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DLL Talk / float isn't returning right! in VS C++ 2008

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G T R
18
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Joined: 26th Apr 2005
Location: Dubai, UAE
Posted: 5th Jun 2008 14:53
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I am using VS C++ 2008

the code in C++:


String Table:


DBP code:


Output:
start test
15
20
1082340096

as you can see the float should be 4.1
but it's returned 1082340096
what Iam doing wrong?
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IanM
Retired Moderator
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Joined: 11th Sep 2002
Location: In my moon base
Posted: 5th Jun 2008 14:56
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Ah, you mean that you aren't returning floats right.

ADD TWO FLOATS[%DFF%?Add_Two_Floats@@YAKMM@Z

should be

ADD TWO FLOATS[%FFF%?Add_Two_Floats@@YAKMM@Z

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jinzai
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Joined: 19th Aug 2006
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Posted: 5th Jun 2008 15:04 Edited at: 5th Jun 2008 15:06
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ADD TWO FLOATS[%FFF%?Add_Two_Floats@@YAKMM@Z

You still tell DBPro that the return type is a float. It is VC++ that you are trying to deceive.

IanM...Sorry, I'm doing too many things at once this morning.
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G T R
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Posted: 5th Jun 2008 15:11
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ahaaa ... now i got the idea
thank you guys
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Diggsey
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Joined: 24th Apr 2006
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Posted: 5th Jun 2008 20:15
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I know that you have to cast it to dword, but surely it makes no difference because it the same actual data, just in a different type. Are floats returned in a special way or something?

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Benjamin
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Joined: 24th Nov 2002
Location: France
Posted: 5th Jun 2008 20:57 Edited at: 5th Jun 2008 20:57
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Usually a float is returned in the ST(0) register (with the cdecl calling convention), but DBP expects them in EAX.

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