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DLL Talk / Call Dll with Float As Int

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KuRiX
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Posted: 2nd Feb 2007 14:16
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Hi.

I have created a dll, that takes 2 float parameters and returns one float.

The problem is that if i call the dll with 2 integers instead of floats, there is no automatic casting... and the result is wrong...

I think this is a problem because i must be very carefull when calling the dll.

I use load dll and call dll.

Any help?, thanks

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CattleRustler
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Posted: 2nd Feb 2007 16:29
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doesnt the dll code cast the arguments to floats?
like if you pass in 9 from dbp code, wouldnt the dll treat it as 9.0F ?

can you post the dbp code that makes the call, and some of the dll code (func def) might help too.

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empty
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Posted: 2nd Feb 2007 16:38
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When you use CALL DLL the parameters are kind of a variant type as it has no way to determine what parameter types the DLL function expects. So it can't cast the type automatically.

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IanM
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Posted: 2nd Feb 2007 18:48
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To state what Empty said another way, it's your responsibility to ensure that the correct data type is passed to your DLL.

The safest way I've found to do this is to ensure that you don't call your DLL function directly, but wrap it in a small function that has the correct parameter types, and call that function instead. That way, the values are cast to the correct type automatically.

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KuRiX
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Posted: 3rd Feb 2007 01:11
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I like the wrapping method, thanks. I only hope that this will not affect speed too much. Thanks !

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