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DLL Talk / What is the HWND data type letter in dll stringtable?

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Skywriter
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Posted: 21st Jan 2010 18:03
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I just simply want to return a window handle in my dll so i can use it in other functions, but i cant figure out what letter i should use in the dll's string table or maybe some conversion is there to be done? Please help.

Sky
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Diggsey
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Posted: 21st Jan 2010 19:07
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Use L or D. DBPro doesn't have a HWND type so you have to use an integer or dword.


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Skywriter
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Posted: 21st Jan 2010 20:12
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Ok, so i have to perform a typecast like:
int createbutton()
{
button=CreateWindow(blah blah...);
return (int)button;
}
Is that correct?

Sky
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Rudolpho
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Posted: 21st Jan 2010 20:28
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Isn't HWND just a wrapper for DWORD, which in turn is equivalent to long?


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Skywriter
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Posted: 21st Jan 2010 20:38
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When i tried to return it like DWORD (without typecast) it generates an erron in compiler. It sais it cannot convert DWORD to HWND.

Sky
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Sven B
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Posted: 22nd Jan 2010 09:34 Edited at: 22nd Jan 2010 09:36
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DWORD Function()
{
HWND hWnd;
...
return (DWORD)hWnd;
}

And in the stringtable:
1, "Function[%L%Decorated%Description"

I don't see why it wouldn't work.
To retrieve data:

Function Use(DWORD handle)
{
HWND hWnd = (HWND)handle;
...
}

Cheers!
Sven B

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IanM
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Posted: 22nd Jan 2010 19:07
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Unnecessary - simply set the return type to a HWND and return a HWND, but keep the resource string as an L or D.

As long as the value you are returning is 4 bytes in size and not a float, this works perfectly well. It works just as well for input parameters too.

I do this all of the time in my plug-ins with no problem at all.

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Skywriter
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Posted: 23rd Jan 2010 09:49
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Yeah, that's correct IanM. Thereis no need for typecast. I was having trouble with function decorations, thats why i wasn't able to launch my functions from dll. I thought that letter was a mistake, but it's not. I usec extern"c" and all functions work well now without any need for decorations. Thanks for a good advice lads. Cheers

Sky
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