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DLL Talk / [Problem] - Making TPC with PureBasic with Object Position Problem

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MikeK
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Posted: 2nd Jan 2009 22:19 Edited at: 3rd Jan 2009 06:10
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Hey all,

Just a quick request for help on creating a TPC with PureBasic and getting a specified object's position;

The following procedures I have (as well as the InvokeCorePtr,etc) to get an objects are;



Now when another procedure (defined as CDLL to be used in dbpro) in the TPC code attempts to get an object's position (that does exist in the 3d space), all 3 procedures return '0'..?

When changing the function called from "?GetXPosition@@YAMH@Z" to "?GetXSize@@YAKH@Z", It works fine...

Anyone have any idea's?

Thanks

Mikey

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IanM
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Posted: 4th Jan 2009 01:56
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Ok, I think I might take a shot at this one.

Correct me if I'm wrong, but you are storing the result of the call to GetXPosition in a 'long'. Then you are converting it to a float. Then you are passing back the float.

If that's the case, then don't bother converting to a float - just pass back the 'long'.

DBPro requires you to pass back floats as if they were DWORD values, or in your case 'long' values.

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MikeK
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Posted: 4th Jan 2009 02:19
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The result of the returns a constant value, which to me indicates a handle to a memory allocation storing the value, but I have tried just using the returned value from the call, peeking a long/dword from the call, and a float, but nothing seems to want to give me the location of the object in 3d space...

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IanM
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Posted: 4th Jan 2009 12:10
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I've taken a closer look at the functions available.

What I said applies to ?GetXPositionEx@@YAKH@Z - it returns a float held within a DWORD.

You are using ?GetXPosition@@YAMH@Z - that returns a straight float value that you may be able to use directly.

I know that the first one works correctly as I use it myself and DBPro uses it (the OBJECT POSITION X maps to it). You'll need to test yourself to see if the one that you use works correctly, but I don't see why it shouldn't.

Utility plug-ins collection (updated 29/12/08) and
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MikeK
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Posted: 4th Jan 2009 15:57
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Hey again, (sorry for being a pain in the ass lol)

Right, IanM, using the Get Position Ex call works fine, it returns a value that actually changes when the object's position changes;

One more question though;

The value returned with the Get Position Ex returns quite a high figure, which isn't at all expected... I'll explain;


Say I make a cube primitive of 100 pixels in size, and position it 100, 100, 100 - When using the Get Position Ex call, for the X position (only axis tested so far) it returns '1120403456' as the value... Which obviously isn't expected...

Is there a solution to correcting these values? or am I going to have to make do with that?

Thankyou so much again

Mikey

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IanM
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Posted: 4th Jan 2009 16:28
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That's the binary value for the float value of 100. Now all you need to do is pass that back to DBPro using a DWORD return type, but tell DBPro that the parameter is of type 'F' for float.

Unfortunately, I can't tell you how to do that in PureBasic because I don't know the language. If you were using C or C++ I'd have already shown you what to do with code.

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MikeK
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Posted: 4th Jan 2009 20:28 Edited at: 4th Jan 2009 20:29
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That's great,

Works perfectly now

Thankyou kindly, Ian


- For any other PB users who may be stuck on the same problem;

The way to extract the Float from the Dword, is to use PeekF then to use the Handle of the variable.

I.e.




Thanks again

Mike

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