
// The Blitz 3D object
public int Object
{
get {return m_n_object;}
} private int m_n_object;
// The name property
public string Name
{
get {return m_s_name;}
set {m_s_name = value;}
} private string m_s_name;
// other methods properties here, construction etc....
}
Obviously if creating a class for each object is a little too much overhead for your purposes then you could create a structure which is created on the stack which is faster access than classes which are created on the heap. Or you could even create a key-value array with the object pointer as the key and the name as the value. |
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| Monotonic, Ahhhhh.... I see, thanks for that, Ill have a play and see what I can do - till the bugs fixed anyway!! Cheers Chaos |
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