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dmonckton
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Joined: 09 Aug 2002
Posts: 117
Location: Lewes, U.K.
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 Posted: Thu Aug 06, 2009 10:58 am Post subject: C Arrays [Solved] |
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Hi
Can anyone tell me how to do the following in VDS. I'm trying to create an array of char's(bytes) but I don't want the members converted to binary. This is for a Windows API call.
The C code is this:
| Code: | unsigned char sysEx[] = {0xF0, 0x7F, 0x7F, 0x01, 0x02, 0xF7};
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If I do this:
| Code: | | %s = @binary(byte,$F0)@binary(byte,$7F)@binary(byte,$7F)@binary(byte,1)@binary(byte,2)@binary(byte,$F7) |
Will the contents of each byte be read incorrectly by the API function because they are in binary??
The other C way is this but its even more confusing!!
| Code: | | unsigned long buffer[] = { ((unsigned long)MEVT_LONGMSG<<24) | 7, 0x017F7FF0, 0x00F70201}; |
I've been trying to get this MIDI API to work for months and I'm very close to giving up for the first time ever!!
I really hope someone can help.
Thanks
David.
Last edited by dmonckton on Tue Aug 11, 2009 3:26 pm; edited 1 time in total |
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vdsalchemist
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Joined: 23 Oct 2001
Posts: 1448
Location: Florida, USA
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| Posted: Thu Aug 06, 2009 12:33 pm Post subject: |
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David,
The first C line and your VDS example are the same. They should give you the same value. Now for the second C line below please post the value for MEVT_LONGMSG which is probably a #define directive. I need this value since the code below is shifting it 24bits to the left then it performs a bitwise OR operation on the result of the left shift. The other two values are additional elements in the array of long called buffer. To create this buffer in VDS you would just need the following VDS code.
| Code: |
# The next line of code performs the following.
# unsigned long buffer[] = { ((unsigned long)MEVT_LONGMSG<<24) | 7, 0x017F7FF0, 0x00F70201};
# NOTE: You will need the SSBitwise VDS unit to do this. You can download it here
# http://forum.vdsworld.com/viewtopic.php?t=1860&start=0&postdays=0&postorder=asc&highlight=ssbitwise
%b = @BINARY(DWORD,@ssbitor(@ssbitlshift(%%MEVT_LONGMSG,24),7))@BINARY(DWORD,$01757550)@BINARY(DWORD,$00F70201)
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Notice that you will need the SSBitwise VDS unit to do this. There is also a couple of DLL's that can do the OR and Left Shift operations as well. %b should not be the same as buffer.
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dmonckton
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Joined: 09 Aug 2002
Posts: 117
Location: Lewes, U.K.
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| Posted: Thu Aug 06, 2009 3:02 pm Post subject: |
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Hi and thanks so far...
From the mmsystem.h
| Code: | const BYTE MEVT_LONGMSG = 0x80;
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Ok what I did for...
| Code: | | ((unsigned long)MEVT_LONGMSG<<24) | 7 |
was
| Code: | | @binary(byte,7)@binary(byte,0)@binary(byte,0)@binary(byte,$80) |
is that wrong? |
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vdsalchemist
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Joined: 23 Oct 2001
Posts: 1448
Location: Florida, USA
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| Posted: Thu Aug 06, 2009 3:28 pm Post subject: |
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| dmonckton wrote: | Hi and thanks so far...
From the mmsystem.h
| Code: | const BYTE MEVT_LONGMSG = 0x80;
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Ok what I did for...
| Code: | | ((unsigned long)MEVT_LONGMSG<<24) | 7 |
was
| Code: | | @binary(byte,7)@binary(byte,0)@binary(byte,0)@binary(byte,$80) |
is that wrong? |
No this should be correct... If you do the following you will find that the value is $80000007
| Code: |
%b = @binary(byte,7)@binary(byte,0)@binary(byte,0)@binary(byte,$80)
Info @Hex(@Val(%b),8)
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This is the same value that you would get if you do this with the windows calculator in scientific mode and you perform the operations.
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dmonckton
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Joined: 09 Aug 2002
Posts: 117
Location: Lewes, U.K.
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| Posted: Mon Aug 10, 2009 12:20 pm Post subject: |
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Hi
I've finally after months of frustration sent sysex data to my synth. I should be really happy but I'm just p****d o*f its taken me so long. I'll post the solution when I've cleaned it up a bit.
Thanks for all your help.
David.M |
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