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dmonckton
Contributor
Joined: 09 Aug 2002
Posts: 117
Location: Lewes, U.K.
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 Posted: Thu Aug 13, 2009 3:25 pm Post subject: API returning a pointer |
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Hi
I've found a 3rd party MIDI API which might do everything I need? The only trouble is some of the functions return pointers to strings of info I need. I've got the function to work but how do I dereference the pointer in VDS?
Here's an example of one of the function I've got working...
| Code: |
LPCSTR MidiGetDeviceName(bool b_midiIn, DWORD dw_deviceNum); |
I get an integer which must point to the string containing the device name, how do I get to the string?
Thanks
David... |
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vdsalchemist
Admin Team
Joined: 23 Oct 2001
Posts: 1448
Location: Florida, USA
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| Posted: Thu Aug 13, 2009 3:32 pm Post subject: |
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David,
Have you tried this.
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%A = @lib(mididllname,MidiGetDeviceName,STR:,BOOL:%%b_midiIn,INT:%%dw_deviceNum)
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In the future if you could send a VDS example/attempt it would help. At the very least the name of the DLL your using.
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dmonckton
Contributor
Joined: 09 Aug 2002
Posts: 117
Location: Lewes, U.K.
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| Posted: Thu Aug 13, 2009 9:27 pm Post subject: |
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Thanks, your the man! Worked first time. The function names are a bit strange as they are "decorated". I have no idea what that means but I used http://www.dependencywalker.com/ to find the real function names.
Here's the test code
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loadlib e:\midictrl\midictrl.dll
%a = @lib(midictrl.dll,@chr(63)MidiGetNumDevices@chr(64)@chr(64)YAK@chr(95)N@chr(64)Z,INT:,BOOL:TRUE)
%b = @lib(midictrl.dll,@chr(63)MidiGetDeviceName@chr(64)@chr(64)YAPBD@chr(95)NK@chr(64)Z,STR:,BOOL:TRUE,INT:0)
freelib e:\midictrl\midictrl.dll
exit
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Thanks
David..
P.S. Did you ever write "The art of API programming with VDS 5". I would like to read it if you did. |
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