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By: Jarmo Pertman
 RE: pointers and whatnot in Win32::API [ reply ]
2010-05-15 19:56
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i'll add some more information in here.
GMEM_FIXED = 0
z = GlobalAlloc(0, x) # x is some large number
d = GlobalLock(z)
...
GetDIBits(_, _, _, _, d, _, _) # _ are just some variables, which are not necessary to show in here
...
# b and c will get declared with Array#pack, so they are just some binary data
# and now this line from the previous post comes with slight modifications due to previous lines and understanding of how DL::PtrData#to_s actually works - i'm using #inspect in here to get also "\\000"-s from the binary:
a = b.inspect + c.inspect # + d
So, as far as I understand then I have to get somehow binary data from memory, which is behind pointer d, right? How can i do it? And if i can, then would this line be correct?
a = b.inspect + c.inspect + d.inspect
Jarmo
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By: Jarmo Pertman
pointers and whatnot in Win32::API [ reply ]
2010-05-15 18:50
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Hello.
I'm trying to convert one Ruby library, which uses Ruby::DL to use Win32::API and i'm in trouble.
I have to use GlobalAlloc and GlobalLock.
Currently they are declared like this in this library:
extern "void* GlobalAlloc(long, long)"
extern "void* GlobalLock(void*)"
And in windows-pr they are like this:
API.new('GlobalAlloc', 'LL', 'L')
API.new('GlobalLock', 'L', 'L')
So, they are returning long instead of pointer.
And now i got a problem when trying to convert this line:
a = b.to_s(10) + c.to_s(26) + d.to_s(22)
where b, c and d are all DL::PtrData
Since b and c were done with Array#pack#to_ptr, then i just removed #to_ptr and converted them like this:
a = b[0..9] + c[0..25]
But the problem is with d, because it is a Fixnum. How could i solve this problem? Should i handle this situation somehow differently and make GlobalLock and GlobalAlloc to return pointers instead?
Jarmo
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